An angular analysis of the decay B0s → K∗0K∗0is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb−1collected 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 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 branchin fraction B(Bs → K∗(892)0K∗(892)0) is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ±0.6 (fd/fs)) × 10−6.

Measurement of CP asymmetries and polarisation fractions in Bs0→K∗0K¯∗0 decays / The LHCb collaboration, N., Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Anderson, J., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2015:7(2015). [10.1007/JHEP07(2015)166]

Measurement of CP asymmetries and polarisation fractions in Bs0→K∗0K¯∗0 decays

Capriotti, L.;Casse, G.;SARTI, ALESSIO;SCIUBBA, Adalberto;
2015

Abstract

An angular analysis of the decay B0s → K∗0K∗0is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb−1collected 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 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 branchin fraction B(Bs → K∗(892)0K∗(892)0) is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ±0.6 (fd/fs)) × 10−6.
2015
B physics; CP violation; Flavour Changing Neutral Currents; Hadron-Hadron Scattering; Polarization; Nuclear and High Energy Physics
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of CP asymmetries and polarisation fractions in Bs0→K∗0K¯∗0 decays / The LHCb collaboration, N., Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Anderson, J., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2015:7(2015). [10.1007/JHEP07(2015)166]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/836046
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