Observation of a $$ {\varLambda}_b^0 $$ − $$ {\overline{\varLambda}}_b^0 $$ production asymmetry in proton-proton collisions at $$ \sqrt{s} $$ = 7 and 8 TeV

Autor: B. Pietrzyk, Thomas Peter Jones, Cheryl Pappenheimer, Andrea Lampis, G. Carboni, Y. H. Zheng, Xiaolong Hu, C. J. G. Onderwater, X. Han, Alexander Inglessi, M. Brodski, Elena Graverini, D. E. Hutchcroft, Pascal Vincent, L. Zhang, Christoph Hasse, G. Passaleva, Christopher James Pawley, Lukas Calefice, Eliane Epple, Harris Conan Bernstein, S. Ferreres Sole, Marcel Materok, Valeriia Lukashenko, Christopher Burr, L. M. Garcia Martin, Alina Zharkova, Rizwaan Adeeb Mohammed, V. Gibson, C. Bozzi, Davide Fazzini, K. Carvalho Akiba, T. Ruf, Sevda Esen, Anton Philippov, Nicola Serra, Xiao-Rui Lyu, Dmitry Popov, Simon Akar, Vitalii Lisovskyi, Dawid Gerstel, P. Spradlin, Malte Hecker, Almagul Kondybayeva, D. Hynds, Marina Artuso, Vladimir Macko, Jake Alexander Ward, Y. Li, G. Lanfranchi, M.-N. Minard, A. Vorobyev, F. Dordei, D. Vom Bruch, Andrew Beiter, U. Marconi, R. J. Barlow, E. L. Gkougkousis, L. Garrido, Marta Calvi, Hans Dembinski, E. Grauges, I. Nasteva, Yury Guz, A. Bay, Chenzhi Dong, X. K. Zhou, Jake Lewis Amey, Julian Alexander Boelhauve, Marco Adinolfi, A. Fernandez Prieto, Emmy Gabriel, Alessandro Minotti, Ph. Charpentier, Daniel Berninghoff, R. Nandakumar, R. Silva Coutinho, B. T. Meadows, Ryan Newcombe, G. Raven, D. Decamp, Kevin Heijhoff, Lorenzo Capriotti, Alexander Malinin, Marie Bachmayer, Yang Yang, G. Mancinelli, Conor Fitzpatrick, A. Brea Rodriguez, Dmitrii Ilin, A. Lai, A. Golutvin, M. D. Sokoloff, Andrea Mauri, Wenbin Qian, P. Gandini, Luca Minzoni, Dylan Jaide White, Michela Garau, Ryunosuke Hugo O'Neil, A. G. Morris, Shuaiyi Liu, A. Dovbnya, J. J. Walsh, Davide Lancierini, Claudia Bertella, Aleksandra Snoch, Y. G. Gao, Benedetto Gianluca Siddi, Jascha Peter Grabowski, V. Shevchenko, Yiheng Luo, Deepanwita Dutta, Stefano Petrucci, W. Wislicki, Adam Davis, Alessandro Scarabotto, Aleksei Andreianov, Lingzhu Bian, Evgenii Shmanin, R. Santacesaria, S. Perazzini, M. Franco Sevilla, Alexey A. Petrov, Joseph David Shupperd, A. Jawahery, Jie Yu, Ahmed Sameh Wagih Abdelmotteleb, J. Maratas, Ifan Williams, Sergei Popov, T. E. Latham, G. Valenti, Agnieszka Oblakowska-Mucha, Victor Renaudin, T. J. V. Bowcock, Anthony Gavin Downes, Elisabet Golobardes, A. B. Rodrigues, D. Websdale, B. Couturier, R. A. Fini, C. Abellán Beteta, Shuangli Yang, Sandra Amato, A. Bondar, B. Schmidt, Ivan Belyaev, Artur Ishteev, C. Parkes, Silvia Gambetta, Daniel Patrick O'Hanlon, O. Lantwin, Paul Andre Günther, C. Haen, Artem Maevskiy, C. B. Van Hulse, Matteo Salomoni, Kenenbek Arzymatov, A. Pereiro Castro, C. Santamarina Rios, Thomas Grammatico, P. K Resmi, M. van Veghel, G. Martellotti, V. Bellee, W. D. Hulsbergen, Aidan Richard Wiederhold, Konstantinos Petridis, J. A. Rodriguez Lopez, A. Brossa Gonzalo, P. Gironella Gironell, Tabitha Halewood-leagas, Carmen Giugliano, Silvia Borghi, S. Farry, Razvan Daniel Moise, Julien Cogan, Oleg Yushchenko, Kuzma Ivshin, Benjamin Audurier, Joan Mauricio, Philipp Ibis, David Anthony Friday, K. 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Reiss, Manuel Schiller, Lauren Douglas, Wojciech Krupa, Gary Robertson, Sergey Gromov, Bhagyashree Pagare, Hilbrand Steffen Kuindersma, A. Di Cicco, Tomasz Fiutowski, P. Collins, Y. Sun, Gerwin Meier, Serena Maccolini, S. Kandybei, J. A. B. Coelho, Jan Patrick Hammerich, T. Kirn, A. Dziurda, Claire Prouve, Neville Harnew, Ettore Zaffaroni, K. Wyllie, S. G. Weber
Rok vydání: 2021
Předmět:
Zdroj: Journal of High Energy Physics. 2021
ISSN: 1029-8479
Popis: This article presents differential measurements of the asymmetry between $$ {\varLambda}_b^0 $$ Λ b 0 and $$ {\overline{\varLambda}}_b^0 $$ Λ ¯ b 0 baryon production rates in proton-proton collisions at centre-of-mass energies of $$ \sqrt{s} $$ s = 7 and 8 TeV collected with the LHCb experiment, corresponding to an integrated luminosity of 3 fb−1. The $$ {\varLambda}_b^0 $$ Λ b 0 baryons are reconstructed through the inclusive semileptonic decay $$ {\varLambda}_b^0 $$ Λ b 0 → $$ {\varLambda}_c^{+} $$ Λ c + μ−$$ \overline{\nu} $$ ν ¯ μX. The production asymmetry is measured both in intervals of rapidity in the range 2.15 < y < 4.10 and transverse momentum in 2 < pT< 27 GeV/c. The results are found to be incompatible with symmetric production with a significance of 5.8 standard deviations for both $$ \sqrt{s} $$ s = 7 and 8 TeV data, assuming no CP violation in the decay. There is evidence for a trend as a function of rapidity with a significance of 4 standard deviations. Comparisons to predictions from hadronisation models in Pythia and heavy-quark recombination are provided. This result constitutes the first observation of a particle-antiparticle asymmetry in b-hadron production at LHC energies.
Databáze: OpenAIRE