Measurement of the mass difference between neutral charm-meson eigenstates

作     者：Aaij, R. Beteta, C. Abellán Adeva, B. Adinolfi, M. Aidala, C.A. Ajaltouni, Z. Akar, S. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Albero, A. Alfonso Alkhazov, G. Cartelle, P. Alvarez Jr, A.A. Alves Amato, S. Amhis, Y. An, L. Anderlini, L. Andreassi, G. Andreotti, M. Andrews, J.E. Archilli, F. Romeu, J. Arnau Artamonov, A. Artuso, M. Arzymatov, K. Aslanides, E. Atzeni, M. Audurier, B. Bachmann, S. Back, J.J. Baker, S. Balagura, V. Baldini, W. Baranov, A. Barlow, R.J. Barrand, G.C. Barsuk, S. Barter, W. Bartolini, M. Baryshnikov, F. Batozskaya, V. Batsukh, B. Battig, A. Battista, V. Bay, A. Bedeschi, F. Bediaga, I. Beiter, A. Bel, L.J. Belin, S. Beliy, N. Bellee, V. Belloli, N. Belous, K. Belyaev, I. Bencivenni, G. Ben-Haim, E. Benson, S. Beranek, S. Berezhnoy, A. Bernet, R. Berninghoff, D. Bertholet, E. Bertolin, A. Betancourt, C. Betti, F. Bettler, M.O. Bezshyiko, I. Bhasin, S. Bhom, J. Bieker, M.S. Bifani, S. Billoir, P. Birnkraut, A. Bizzeti, A. Bjørn, M. Blago, M.P. Blake, T. Blanc, F. Blusk, S. Bobulska, D. Bocci, V. Garcia, O. Boente Boettcher, T. Bondar, A. Bondar, N. Borghi, S. Borisyak, M. Borsato, M. Boubdir, M. Bowcock, T.J.V. Bozzi, C. Braun, S. Brodski, M. Brodzicka, J. Gonzalo, A. Brossa Brundu, D. Buchanan, E. Buonaura, A. Burr, C. Bursche, A. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calladine, R. Calvi, M. Gomez, M. Calvo Camboni, A. Campana, P. Perez, D.H. Campora Capriotti, L. Carbone, A. Carboni, G. Cardinale, R. Cardini, A. Carniti, P. Akiba, K. Carvalho Casse, G. Cattaneo, M. Cavallero, G. Cenci, R. Chamont, D. Chapman, M.G. Charles, M. Charpentier, P. Chatzikonstantinidis, G. Chefdeville, M. Chekalina, V. Chen, C. Chen, S. Chitic, S.-G. Chobanova, V. Chrzaszcz, M. Chubykin, A. Ciambrone, P. Vidal, X. Cid Ciezarek, G. Cindolo, F. Clarke, P.E.L. Clemencic, M. Cliff, H.V. Closier, J. Coco, V. Coelho, J.A.B. Cogan, J. Cogneras, E. Cojocariu, L. Collins, P. Colombo, T. Comerma-Montells, A. Contu, A. 

作者机构： Rio de Janeiro Brazil  Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China University of Chinese Academy of Sciences Beijing China  Beijing China Univ. Grenoble Alpes Univ. Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité 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 INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Milano Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma Tor Vergata Roma Italy INFN Sezione di Roma La Sapienza Roma Italy Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Subatomic Physics VU University Amsterdam Amsterdam Netherlands 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  Moscow Russia  Moscow Russia  Moscow Russia Yandex School of Data Analysis Moscow Russia  Novosibirsk Russia  Protvino Russia Konstantinov Nuclear Physics Institute of National Research Centre Kurchatov Institute" PNPI St.Petersburg Russia ICCUB Universitat de Barcelona Barcelona Spain  Universidade de Santiago de Compostela Santiago de Compostela Spain  Geneva Switzerland  Lausanne Switzerland Physik-Institut Universität Zürich Zürich Switzerland  Kharkiv Ukraine  Kyiv Ukraine University of Birmingham Birmingham United Kingdom H.H. Wills Physics Laboratory University of Bristol Bristol United Kingdom Cavendish Laboratory University of Cambridge Cambridge United Kingdom Department of Physics University of Warwick Coventry United Kingdom STFC Rutherford Appleton Laboratory Didcot United Kingdom School of Physics and Astronomy University of Edinburgh Edinburgh United Kingdom School of Physics and Astronomy University of Glasgow Glasgow United Kingdom Oliver Lodge Laboratory University of Liverpool Liverpool United Kingdom Imperial College London London United Kingdom School of Physics and Astronomy University of Manchester Manchester United Kingdom Department of Physics University of Oxford Oxford United Kingdom Massachusetts Institute of Technology CambridgeMA United States University of Cincinnati CincinnatiOH United States University of Maryland College ParkMD United States Syracuse University SyracuseNY United States Laboratory of Mathematical and Subatomic Physics Constantine Algeria  Rio de Janeiro Brazil South China Normal University Guangzhou China School of Physics and Technology Wuhan University Wuhan China Institute of Particle Physics Central China Normal University Wuhan Hubei China Departamento de Fisica Universidad Nacional de Colombia Bogota Colombia Institut für Physik Universität Rostock Rostock Germany Van Swinderen Institute University of Groningen Groningen Netherlands National Research Centre Kurchatov Institute Moscow Russia National University of Science and Technology "MISIS" Moscow Russia National Research University Higher School of Economics Moscow Russia National Research Tomsk Polytechnic University Tomsk Russia Instituto de Fisica Corpuscular Centro Mixto Universidad de Valencia - CSIC Valencia Spain University of Michigan Ann Arbor United States  Los Alamos United States  Uberaba-MG Brazil Laboratoire Leprince-Ringuet Palaiseau France  Moscow Russia Università di Bari Bari Italy Università di Bologna Bologna Italy Università di Cagliari Cagliari Italy gUniversità di Ferrara Ferrara Italy 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2019年

核心收录：

主　　题：Hadrons 

摘      要：We report a measurement of the mass difference between neutral charm-meson eigenstates using a novel approach that enhances sensitivity to this parameter. We use 2.3 × 106 D0 → KS0π+π− decays reconstructed in proton-proton collisions collected by the LHCb experiment in 2011 and 2012. Allowing for CP violation in mixing and in the interference between mixing and decay, we measure the CPaveraged normalized mass difference xCP = [2.7 ± 1.6 (stat) ± 0.4 (syst)] × 10−3 and the CP-violating parameter ∆x = [−0.53 ± 0.70 (stat) ± 0.22 (syst)] × 10−3. The results are consistent with CP symmetry. These determinations are the most precise from a single experiment and, combined with current world-average results, yield the first evidence that the masses of the neutral charm-meson eigenstates differ. Copyright © 2019, The Authors. All rights reserved.