We present the first measurement of polarization and CP-violating asymmetries in a B-s(0) decay into two light vector mesons, B-s(0) -> phi phi, and an improved determination of its branching ratio using 295 decays reconstructed in a data sample corresponding to 2: 9 fb(-1) of integrated luminosity collected by the CDF experiment at the Fermilab Tevatron collider. The fraction of longitudinal polarization is determined to be f(L) = 0.348 +/- 0.041(stat) +/- 0.021(syst), and the branching ratio B(B-s(0) -> phi phi) = [2.32 +/- 0.18(stat) +/- 0.82(syst)] x 10(-5). Asymmetries of decay angle distributions sensitive to CP violation are measured to be A(u) = 0.007 +/- 0.064(stat) +/- 0.018(syst) and A(v) = -0.120 +/- 0.064(stat) +/- 0.016(syst).
Measurement of Polarization and Search for CP Violation in B-s(0) -> phi phi Decays
Di Ruzza B;
2011-01-01
Abstract
We present the first measurement of polarization and CP-violating asymmetries in a B-s(0) decay into two light vector mesons, B-s(0) -> phi phi, and an improved determination of its branching ratio using 295 decays reconstructed in a data sample corresponding to 2: 9 fb(-1) of integrated luminosity collected by the CDF experiment at the Fermilab Tevatron collider. The fraction of longitudinal polarization is determined to be f(L) = 0.348 +/- 0.041(stat) +/- 0.021(syst), and the branching ratio B(B-s(0) -> phi phi) = [2.32 +/- 0.18(stat) +/- 0.82(syst)] x 10(-5). Asymmetries of decay angle distributions sensitive to CP violation are measured to be A(u) = 0.007 +/- 0.064(stat) +/- 0.018(syst) and A(v) = -0.120 +/- 0.064(stat) +/- 0.016(syst).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
