Recent Results on CP Violation From BABAR. PDF Download
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The BABAR experiment at the PEP-II B factory at SLAC has collected over 37 106 BB pairs in the years 2000 and 2001. Based on this data sample, various studies of CP violation in the B system are presented, including the first observation of CP violation outside the kaon system and a measurement of the CKM parameter sin(2[beta]) = 0.59 ± 0.14(stat) ± 0.05(syst). Studies on direct CP violation and CP violation in mixing are also presented.
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Languages : en
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The BABAR experiment at the PEP-II B factory at SLAC has collected over 37 106 BB pairs in the years 2000 and 2001. Based on this data sample, various studies of CP violation in the B system are presented, including the first observation of CP violation outside the kaon system and a measurement of the CKM parameter sin(2[beta]) = 0.59 ± 0.14(stat) ± 0.05(syst). Studies on direct CP violation and CP violation in mixing are also presented.
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Languages : en
Pages : 5
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Languages : en
Pages : 7
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We review recent time-dependent measurements in the B meson sector based on data collected between 1999 and 2002 by the BABAR detector, which correspond to approximately 88 millions B-Bbar pairs. These results were presented at the Rencontres de Moriond, Electroweak Interactions and Unified Theories in March 2003.
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The BABAR detector, operating at the SLAC PEP-II asymmetric B Factory, has collected a sample of 32 million B[bar B] pairs by May 2001, at energies close to the[Upsilon](4S) resonance. The measurement of sin2[beta]= 0.59[+-] 0.14(stat)[+-] 0.05(syst), performed with a study of time-dependent CP-violating asymmetries in neutral B decays, establishes CP violation at the 4[sigma] level. In addition, preliminary results on CP-violating asymmetries in the decay channel B[sup 0][yields][pi][sup+][pi][sup -] are presented.
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The most recent results obtained by the BABAR experiment at the PEP-II asymmetric-energy B Factory at SLAC on CP-violating asymmetries and branching fractions for neutral and charged B decays are presented here. The analysis was performed on a data sample of[approx] 88 million[Upsilon](4S)[yields] B[bar B] decays collected between 1999 and 2002. Using b[yields] c[bar c]s decays, we measure sin2[beta]= 0.741[+-] 0.067(stat)[+-] 0.034(syst). We also present sin2[beta] measurements from, b[yields] s[bar s]s and b[yields] c[bar c]d processes. From neutral B meson decays to two-body final states of charged pions and kaons, we derive for the CP violating parameters, S[sub[pi][pi]]= 0.02[+-] 0.34[+-] 0.05[-0.54,+0.58] and C[sub[pi][pi]]= -0.30[+-] 0.25[+-] 0.04[-0.72,+0.12]. First results for B[yields][pi][sup+][pi][sup -][pi][sup 0] and K[sup[+-]][pi][sup[-+]][pi][sup 0] final states dominated by the[rho][sup[+-]] resonance, are also presented.
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The authors present a preliminary measurement of time-dependent CP-violating asymmetries in B[sup 0][yields] J/[psi]K[sub s][sup 0] and B[sup 0][yields][psi](2S)K[sub s][sup 0] decay recorded by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. The data sample consists of 9.0 fb[sup -1] collected at the[Upsilon](4S) resonance and 0.8 fb[sup -1] off-resonance. One of the neutral B mesons, produced in pairs at the[Upsilon](4S), is fully reconstructed. The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. The time difference between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities and the time resolution function are measured with samples of fully-reconstructed semileptonic and hadronic neutral B final states. The value of the asymmetry amplitude, sin2[beta], is determined from a maximum likelihood fit to the time distribution of 120 tagged B[sup 0][yields] J/[psi]K[sub s][sup 0] and B[sup 0][yields][psi](2S)K[sub s][sup 0] candidates: sin2[beta]= 0.12[+-] 0.37 (stat)[+-] 0.09 (syst).
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Languages : en
Pages : 9
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Results of recent searches for new physics in CP violation in charm decays from the BABAR experiment are presented. These results include a measurement of D0 - anti D0 mixing and searches for CP violation in two-body D0 decays, a search for CP violation in the charm decays D" 2!KS0K " and D s" 2!KS0K", KS0[pi]", and a search for direct CP violation in the singly-Cabibbo suppressed D" 2!K+K-[pi]"decays. These studies are based on the fi nal dataset collected by BABAR at the PEP-II B factory at SLAC in the period 1999-2008. No evidence of CP violation is found in these charm decays. The measured mixing parameter yCP = [0.72 " 0.18(stat) " 0.12(syst)]% excludes the no-mixing null hypothesis with a signifi cance of 3.3[sigma].
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Pages : 8
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In the present paper we review recent experimental results from the BABAR experiment concerning the measurement of the CKM angles. A particular highlight is given to the novel independent determination of the angle [alpha] from B° → a1(1260){sup {+-}}[pi]{sup {-+}} and to the recent full-luminosity updates of several angle [gamma] measurements.
