Measurement of CP asymmetries and polarisation fractions in B_s^0→K^∗ 0K^∗ 0 decays
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Vazquez Gomez,P. Vazquez Regueiro,C. Vázquez Sierra,S. Vecchi, J. J. Velthuis,M. Veltri,G. Veneziano,M. Vesterinen,J. V. Viana Barbosa, B. Viaud, D. Vieira,M. Vieites Diaz,X. Vilasis-Cardona, A. Vollhardt, D. Volyanskyy, D. Voong, A. Vorobyev,V. Vorobyev, C. Voß,J. A. de Vries, R. Waldi,C. Wallace,R. Wallace, J. Walsh, S. Wandernoth,J. Wang, D. R. Ward, N. K. Watson,D. Websdale,M. Whitehead, D. Wiedner,G. Wilkinson,M. Wilkinson,M. P. Williams,M. Williams, H. W. Wilschut, F. F. Wilson,J. Wimberley, J. Wishahi,W. Wislicki,M. Witek,G. Wormser, S. A. Wotton,S. Wright, K. Wyllie,Y. Xie,Z. Xing, Z. Xu, Z. Yang,X. Yuan, O. Yushchenko,M. Zangoli, M. Zavertyaev,L. Zhang,W. C. Zhang, Y. Zhang, A. Zhelezov, A. Zhokhov,L. Zhong
Journal of High Energy Physics（2015）
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摘要
An angular analysis of the decay B_s^0→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 B_s^0→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(B_s→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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关键词
polarization,cp violation
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