A measurement of the CP asymmetry in B+→K +μ+μ- decays is presented using pp collision data, corresponding to an integrated luminosity of 1.0 fb -1, recorded by the LHCb experiment during 2011 at a center-of-mass energy of 7 TeV. The measurement is performed in seven bins of μ+μ- invariant mass squared in the range 0.05<22.00 GeV2/c4, excluding the J/ψ and ψ(2S) resonance regions. Production and detection asymmetries are corrected for using the B +→J/ψK+ decay as a control mode. Averaged over all the bins, the CP asymmetry is found to be ACP=0.000±0.033 (stat)±0.005 (syst)±0.007 (J/ψK), where the third uncertainty is due to the CP asymmetry of the control mode. This is consistent with the standard model prediction. © 2013 CERN. Published by the American Physical Society under the terms of the http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Measurement of the CP asymmetry in B+→K+μ +μ- decays
Albrecht J.;Alessio F.;Alexander M.;Amerio S.;Anderson J.;Barlow R. J.;Bauer T.;Bedeschi F.;Bondar A.;Bowen E.;Cadeddu S.;Charles M.;Chen P.;Contu A.;Corti G.;Di Canto A.;Frank M.;Frosini M.;Gandini P.;Gersabeck M.;Gotti C.;He J.;Lazzeroni C.;Leo S.;Luo H.;Mancinelli G.;Marino P.;Matteuzzi C.;Moran D.;Morello M. J.;Patel M.;Penso G.;Perret P.;Punzi G.;Ruffini F.;Sabatino G.;Serra N.;Smith E.;Smith M.;Thomas E.;Veltri M.;Vollhardt A.;Wallace R.;Wilkinson G.;Williams M.;Wu S.;Xing Z.;Yang Z.;Young R.;
2013-01-01
Abstract
A measurement of the CP asymmetry in B+→K +μ+μ- decays is presented using pp collision data, corresponding to an integrated luminosity of 1.0 fb -1, recorded by the LHCb experiment during 2011 at a center-of-mass energy of 7 TeV. The measurement is performed in seven bins of μ+μ- invariant mass squared in the range 0.05<22.00 GeV2/c4, excluding the J/ψ and ψ(2S) resonance regions. Production and detection asymmetries are corrected for using the B +→J/ψK+ decay as a control mode. Averaged over all the bins, the CP asymmetry is found to be ACP=0.000±0.033 (stat)±0.005 (syst)±0.007 (J/ψK), where the third uncertainty is due to the CP asymmetry of the control mode. This is consistent with the standard model prediction. © 2013 CERN. Published by the American Physical Society under the terms of the http://creativecommons.org/licenses/by/3.0/ Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.