Measurement of $CP$ asymmetries and polarisation fractions in $B_s^0 \rightarrow K^*0\barK^*0$ decaysстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 марта 2016 г.
Аннотация:An angular analysis of the decay B0s→K∗0K¯¯¯¯∗0 is performed using pp collisions corresponding to an integrated luminosity of 1.0fb−1 collected by the LHCb experiment at a centre-of-mass energy s√=7TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction fL=0.201±0.057(stat.)±0.040(syst.) for the B0s→K∗(892)0K¯¯¯¯∗(892)0 decay. A large scalar contribution from the K∗0(1430) and K∗0(800) resonances is found, allowing the determination of additional CP asymmetries. Triple product and direct CP asymmetries are determined to be compatible with the Standard Model expectations. The branching fraction B(B0s→K∗(892)0K¯¯¯∗(892)0) is measured to be (10.8±2.1(stat.)±1.4(syst.)±0.6(fd/fs))×10−6.