Study of the rare decays of B s 0 and B 0 mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector

0519599 - FZÚ 2020 RIV US eng J - Článek v odborném periodiku
Aaboud, M. - Aad, G. - Abbott, B. - Chudoba, Jiří - Hejbal, Jiří - Hladík, Ondřej - Jačka, Petr - Jakoubek, Tomáš - Kepka, Oldřich - Kroll, Jiří - Kupčo, Alexander - Lokajíček, Miloš - Lysák, Roman - Marčišovský, Michal - Mikeštíková, Marcela - Němeček, Stanislav - Penc, Ondřej - Šícho, Petr - Staroba, Pavel - Svatoš, Michal - Taševský, Marek … celkem 2918 autorů
Study of the rare decays of B s 0 and B 0 mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector.
Journal of High Energy Physics. Roč. 2019, č. 4 (2019), s. 1-47, č. článku 098. ISSN 1029-8479. E-ISSN 1029-8479
Grant CEP: GA MŠMT LM2015058
Institucionální podpora: RVO:68378271
Klíčová slova: ATLAS * CERN LHC Coll * B0: rare decay * B/s0: rare decay * experimental results * B0 --> muon+ muon- * B/s0 --> muon+ muon- * 13000 GeV-cms
Obor OECD: Particles and field physics
Impakt faktor: 5.875, rok: 2019
Způsob publikování: Open access

A study of the decays B0s → μ+μ− and B0 → μ+μ− has been performed using 26.3 fb−1 of 13 TeV LHC proton-proton collision data collected with the ATLAS detector in 2015 and 2016. Since the detector resolution in μ+μ− invariant mass is comparable to the B0s -B0 mass difference, a single fit determines the signal yields for both decay modes. This results in a measurement of the branching fraction B(B0s→μ+μ−)=(3.2+1.1−1.0)×10−9 and an upper limit B(B0→μ+μ−)<4.3×10−10 at 95% confidence level. The result is combined with the Run 1 ATLAS result, yielding B(B0s→μ+μ−)=(2.8+0.8−0.7)×10−9 and B(B0→μ+μ−)<2.1×10−10 at 95% confidence level. The combined result is consistent with the Standard Model prediction within 2.4 standard deviations in the B(B0→μ+μ−)−B(B0s→μ+μ−) plane.



Trvalý link: http://hdl.handle.net/11104/0304591