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34th International Cosmic Ray Conference, ICRC 2015

作者： Martucci, M. Bazilevskaya, G.A. Boezio, M. Bravar, U. Bruno, A. Christian, E.R. De Nolfo, G.A. Lee, M. Mergè, M. Mocchiutti, E. Munini, R. Ricci, M. Ryan, J.M. Stochaj, S. Thakur, N. Adriani, O. Barbarino, G.C. Bellotti, R. Bogomolov, E.A. Bongi, M. Bonvicini, V. Bottai, S. Cafagna, F. Campana, D. Carlson, P. Casolino, M. Castellini, G. De Donato, C. De Santis, C. De Simone, N. Di Felice, V. Formato, V. Galper, A.M. Karelin, A.V. Koldashov, S.V. Koldobskiy, S. Krutkov, S.Y. Kvashnin, A.N. Leonov, A. Malakhov, V. Marcelli, L. Mayorov, A.G. Menn, W. Mikhailov, V.V. Monaco, A. Mori, N. Osteria, G. Palma, F. Panico, B. Papini, P. Pearce, M. Picozza, P. Ricciarini, S.B. Sarkar, R. Scotti, V. Simon, M. Sparvoli, R. Spillantini, P. Stozhkov, Y.I. Vacchi, A. Vannuccini, E. Vasilyev, G. Voronov, S.A. Yurkin, Y.T. Zampa, G. Zampa, N. Department of Physics University of Rome 'Tor Vergata' RomeI-00133 Italy INFN Laboratori Nazionali di Frascati Via Enrico Fermi 40 FrascatiI-00044 Italy Lebedev Physical Institute MoscowRU-119991 Russia INFN Sezione di Trieste TriesteI-34149 Italy Space Science Center University of New Hampshire DurhamNH United States University of Bari BariI-70126 Italy Heliophysics Division NASA Goddard Space Flight Center GreenbeltMD United States INFN Sezione di Rome 'Tor Vergata' RomeI-00133 Italy University of Trieste Department of Physics TriesteI-34147 Italy Electrical and Computer Engineering New Mexico State University Las CrucesNM United States University of Florence Department of Physics Sesto Fiorentino FlorenceI-50019 Italy INFN Sezione di Florence Sesto Fiorentino FlorenceI-50019 Italy University of Naples IJFederico Iì i Department of Physics NaplesI-80126 Italy INFN Sezione di Naples NaplesI-80126 Italy Moscow RU-119991 Russia INFN Sezione di Bari BariI-70126 Italy Ioffe Physical Technical Institute St.-PetersburgRU-194021 Russia National Research Nuclear University MEPhI MoscowRU-115409 Russia KTH Department of Physics Oskar Klein Centre for Cosmoparticle Physics StockholmSE-10691 Sweden RIKEN Advanced Science Institute Wako-shi Saitama Japan 1IFAC Sesto Fiorentino FlorenceI-50019 Italy Universitat Siegen Department of Physics SiegenD-57068 Germany Science Data Center FrascatiI-00044 Italy Viale A. Doria 6 CataniaI-95125 Italy INFN Sezione di Perugia PerugiaI-06123 Italy Indian Centre for Space Physics Garia Station Road Kolkata West Bengal700084 India

The great challenge in constraining scenarios for solar energetic particle (SEP) acceleration is due to the fact that the signatures of acceleration itself are heavily modified by transport within interplanetary space. During transport, SEPs are subject to pitch angle scattering by the turbulent magnetic field, adiabatic focusing, or reflecting magnetic structures. Ground Level Enhancements (GLEs) provide an ideal way to study acceleration with minimal transport. In this work, we present a unique high-energy SEP observation from PAMELA of the 2012 May 17 GLE and interpret the observed pitch angle distributions as a result of local scattering (1 AU) by the Earth's magnetosheath.

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Measurement of Bs0 and Ds− meson lifetimes

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

We report on a measurement of the flavor-specific Bs0 lifetime and of the Ds− lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0 fb−1 of integrated luminosity. Approximately 407 000 Bs0 → Ds(∗)−µ+νµ decays are partially reconstructed in the K+K−π−µ+ final state. The Bs0 and Ds− natural widths are determined using, as a reference, kinematically similar B0 → D(∗)−µ+νµ decays reconstructed in the same final state. The resulting differences between widths of Bs0 and B0 mesons and of Ds− and D− mesons are ∆Γ(B) = −0.0115 ± 0.0053 (stat) ± 0.0041 (syst) ps−1 and ∆Γ(D) = 1.0131 ± 0.0117 (stat) ± 0.0065 (syst) ps−1, respectively. Combined with the known B0 and D− lifetimes, these yield the flavor-specific Bs0 lifetime, τBfs0 = 1.547 ± 0.013 (stat) ± 0.010 (syst) ± 0.004 (τB ) ps and the Ds− lifetime, τDs− = s 0.5064±0.0030 (stat)±0.0017 (syst)±0.0017 (τD ) ps. The last uncertainties originate from the limited knowledge of the B0 and D− lifetimes. The results improve upon current determinations. Copyright © 2017, The Authors. All rights reserved.

关键词： Bosons

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Study of J/ψ production in jets

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. Cartelle, P. Alvarez Jr, A.A. Alves Amato, S. Amerio, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Appleby, R.B. Archilli, F. Argent, P. Romeu, J. Arnau 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. 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. 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. Garcia, L. Castillo 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. 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. Collazuol, G. Collins, P. Comerma-Montells, A. Contu, A. Cook, A. Coombs, G. Coquereau, S. Corti, G. Corvo, M. Sobral, C.M. Costa 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 production of J/ψ mesons in jets is studied in the forward region of protonproton collisions using data collected with the LHCb detector at a center-of-mass energy of 13 TeV. The fraction of the jet transverse momentum carried by the J/ψ meson, z(J/ψ) ≡ pT(J/ψ)/pT(jet), is measured using jets with pT(jet) > 20 GeV in the pseudorapidity range 2.5 T fraction carried by prompt J/ψ mesons in jets at any experiment. Copyright © 2017, The Authors. All rights reserved.

关键词： Hadrons

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Observation of the decay Bs0 → ηcφ and evidence for Bs0 → ηcπ+π−

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. 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. 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 study of Bs0 → ηcφ and Bs0 → ηcπ+π− decays is performed using pp collision data corresponding to an integrated luminosity of 3.0 fb−1, collected with the LHCb detector in Run 1 of the LHC. The observation of the decay Bs0 → ηcφ is reported, where the ηc meson is reconstructed in the pp¯, K+K−π+π−, π+π−π+π− and K+K−K+K− decay modes and the φ(1020) in the K+K− decay mode. The decay Bs0 → J/ψφ is used as a normalisation channel. Evidence is also reported for the decay Bs0 → ηcπ+π−, where the ηc meson is reconstructed in the pp¯ decay mode, using the decay Bs0 → J/ψπ+π− as a normalisation channel. The measured branching fractions are B(Bs0 → ηcφ) = (5.01 ± 0.53 ± 0.27 ± 0.63) × 10−4 , B(Bs0 → ηcπ+π−) = (1.76 ± 0.59 ± 0.12 ± 0.29) × 10−4 , where in each case the first uncertainty is statistical, the second systematic and the third uncertainty is due to the limited knowledge of the external branching fractions. Copyright © 2017, The Authors. All rights reserved.

关键词： Hadrons

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Observation of five new narrow Ωc0 states decaying to Ξc+K−

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

The Ξc+K− mass spectrum is studied with a sample of pp collision data corresponding to an integrated luminosity of 3.3 fb−1, collected by the LHCb experiment. The Ξc+ is reconstructed in the decay mode pK−π+. Five new, narrow excited Ωc0 states are observed: the Ωc(3000)0, Ωc(3050)0, Ωc(3066)0, Ωc(3090)0, and Ωc(3119)0. Measurements of their masses and widths are reported. Copyright © 2017, The Authors. All rights reserved.

关键词： Mass spectrometry

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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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Measurement of the B± production asymmetry and the CP asymmetry in B± → J/ψK± 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. 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. 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. 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. Garcia, L. Castillo 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. 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. Collazuol, G. Collins, P. Comerma-Montells, A. Contu, A. Cook, A. Coombs, G. Coquereau, S. Corti, G. Corvo, M. Sobral, C.M. Costa 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 B± meson production asymmetry in pp collisions is measured using B+ → D0π+ decays. The data were recorded by the LHCb experiment during Run 1 of the LHC at centre-of-mass energies of √s = 7 and 8 TeV. The production asymmetries, integrated over transverse momenta in the range 2 T prod(B+, √s = 7 TeV) = (−0.41 ± 0.49 ± 0.10) × 10−2, Aprod(B+, √s = 8 TeV) = (−0.53 ± 0.31 ± 0.10) × 10−2, where the first uncertainties are statistical and the second are systematic. These production asymmetries are used to correct the raw asymmetries of B+ → J/ψK+ decays, thus allowing a measurement of the CP asymmetry, ACP(B+ → J/ψK+) = (0.09 ± 0.27 ± 0.07) × 10−2. Copyright © 2017, The Authors. All rights reserved.

关键词： Tellurium compounds

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Observation of the decays Λ0b → χc1pK− and Λ0b → χc2pK−

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, 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. 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 first observation of the decays Λ0b → χc1pK− and Λ0b → χc2pK− is reported using a data sample corresponding to an integrated luminosity of 3.0 fb−1, collected by the LHCb experiment in pp collisions at centre-of-mass energies of 7 and 8 TeV. The following ratios of branching fractions are measured BB((ΛΛ0b0b→→J/ψpKχc1pK−−)) = 0.242 ± 0.014 ± 0.013 ± 0.009, BB((ΛΛ0b0b→→J/ψpKχc2pK−−)) = 0.248 ± 0.020 ± 0.014 ± 0.009, BB((ΛΛ0b0b→→χχcc21pKpK−−)) = 1.02 ± 0.10 ± 0.02 ± 0.05, where the first uncertainty is statistical, the second systematic and the third due to the uncertainty on the branching fractions of the χc1 → J/ψγ and χc2 → J/ψγ decays. Using both decay modes, the mass of the Λ0b baryon is also measured to be mΛ0b = 5619.44 ± 0.28 ± 0.26 MeV/c2, where the first and second uncertainties are statistical and systematic, respectively. Copyright © 2017, The Authors. All rights reserved.

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Improved limit on the branching fraction of the rare decay KS0 → µ+µ−

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. 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, Ph. Chatzikonstantinidis, G. Chefdeville, M. Chen, S. Cheung, S.F. 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. 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 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 the decay KS0 → µ+µ− is performed, based on a data sample of proton-proton collisions corresponding to an integrated luminosity of 3 fb−1, collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The observed yield is consistent with the background-only hypothesis, yielding a limit on the branching fraction of B(KS0 → µ+µ−) 0.8 (1.0) × 10−9 at 90% (95%) confidence level. This result improves the previous upper limit on the branching fraction by an order of magnitude. Copyright © 2017, The Authors. All rights reserved.

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Search for the decays Bs0 → τ+τ− and B0 → τ+τ−

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 → 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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