Expected Accuracy in a Measurement of the CKM Angle Alpha Using a Dalitz Plot Analysis of B0 ---] Rho Pi Decays in the BTeV Project

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 Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26

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Book Description
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}.

Expected Accuracy in a Measurement of the CKM Angle Alpha Using a Dalitz Plot Analysis of B0 ---] Rho Pi Decays in the BTeV Project

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 Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26

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Book Description
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}.

Improved Measurement of the CKM Angle Alpha Using B0 to Rho+rho- Decays

Improved Measurement of the CKM Angle Alpha Using B0 to Rho+rho- Decays PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
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}.

Measurement of CP-Violating Asymmetries in B0 to (rho Pi)0 Using a Time-Dependent Dalitz Plot Analysis

Measurement of CP-Violating Asymmetries in B0 to (rho Pi)0 Using a Time-Dependent Dalitz Plot Analysis PDF Author:
Publisher:
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Category :
Languages : en
Pages :

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Measurement of the CKM Angles [alpha] and [gamma] at the BABAR Experiment

Measurement of the CKM Angles [alpha] and [gamma] at the BABAR Experiment PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
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.

Constraints on the CKM Angle Alpha in the B to Rho Rho Decays

Constraints on the CKM Angle Alpha in the B to Rho Rho Decays PDF Author:
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Category :
Languages : en
Pages :

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Book Description


Heavy Flavours

Heavy Flavours PDF Author: A J Buras
Publisher: World Scientific
ISBN: 9814602825
Category :
Languages : en
Pages : 803

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Book Description
This volume is a collection of review articles on the most outstanding topics in heavy flavour physics. All the authors have made significant contributions to this field. The book reviews in detail the theoretical structure of heavy flavour physics within the Standard Model and its confrontation with existing experimental data.The physics of the top quark and of the Higgs play an important role in this volume. Beginning with radiative electroweak corrections and their impressive tests at LEP and hadron colliders, the book summarizes the present status of quark mixing, CP violation and rare decays. The dynamics of exclusive D- and B-meson decays, the τ-lepton physics and the newly discovered heavy quark symmetries are discussed in detail. The impact of strong interactions on weak decays is clearly visible in many articles. The physics of heavy flavours at LEP, HERA and hadron colliders constitutes an important part of the book. Another significant topic is the possible role of heavy flavours in the spontaneous symmetry breaking of gauge symmetries. Finally the most recent advances in lattice calculations of the properties of heavy flavours and the lattice studies of the dynamics of heavy flavours are presented.

Measurement of the CKM Angle Alpha at BaBar

Measurement of the CKM Angle Alpha at BaBar PDF Author: C. Yeche
Publisher:
ISBN:
Category :
Languages : en
Pages : 4

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Book Description
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.

Measurement of the Angle Alpha at BABAR.

Measurement of the Angle Alpha at BABAR. PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 4

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Book Description
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.

Measurements of Sin2 Alpha Phi_2 from B to Pi Pi, Rho Pi and Rho Rho Modes

Measurements of Sin2 Alpha Phi_2 from B to Pi Pi, Rho Pi and Rho Rho Modes PDF Author: A. Bevan
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
B meson decays involving b {yields} u transitions are sensitive to the unitarity triangle angle {alpha} (or {phi}{sub 2}). The BABAR and Belle experiments have studied B-meson decays to {pi}{pi}, {rho}{pi} and {rho}{rho} final states. It is possible to combine these measurements to constrain {alpha} with a precision of {Omicron}(10{sup o}) and a central value of approximately 100 degrees. These results are consistent with Standard Model expectations.

Measurements of the CKM Angle Phi3/gamma

Measurements of the CKM Angle Phi3/gamma PDF Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 11

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Book Description
We present a review on the measurements of the CKM angle [gamma] ([phi]3)1 as performed by the BABAR and Belle experiments at the asymmetric-energy ee− B factories colliders PEP-II and KEKB. These measurements are using either charged or neutral B decays. For charged B decays the modes {tilde D}°K−, {tilde D}*°K−, and {tilde D}°K*− are employed, where {tilde D}° indicates either a D° or a {bar D}° meson. Direct CP violation is exploited. It is caused by interferences between V{sub ub} and V{sub cb} accessible transitions that generate asymmetries in the final states. For these decays various methods exist to enhance the sensitivity to the V{sub ub} transition, carrying the weak phase [gamma]. For neutral B decays, the modes D{sup (*){+-}}[pi]{sup {-+}} and D{sup {+-}}[rho]{sup {-+}} are used. In addition to the V{sub ub} and V{sub cb} interferences, these modes are sensitive to the B°-{bar B}° mixing, so that time dependent analyses are performed to extract sin(2[beta] + [gamma]). An alternative method would use the lower branching ratios decay modes {tilde D}{sup (*)0}{bar K}{sup (*)0} where much larger asymmetries are expected. The various available methods are mostly ''theoretically clean'' and always free of penguins diagrams. In some cases a high sensitivity to [gamma] is expected and large asymmetries may be seen. But these measurements are always experimentally difficult as one has to face with either low branching ratios, or small asymmetries, or additional technical/theoretical difficulties due to Dalitz/SU(3) and re-scattering models needed to treat/estimate nuisance parameters such as unknown strong phases and the relative magnitude of the amplitude of the interfering ''V{sub ub}'' transitions. Thus at the present time only a relatively limited precision on [gamma] can be extracted from these measurements. The current world average is [gamma] = (7826{sup +19}){sup o} [1]. For other methods and long term perspectives, as discussed in details, the reader is invited to consult the proceedings of the recent CKM workshop that was held in Nagoya (Japan) in December 2006 [2].