An angular analysis of the decay B0s → K∗0 anti-K∗0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb^−1 collected by the LHCb experiment at a centre-of-mass energy √s = 7 TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction f_L = 0.201 ± 0.057(stat.) ± 0.040(syst.) for the B0s → K∗(892)0 anti-K∗(892)0 decay. A large scalar contribution from the K0∗(1430) and K0∗(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(Bs → K∗(892)0 anti-K∗(892)0) is measured to be (10.8 ± 2.1(stat.) ± 1.4(syst.) ± 0.6(f_d/f_s)) × 10^−6.

Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2015). Measurement of CP Asymmetries and Polarisation Fractions in B0s → K∗0 anti-K∗0 Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2015(7), 0-27 [10.1007/JHEP07(2015)166].

Measurement of CP Asymmetries and Polarisation Fractions in B0s → K∗0 anti-K∗0 Decays

Capriotti, L.;CARBONE, ANGELO;GALLI, DOMENICO;MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2015

Abstract

An angular analysis of the decay B0s → K∗0 anti-K∗0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb^−1 collected by the LHCb experiment at a centre-of-mass energy √s = 7 TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction f_L = 0.201 ± 0.057(stat.) ± 0.040(syst.) for the B0s → K∗(892)0 anti-K∗(892)0 decay. A large scalar contribution from the K0∗(1430) and K0∗(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(Bs → K∗(892)0 anti-K∗(892)0) is measured to be (10.8 ± 2.1(stat.) ± 1.4(syst.) ± 0.6(f_d/f_s)) × 10^−6.
2015
Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2015). Measurement of CP Asymmetries and Polarisation Fractions in B0s → K∗0 anti-K∗0 Decays. JOURNAL OF HIGH ENERGY PHYSICS, 2015(7), 0-27 [10.1007/JHEP07(2015)166].
Aaij, R.; Adeva, B.; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Cartelle, P...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/515463
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