2024-03-28T20:52:34Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1262542016-02-18T03:47:18Zcom_10261_61com_10261_4col_10261_314
DIGITAL.CSIC
author
LHCb Collaboration
author
Aaij, R.
author
Oyanguren, Arantza
author
Ruiz Valls, Pablo
funder
Generalitat de Catalunya
2015-12-01T09:26:18Z
2015-12-01T09:26:18Z
2013-06-21
Physical Review - Section D - Particles and Fields 87 (11): 112010 - 21 (2013)
1550-7998
http://hdl.handle.net/10261/126254
10.1103/PhysRevD.87.112010
1550-2368
http://dx.doi.org/10.13039/501100002809
The time-dependent CP asymmetry in B-s(0) -> J/psi K+ K- decays is measured using pp collision data at root s = 7 TeV, corresponding to an integrated luminosity of 1: 0 fb(-1), collected with the LHCb detector. The decay-time distribution is characterized by the decay widths Gamma(L) and Gamma(H) of the light and heavy mass eigenstates of the B-s(0) - (B) over barB(s)(0) system and by a CP-violating phase s. In a sample of 27 617 B-s(0) -> J/psi K+ K- decays, where the dominant contribution comes from B-s(0) -> J/psi K+ K- decays, these parameters are measured to be phi(s) = 0. 07 +/- 0.09(stat) +/- 0. 01(syst) rad, Gamma(s) equivalent to (Gamma(L) + Gamma(L))/2 = 0.663 +/- 0.005(stat) +/- 0.006(syst) ps(-1), and 0.006(syst) ps(-1), and Delta Gamma(s) equivalent to Gamma(L) - Gamma(L) = 0.100 +/- 0.016(stat) +/- 0.003(syst) ps(-1), corresponding to the single most precise determination of phi(s), Delta Gamma(s), and Gamma(s.). The result of performing a combined analysis with B-s(0) -> J/psi pi(+) pi(-) decays gives phi(s) = 0.01 +/- 0.07(stat) +/- 0.01(syst)rad, Gamma(s) = 0.661 +/- 0.004(stat) +/- 0.006(syst) ps(-1), and Delta Gamma(s) = 0.106 +/- 0.011(stat) +/- 0.007(syst) ps(-1). All measurements are in agreement with the Standard Model predictions.
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Measurement of CP violation and the B-s(0) meson decay width difference with B-s(0) -> J/psi K+K- and B-s(0) -> J/psi pi(+) pi(-)decays
artÃculo
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URL
https://digital.csic.es/bitstream/10261/126254/1/Measurement%20of%20CP.pdf
File
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Measurement of CP.pdf
URL
https://digital.csic.es/bitstream/10261/126254/4/Measurement%20of%20CP.pdf.txt
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Measurement of CP.pdf.txt