Improved Measurement of the CKM Angle Alpha Using B0 to Rho+rho- Decays PDF Download
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Languages : en
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![Updated Measurement of the CKM Angle Alpha Using B0-]rho+rho- Decays PDF](https://books.google.com/books/content/images/frontcover/9v2-DAEACAAJ?fife=w80-h100)
Author: B. Aubert
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Languages : en
Pages : 21
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The authors present results from an analysis of B{sup 0} {yields} {rho}{sup +}{rho}{sup -} using 316 fb{sup -1} of {Upsilon}(4S) {yields} B{bar B} decays observed with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. They measure the B{sup 0} {yields} {rho}{sup +}{rho}{sup -} branching fraction, longitudinal polarization fraction f{sub L}, and the CP-violating parameters S{sub long} and C{sub long}: {Beta}(B{sup 0} {yields} {rho}{sup +}{rho}{sup -}) = (23.5 {+-} 2.2(stat) {+-} 4.1(syst)) x 10{sup -6}, f{sub L} = 0.977 {+-} 0.024(stat){sub -0.013}{sup +0.015}(syst), S{sub long} = -0.19 {+-} 0.21(stat){sub -0.07}{sup +0.05}(syst), C{sub long} = -0.07 {+-} 0.15(stat) {+-} 0.06(syst). Using an isospin analysis of B {yields} {rho}{rho} decays they determine the angle {alpha} of the unitarity triangle. One of the two solutions, {alpha} [74,117]{sup o} at 68% CL, is compatible with the standard model. All results presented here are preliminary.
Author: Attila Mihalyi
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Languages : en
Pages : 198
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![Expected Accuracy in a Measurement of the CKM Angle Alpha Using a Dalitz Plot Analysis of B0 ---] Rho Pi Decays in the BTeV Project PDF](https://books.google.com/books/content/images/frontcover/nFa4AQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 26
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A precise measurement of the angle [alpha] in the CKM triangle is very important for a complete test of Standard Model. A theoretically clean method to extract [alpha] is provided by B° → [rho][pi] decays. Monte Carlo simulations to obtain the BTeV reconstruction efficiency and to estimate the signal to background ratio for these decays were performed. Finally the time-dependent Dalitz plot analysis, using the isospin amplitude formalism for tre and penguin contributions, was carried out. It was shown that in one year of data taking BTeV could achieve an accuracy on [alpha] better than 5{sup o}.
![Measurement of the Branching Fraction, Polarization, and CP Asymmetries in B0-]rho0rho0 Decay, and Implications for the CKM Angle Alpha PDF](https://books.google.com/books/content/images/frontcover/yqldAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 7
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We study B° 2![rho]°[rho]° decays in a sample of 465 x 106 [Upsilon](4S) 2!B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy ee− collider located at the Stanford Linear Accelerator Center (SLAC). We measure the branching fraction [Beta] = (0.92 ± 0.32 ± 0.14) x 10−6 and longitudinal polarization fraction f{sub L} = 0.75{sub -0.14}{sup +0.11} ± 0.04, where the first uncertainty is statistical and the second is systematic. The evidence for the B° 2![rho]°[rho]° signal has a significance of 3.1 standard deviations, including systematic uncertainties. We investigate the proper-time dependence of the longitudinal component in the decay and measure the CP-violating coefficients S{sub L}°° = (0.3 ± 0.7 ± 0.2) and C{sub L}°° = (0.2 ± 0.8 ± 0.3). They study the implication of these results for the unitarity triangle angle [alpha].
Author: C. Yeche
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Languages : en
Pages : 4
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We present BABAR experiment studies to measure the CKM angle {alpha} of the Unitarity Triangle. The measurements are based on the B meson decays into the two-body state ({pi}{pi}), the quasi two-body state ({rho}{rho}), and the three-body state ({pi}{sup +}{pi}{sup -}{pi}{sup 0}). The results are obtained from data samples of about 230 million {Upsilon}(4S) {yields} B{bar B} decays collected between 1999 and 2004 with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC.
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Languages : en
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Languages : en
Pages : 5
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We report recent measurements of the CKM angle [alpha] using data collected by the BABAR detector at the PEP-II asymmetric-energy ee− collider at the SLAC National Accelerator Laboratory. In addition to improved constraints on [alpha] from the decays B{sup {+-}} 2![rho]{sup {+-}}[rho]°, we also present preliminary results of neutral and charged B meson decays to K1(1270)[pi] and K1(1400)[pi] and its impact on the estimate for the CKM angle [alpha] based on time-dependent analysis of CP-violating asymmetries in B° 2!a1(1260){sup {+-}} [pi]{sup {-+}}. Moreover we report the first observation of the decay B 2!a1(1260){sup {+-}}a1(1260){sup {-+}}; this mode can be used, in principle, to provide an independent measurement of [alpha].
Author: A. Mihalyi
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Languages : en
Pages : 6
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The method to measure the CKM angle {alpha} and the modes sensitive to it are discussed. It is shown that the B {yields} {rho}{rho} decays provide the most stringent constraint on {alpha}, which is found to be {alpha} = 96{sup o} {+-} 10{sup o}(stat) {+-} 4{sup o}(syst){+-} 13{sup o}(penguin).
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Languages : en
Pages : 9
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B-meson decays involving b → u transitions are sensitive to the Unitarity Triangle angle [alpha] (or [phi]2). The B-factories at SLAC and KEK have made significant progress toward the measurement of [alpha] in recent years. This paper summarizes the results of the B-factories' constraints on [alpha].
