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Author  |
LHCb Collaboration (Aaij, R. et al); Fernandez Casani, A.; Jaimes Elles, S.J.; Jashal, B.K.; Libralon, S.; Lucio Martinez, M.; Martinez-Vidal, F.; Mazorra de Cos, J.; Oyanguren, A.; Rebollo De Miguel, M.; Sanderswood, I.; Svintozelskyi, V.; Velilla Serna, J.; Zhuo, J. |
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Title |
Precision Measurement of CP Violation and Branching Fractions in B± → KS0h± (h = π, K) Decays and Search for the Rare Decay Bc± → KS0K± |
Type |
Journal Article |
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Year |
2026 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
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Volume |
136 |
Issue |
16 |
Pages |
161801 - 14pp |
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Abstract |
The decay B-+/- -> K-S(0)pi(+/-), with a CP asymmetry expected to be close to zero in the standard model, is theoretically clean and sensitive to potential new physics. An analysis of the decays B-+/- -> K-S(0)pi(+/-) and B-+/- -> (KSK +/-)-K-0 is performed using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb(-1). The CP asymmetries are determined to be A(CP)(B-+/- -> K-S(0)pi(+/-)) = -0.028 +/- 0.009 +/- 0.009 and A(CP)(B-+/- -> (KSK +/-)-K-0) = 0.118 +/- 0.062 +/- 0.031, and the branching fraction ratio is measured to be B(B-+/- -> (KSK +/-)-K-0)/B(B-+/- -> K-S(0)pi(+/-)) = 0.055 +/- 0.004 +/- 0.002, where the first uncertainties are statistical and the second are systematic. These results are the most precise measurements of these quantities to date. A search for the rare decay B-c(+/-) -> (KSK +/-)-K-0 is also performed. No significant signal is observed, and the upper limit on the product of the branching fraction ratio B(Bc(+/-) -> (KSK +/-)-K-0)/B(B-+/- -> K-S(0)pi(+/-)) and the fragmentation-fraction ratio f(c)/f(u) is set to be 0.015 (0.016) at the 90% (95%) confidence level. |
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Address |
[Bonacci, R. B.; Dekkers, S.; Egede, U.; Hadavizadeh, T.; Harris, T. H.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Lobo, I.; Monk, M.; Song, R.; Walton, E. J.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia |
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Publisher |
Amer Physical Soc |
Place of Publication |
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Language |
English |
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Original Title |
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Series Title |
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Series Volume |
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Edition |
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ISSN |
0031-9007 |
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Notes |
WOS:001777138000001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7267 |
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