TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
PY  - 2022
DA  - 2022//
TI  - Measurement of the photon polarization in Lambda(0)(b) -> Lambda gamma decays
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - L051104 - 11pp
VL  - 105
IS  - 5
PB  - Amer Physical Soc
AB  - The photon polarization in b -> s gamma transitions is measured for the first time in radiative b -baryon decays exploiting the unique spin structure of Lambda(0)(b)-> Lambda(gamma) decays. A data sample corresponding to an integrated luminosity of 6 fb(-1) collected by the LHCb experiment in pp collisions at a center-of-mass energy of 13 TeV is used. The photon polarization is measured to be alpha(gamma) = 0.82(-0.26-0.)(13)(+)(0.17+0.04), where the first uncertainty is statistical and the second systematic. This result is in agreement with the Standard Model prediction and previous measurements in b-meson decays. Charge-parity breaking effects are studied for the first time in this observable and found to be consistent with CP symmetry.
SN  - 2470-0010
UR  - https://arxiv.org/abs/2111.10194
UR  - https://doi.org/10.1103/PhysRevD.105.L051104
DO  - 10.1103/PhysRevD.105.L051104
LA  - English
N1  - WOS:000788392400005
ID  - LHCbCollaborationAaij_etal2022
ER  -