We report measurements of direct CP-violating asymmetries in charmless decays of neutral bottom hadrons to pairs of charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 1 fb(-1) of integrated luminosity, we obtain the first measurements of direct CP violation in bottom strange mesons, A(CP)(B(s)(0) -> K(-) pi(+)) = +0.39 + 0.15(stat) +/- 0.08(syst), and bottom baryons, A(CP)(Lambda(0)(b) -> p pi(-)) = 0.03 +/- 0.17(stat) +/- 0.05(syst) and A(CP)(Lambda(0)(b) -> pK(-)) = +0.37 +/- 0.17(stat) +/- 0.03dsyst_. In addition, we measure CP violation in B(0) -> K(+) pi(-) decays with 3.5 sigma significance, A(CP)(B(0) -> K(+) pi(-)) = -0.086 +/- 0.023(stat) +/- 0.009(syst), in agreement with the current world average. Measurements of branching fractions of B(s)(0) -> K(+)K(-) and B(0) -> pi(+)pi- decays are also updated.
Measurements of Direct CP Violating Asymmetries in Charmless Decays of Strange Bottom Mesons and Bottom Baryons RID G-1087-2011 RID E-4473-2011
DELL'ORSO, MAURO;DONATI, SIMONE;PUNZI, GIOVANNI;
2011-01-01
Abstract
We report measurements of direct CP-violating asymmetries in charmless decays of neutral bottom hadrons to pairs of charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 1 fb(-1) of integrated luminosity, we obtain the first measurements of direct CP violation in bottom strange mesons, A(CP)(B(s)(0) -> K(-) pi(+)) = +0.39 + 0.15(stat) +/- 0.08(syst), and bottom baryons, A(CP)(Lambda(0)(b) -> p pi(-)) = 0.03 +/- 0.17(stat) +/- 0.05(syst) and A(CP)(Lambda(0)(b) -> pK(-)) = +0.37 +/- 0.17(stat) +/- 0.03dsyst_. In addition, we measure CP violation in B(0) -> K(+) pi(-) decays with 3.5 sigma significance, A(CP)(B(0) -> K(+) pi(-)) = -0.086 +/- 0.023(stat) +/- 0.009(syst), in agreement with the current world average. Measurements of branching fractions of B(s)(0) -> K(+)K(-) and B(0) -> pi(+)pi- decays are also updated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
