Measurement of the $CP$-violating phase $\phi_\mathrm{s}$ in the B$^0_\mathrm{s}\to$ J$/\psi\, \phi$(1020) $\to \mu^+\mu^-$K$^+$K$^-$ channel in proton-proton collisions at $\sqrt{s} =$ 13 TeV Albert M Sirunyan , Armen Tumasyan , Wolfgang Adam , Federico Ambrogi , Thomas Bergauer , Marko Dragicevic , Janos Erö , Alberto Escalante del Valle , Rudolf Fruehwirth , Manfred Jeitler , Natascha Krammer , Lukas Lechner , Dietrich Liko , Thomas Madlener , Ivan Mikulec , Florian Michael Pitters , Navid Rad , Jochen Schieck , Robert Schöfbeck , Markus Spanring , Sebastian Templ , Wolfgang Waltenberger , Claudia-Elisabeth Wulz , Mateusz Zarucki , Vladimir Chekhovsky , Aliaksandr Litomin , Vladimir Makarenko , Juan Suarez Gonzalez , Mohamed Rashad Darwish , Eddi A de Wolf , Davide Di Croce , Xavier Janssen , Tomas Kello , Aleksandra Lelek , Maxim Pieters , Haifa Rejeb Sfar , Hans van Haevermaet , Pierre van Mechelen , Senne van Putte , Nick van Remortel , Freya Blekman , Emil Sørensen Bols , Simranjit Singh Chhibra , Jorgen d'Hondt , Jarne de Clercq , Denys Lontkovskyi , Steven Lowette , Ivan Marchesini , Seth Moortgat , Alexander Morton , Quentin Python , Stefaan Tavernier , Walter van Doninck , Petra van Mulders , Diego Beghin , Bugra Bilin , Barbara Clerbaux , Gilles de Lentdecker , Hugo Delannoy , Brian Dorney , Laurent Favart , Anastasia Grebenyuk , Amandeep Kaur Kalsi , Inna Makarenko , Louis Moureaux , Laurent Pétré , Andrey Popov , Nicolas Postiau , Elizabeth Starling , Laurent Thomas , Catherine Vander Velde , Pascal Vanlaer , David Vannerom , Liam Wezenbeek , Tom Cornelis , Didar Dobur , Marek Gruchala , Illia Khvastunov , Marek Niedziela , Christos Roskas , Kirill Skovpen , Michael Tytgat , Willem Verbeke , Basile Vermassen , Martina Vit , Giacomo Bruno , Florian Joel J Bury , Claudio Caputo , Pieter David , Christophe Delaere , Martin Delcourt , Izzeddin Suat Donertas , Andrea Giammanco , Vincent Lemaitre , Kuntal Mondal , Jessica Prisciandaro , Angela Taliercio , Maksym Teklishyn , Pietro Vischia , Sophie Wuyckens , Joze Zobec , Gilvan Alves , Gilson Correia Silva , Carsten Hensel , Arthur Moraes , Walter Luiz Aldá Júnior , Ewerton Belchior Batista das Chagas , Helena Brandao Malbouisson , Wagner Carvalho , Jose Chinellato , Eduardo Coelho , Eliza Melo da Costa , Gustavo Gil da Silveira , Dilson de Jesus Damiao , Sandro Fonseca de Souza , Jordan Martins , Diego Matos Figueiredo , Miguel Medina Jaime , Miqueias Melo de Almeida , Clemencia Mora Herrera , Luiz Mundim , Helio Nogima , Patricia Rebello Teles , Luis Sanchez Rosas , Alberto Santoro , Sheila Mara Silva Amaral , Andre Sznajder , Mauricio Thiel , Edmilson José Tonelli Manganote , Felipe Torres da Silva de Araujo , Antonio Vilela Pereira , Cesar Augusto Bernardes , Luigi Calligaris , Thiago Tomei , Eduardo de Moraes Gregores , Dener de Souza Lemos , Pedro G Mercadante , Sergio F Novaes , Sandra Padula , Aleksandar Aleksandrov , Georgy Antchev , Ivan Atanasov , Roumyana Hadjiiska , Plamen Iaydjiev , Milena Misheva , Mircho Rodozov , Mariana Shopova , Georgi Sultanov , Miroslav Bonchev , Anton Dimitrov , Todor Ivanov , Leander Litov , Borislav Pavlov , Peicho Petkov , Anton Petrov , Wenxing Fang , Qianying Guo , Hanwen Wang , Li Yuan , Muhammad Ahmad , Zhen Hu , Yi Wang , Emilien Chapon , Guo-Ming Chen , He-Sheng Chen , Mingshui Chen , Duncan Leggat , Hongbo Liao , Zhenan Liu , Ramkrishna Sharma , Aniello Spiezia , Junquan Tao , Joshuha Thomas-Wilsker , Jin Wang , Huaqiao Zhang , Sijing Zhang , Jingzhou Zhao , Antonis Agapitos , Yong Ban , Cheng Chen , Andrew Levin , Jing Li , Qiang Li , Meng Lu , Xudong Lyu , Yajun Mao , Si-Jin Qian , Dayong Wang , Qun Wang , Jie Xiao , Zhengyun You , Xuyang Gao , Meng Xiao , Carlos Avila , Andrés Cabrera , Carlos Florez , Jorge Fraga , Amal Sarkar , Manuel Alejandro Segura Delgado , Johny Jaramillo , Jhovanny Mejia Guisao , Felipe Ramirez , José David Ruiz Alvarez , Camilo Andrés Salazar González , Nelson Vanegas Arbelaez , Duje Giljanovic , Nikola Godinovic , Damir Lelas , Ivica Puljak , Toni Sculac , Zeljko Antunovic , Marko Kovac , Vuko Brigljevic , Dinko Ferencek , Devdatta Majumder , Benjamin Mesic , Matej Roguljic , Andrei Starodumov , Tatjana Susa , Mohsan Waseem Ather , Alexandros Attikis , Eleni Erodotou , Aimilios Ioannou , Gouranga Kole , Marina Kolosova , Sotiroulla Konstantinou , Georgios Mavromanolakis , Jehad Mousa , Charalambos Nicolaou , Fotios Ptochos , Panos A Razis , Hans Rykaczewski , Halil Saka , Demetra Tsiakkouri , Miroslav Finger , Michael Finger , Antonin Kveton , Jan Tomsa , Edy Ayala , Edgar Carrera Jarrin , Ahmed Ali Abdelalim , Shimaa Abu Zeid , Shaaban Khalil , Ahmad Lotfy , Mohammed Mahmoud , Sandeep Bhowmik , Alexandra Carvalho Antunes de Oliveira , Ram Krishna Dewanjee , Karl Ehataht , Mario Kadastik , Martti Raidal , Christian Veelken , Paula Eerola , Laurent Forthomme , Henning Kirschenmann , Kenneth Osterberg , Mikko Voutilainen , Erik Brücken , Francisco Ignacio Garcia Fuentes , Joona Havukainen , Veikko Karimäki , Min Suk Kim , Ritva Kinnunen , Tapio Lampén , Kati Lassila-Perini , Santeri Laurila , Sami Lehti , Tomas Lindén , Hannu Siikonen , Eija Tuominen , Jorma Tuominiemi , Panja-Riina Luukka , Tuure Tuuva , Marc Besancon , Fabrice Couderc , Marc Dejardin , Daniel Denegri , Jean-Louis Faure , Federico Ferri , Serguei Ganjour , Alain Givernaud , Philippe Gras , Gautier Hamel de Monchenault , Patrick Jarry , Bruno Lenzi , Elizabeth Locci , Julie Malcles , John Rander , André Rosowsky , Mehmet Özgür Sahin , Aurore Savoy-Navarro , Maksym Titov , Geum Bong Yu , Sudha Ahuja , Chiara Amendola , Florian Beaudette , Matteo Bonanomi , Philippe Busson , Claude Charlot , Olivier Davignon , Batoul Diab , Guillaume Falmagne , Raphael Granier de Cassagnac , Inna Kucher , Artur Lobanov , Cristina Martin Perez , Matthew Nguyen , Christophe Ochando , Pascal Paganini , Jonas Rembser , Roberto Salerno , Jean-Baptiste Sauvan , Yves Sirois , Alexandre Zabi , Amina Zghiche , Jean-Laurent Agram , Jeremy Andrea , Daniel Bloch , Guillaume Bourgatte , Jean-Marie Brom , Eric Christian Chabert , Caroline Collard , Jean-Charles Fontaine , Denis Gelé , Ulrich Goerlach , Clément Grimault , Anne-Catherine Le Bihan , Pierre van Hove , Ece Asilar , Stephanie Beauceron , Colin Bernet , Gaelle Boudoul , Camille Camen , Aurélien Carle , Nicolas Chanon , Didier Contardo , Pierre Depasse , Houmani El Mamouni , Jean Fay , Susan Gascon , Maxime Gouzevitch , Bernard Ille , Sandhya Jain , Imad Baptiste Laktineh , Hugues Lattaud , Antoine Lesauvage , Morgan Lethuillier , Laurent Mirabito , Lucas Torterotot , Gaël Touquet , Muriel Vander Donckt , Sébastien Viret , Tengizi Toriashvili , Zviad Tsamalaidze , Lutz Feld , Katja Klein , Martin Lipinski , Danilo Meuser , Alexander Pauls , Marius Preuten , Max Philip Rauch , Johannes Schulz , Marius Teroerde , Dmitry Eliseev , Martin Erdmann , Peter Fackeldey , Benjamin Fischer , Saranya Ghosh , Thomas Hebbeker , Kerstin Hoepfner , Henning Keller , Luca Mastrolorenzo , Markus Merschmeyer , Arnd Meyer , Philipp Millet , Giovanni Mocellin , Spandan Mondal , Swagata Mukherjee , Dennis Noll , Andrzej Novak , Tobias Pook , Andrey Pozdnyakov , Thorben Quast , Markus Radziej , Yannik Rath , Hans Reithler , Jonas Roemer , Alexander Schmidt , Simon Christoph Schuler , Sebastian Wiedenbeck , Shawn Zaleski , Christian Dziwok , Günter Flügge , Wael Haj Ahmad , Olena Hlushchenko , Thomas Kress , Andreas Nowack , Claudia Pistone , Oliver Pooth , Dennis Roy , Hale Sert , Achim Stahl , Tim Ziemons , Henriette Aarup Petersen , Maria Aldaya Martin , Paul Asmuss , Illia Babounikau , Samuel Baxter , Olaf Behnke , Armando Bermúdez Martínez , Afiq Aizuddin Bin Anuar , Kerstin Borras , Valeria Botta , David Brunner , Alan Campbell , Andrea Cardini , Patrick Connor , Sandra Consuegra Rodríguez , Vladyslav Danilov , Adinda de Wit , Matteo Maria Defranchis , Leonid Didukh , Daniela Domínguez Damiani , Guenter Eckerlin , Doris Eckstein , Thomas Eichhorn , Adam Elwood , Luis Ignacio Estevez Banos , Elisabetta Gallo , Achim Geiser , Angela Giraldi , Alexander Grohsjean , Moritz Guthoff , Ali Harb , Abideh Jafari , Nur Zulaiha Jomhari , Hannes Jung , Ashraf Mohamed , Matthias Kasemann , Hessamoddin Kaveh , James Keaveney , Claus Kleinwort , Joscha Knolle , Dirk Krücker , Wolfgang Lange , Teresa Lenz , Jindrich Lidrych , Katerina Lipka , Wolfgang Lohmann , Rainer Mankel , Isabell-Alissandra Melzer-Pellmann , Josry Metwally , Andreas Bernhard Meyer , Mareike Meyer , Marino Missiroli , Joachim Mnich , Andreas Mussgiller , Volodymyr Myronenko , Younes Otarid , Danyer Pérez Adán , Svenja Karen Pflitsch , Daniel Pitzl , Alexei Raspereza , Alessia Saggio , Andrej Saibel , Mykola Savitskyi , Valerie Scheurer , Paul Schütze , Christian Schwanenberger , Rostyslav Shevchenko , Akshansh Singh , Rafael Eduardo Sosa Ricardo , Heiner Tholen , Nicolas Tonon , Oleksii Turkot , Antonio Vagnerini , Merijn van de Klundert , Roberval Walsh , David Walter , Yiwen Wen , Katarzyna Wichmann , Christoph Wissing , Sebastian Wuchterl , Oleksandr Zenaiev , Radek Zlebcik , Robin Aggleton , Samuel Bein , Lisa Benato , Anna Benecke , Ksenia de Leo , Torben Dreyer , Aliakbar Ebrahimi , Finn Feindt , Alexander Fröhlich , Christoph Garbers , Erika Garutti , Daniel Gonzalez , Paolo Gunnellini , Johannes Haller , Andreas Hinzmann user-5f8cf7e04c775ec6fa691c92(2020)
摘要
The $CP$-violating weak phase $\phi_\mathrm{s}$ and the decay width difference $\Delta\Gamma_\mathrm{s}$ between the light and heavy B$^0_\mathrm{s}$ mass eigenstates are measured with the CMS detector at the LHC in a sample of 48500 reconstructed B$^0_\mathrm{s}\to$ J$/\psi\, \phi$(1020) $\to \mu^+\mu^-$K$^+$K$^-$ events. The measurement is based on a data sample corresponding to an integrated luminosity of 96.4 fb$^{-1}$, collected in proton-proton collisions at $\sqrt{s} =$ 13 TeV in 2017-2018. To extract the values of $\phi_\mathrm{s}$ and $\Delta\Gamma_\mathrm{s}$, a time-dependent and flavor-tagged angular analysis of the $ \mu^+\mu^-$K$^+$K$^-$ final state is performed. The analysis employs a dedicated tagging trigger and a novel opposite-side muon flavor tagger based on machine learning techniques. The measurement yields $\phi_\mathrm{s} = -$11 $\pm$ 50 (stat) $\pm$ 10 (syst) mrad and $\Delta\Gamma_\mathrm{s} =$ 0.114 $\pm$ 0.014 (stat) $\pm$ 0.007 (syst) ps$^{-1}$, in agreement with the standard model predictions. When combined with the previous CMS measurement at $\sqrt{s} =$ 8 TeV, the following values are obtained: $\phi_\mathrm{s} = -$21 $\pm$ 45 mrad, $\Delta\Gamma_\mathrm{s} =$ 0.1073 $\pm$ 0.0097 ps$^{-1}$, a significant improvement over the 8 TeV result.
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关键词
Muon, Standard Model, Proton, Luminosity, Particle physics, Large Hadron Collider, Physics, K channels
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