Bibcode
Tuovinen, E.; Wendland, L.; Lindén, T.; Lassila-Perini, K.; Lehti, S.; Sirunyan, A. M.; Khachatryan, V.; Luukka, P.; Tuominiemi, J.; Lampén, T.; Karimäki, V.; Kinnunen, R.; Järvinen, T.; Härkönen, J.; Voutilainen, M.; Eerola, P.; Pekkanen, J.; Tiko, A.; Veelken, C.; Raidal, M.; Perrini, L.; Kadastik, M.; Murumaa, M.; Calpas, B.; Radi, A.; Mahmoud, M. A.; Ellithi Kamel, A.; Carrera Jarrin, E.; Finger, M.; Finger, M.; Tsiakkouri, D.; Razis, P. A.; Rykaczewski, H.; Nicolaou, C.; Ptochos, F.; Mousa, J.; Attikis, A.; Mavromanolakis, G.; Sudic, L.; Susa, T.; Micanovic, S.; Ferencek, D.; Kadija, K.; Brigljevic, V.; Kovac, M.; Antunovic, Z.; Sculac, T.; Ribeiro Cipriano, P. M.; Puljak, I.; Lelas, D.; Godinovic, N.; Sanabria, J. C.; Ruiz Alvarez, J. D.; Gomez, J. P.; González Hernández, C. F.; Chaparro Sierra, L. F.; Florez, C.; Cabrera, A.; Avila, C.; Wang, D.; Xu, Z.; Qian, S. J.; Mao, Y.; Liu, S.; Chen, G.; Li, Q.; Ban, Y.; Zhao, J.; Zhang, H.; Wang, C.; Wang, Z.; Tao, J.; Spiezia, A.; Romeo, F.; Shaheen, S. M.; Leggat, D.; Liu, Z.; Jiang, C. H.; Cheng, T.; Chen, Y.; Chen, H. S.; Chen, M.; Bian, J. G.; Chen, G. M.; Ahmad, M.; Petkov, P.; Fang, W.; Pavlov, B.; Litov, L.; Dimitrov, A.; Glushkov, I.; Vutova, M.; Sultanov, G.; Stoykova, S.; Rodozov, M.; Hadjiiska, R.; Iaydjiev, P.; Aleksandrov, A.; Romero Abad, D.; Ruiz Vargas, J. C. et al.
Bibliographical reference
Journal of High Energy Physics, Volume 2017, Issue 5, article id. #13, 34 pp.
Advertised on:
5
2017
Citations
102
Refereed citations
82
Description
Pair production of Y(1S) mesons is observed at the LHC in proton-proton
collisions at √{s}=8 TeV by the CMS experiment in a data sample
corresponding to an integrated luminosity of 20.7 fb-1. Both
Y(1S) candidates are fully reconstructed via their decays to μ
+ μ -. The fiducial acceptance region is
defined by an absolute Y(1S) rapidity smaller than 2.0. The fiducial
cross section for the production of Y(1S) pairs, assuming that both
mesons decay isotropically, is measured to be 68.8±12.7
(stat)±7.4 (syst)±2.8 ( B ) pb, where the third
uncertainty comes from the uncertainty in the branching fraction of
Y(1S) decays to μ + μ -. Assuming instead
that the Y(1S) mesons are produced with different polarizations leads to
variations in the measured cross section in the range from -38% to +36%.
[Figure not available: see fulltext.]