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arXiv 2017年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d’Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Aslanides, E. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Baszczyk, M. Batozskaya, V. Batsukh, B. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.-O. van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Birnkraut, A. Bitadze, A. Bizzeti, A. Blake, T. Blanc, F. Blouw, J. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bonivento, W. Bordyuzhin, I. Borgheresi, A. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Britton, T. Brodzicka, J. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Cadeddu, S. Calabrese, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D.H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Castillo Garcia, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chobanova, V. Chrzaszcz, M. Chubykin, A. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Comerma-Montells, A. Contu, A. Cook, A. Coombs, G. Coquereau, S. Corti, G. Corvo, M. Costa Sobral, C.M. Couturier, B. Cowan, G.A. Craik, D.C. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-Le-Vieux France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France LAL Université Paris-Sud CNRS/IN2P3 Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Sezione INFN di Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell’INFN di Frascati Frascati Italy Sezione INFN di Genova Genova Italy Sezione INFN di Milano Bicocca Milano Italy Sezione INFN di Milano Milano Italy Sezione INFN di Padova Padova Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Roma Italy Sezione INFN di Roma La Sapienza Roma Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switzerland Nikhef National In

A search for the rare decays Bs0 → µ+µ− and B0 → µ+µ− is performed at the LHCb experiment using data collected in pp collisions corresponding to a total integrated luminosity of 4.4 fb−1. An excess of Bs0 → µ+µ− decays is observed with a significance of 7.8 standard deviations, representing the first observation of this decay in a single experiment. The branching fraction is measured to be B(Bs0 → µ+µ−) = (3.0 ± 0.6 +0−0..32) × 10−9, where the first uncertainty is statistical and the second systematic. The first measurement of the Bs0 → µ+µ− effective lifetime, τ(Bs0 → µ+µ−) = 2.04 ± 0.44 ± 0.05 ps, is reported. No significant excess of B0 → µ+µ− decays is found and a 95% confidence level upper limit, B(B0 → µ+µ−) 3.4 × 10−10, is determined. All results are in agreement with the Standard Model expectations. Copyright © 2017, The Authors. All rights reserved.

关键词： Decay (organic)

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Measurement of CP asymmetry in Bs0 → DsK± decays

arXiv

引用

arXiv 2017年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d'Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Aslanides, E. Atzeni, M. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Batozskaya, V. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Beliy, N. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.O. Van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Birnkraut, A. Bizzeti, A. Bjørn, M. Blake, T. Blanc, F. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bordyuzhin, I. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Brodzicka, J. Brundu, D. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calladine, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D.H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chitic, S.-G. Chobanova, V. Chrzaszcz, M. Chubykin, A. Ciambrone, P. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Colombo, T. Comerma-Montells, A. Contu, A. Coombs, G. Coquereau, S. Corti, G. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Universita e INFN Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell'INFN di Frascati Frascati Italy Sezione INFN di Genova Genova Italy Sezione INFN di Milano Bicocca Milano Italy Sezione di Milano Milano Italy Sezione INFN di Padova Padova Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Roma Italy Sezione INFN di Roma La Sapienza Roma Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidade de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switzer

We report the measurements of the CP-violating parameters in Bs0 → DsK± decays observed in pp collisions, using a data set corresponding to an integrated luminosity of 3.0 fb−1 recorded with the LHCb detector. We measure Cf = 0.73 ± 0.14 ± 0.05, A∆Γf = 0.39 ± 0.28 ± 0.15, A∆Γf = 0.31 ± 0.28 ± 0.15, Sf = −0.52 ± 0.20 ± 0.07, Sf = −0.49 ± 0.20 ± 0.07, where the uncertainties are statistical and systematic, respectively. These parameters are used together with the world-average value of the Bs0 mixing phase, −2βs, to obtain a measurement of the CKM angle γ from Bs0 → DsK± decays, yielding γ = (128 +17/−22)◦ modulo 180◦, where the uncertainty contains both statistical and systematic contributions. This corresponds to 3.8 σ evidence for CP violation in the interference between decay and decay after mixing. Copyright © 2017, The Authors. All rights reserved.

关键词： Mixing

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Measurement of the ratio of branching fractions B(Bc+ → J/ψτ+ντ)/B(Bc+ → J/ψµ+νµ)

arXiv

引用

arXiv 2017年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d'Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Aslanides, E. Atzeni, M. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Batozskaya, V. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Beliy, N. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.-O. Van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Birnkraut, A. Bizzeti, A. Bjørn, M. Blake, T. Blanc, F. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bordyuzhin, I. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Britton, T. Brodzicka, J. Brundu, D. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calladine, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D.H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chitic, S.-G. Chobanova, V. Chrzaszcz, M. Chubykin, A. Ciambrone, P. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Colombo, T. Comerma-Montells, A. Contu, A. Cook, A. Coombs, G. Coquereau, S. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-le-Vieux France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Universita e INFN Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell'INFN di Frascati Frascati Italy Sezione INFN di Genova Genova Italy Universita & INFN Milano-Bicocca Milano Italy Sezione di Milano Milano Italy Sezione INFN di Padova Padova Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Roma Italy Sezione INFN di Roma La Sapienza Roma Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switzerland Nik

A measurement is reported of the ratio of branching fractions R(J/ψ) = B(Bc+ → J/ψτ+ντ)/B(Bc+ → J/ψµ+νµ), where the τ+ lepton is identified in the decay mode τ+ → µ+νµντ. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb−1 of integrated luminosity recorded with the LHCb experiment at center-of-mass energies 7 TeV and 8 TeV. A signal is found for the decay Bc+ → J/ψτ+ντ at a significance of 3 standard deviations, corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be R(J/ψ) = 0.71 ± 0.17 (stat) ± 0.18 (syst). This result lies within 2 standard deviations above the range of central values currently predicted from the Standard Model. Copyright © 2017, The Authors. All rights reserved.

关键词： Statistics

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Observation of the decay Λ0b → pK−µ+µ− and a search for CP violation

arXiv

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arXiv 2017年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d’Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Aslanides, E. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Baszczyk, M. Batozskaya, V. Batsukh, B. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Bel, L.J. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Berezhnoy, A. Bernet, R. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.-O. van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Bird, T. Birnkraut, A. Bitadze, A. Bizzeti, A. Blake, T. Blanc, F. Blouw, J. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bonivento, W. Bordyuzhin, I. Borgheresi, A. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Britsch, M. Britton, T. Brodzicka, J. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Cadeddu, S. Calabrese, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D.H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Castillo Garcia, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chobanova, V. Chrzaszcz, M. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Comerma-Montells, A. Contu, A. Cook, A. Coombs, G. Coquereau, S. Corti, G. Corvo, M. Costa Sobral, C.M. Couturier, B. Cowan, G.A. Craik, D.C. Crocombe, A. Cruz Torres, M. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-Le-Vieux France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France LAL Université Paris-Sud CNRS/IN2P3 Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Sezione INFN di Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell’INFN di Frascati Frascati Italy Sezione INFN di Genova Genova Italy Sezione INFN di Milano Bicocca Milano Italy Sezione INFN di Milano Milano Italy Sezione INFN di Padova Padova Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Roma Italy Sezione INFN di Roma La Sapienza Roma Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switzerland Nikhef National In

A search for CP violation in the decay Λ0b → pK−µ+µ− is presented. This decay is mediated by flavour-changing neutral-current transitions in the Standard Model and is potentially sensitive to new sources of CP violation. The study is based on a data sample of proton-proton collisions recorded with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The Λ0b → pK−µ+µ− decay is observed for the first time, and two observables that are sensitive to different manifestations of CP violation are measured, ∆ACP ≡ ACP(Λ0b → pK−µ+µ−) − ACP(Λ0b → pK−J/ψ) and aTCPb-odd, where the latter is based on asymmetries in the angle between the µ+µ− and pK− decay planes. These are measured to be ∆ACP = (−3.5 ± 5.0 (stat) ± 0.2 (syst)) × 10−2, aTCPb-odd = (1.2 ± 5.0 (stat) ± 0.7 (syst)) × 10−2, and no evidence for CP violation is found. Copyright © 2017, The Authors. All rights reserved.

关键词： Supersymmetry

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Study of charmonium production in b-hadron decays and first evidence for the decay Bs0 → φφφ

arXiv

引用

arXiv 2017年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d'Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Aslanides, E. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Baszczyk, M. Batozskaya, V. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.-O. van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Birnkraut, A. Bitadze, A. Bizzeti, A. Blake, T. Blanc, F. Blouw, J. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bonivento, W. Bordyuzhin, I. Borgheresi, A. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Britton, T. Brodzicka, J. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Cadeddu, S. Calabrese, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D.H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Castillo Garcia, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Charles, M. Charpentier, P.H. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chobanova, V. Chrzaszcz, M. Chubykin, A. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Comerma-Montells, A. Contu, A. Cook, A. Coombs, G. Coquereau, S. Corti, G. Corvo, M. Costa Sobral, C.M. Couturier, B. Cowan, G.A. Craik, D.C. Crocombe, A. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-Le-Vieux France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France LAL Université Paris-Sud CNRS/IN2P3 Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Universita e INFN Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell'INFN di Frascati Frascati Italy Sezione INFN di Genova Genova Italy Universita & INFN Milano-Bicocca Milano Italy Sezione di Milano Milano Italy Sezione INFN di Padova Padova Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Roma Italy Sezione INFN di Roma La Sapienza Roma Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switzerland Nikhef National I

Using decays to φ-meson pairs, the inclusive production of charmonium states in b-hadron decays is studied with pp collision data corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment at centreof-mass energies of 7 and 8 TeV. Denoting by BC ≡ B(b → CX) × B(C → φφ) the inclusive branching fraction of a b hadron to a charmonium state C that decays into a pair of φ mesons, ratios RCC21 ≡ BC1/BC2 are determined as Rηχcc(10S) = 0.147 ± 0.023 ± 0.011, Rηχcc(11S) = 0.073 ± 0.016 ± 0.006, Rηχcc(12S) = 0.081 ± 0.013 ± 0.005, Rχχcc01 = 0.50 ± 0.11 ± 0.01, Rχχcc02 = 0.56±0.10±0.01 and Rηηcc(1(2SS)) = 0.040 ± 0.011 ± 0.004. Here and below the first uncertainties are statistical and the second systematic. Upper limits at 90% confidence level for the inclusive production of X(3872), X(3915) and χc2(2P) states are obtained as RχXc(3872)1 χXc(3915)0 χχcc22(2P) c(1S) and χc states. The branching fraction of the decay Bs0 → φφφ is measured for the first time, B(Bs0 → φφφ) = (2.15 ± 0.54 ± 0.28 ± 0.21B) × 10−6. Here the third uncertainty is due to the branching fraction of the decay Bs0 → φφ, which is used for normalization. No evidence for intermediate resonances is seen. A preferentially transverse φ polarization is observed. The measurements allow the determination of the ratio of the branching fractions for the ηc(1S) decays to φφ and pp as B(ηc(1S)→ φφ)/B(ηc(1S)→ pp) = 1.79 ± 0.14 ± 0.32. Copyright © 2017, The Authors. All rights reserved.

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Updated branching fraction measurements of B(0s) → KS0h+h0− decays

arXiv

引用

arXiv 2017年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d'Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Aslanides, E. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Baszczyk, M. Batozskaya, V. Batsukh, B. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.-O. van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Birnkraut, A. Bitadze, A. Bizzeti, A. Blake, T. Blanc, F. Blouw, J. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bonivento, W. Bordyuzhin, I. Borgheresi, A. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Britton, T. Brodzicka, J. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Cadeddu, S. Calabrese, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D.H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Castillo Garcia, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chobanova, V. Chrzaszcz, M. Chubykin, A. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Comerma-Montells, A. Contu, A. Cook, A. Coombs, G. Coquereau, S. Corti, G. Corvo, M. Costa Sobral, C.M. Couturier, B. Cowan, G.A. Craik, D.C. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-Le-Vieux France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France LAL Université Paris-Sud CNRS/IN2P3 Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Sezione INFN di Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell'INFN di Frascati Frascati Italy Sezione INFN di Genova Genova Italy Sezione INFN di Milano Bicocca Milano Italy Sezione INFN di Milano Milano Italy Sezione INFN di Padova Padova Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Roma Italy Sezione INFN di Roma La Sapienza Roma Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switzerland Nikhef National I

The charmless three-body decays B(0s) → KS0h+h0− (where h(0) = π, K) are analysed using a sample of pp collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The branching fractions are measured relative to that of the B0 → KS0π+π− decay, and are determined to be: BB ( (BB00→→KKS0S0Kπ+±ππ−) ) = 0.123 ± 0.009 (stat) ± 0.015 (syst), BB ( (BB00→→KKS0S0Kπ++Kπ−−) ) = 0.549 ± 0.018 (stat) ± 0.033 (syst), BB ( (BBs00→→KKSS00ππ++ππ−− ) ) = 0.191 ± 0.027 (stat) ± 0.031 (syst) ± 0.011 (fs/fd), BB ( (BBs00→→KKS0S0Kπ+±ππ−) ) = 1.70 ± 0.07 (stat) ± 0.11 (syst) ± 0.10 (fs/fd), BB ((BBs00→→KKS0S0Kπ++Kπ−−) ) ∈ [0.008 − 0.051] at 90% confidence level, where fs/fd represents the ratio of hadronisation fractions of the Bs0 and B0 mesons. Copyright © 2017, The Authors. All rights reserved.

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Measurement of branching fractions of charmless four-body Λ0b and Ξb0 decays

arXiv

引用

arXiv 2017年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d'Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Aslanides, E. Atzeni, M. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Batozskaya, V. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Beliy, N. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.-O. Van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Birnkraut, A. Bizzeti, A. Bjørn, M. Blake, T. Blanc, F. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bordyuzhin, I. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Britton, T. Brodzicka, J. Brundu, D. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calladine, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D.H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chitic, S.-G. Chobanova, V. Chrzaszcz, M. Chubykin, A. Ciambrone, P. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Colombo, T. Comerma-Montells, A. Contu, A. Cook, A. Coombs, G. Coquereau, S. Corti, G. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-le-Vieux France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France LAL Université Paris-Sud CNRS/IN2P3 Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Universita e INFN Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell'INFN di Frascati Frascati Italy Sezione INFN di Genova Genova Italy Universita & INFN Milano-Bicocca Milano Italy Sezione di Milano Milano Italy Sezione INFN di Padova Padova Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Roma Italy Sezione INFN di Roma La Sapienza Roma Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switzerland Nikhef National Institu

A search for charmless four-body decays of Λ0b and Ξb0 baryons with a proton and three charged mesons (either kaons or pions) in the final state is performed. The data sample used was recorded in 2011 and 2012 with the LHCb experiment and corresponds to an integrated luminosity of 3 fb−1. Six decay modes are observed, among which Λ0b → pK−π+π−, Λ0b → pK−K+K−, Ξb0 → pK−π+π− and Ξb0 → pK−π+K− are established for the first time. Their branching fractions (including the ratio of hadronisation fractions in the case of the Ξb0 baryon) are determined relative to the Λ0b → Λ+c π− decay. Copyright © 2017, The Authors. All rights reserved.

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Measurement of the ratio of the B0 ∗ D0→+τ∗ and B0 → D0μ-+τμ branching fractions using three-prong ∗-lepton decays

arXiv

引用

arXiv 2017年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Alfonso Albero, A. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d'Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Aslanides, E. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Batozskaya, V. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Beliy, N. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.-O. van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Birnkraut, A. Bitadze, A. Bizzeti, A. Bjørn, M. Blake, T. Blanc, F. Blouw, J. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bonivento, W. Bordyuzhin, I. Borgheresi, A. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Britton, T. Brodzicka, J. Brundu, D. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calladine, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D.H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Castillo Garcia, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chitic, S.-G. Chobanova, V. Chrzaszcz, M. Chubykin, A. Ciambrone, P. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Colombo, T. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-Le-Vieux France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France LAL Université Paris-Sud CNRS/IN2P3 Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Universita e INFN Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell'INFN di Frascati Frascati Italy Sezione INFN di Genova Genova Italy Universita & INFN Milano-Bicocca Milano Italy Sezione di Milano Milano Italy Sezione INFN di Padova Padova Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Roma Italy Sezione INFN di Roma La Sapienza Roma Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switzerland Nikhef National Institu

The ratio of branching fractions R(D∗-) = B(B0 D∗-t+t)/B(B0 D∗-μ+μ) is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb-1. For the first time R(D∗-) is determined using the t lepton decays with three charged pions in the final state. The B0 D∗-t+t yield is normalized to that of the B0 D∗-p+p-p+ mode, providing a measurement of B(B0 D∗-t+t)/B(B0 D∗-p+p-p+) = 1.97 ± 0.13 ± 0.18, where the first uncertainty is statistical and the second systematic. The value of B(B0 D∗-t+t) = (1.42±0.094±0.129±0.054)% is obtained, where the third uncertainty is due to the limited knowledge of the branching fraction of the normalization mode. Using the well-measured branching fraction of the B0 D∗-μ+μ decay, a value of R(D∗-) = 0.291 ± 0.019 ± 0.026 ± 0.013 is established, where the third uncertainty is due to the limited knowledge of the branching fractions of the normalization and B0 D∗-μ+μ modes. This measurement is in agreement with the Standard Model prediction and with previous results. Copyright © 2017, The Authors. All rights reserved.

关键词： Uncertainty analysis

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Measurement of B0, Bs0, B+ and Λ0b production asymmetries in 7 and 8 TeV proton-proton collisions

arXiv

引用

arXiv 2017年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Ali, S. Alkhazov, G. Alvarez Cartelle, P. Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d'Argent, P. Arnau Romeu, J. Artamonov, A. Artuso, M. Aslanides, E. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Baszczyk, M. Batozskaya, V. Batsukh, B. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Berezhnoy, A. Bernet, R. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.-O. van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Bird, T. Birnkraut, A. Bitadze, A. Bizzeti, A. Blake, T. Blanc, F. Blouw, J. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bonivento, W. Bordyuzhin, I. Borgheresi, A. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Britsch, M. Britton, T. Brodzicka, J. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Cadeddu, S. Calabrese, R. Calvi, M. Calvo Gomez, M. Camboni, A. Campana, P. Campora Perez, D.H. Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Carvalho Akiba, K. Casse, G. Cassina, L. Castillo Garcia, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chobanova, V. Chrzaszcz, M. Cid Vidal, X. Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Comerma-Montells, A. Contu, A. Cook, A. Coombs, G. Coquereau, S. Corti, G. Corvo, M. Costa Sobral, C.M. Couturier, B. Cowan, G.A. Craik, D.C. Crocombe, A. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China LAPP Université Savoie Mont-Blanc CNRS/IN2P3 Annecy-Le-Vieux France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France CPPM Aix-Marseille Université CNRS/IN2P3 Marseille France LAL Université Paris-Sud CNRS/IN2P3 Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Sezione INFN di Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell'INFN di Frascati Frascati Italy Sezione INFN di Genova Genova Italy Sezione INFN di Milano Bicocca Milano Italy Sezione INFN di Milano Milano Italy Sezione INFN di Padova Padova Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Roma Italy Sezione INFN di Roma La Sapienza Roma Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidad de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switzerland Nikhef National In

The B0, Bs0, B+ and Λ0b hadron production asymmetries are measured using a data sample corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. The measurements are performed as a function of transverse momentum and rapidity of the b hadrons within the LHCb detector acceptance. The overall production asymmetries, integrated over transverse momentum and rapidity, are also determined. Copyright © 2017, The Authors. All rights reserved.

关键词： Tellurium compounds

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Search for excited Bc+ states

arXiv

引用

arXiv 2017年

作者： Aaij, R. Adeva, B. Adinolfi, M. Ajaltouni, Z. Akar, S. Albrecht, J. Alessio, F. Alexander, M. Albero, A. Alfonso Ali, S. Alkhazov, G. Cartelle, P. Alvarez Alves, A.A. Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. d’Argent, P. Romeu, J. Arnau Artamonov, A. Artuso, M. Aslanides, E. Atzeni, M. Auriemma, G. Baalouch, M. Babuschkin, I. Bachmann, S. Back, J.J. Badalov, A. Baesso, C. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barschel, C. Barsuk, S. Barter, W. Baryshnikov, F. Batozskaya, V. Battista, V. Bay, A. Beaucourt, L. Beddow, J. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Beliy, N. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Ben-Haim, E. Bencivenni, G. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.O. van Beuzekom, M. Bezshyiko, Ia. Bifani, S. Billoir, P. Birnkraut, A. Bizzeti, A. Bjørn, M. Blake, T. Blanc, F. Blusk, S. Bocci, V. Boettcher, T. Bondar, A. Bondar, N. Bordyuzhin, I. Borghi, S. Borisyak, M. Borsato, M. Bossu, F. Boubdir, M. Bowcock, T.J.V. Bowen, E. Bozzi, C. Braun, S. Brodzicka, J. Brundu, D. Buchanan, E. Burr, C. Bursche, A. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calladine, R. Calvi, M. Gomez, M. Calvo Camboni, A. Campana, P. Perez, D.H. Campora Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Carson, L. Akiba, K. Carvalho Casse, G. Cassina, L. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Chapman, M.G. Charles, M. Charpentier, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. Chitic, S.-G. Chobanova, V. Chrzaszcz, M. Chubykin, A. Ciambrone, P. Vidal, X. Cid Ciezarek, G. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Colombo, T. Comerma-Montells, A. Contu, A. Coombs, G. Coquereau, S. Corti, G. Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Clermont Université Université Blaise Pascal CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France LPNHE Université Pierre et Marie Curie Université Paris Diderot CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland Sezione INFN di Bari Bari Italy Sezione INFN di Bologna Bologna Italy Sezione INFN di Cagliari Cagliari Italy Universita e INFN Ferrara Ferrara Italy Sezione INFN di Firenze Firenze Italy Laboratori Nazionali dell’INFN di Frascati Frascati Italy Sezione INFN di Genova Genova Italy Sezione INFN di Milano Bicocca Milano Italy Sezione di Milano Milano Italy Sezione INFN di Padova Padova Italy Sezione INFN di Pisa Pisa Italy Sezione INFN di Roma Tor Vergata Roma Italy Sezione INFN di Roma La Sapienza Roma Italy Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences Kraków Poland AGH - University of Science and Technology Faculty of Physics and Applied Computer Science Kraków Poland Warsaw Poland Horia Hulubei National Institute of Physics and Nuclear Engineering Bucharest-Magurele Romania Gatchina Russia Moscow Russia Moscow Russia Moscow Russia Yandex School of Data Analysis Moscow Russia Novosibirsk Russia Protvino Russia ICCUB Universitat de Barcelona Barcelona Spain Universidade de Santiago de Compostela Santiago de Compostela Spain Geneva Switzerland Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switze

A search is performed in the invariant mass spectrum of the Bc+π+π− system for the excited Bc+ states Bc(21S0)+ and Bc(23S1)+ using a data sample of pp collisions collected by the LHCb experiment at the centre-of-mass energy of √s = 8 TeV, corresponding to an integrated luminosity of 2 fb−1. No evidence is seen for either state. Upper limits on the ratios of the production cross-sections of the Bc(21S0)+ and Bc(23S1)+ states times the branching fractions of Bc(21S0)+ → Bc+π+π− and Bc(23S1)+ → Bc∗+π+π− over the production cross-section of the Bc+ state are given as a function of their masses. They are found to be between 0.02 and 0.14 at 95% confidence level for Bc(21S0)+ and Bc(23S1)+ in the mass ranges [6830, 6890] MeV/c2 and [6795, 6890] MeV/c2, respectively. Copyright © 2017, The Authors. All rights reserved.

关键词： Mass spectrometry

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