Oscillations of B-s(0) mesons have been studied in samples selected from about 3.5 million hadronic Z decays detected by DELPHI between 1992 and 1995. One analysis uses events in the exclusive decay channels: B-s(0) --> D(s)(-)pi (+) or D(s)(-)a(1)(+) and B-s(0) --> (D) over bar (0)K(-)pi (+) or (D) over bar (0)K(-)a(1)(+), where D decays are completely reconstructed. In addition, B-s(0)-(B) over bar (0)(s) oscillations have been studied in events with an exclusively reconstructed D, accompanied in the same hemisphere by a high momentum hadron of opposite charge. Combining the two analyses, a limit on the mass difference between the physical B-s(0) states has been obtained: Deltam(Bs0) > 4.0 ps(-1) at the 95% C.L. with a sensitivity of Deltam(Bs0) = 3.2 ps(-1) Using the latter sample of events, the B-s(0) lifetime has been measured and an upper limit on the decay width difference between the two physical B-s(0) states has been obtained: tau (Bs0) = 1.53(-0.15)(+0.16)(stat.) +/- 0.07(syst.) ps Delta Gamma (Bs0)/Gamma (Bs0) < 0.69 at the 95% C.L. The combination of these results with those obtained using D(s)(+/-)l(+/-) sample gives: Deltam(Bs0) > 4.9 ps(-1) at the 95% C.L. with a sensitivity of Deltam(Bs0) = 8.7 ps(-1) tau (Bs0) = 1.46 +/- 0.11 ps and Delta Gamma (Bs0)/Gamma (Bs0) < 0.45 at the 95% C.L.

Study of B0s - B0s-bar oscillations and B0s lifetimes using hadronic decays of B0s mesons

BARBIELLINI AMIDEI, GUIDO;DELLA RICCA, GIUSEPPE;POROPAT, PAOLO;VITALE, LORENZO
2000

Abstract

Oscillations of B-s(0) mesons have been studied in samples selected from about 3.5 million hadronic Z decays detected by DELPHI between 1992 and 1995. One analysis uses events in the exclusive decay channels: B-s(0) --> D(s)(-)pi (+) or D(s)(-)a(1)(+) and B-s(0) --> (D) over bar (0)K(-)pi (+) or (D) over bar (0)K(-)a(1)(+), where D decays are completely reconstructed. In addition, B-s(0)-(B) over bar (0)(s) oscillations have been studied in events with an exclusively reconstructed D, accompanied in the same hemisphere by a high momentum hadron of opposite charge. Combining the two analyses, a limit on the mass difference between the physical B-s(0) states has been obtained: Deltam(Bs0) > 4.0 ps(-1) at the 95% C.L. with a sensitivity of Deltam(Bs0) = 3.2 ps(-1) Using the latter sample of events, the B-s(0) lifetime has been measured and an upper limit on the decay width difference between the two physical B-s(0) states has been obtained: tau (Bs0) = 1.53(-0.15)(+0.16)(stat.) +/- 0.07(syst.) ps Delta Gamma (Bs0)/Gamma (Bs0) < 0.69 at the 95% C.L. The combination of these results with those obtained using D(s)(+/-)l(+/-) sample gives: Deltam(Bs0) > 4.9 ps(-1) at the 95% C.L. with a sensitivity of Deltam(Bs0) = 8.7 ps(-1) tau (Bs0) = 1.46 +/- 0.11 ps and Delta Gamma (Bs0)/Gamma (Bs0) < 0.45 at the 95% C.L.
THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS
http://link.springer.com.px.units.it/article/10.1007/s100520000531
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2576048
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