Constraints on the ${\chi_{\mathrm{c}1}}$ versus ${\chi_{\mathrm{c}2}}$ polarizations in proton-proton collisions at $\sqrt{s} = $ 8 TeV
Albert M Sirunyan,Robin Erbacher, Camilo Andres Carrillo Montoya, Wagner Carvalho,Maciej Górski,Danek Kotlinski, Cole Lindsey,Balazs Ujvari, Samila Muthumuni, Vinicius Massami Mikuni,Alfredo Gurrola, Basile Vermassen,Young-Il Choi, Roumyana Hadjiiska, Ian Laflotte, Ian Mcalister,Willard Johns,Lorenzo Uplegger, Pierre Van Hove, Mohammad Alhusseini, Alberto Orso Maria Iorio, Ulrich Heintz, Alessandro Thea, Giuseppe Latino,Andrew Hart, Federico Vazzoler,Sinan Sagir, Georgios Tsipolitis,Jennifer Chu,Cristian Pena,Jozsef Molnar,Soureek Mitra,Torben Dreyer, Sergei Slabospitskii,Shamik Ghosh, Mircho Rodozov, Michael Tytgat, Robert Schöfbeck,Luc Pape, James Hirschauer, Andreas Nürnberg, Burak Bilki,Francisco Yumiceva, Evrim Ersin Kangal,Reza Goldouzian, Victor Golovtcov,Ram Krishna Dewanjee, Chiara Rovelli, Daniele Fasanella,Wei Shi,Robert Hirosky, Santeri Laurila, Zhen Hu,Hans Reithler,Lalit Mohan Pant, Danila Tlisov, Austin Baty, Tomas Lindén,Zachary Lesko, Jonathon Langford,Graham 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Papavergou, Vuko Brigljevic, Anne Dabrowski, Francesco Fallavollita, Livio Fanò, Antonio Ranieri, Anton Karneyeu, Gaël Perrin, Konstantinos Manolopoulos, Volodymyr Myronenko, Anadi Canepa, Bryan Caraway, Marco Cipriani, Aruna Nayak, Chandiprasad Kar, Giovanni Franzoni, Soham Bhattacharya, Andromachi Tsirou, Ennio Monteil, Agostino Di Francesco, Jack King, Stephen Mrenna, Alexis Kalogeropoulos, Andreas Mussgiller, Manuel Alejandro Segura Delgado, Georgios Mavromanolakis, Suyong Choi, Pietro Govoni, Tagir Aushev, Shuichi Kunori, Andreas Psallidas, Yonghoon Lee, Francesco Micheli, Stephan Lammel, Alexander Schmidt, Christopher Neu, Min Suk Kim, Mikhail Kirsanov, Shahram Rahatlou, Cameron Bravo, John Perry Cumalat, Giuseppe Iaselli, Ian Watson, Loukas Gouskos, Paolo Capiluppi, Alessandro Di Mattia, Süleyman Durgut, Robert M Brown, Maria Margherita Obertino, Panagiotis Kokkas, Igor Azhgirey, Thomas Ferguson, Kerstin Borras, Gail Hanson, Andrea Malara, Felicitas Pauss, Muhammad Imran Malik Awan, Shashikant Dugad, Manjit Kaur, Christophe Royon, Ashley Parker, Kevin Sung
Physical Review Letters（2020）
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摘要
The polarizations of promptly produced χc1 and χc2 mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at s=8 TeV. The χc states are reconstructed via their radiative decays χc→J/ψγ, with the photons being measured through conversions to e+e−, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χc2 to χc1 yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ→μ+μ- decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum.
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