TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Ruiz Valls, P.
AU  - Sanchez Mayordomo, C.
PY  - 2015
DA  - 2015//
TI  - Differential branching fraction and angular analysis of Lambda(0)(b) -> Lambda mu(+)mu(-) decays
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 115
EP  - 29pp
VL  - 06
IS  - 6
PB  - Springer
KW  - Rare decay
KW  - Hadron-Hadron Scattering
KW  - Branching fraction
KW  - B physics
KW  - Flavour Changing Neutral Currents
AB  - The differential branching fraction of the rare decay Lambda(0)(b) -> Lambda mu(+)mu(-) is measured as a function of q(2), the square of the dimuon invariant mass. The analysis is performed using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb(-1), collected by the LHCb experiment. Evidence of signal is observed in the q(2) region below the square of the J/psi mass. Integrating over 15 < q(2) < 20 GeV2/c(4) the differential branching fraction is measured as dB(Lambda(0)(b) -> Lambda mu(+)mu(-))/dq(2) = (1.18(-0.08)(+0.09) +/- 0.03 +/- 0.27) x 10(-7) (GeV2/c(4))(-1) where the uncertainties are statistical, systematic and due to the normalisation mode Lambda(0)(b) -> J/psi Lambda , respectively. In the q(2) intervals where the signal is observed, angular distributions are studied and the forward-backward asymmetries in the dimuon (A(FB)(l)) and hadron (A(FB)(h)) systems are measured for the first time. In the range 15 < q(2) < 20GeV(2)/c(4) they are found to be A(FB)(l) = -0.05 +/- 0.09 (stat) +/- 0.03 (syst) and A(FB)(h) = -0.29 +/- 0.07 (stat) +/- 0.03 (syst).
SN  - 1029-8479
UR  - http://arxiv.org/abs/1503.07138
UR  - https://doi.org/10.1007/JHEP06(2015)115
DO  - 10.1007/JHEP06(2015)115
LA  - English
N1  - WOS:000356955000001
ID  - LHCbCollaborationAaij_etal2015
ER  -