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
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.]