An analysis of B+→K<inf>S</inf>0π+ ; B+→K<inf>S</inf>0K+ decays is performed with the LHCb experiment. The pp collision data used correspond to integrated luminosities of 1fb-1 ; 2fb-1 collected at centre-of-mass energies of √s=7TeV ; √s=8TeV, respectively. The ratio of branching fractions ; the direct CP asymmetries are measured to be B(B+→K<inf>S</inf>0K+)/B(B+→K<inf>S</inf>0π+)=0.064±0.009 (stat.)±0.004(syst.), ACP(B+→K<inf>S</inf>0π+)=-0.022±0.025(stat.)±0.010 (syst.) ; ACP(B+→K<inf>S</inf>0K+)=-0.21±0.14 (stat.)±0.01 (syst.). The data sample taken at √s=7 TeV is used to search for B<inf>c</inf>+→K<inf>S</inf>0K+ decays ; results in the upper limit (f<inf>c</inf>dot operatorB(B<inf>c</inf>+→K<inf>S</inf>0K+))/(fudot operatorB(B+→K<inf>S</inf>0π+))<5.8×10-2 at 90% confidence level, where f<inf>c</inf> ; f<inf>u</inf> denote the hadronisation fractions of a b- quark into a Bc+ or a B+ meson, respectively. © 2013 CERN.

Branching fraction ; CP asymmetry of the decays B+→KS0π+ ; B+→KS0K+

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2013-01-01

Abstract

An analysis of B+→KS0π+ ; B+→KS0K+ decays is performed with the LHCb experiment. The pp collision data used correspond to integrated luminosities of 1fb-1 ; 2fb-1 collected at centre-of-mass energies of √s=7TeV ; √s=8TeV, respectively. The ratio of branching fractions ; the direct CP asymmetries are measured to be B(B+→KS0K+)/B(B+→KS0π+)=0.064±0.009 (stat.)±0.004(syst.), ACP(B+→KS0π+)=-0.022±0.025(stat.)±0.010 (syst.) ; ACP(B+→KS0K+)=-0.21±0.14 (stat.)±0.01 (syst.). The data sample taken at √s=7 TeV is used to search for Bc+→KS0K+ decays ; results in the upper limit (fcdot operatorB(Bc+→KS0K+))/(fudot operatorB(B+→KS0π+))<5.8×10-2 at 90% confidence level, where fc ; fu denote the hadronisation fractions of a b- quark into a Bc+ or a B+ meson, respectively. © 2013 CERN.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/179774
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