Measurements of CP-violating Asymmetries in B0 -] Ks Pi0 Decays PDF Download
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![Measurements of CP-violating Asymmetries in B0 -] Ks Pi0 Decays PDF](https://books.google.com/books/content/images/frontcover/t8IBkAEACAAJ?fife=w150-h200)
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Languages : en
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We present a measurement of the time-dependent CP-violating (CPV) asymmetries in B[sup 0] [yields] K[sub s][sup 0][pi][sup 0] decays based on 124 million [Upsilon](4S) [yields] B[bar B] decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. In a sample containing 122 [+-] 16 signal decays, we obtain the magnitude of the direct CPV asymmetry C[sub K[sub S][sup 0][pi][sup 0]] = 0.40 [sub -0.28][sup +0.27] [+-] 0.09 and the magnitude of the CPV asymmetry in the interference between mixing and decay S[sub K[sub S][sup 0][pi][sup 0]] = 0.48 [sub -0.47][sup +0.38] [+-] 0.06 where the first error is statistical and the second systematic.
![Measurements of CP-violating Asymmetries in B0 -] Ks Pi0 Decays PDF](https://books.google.com/books/content/images/frontcover/t8IBkAEACAAJ?fife=w80-h100)
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Languages : en
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Book Description
We present a measurement of the time-dependent CP-violating (CPV) asymmetries in B[sup 0] [yields] K[sub s][sup 0][pi][sup 0] decays based on 124 million [Upsilon](4S) [yields] B[bar B] decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. In a sample containing 122 [+-] 16 signal decays, we obtain the magnitude of the direct CPV asymmetry C[sub K[sub S][sup 0][pi][sup 0]] = 0.40 [sub -0.28][sup +0.27] [+-] 0.09 and the magnitude of the CPV asymmetry in the interference between mixing and decay S[sub K[sub S][sup 0][pi][sup 0]] = 0.48 [sub -0.47][sup +0.38] [+-] 0.06 where the first error is statistical and the second systematic.
![Measurement of CP Asymmetries in B0-]Ks Pi0 Pi0 Decays PDF](https://books.google.com/books/content/images/frontcover/Tt6zAQAACAAJ?fife=w80-h100)
Author: J. C. Chen
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Languages : en
Pages : 17
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The authors present a preliminary measurement of the time-dependent CP asymmetry for the neutral B-meson decay into the CP = +1 final state K{sub S}{sup 0}{pi}{sup 0}{pi}{sup 0}, with K{sub S}{sup 0} {yields} {pi}{sup +}{pi}{sup -} and {pi}{sup 0} {yields} {gamma}{gamma}. They use a sample of approximately 227 million B-meson pairs recorded at the {Upsilon}(4S) resonance by the BABAR detector at the PEP-II B-Factory at SLAC. From a maximum likelihood fit they extract the mixing-induced CP-violation parameter S{sub K{sub S}{sup 0}{pi}{sup 0}{pi}{sup 0}} = 0.84 {+-} 0.71(stat) {+-} 0.08(syst) and the direct CP-violation parameter C{sub K{sub S}{sup 0}}{pi}{sup 0}{pi}{sup 0} = 0.27 {+-} 0.52(stat) {+-} 0.13(syst), where the first uncertainty is statistical and the second systematic.
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Languages : en
Pages : 5
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We present measurements of time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates. The measurement uses a data sample of 23 million [Upsilon](4S) → B{bar B} decays collected by the BABAR detector at the PEP-II asymmetric B Factory at SLAC. In this sample, we find events where one neutral B meson is fully reconstructed in a CP eigenstate containing charmonium and the flavor of the other neutral B meson is determined from its decay products. The amplitude of the CP-violating asymmetry, which in the Standard Model is proportional to sin2[beta], is derived from the decay time distributions in such events. The result is sin2[beta] = 0.34 ± 0.20 (stat) ± 0.05 (syst).
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Languages : en
Pages : 8
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We present a measurement of the time-dependent CP asymmetry for the neutral B-meson decay into the CP = +1 final state K{sub S}°?°?°, with K{sub S}° →??−. We use a sample of approximately 227 million B-meson pairs recorded at the?(4S) resonance with the BABAR detector at the PEP-II B-Factory at SLAC. From an unbinned maximum likelihood fit we extract the mixing-induced CP-violation parameter S = 0.72 ± 0.71 ± 0.08 and the direct CP-violation parameter C = 0.23 ± 0.52 ± 0.13, where the first uncertainty is statistical and the second systematic.
![Measurement of CP Asymmetries and Branching Fractions in B0 -] Pi+ Pi-, B0 -] K+ Pi-, B0 -] Pi0 Pi0, B0 -] K0 Pi0 and Isospin Analysis of B -] Pi Pi Decays PDF](https://books.google.com/books/content/images/frontcover/1tjWwQEACAAJ?fife=w80-h100)
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Languages : en
Pages : 27
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The authors present preliminary results of improved measurements of the CP-violating asymmetries and branching fractions in the decays B° →??−, B° → K+?−, B° →?°?°, and B° → K°?°. This update includes all data taken at the?(4S) resonance by the BABAR experiment at the asymmetric PEP-II B-meson factory at SLAC, corresponding to 467 ± 5 million B{bar B} pairs. They find S{sub??} = -0.68 ± 0.10 ± 0.03, C{sub??} = -0.25 ± 0.08 ± 0.02,?{sub K{sub?}} = -0.107 ± 0.016{sub -0.004}, {sup +0.006}, C{sub?°?°} = -0.43 ± 0.26 ± 0.05,?(B° →?°?°) = (1.83 ± 0.21 ± 0.13) x 10−6,?(B° → K°?°) = (10.1 ± 0.6 ± 0.4) x 10−6, where the first error is statistical and the second is systematic. They observe CP violation with a significance of 6.7? in B° → {pi}− and 6.1? in B° → K+{pi}−. Constraints on the Unitarity Triangle angle? are determined from the isospin relation between all B → {pi}{pi} rates and asymmetries.
Author: B. Aubert
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Languages : en
Pages : 32
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We report a measurement of CP-violating asymmetries in B{sup 0} {yields} ({rho}{pi}){sup 0} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup 0} decays using a time-dependent Dalitz plot analysis. The results are obtained from a data sample of 347 million {Upsilon}(4S) {yields} B{bar B} decays, collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure 26 coefficients of the bilinear form factor terms occurring in the time-dependent decay rate of the B{sup 0} meson and derive the physically relevant quantities from these coefficients. In particular we find a three standard deviation evidence of direct CP-violation in the B{sup 0} {yields} {rho}{sup {+-}}{pi}{sup {-+}} decays, with systematic uncertainties included. We also achieve a constraint of the angle {alpha} of the Unitarity Triangle. All results presented are preliminary.
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Languages : en
Pages : 23
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We report a measurement of CP-violating asymmetries in B° → (??)° →??−?° decays using a time-dependent Dalitz plot analysis. The results are obtained from a data sample of 375 million?(4S) → B{bar B} decays, collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure 26 coefficients of the bilinear form-factor terms occurring in the time-dependent decay rate of the B° meson. We derive the physically relevant quantities from these coefficients. In particular, we measure a constraint on the angle? of the Unitarity Triangle.
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Languages : en
Pages : 4
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The authors present measurements of CP-violating asymmetries in the decays B° → a1{sup ±}(1260)[pi]{sup {-+}} with a1{sup ±}(1260) → [pi]{sup {-+}}[pi]{sup ±}[pi]{sup ±}. The data sample corresponds to 384 x 106 B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric B-factory at SLAC. They measure the time- and flavor-integrated charge asymmetry A{sub CP}{sup 1{sub 1}±} = -0.07 ± 0.07 ± 0.02, the mixing-induced CP violation parameter S{sub a{sub 1}[pi]} = 0.37 ± 0.21 ± 0.07, the direct CP violation parameter C{sub a{sub 1}[pi]} = -0.10 ± 0.15 ± 0.09, and the parameter [Delta]C{sub a{sub 1}[pi]} = 0.26 ± 0.15 {+-} 0.07 and [Delta]S{sub a{sub 1}[pi]} = -0.14 {+-} 0.21 {+-} 0.06. From these measured quantities they extract the angle [alpha]{sub eff} = 78.6{sup o} {+-} 7.3{sup o}.
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Languages : en
Pages : 7
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The authors analyze the decay B° 2!KK−K° using 383 million B{bar B} events collected by the BABAR detector at SLAC to extract CP violation parameter values over the Dalitz plot. Combining all KK−K° events, they find A{sub CP} = -0.015 ± 0.077 ± 0.053 and [beta]{sub eff} = 0.352 ± 0.076 ± 0.026 rad, corresponding to a CP violation significance of 4.8[sigma]. A second solution near [pi]/2 - [beta]{sub eff} is disfavored with a significance of 4.5[sigma]. They also report A{sub CP} and [beta]{sub eff} separately for decays to [phi](1020)K°, f0(980)K°, and K+K−K° with m{sub K{sup +}K−}> 1.1 GeV/c2.
![Measurement of Time-Dependent CP-Violating Asymmetries in B0 -]K*0 Gamma (K*0-]K0{sub S} Pi0) Decays PDF](https://books.google.com/books/content/images/frontcover/2q1JAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 8
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Book Description
We present a measurement of the time-dependent CP-violating asymmetries in B° → K*°[gamma](K*° → K{sub S}°[pi]°) decays based on 124 million [Upsilon](4S) → B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at the Stanford Linear Accelerator Center. In a sample containing 105 ± 14 signal decays, we measure S{sub K*{sub {gamma}}} = 0.25 ± 0.63 ± 0.14 and C{sub K*{sub {gamma}}} = -0.57 ± 0.32 ± 0.09, where the first error is statistical and the second systematic.
