Recent BaBar Results on CP Violation in B Decays PDF Download
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Languages : en
Pages : 5
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![BABAR Results on CP Violation in the B[sup 0] System PDF](https://books.google.com/books/content/images/frontcover/P9DLjwEACAAJ?fife=w80-h100)
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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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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.
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The BABAR detector at the PEP-II asymmetric B Factory at SLAC collected a sample of 23 x 10[sup 6] B[bar B] pairs in the years 1999 and 2000. Using this data sample, we measure the amplitude of the time-dependent CP-violating asymmetry in neutral B decays to the CP eigenstates J/[psi] K[sub S][sup 0], [psi](2S) K[sub S][sup 0] and J/[psi] K[sub L][sup 0]. We find a value of sin2[beta]= 0.34[+-] 0.20(stat)[+-] 0.05(syst). We also present preliminary measurements of the B[sup 0][bar B][sup 0] oscillation frequency and of the lifetimes of charged and neutral B mesons.
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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?(4S) resonance. The measurement of sin2? = 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? level. In addition, preliminary results on CP-violating asymmetries in the decay channel B° →??− 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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We present results on time-dependent CP asymmetries in neutral B decays. The measurements use a data sample of about 88 million[Upsilon](4S)[yields] B[bar B] decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state and the other B meson is determined to be either a B[sup 0] or[bar B][sup 0] from its decay products. Final states considered include B[sup 0][yields] J/[psi]K[sub S][sup 0], B[sup 0][yields] J/[psi]K[sub L][sup 0], B[sup 0][yields] J/[psi][pi][sup 0], B[sup 0][yields] D*[sup+] D*[sup -], B[sup 0][yields][phi]K[sub S][sup 0], B[sup 0][yields][pi][sup+][pi][sup -], and B[sup 0][yields][rho][sup[+-]][pi][sup[-+]].
