The direct CP asymmetries of the decays B0 → K*0μ+μ− ; B+ → K+μ+μ− are measured using pp collision data corresponding to an integrated luminosity of 3.0 fb−1 collected with the LHCb detector. The respective control modes B0 → J/ψK*0 ; B+ → J/ψK+ are used to account for detection ; production asymmetries. The measurements are made in several intervals of μ+μ− invariant mass squared, with the ϕ(1020) ; charmonium resonance regions excluded. Under the hypothesis of zero CP asymmetry in the control modes, the average values of the asymmetries are (Formula Presented) where the first uncertainties are statistical ; the second are due to systematic effects. Both measurements are consistent with the Standard Model prediction of small CP asymmetry in these decays. © 2014, The Author(s).
Measurement of CP asymmetries in the decays B 0 → K*0μ+μ− ; B+ → K+μ+μ−
PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2014-01-01
Abstract
The direct CP asymmetries of the decays B0 → K*0μ+μ− ; B+ → K+μ+μ− are measured using pp collision data corresponding to an integrated luminosity of 3.0 fb−1 collected with the LHCb detector. The respective control modes B0 → J/ψK*0 ; B+ → J/ψK+ are used to account for detection ; production asymmetries. The measurements are made in several intervals of μ+μ− invariant mass squared, with the ϕ(1020) ; charmonium resonance regions excluded. Under the hypothesis of zero CP asymmetry in the control modes, the average values of the asymmetries are (Formula Presented) where the first uncertainties are statistical ; the second are due to systematic effects. Both measurements are consistent with the Standard Model prediction of small CP asymmetry in these decays. © 2014, The Author(s).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.