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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 → τ+τ− and B0 → τ+τ− is performed using proton–proton collision data collected with the LHCb detector. The data sample corresponds to an integrated luminosity of 3 fb−1 collected in 2011 and 2012. The τ leptons are reconstructed through the decay τ− → π−π+π−ντ. Assuming no contribution from B0 → τ+τ− decays, an upper limit is set on the branching fraction B(Bs0 → τ+τ−) −3 at 95% confidence level. If instead no contribution from Bs0 → τ+τ− decays is assumed, the limit is B(B0 → τ+τ−) −3 at 95% confidence level. These results correspond to the first direct limit on B(Bs0 → τ+τ−) and the world’s best limit on B(B0 → τ+τ−). Copyright © 2017, The Authors. All rights reserved.

关键词： Decay (organic)

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Measurement of the CP violation parameter AΓ in D0 → K+K− and D0 → π+π− 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. 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. 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. 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. 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

Asymmetries in the time-dependent rates of D0 → K+K− and D0 → π+π− decays are measured in a pp collision data sample collected with the LHCb detector during LHC Run 1, corresponding to an integrated luminosity of 3 fb−1. The asymmetries in effective decay widths between D0 and D0 decays, sensitive to indirect CP violation, are measured to be AΓ(K+K−) = (−0.30 ± 0.32 ± 0.10) × 10−3 and AΓ(π+π−) = (0.46 ± 0.58 ± 0.12) × 10−3, where the first uncertainty is statistical and the second systematic. These measurements show no evidence for CP violation and improve on the precision of the previous best measurements by nearly a factor of two. Copyright © 2017, The Authors. All rights reserved.

关键词： Supersymmetry

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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 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 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.

关键词： Hadrons

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Measurement of CP observables in B±→ DK∗± decays using two- and four-body D final 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. 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. 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. 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. 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

Measurements of CP observables in B± → DK∗± decays are presented, where D denotes a superposition of D0 and D0 meson states. Decays of the D meson to K−π+, K−K+, π−π+, K−π+π−π+ and π−π+π−π+ are used and the K∗± meson is reconstructed in the KS0π± final state. This analysis uses a data sample of pp collisions collected with the LHCb experiment, corresponding to integrated luminosities of 1 fb−1, 2 fb−1 and 1.8 fb−1 at centre-of-mass energies √s = 7 TeV, 8 TeV and 13 TeV, respectively. The sensitivity of the results to the CKM angle γ is discussed. Copyright © 2017, The Authors. All rights reserved.

关键词： Bosons

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Measurement of the Υ(nS) polarizations in pp collisions at √s = 7 and 8 TeV

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. 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. Cogan, J. Cogneras, E. Cogoni, V. Cojocariu, L. Collins, P. Colombo, T. Comerma-Montells, 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 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 polarization of the Υ(1S), Υ(2S) and Υ(3S) mesons, produced in pp collisions at centre-of-mass energies √s = 7 and 8 TeV, is measured using data samples collected by the LHCb experiment, corresponding to integrated luminosities of 1 and 2 fb−1, respectively. The measurements are performed in three polarization frames, using Υ → µ+µ− decays in the kinematic region of the transverse momentum pΥT Υ Copyright © 2017, The Authors. All rights reserved.

关键词： Polarization

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Resonances and CP violation in Bs0 and B0s → J/ψK+K− decays in the mass region above the φ(1020)

arXiv

引用

arXiv 2017年

作者： LHCb collaboration 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. 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 decays of Bs0 and B0s mesons into the J/ψK+K− final state are studied in the K+K− mass region above the φ(1020) meson in order to determine the resonant substructure and measure the CP-violating phase, φs, the decay width, Γs, and the width difference between light and heavy mass eigenstates, ∆Γs. A decay-time dependent amplitude analysis is employed. The data sample corresponds to an integrated luminosity of 3 fb−1 produced in 7 and 8 TeV pp collisions at the LHC, collected by the LHCb experiment. The measurement determines φs = 119 ± 107 ± 34 mrad. A combination with previous LHCb measurements using similar decays into the J/ψπ+π− and J/ψφ(1020) final states gives φs = 1±37 mrad, consistent with the Standard Model prediction. Copyright © 2017, The Authors. All rights reserved.

关键词： Hadrons

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Updated search for long-lived particles decaying to jet pairs

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

A search is presented for long-lived particles with a mass between 25 and 50 GeV/c2 and a lifetime between 2 and 500 ps, using proton-proton collision data corresponding to an integrated luminosity of 2.0 fb−1, collected by the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The particles are assumed to be pair-produced in the decay of a 125 GeV/c2 Standard-Model-like Higgs boson. The experimental signature is a single long-lived particle, identified by a displaced vertex with two associated jets. No excess above background is observed and limits are set on the production cross-section as a function of the mass and lifetime of the long-lived particle. Copyright © 2017, The Authors. All rights reserved.

关键词： Germanium alloys

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Measurement of the Bs0 → µ+µ− branching fraction and effective lifetime and search for B0 → µ+µ− 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 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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