Journal Article

Measurement of the CKM angle γ using B0→DK∗0 with D→K0Sπ+π− decays

Lefèvre, R., Beaucourt, L., Leroy, O., Chefdeville, M., Perret, P., Kanso, W., Grabalosa Gándara, M., Serrano, J., Baalouch, M., De Bruyn, K., Deschamps, O., Aaij, R., Maratas, J., Decamp, D., Kozeiha, M., Lees, J.-P., El Rifai, I., Aslanides, E., Tournefier, E., Hoballah, M., Ajaltouni, Z.J., Akar, S., Tisserand, V., Niess, V., Mordà, A., Cogneras, E., Ghez, P., Tsaregorodtsev, A., Marchand, J.-F., Mancinelli, G., Henrard, P., Tayduganov, A., t'Jampens, S., Monteil, S., Cogan, J., Legac, R., Gazzoni, G., Déléage, N., Minard, M.-N., Martin, M., Pietrzyk, B.

2016

Overview

A model-dependent amplitude analysis of the decay B0→D(K0Sπ+π−)K∗0 is performed using proton-proton collision data corresponding to an integrated luminosity of 3.0fb−1, recorded at s√=7 and 8TeV by the LHCb experiment. The CP violation observables x± and y±, sensitive to the CKM angle γ, are measured to bex−=−0.15±0.14±0.03±0.01,y−=0.25±0.15±0.06±0.01,x+=0.05±0.24±0.04±0.01,y+=−0.65+0.24−0.23±0.08±0.01,where the first uncertainties are statistical, the second systematic and the third arise from the uncertainty on the D→K0Sπ+π− amplitude model. These are the most precise measurements of these observables. They correspond to γ=(80+21−22)∘ and rB0=0.39±0.13, where rB0 is the magnitude of the ratio of the suppressed and favoured B0→DK+π− decay amplitudes, in a Kπ mass region of ±50MeV around the K∗(892)0 mass and for an absolute value of the cosine of the K∗0 decay angle larger than 0.4.

• Publisher: Springer
• Subject: High Energy Physics - Experiment / Physics