Download or read book A Study of B0 to Rho rho Decays and Constraints on TheCKM Angle Alpha written by and published by . This book was released on 2007 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present results from an analysis of B° →??− decays using (383.6 ± 4.2) x 106 B{bar B} pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The measurements of the B° →?+?− branching fraction, longitudinal polarization fraction f{sub L}, and the CP-violating parameters S{sub long} and C{sub long} are:?(B° →?+?−) = (25.5 ± 2.1(stat){sub -3.9}{sup +3.6}(syst)) x 10−6, f{sub L} = 0.992 ± 0.024(stat){sub -0.013}{sup +0.026}(syst), S{sub long} = -0.17 ± 0.20(stat){sub -0.06}{sup +0.05}(syst), C{sub long} = 0.01 ± 0.15(stat) ± 0.06(syst). The authors determine the unitarity triangle angle?, using an isospin analysis of B →?? decays. One of the two solutions,? = [73.1, 117.0]{sup o} at 68% CL is compatible with standard model-based fits of existing data. Constraints on the unitarity triangle are also evaluated using an SU(3) symmetry based approach.

Download or read book Study of the Decay B0 anti B0 rho rho and Constraints on the CKM Angle Alpha written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].

Download or read book Constraints on the CKM Angle Alpha in the B to Rho Rho Decays written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Improved Measurement of the CKM Angle Alpha Using B0 to Rho rho Decays written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of the Decay Beta plus minus Rho plus minus Rho zero at the BABAR Experiment and Its Impact on the CKM Angle Alpha written by Katharine Clare Schofield and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Updated Measurement of the CKM Angle Alpha Using B0 rho rho Decays written by B. Aubert and published by . This book was released on 2006 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Study of B0 rho Rho Decays with the Belle Experiment written by Pit Vanhoefer and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the CKM Angle Alpha at the BABAR Detector Using B Meson Decays to Rho Final States written by Attila Mihalyi and published by . This book was released on 2005 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recent Results on the CKM Angle Alpha written by A. Mihalyi and published by . This book was released on 2005 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).

Download or read book Measurement of the Angle Alpha at BABAR written by and published by . This book was released on 2009 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present 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, operating at the [Upsilon](4S) resonance. They present constraints on [alpha] from B 2![pi][pi], B 2![rho][rho] and B 2![rho][pi] decays.

Download or read book Measurement of the CKM Angles alpha and gamma at the BABAR Experiment written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Comment on Extracting Alpha from B to Rho Rho written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experimental results on B [yields] [rho][rho] decays indicate that the CP asymmetry S[sub [rho][sup +][rho][sup -]] will give an interesting determination of [alpha] = arg[-(V[sub td]V*[sub tb])/(V[sub ud]V*[sub ub])]. In the limit when the [rho] width is neglected, the B [yields] [pi][pi] isospin analysis can also be applied to B [yields] [rho][rho], once an angular analysis is used to separate transversity modes. The present bound on the shift of S[sub [rho][sup +][rho][sup -]] from the true sin 2[alpha] is already stronger than it is for S[sub [pi][sup +][pi][sup -]]. The authors point out a subtle violation of the isospin relations when the two [rho] mesons are observed with different invariant masses, and how to constrain this effect experimentally.

Download or read book Expected Accuracy in a Measurement of the CKM Angle Alpha Using a Dalitz Plot Analysis of B0 Rho Pi Decays in the BTeV Project written by and published by . This book was released on 2005 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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}.

Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Comment on Extracting Alpha from B to Rho Rho written by A. Falk and published by . This book was released on 2003 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experimental results on B {yields} {rho}{rho} decays indicate that the CP asymmetry S{sub {rho}{sup +}{rho}{sup -}} will give an interesting determination of {alpha} = arg[-(V{sub td}V*{sub tb})/(V{sub ud}V*{sub ub})]. In the limit when the {rho} width is neglected, the B {yields} {pi}{pi} isospin analysis can also be applied to B {yields} {rho}{rho}, once an angular analysis is used to separate transversity modes. The present bound on the shift of S{sub {rho}{sup +}{rho}{sup -}} from the true sin 2{alpha} is already stronger than it is for S{sub {pi}{sup +}{pi}{sup -}}. The authors point out a subtle violation of the isospin relations when the two {rho} mesons are observed with different invariant masses, and how to constrain this effect experimentally.

Download or read book Measurement of the CKM Angle Alpha with the B factories written by and published by . This book was released on 2005 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].

Download or read book Measurement of CP Asymmtetries at BABAR written by G. Mancinelli and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present preliminary measurements of CP-violating asymmetries in B decays. These include new results on the CKM angle {alpha} based on studies of the decay B {yields} {rho}{sup +}{rho}{sup -} and several charmonium and hadronic penguin modes, sensitive to the CKM angle {beta}, including results on B {yields} {phi}K{sub S}{sup 0}, B {yields} K{sup +}K{sup -}K{sup 0}, B {yields} {eta}{prime} K{sub S}{sup 0}, B {yields} f{sub 0}K{sub S}{sup 0}, and B {yields} {pi}{sup 0} K{sub S}{sup 0}. We also report on several of results related to the extraction of {gamma} and (2{beta} + {gamma}) and present limits on CPT violation in B decays.