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 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 Constraints on the CKM Angle Alpha in the B to Rho Rho Decays written by H. Li 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 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.
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 Evidence for B to Rho0rho0 Decay and Implications for the CKM Angle Alpha written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
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 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: We present results from an analysis of B° ({bar B}°) →??− using 232 million?(4S) → B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. We measure the longitudinal polarization fraction f{sub L} = 0.978 ± 0.014(stat){sub -0.029}{sup +0.021}(syst) and the CP-violating parameters S{sub L} = -0.33 ± 0.24(stat){sub -0.14}{sup +0.08}(syst) and C{sub L} = -0.03 ± 0.18(stat) ± 0.09(syst). Using an isospin analysis of B →?? decays we determine the unitarity triangle?. The solution compatible with the Standard Model is? = (100 ± 13){sup o}.
Download or read book Reglement f r den zweiten schleswigschen Deichband vom 20 April 1805 written by and published by . This book was released on 1859 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Charmless B Decays Related to Alpha at BaBar written by and published by . This book was released on 2009 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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].
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 Limit on the B0 to Rho0rho0 Branching Fraction and Implications for the CKM Angle Alpha written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors search for the decay B° 2![rho]°[rho]° in a data sample of about 227 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 no significant signal and set an upper limit of 1.1 x 10−6 at 90% CL on the branching fraction. As a result, the uncertainty due to penguin contributions on the CKM unitarity angle [alpha] measured in B 2![rho][rho] decays is 11{sup o} at 68% CL.
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 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 The Use of Early Data on B r underscore arrow rho pi Decays written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper reviews the Dalitz plot analysis for decays B[sup 0](anti-B[sup 0])[r[underscore]arrow][rho][pi][r[underscore]arrow][pi][sup+][pi][sup[minus]]pi[sup 0]. The authors discuss what can be learned about the ten parameters in this analysis from untagged and from tagged time-integrated data. The authors find that, with the important exception of the interesting CP violating quantity[alpha], the parameters can be determined from this data sample--and, hence, they can be measured at CLEO as well as at the asymmetric B factories. This suggests that the extraction of[alpha] from the time-dependent data sample can be accomplished with a smaller data sample (and, therefore, sooner) than would be required if all ten parameters were to be obtained from that time-dependent data sample alone. The authors also explore bounds on the shift of the true angle[alpha] from the angle measured from charged[rho] final states alone. These may be obtained prior to measurements of the parameters describing the neutral[rho] channel, which are expected to be small.
Download or read book Study of the Decay B0bar D Omega Pi written by B. Aubert and published by . This book was released on 2006 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a study of the decay {bar B}{sup 0} {yields} D*{sup +}{omega}{pi}{sup -} with the BABAR detector at the PEP-II B-factory at the Stanford Linear Accelerator Center. Based on a sample of 232 million B{bar B} decays, we measure the branching fraction {Beta}({bar B}{sup 0} {yields} D*{sup +}{omega}{pi}{sup -}) = (2.88 {+-} 0.21(stat.) {+-} 0.31(syst.)) x 10{sup -3}. We study the invariant mass spectrum of the {omega}{pi}{sup -} system in this decay. This spectrum is in good agreement with expectations based on factorization and the measured spectrum in {tau}{sup -} {yields} {omega}{pi}{sup -} {nu}{sub {tau}}. We also measure the polarization of the D*{sup +} as a function of the {omega}{pi}{sup -} mass. In the mass region 1.1 to 1.9 GeV we measure the fraction of longitudinal polarization of the D*{sup +} to be {Lambda}{sub L}/{Lambda} = 0.654 {+-} 0.042(stat.) {+-} 0.016(syst.). This is in agreement with the expectations from heavy-quark effective theory and factorization assuming that the decay proceeds as {bar B}{sup 0} {yields} D*{sup +}{rho}(1450), {rho}(1450) {yields} {omega}{pi}{sup -}.
Download or read book Studies of the Decays B 0 right Arrow D D B0 right Arrow D D B 0 right Arrow D D B 0 right Arrow D D B0 right Arrow D D B0 right Arrow D D B 0 right Arrow D D and B0 right Arrow D D written by Edward Michael Potter and published by . This book was released on 2000 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of CP Violation and Measurement of the CKM Angle in B0 DK 0 Decays written by Hannah Louise Pullen and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
