Updated Measurement of the CKM Angle Alpha Using B0-]rho+rho- Decays PDF Download
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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=w150-h200)
Author: B. Aubert
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Languages : en
Pages : 21
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Book Description
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.
![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
Publisher:
ISBN:
Category :
Languages : en
Pages : 21
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Book Description
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.
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Category :
Languages : en
Pages :
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Author: Attila Mihalyi
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Category :
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}.
![Study of the Decay B0 (anti-B0) -]rho+rho- and Constraints on the CKM Angle Alpha PDF](https://books.google.com/books/content/images/frontcover/kiLmjwEACAAJ?fife=w80-h100)
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Languages : en
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Using a data sample of 89 million [Upsilon](4S) [yields] B[bar B] decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC, the authors measure the B[sup 0]([bar B][sup 0]) [yields] [rho][sup +][rho][sup -] branching fraction as (30 [+-] 4(stat) [+-] 5(syst)) x 10[sup -6] and a longitudinal polarization fraction of f[sub L] = 0.99 [+-] 0.03(stat)[sub -0.03][sup +0.04](syst). They measure the time-dependent-asymmetry parameters of the longitudinally polarized component of this decay as C[sub L] = -0.17 [+-] 0.27(stat) [+-] 0.14(syst) and S[sub L] = -0.42(stat) [+-] 0.14(syst). They present constraints on the CKM angle [alpha].
Author: H. Li
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Category :
Languages : en
Pages :
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Using a data sample of 122 million {Upsilon}(4S) {yields} B{bar B} decays collected with BABAR detector at the PEP-II asymmetric B factory at SLAC, we measure the time-dependent-asymmetry parameters of the longitudinally polarized component in the B{sup 0} {yields} {rho}{sup +}{rho}{sup -} decay as C{sub L} = -0.23 {+-} 0.24(stat) {+-} 0.14(syst) and S{sub L} = -0.19 {+-} 0.33(stat) {+-} 0.11(syst). The B{sup 0} {yields} {rho}{sup 0}{rho}{sup 0} decay mode is also searched for in a data sample of about 227 million B{bar B} pairs. No significant signal is observed, and an upper limit of 1.1 x 10{sup -6} (90% C.L.) on the branching fraction is set. The penguin contribution to the CKM angle {alpha} uncertainty is measured to be 11{sup o}. All results are preliminary.
Author: A. Mihalyi
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ISBN:
Category :
Languages : en
Pages : 6
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Book Description
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).
![Measurement of the CKM Angles [alpha] and [gamma] at the BABAR Experiment PDF](https://books.google.com/books/content/images/frontcover/rCbDDAEACAAJ?fife=w80-h100)
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Languages : en
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The primary objective of the BABAR Experiment is to test the Standard Model explanation of CP violation in weak decays by over-constraining the CKM Unitarity Triangle. This includes the measurement of all three angles of the triangle. Although precise measurements of the angle [beta] have been obtained using B decays to charmonium states, the remaining angles, [alpha] and [gamma], pose greater experimental challenges. In this paper, the latest measurements of modes which will constrain [alpha] and [gamma] will be presented, including B[sup 0] --> [rho][sup +][rho][sup -] for [alpha] and a measurement of sin(2[beta] + [gamma]) from the B[sup 0] --> D(*)[sup [+-]][pi][sup [-+]] system.
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Languages : en
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Author:
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Category :
Languages : en
Pages : 7
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The authors search for the decays B° 2![rho]°[rho]°, B° 2![rho]° f0(980), and B° 2!f0(980) f0(980) in a sample of about 384 million [Upsilon](4S) 2!B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy ee− collider at SLAC. They find evidence for B° 2![rho]°[rho]° with 3.5[sigma] significance and measure the branching fraction [Beta] = (1.07 ± 0.33 ± 0.19) x 10−6 and longitudinal polarization fraction f{sub L} = 0.87 ± 0.13 ± 0.04, where the first uncertainty is statistical, and the second is systematic. The uncertainty on the CKM unitarity angle [alpha] due to penguin contributions in B 2![rho][rho] decays is 18{sup o} at the 1[sigma] level. They also set upper limits on the B° 2![rho]° f0(980) and B° 2!f0(980)f0(980) decay rates.
