The first observation of the rare decay Bs0âÏÏ+Ï- and evidence for B0âÏÏ+Ï- are reported, using pp collision data recorded by the LHCb detector at center-of-mass energies s=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb-1. The branching fractions in the Ï+Ï- invariant mass range 400<m(Ï+Ï-)<1600 MeV/c2 are [3.48±0.23±0.17±0.35]Ã10-6 and [1.82±0.25±0.41±0.14]Ã10-7 for Bs0âÏÏ+Ï- and B0âÏÏ+Ï- respectively, where the uncertainties are statistical, systematic and from the normalization mode Bs0âÏÏ. A combined analysis of the Ï+Ï- mass spectrum and the decay angles of the final-state particles identifies the exclusive decays Bs0âÏf0(980), Bs0âÏf2(1270), and Bs0âÏÏ0 with branching fractions of [1.12±0.16-0.08+0.09±0.11]Ã10-6, [0.61±0.13-0.05+0.12±0.06]Ã10-6 and [2.7±0.7±0.2±0.2]Ã10-7, respectively.
Observation of the decay Bs0 →φπ+π- and evidence for B0 →φπ+π-
De Serio, M.;Pappagallo, M.;Simone, S.;
2017-01-01
Abstract
The first observation of the rare decay Bs0âÏÏ+Ï- and evidence for B0âÏÏ+Ï- are reported, using pp collision data recorded by the LHCb detector at center-of-mass energies s=7 and 8 TeV, corresponding to an integrated luminosity of 3 fb-1. The branching fractions in the Ï+Ï- invariant mass range 400I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.