Study of the rare decays of B s0 and B 0 mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector
- Author(s): Aaboud, M
- Aad, G
- Abbott, B
- Abbott, DC
- Abdinov, O
- Abeloos, B
- Abhayasinghe, DK
- Abidi, SH
- AbouZeid, OS
- Abraham, NL
- Abramowicz, H
- Abreu, H
- Abulaiti, Y
- Acharya, BS
- Adachi, S
- Adam, L
- Adamczyk, L
- Adamek, L
- Adelman, J
- Adersberger, M
- Adiguzel, A
- Adye, T
- Affolder, AA
- Afik, Y
- Agheorghiesei, C
- Aguilar-Saavedra, JA
- Ahmadov, F
- Aielli, G
- Akatsuka, S
- Åkesson, TPA
- Akilli, E
- Akimov, AV
- Alberghi, GL
- Albert, J
- Albicocco, P
- Alconada Verzini, MJ
- Alderweireldt, S
- Aleksa, M
- Aleksandrov, IN
- Alexa, C
- Alexandre, D
- Alexopoulos, T
- Alhroob, M
- Ali, B
- Alimonti, G
- Alison, J
- Alkire, SP
- Allaire, C
- Allbrooke, BMM
- Allen, BW
- Allport, PP
- Aloisio, A
- Alonso, A
- Alonso, F
- Alpigiani, C
- Alshehri, AA
- Alstaty, MI
- Alvarez Gonzalez, B
- Álvarez Piqueras, D
- Alviggi, MG
- Amadio, BT
- Amaral Coutinho, Y
- Ambler, A
- Ambroz, L
- Amelung, C
- Amidei, D
- Amor Dos Santos, SP
- Amoroso, S
- Amrouche, CS
- An, F
- Anastopoulos, C
- Ancu, LS
- Andari, N
- Andeen, T
- Anders, CF
- Anders, JK
- Anderson, KJ
- Andreazza, A
- Andrei, V
- Anelli, CR
- Angelidakis, S
- Angelozzi, I
- Angerami, A
- Anisenkov, AV
- Annovi, A
- Antel, C
- Anthony, MT
- Antonelli, M
- Antrim, DJA
- Anulli, F
- Aoki, M
- Aparisi Pozo, JA
- Aperio Bella, L
- Arabidze, G
- Araque, JP
- Araujo Ferraz, V
- Araujo Pereira, R
- Arce, ATH
- Ardell, RE
- Arduh, FA
- et al.
Abstract
© 2019, The Author(s). A study of the decays B s0 → μ + μ − and B 0 → 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 B s0 -B 0 mass difference, a single fit determines the signal yields for both decay modes. This results in a measurement of the branching fraction ℬ(Bs0→μ+μ−)=(3.2−1.0+1.1)×10−9 and an upper limit ℬ (B→ μ + μ − ) < 4.3 × 10 − 10 at 95% confidence level. The result is combined with the Run 1 ATLAS result, yielding ℬ(Bs0→μ+μ−)=(2.8−0.7+0.8)×10−9 and ℬ (B→ 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(Bs0→μ+μ−) plane.[Figure not available: see fulltext.]