Observation of Y(1S) pair production in proton-proton collisions at √{s}=8 TeV

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
Number of authors
2292
IAC number of authors
1
Citations
94
Refereed citations
71
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.]
Type