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Title:
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Measurement of CP asymmetries and polarisation fractions in B0s→K∗0K¯¯¯¯¯∗0 decays
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Author:
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Badalov, Alexey; Calvo Gómez, Míriam; Vilasís Cardona, Xavier; LHCb Collaboration - CERN
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Other authors:
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Universitat Ramon Llull. La Salle; CERN |
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Abstract:
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An angular analysis of the decay B0s→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 f L = 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(Bs→K∗(892)0K¯¯¯¯¯∗(892)0) is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (f d /f s )) × 10−6. |
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Publication date:
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2015-07-30 |
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Subject (UDC):
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539 - Constitució física de la matèria |
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Subject(s):
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Gran col·lisionador d'hadrons (França i Suïssa)
Partícules (Física nuclear)
Col·lisions (Física nuclear) |
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Rights:
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L'accés als continguts d'aquest document queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons:http://creativecommons.org/licenses/by/4.0/
© CERN |
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Pages:
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28 p. |
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Document type:
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Article
Article - Published version |
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DOI:
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https://doi.org/10.1007/JHEP07(2015)166
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Published by:
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Springer
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Publish at:
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Journal of High Energy Physics, 2015, Vol. 2015, No.7 (Juliol)
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Share:
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