Observation of the B0s→η′η′ decay
- Aaij, R.
- Amhis, Y.
- Barsuk, S.
- Borsato, M.
- Kochebina, O.
- Lefrançois, J.
- Li, Y.
- Machefert, F.
- Quagliani, R.
- Robbe, P.
- Schune, M.-H.
- Teklishyn, M.
- Vallier, A.
- Viaud, B.
- Wormser, G.
- Ajaltouni, Ziad, Zj
- Baalouch, M.
- Cogneras, E.
- Deschamps, O.
- El Rifai, I.
- Gazzoni, G.
- Grabalosa Gándara, M.
- Henrard, Pierre
- Hoballah, M.
- Lefèvre, R.
- Maratas, J.
- Monteil, S.
- Niess, V.
- Perret, P.
- S., Akar
- E., Aslanides
- J., Cogan
- P., Durante
- W., Kanso
- R., Legac
- Leroy, O.
- G., Mancinelli
- A., Mordà
- Serrano, J.
- Tsaregorodtsev, A.
- Beaucourt, L.
- Chefdeville, M.
- Decamp, D.
- Déléage, N.
- Ghez, Ph.
- Lees, J.-P.
- Marchand, J.F.
- Minard, M.-N.
- Pietrzyk, B.
- Qian, W.
- t'Jampens, S.
- Tisserand, V.
- Tournefier, E.
DOIAbstract
See paper for full list of authorsInternational audienceThe first observation of the B0s→η′η′ decay is reported. The study is based on a sample of proton-proton collisions corresponding to 3.0 fb−1 of integrated luminosity collected with the LHCb detector. The significance of the signal is 6.4 standard deviations. The branching fraction is measured to be [3.31±0.64(stat)±0.28(syst)±0.12(norm)]×10−5, where the third uncertainty comes from the B±→η′K± branching fraction that is used as a normalisation. In addition, the charge asymmetries of B±→η′K± and B±→ϕK±, which are control channels, are measured to be (−0.2±1.3)% and (+1.7±1.3)%, respectively. All results are consistent with theoretical expectations
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