Abstract: An angular analysis of the decay Bs0→K∗0K¯∗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 fL = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) 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 ℬBs→K∗8920K¯∗8920 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, C., 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), pp. N/A-N/A. [10.1007/JHEP07(2015)166]

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

Bizzeti A.;
2015

Abstract

Abstract: An angular analysis of the decay Bs0→K∗0K¯∗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 fL = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) 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 ℬBs→K∗8920K¯∗8920 is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (fd/fs)) × 10−6.
2015
Inglese
2015
7
N/A
N/A
B physics; CP violation; Flavour Changing Neutral Currents; Hadron-Hadron Scattering; Polarization
open
info:eu-repo/semantics/article
Contributo su RIVISTA::Articolo su rivista
262
Measurement of CP asymmetries and polarisation fractions in Bs0→K∗0K¯∗0 decays / The Lhcb, C., 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), pp. N/A-N/A. [10.1007/JHEP07(2015)166]
The Lhcb, Collaboration; Aaij, R.; Adeva, B.; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; ...espandi
708
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1209555
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