Measurement of CP violation parameters in B0->D K*0 decays
LHCb collaboration: R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z., Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G., Alkhazov, P. Alvarez Cartelle, A.A. Alves Jr, S. Amato, S. Amerio, Y. Amhis,, L. An, L. Anderlini, J. Anderson, R. Andreassen, M. Andreotti
TL;DR
This paper reports a precise measurement of CP violation parameters in B0->D K*0 decays using LHCb data, focusing on amplitude ratios and CP asymmetries across multiple decay channels.
Contribution
It provides the most accurate determination to date of the amplitude ratio rB(DK*0) in B0 decays involving D mesons and K*0, enhancing understanding of CP violation.
Findings
Most precise measurement of rB(DK*0) to date.
Observation of CP asymmetries in B0->D K*0 decays.
Detailed analysis across multiple D decay final states.
Abstract
An analysis of B0->D K*0 decays is presented, where D represents an admixture of D0 and D0b mesons reconstructed in four separate final states: K-pi+, pi-K+, K+K- and pi+pi-. The data sample corresponds to 3.0fb-1 of proton-proton collision, collected by the LHCb experiment. Measurements of several observables are performed, including CP asymmetries. The most precise determination is presented of rB(DK*0), the magnitude of the ratio of the amplitudes of the decay B0->D K+ pi- with a b->u or a b->c transition, in a K pi mass region of +/-50 MeV/c2 around the K*(892) mass and for an absolute value of the cosine of the K*0 helicity angle larger than 0.4.
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