Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons
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Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons

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Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons

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dc.contributor.author BABAR Collaboration
dc.contributor.author Martínez Vidal, Fernando
dc.contributor.author Oyanguren Campos, Arantza
dc.date.accessioned 2014-04-01T09:06:29Z
dc.date.available 2014-04-01T09:06:29Z
dc.date.issued 2013
dc.identifier.uri http://dx.doi.org/10.1103/PhysRevD.87.052009
dc.identifier.uri http://hdl.handle.net/10550/33918
dc.description.abstract We present improved measurements of CP-violation parameters in the decays B-0 -> pi(+)pi(-), B-0 -> K+pi(-), and B-0 -> pi(0)pi(0), and of the branching fractions for B-0 -> pi(0)pi(0) and B-0 -> K-0 pi(0). The results are obtained with the full data set collected at the Upsilon(4S) resonance by the BABAR experiment at the PEP-II asymmetric-energy B factory at the SLAC National Accelerator Laboratory, corresponding to (467 +/- 5) x 10(6) B (B) over bar pairs. We find the CP-violation parameter values and branching fractions: S pi+pi- = -0.68 +/- 0.10 +/- 0.03, C-pi+pi(-) = -0.25 +/- 0.08 +/- 0.02, A(K+pi-) = -0.107 +/- 0.016(-0.004)(+0.006), C pi(0)pi(0) = -0.43 +/- 0.26 +/- 0.05, B(B-0 -> pi(0)pi(0)) = (1.83 +/- 0.21 +/- 0.13) x 10(-6), B(B-0 -> pi(0)pi(0)) = (10.1 +/- 0.6 +/- 0.4) x 10(-6), where in each case, the first uncertainties are statistical and the second are systematic. We observe CP violation with a significance of 6.7 standard deviations for B-0 -> pi(+)pi(-) and 6.1 standard deviations for B-0 -> K+pi(-), including systematic uncertainties. Constraints on the unitarity triangle angle alpha are determined from the isospin relations among the B -> pi pi rates and asymmetries. Considering only the solution preferred by the Standard Model, we find alpha to be in the range [71 degrees,109 degrees] at the 68% confidence level.
dc.relation.ispartof Physical Review D, 2013, vol. 87, num. 5, p. 052009-1-052009-16
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source BABAR Collaboration Martínez Vidal, Fernando Oyanguren Campos, Arantza 2013 Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons Physical Review D 87 5 052009-1 052009-16
dc.subject Física nuclear
dc.subject Violació CP (Física nuclear)
dc.title Measurement of CP asymmetries and branching fractions in charmless two-body B-meson decays to pions and kaons
dc.type info:eu-repo/semantics/article
dc.date.updated 2014-04-01T09:06:29Z
dc.identifier.doi http://dx.doi.org/10.1103/PhysRevD.87.052009
dc.identifier.idgrec 084160

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