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 Two and Three Body Charmless B Decays at BaBar written by and published by . This book was released on 2012 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report recent measurements of rare charmless B decays performed by BaBar. The results are based on the final BaBar dataset of 424 fb−1 collected at the PEP-II B-factory based at the SLAC National Accelerator Laboratory. The study of rare B decays is a key ingredient to meet two of the main goals of the B-factories: assessing the validity of the Cabibbo-Kobayashi-Maskawa (CKM) picture of CP-violation by precisely measuring the elements of the Unitarity Triangle (UT), and searching for hints of New Physics (NP), or otherwise constraining NP scenarios, in processes which are suppressed in the Standard Model (SM). In loop processes, in particular, NP at some higher energy scale may manifest itself in the low energy effective theory as new couplings, such as those introduced by new very massive virtual particles in the loop. In NP searches hadronic uncertainties can play a major role, expecially for branching fraction measurements. Many theoretical uncertainties cancel in ratios of amplitudes, and most NP probes are therefore of this kind. In the following sections we report recent measurements, performed by the BaBar Collaboration, that are relevant to NP searches in charmless hadronic B decays.
Download or read book Storia d una terebrazione per un dolore fisso al vertice pel corso di tre anni written by Timoteo Riboli and published by . This book was released on 1846 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Charmless Hadronic B Decays at Belle and BaBar written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: I report on recent measurements from the Belle and BABAR collaborations on the decay of the B meson to hadronic final states without a charm quark. The study of the branching fractions and angular distributions of B meson decays to hadronic final states without a charm quark probes the dynamics of both the weak and strong interactions, and plays an important role in understanding CP Violation (CPV) in the quark sector. CP Violation at the B factories is described graphically by a triangle with sides formed from the CKM matrix elements V{sub qd}V*{sub qb} (q = u, c, t) and internal angles [alpha], [beta] [gamma] (or [phi]2, [phi]1, [phi]3). Discrepancies in the measured values of the sides and angles could be an indication of New Physics beyond the Standard Model (SM) due to enhanced branching fractions or modified CP asymmetries. The experimental measurements of branching fractions, CP asymmetries, polarization and phases (both weak and strong) can be compared to theoretical models based on, for example, QCD factorization, SU(3) symmetry and Lattice QCD.
Download or read book Measurement of Charmless Hadronic B Decays Branching Fractions at BaBar written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present preliminary measurements of the branching fractions for charmless hadronic decays of B mesons into two-body final states with kaons, pions and a [phi] resonance. The measurements are based on a data sample of approximately 23 million B{bar B} pairs collected by the BaBar detector at the PEP-II asymmetric B Factory at SLAC.
Download or read book Measurements of Partial Branching Fractions for Charmless Semileptonic B Decays with the BaBar Experiment and Determination of Vub written by Nicola Gagliardi and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Charmless B to Vector Vector Decays at BaBar written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present results of B → vector-vector (VV) and B → vector-axial vector (VA) decays B° →?X(X =?,? or?°), B+ →?K{sup (*)+}, B° → K*K*, B° →?+b1− and B+ → K*°?1+. The largest dataset used for these results is based on 465 x 106?(4S) → B{bar B} decays, collected with the BABAR detector at the PEP-II B meson factory located at the Stanford Linear Accelerator Center (SLAC). Using larger datasets, the BABAR experiment has provided more precise B → VV measurements, further supporting the smaller than expected longitudinal polarization fraction of B →?K*. Additional B meson to vector-vector and vector-axial vector decays have also been studied with a view to shedding light on the polarization anomaly. Taking into account the available errors, we find no disagreement between theory and experiment for these additional decays.
Download or read book BaBar written by D. Hutchcroft and published by . This book was released on 2006 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three two body and two resonance decays of the B mesons have been measured using data from the BABAR detector: B{sup 0} {yields} {pi}{sup {+-}}, K{sup {-+}}, K{sup +}K{sup -}, K{sub S}{sup 0}{pi}{sup +}{pi}{sup -} and B{sup 0} {yields} a{sub 1}{sup +}(1260){pi}{sup -}. The branching ratio and that of some intermediate resonances are presented along with the Cp asymmetry of the decay B{sup 0} {yields} K*{sup +}{pi}{sup -}.
Download or read book Charmless 2 and 3 Body B Decays and the Angle Alpha phi 2 written by M. Cristinziani 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 branching fractions and CP-asymmetry parameters in two- and three-body charmless hadronic B decays. The available data sample consists of 227 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. We establish the observation of the decays B{sup 0} {yields} {pi}{sup 0}{pi}{sup 0} and B{sup 0} {yields} K{sup 0}{bar K}{sup 0} and constrain the CKM angle {alpha} with a full SU(2) isospin analysis in the B {yields} {pi}{pi} system and with a B{sup 0} {yields} {pi}{sup +}{pi}{sup -}{pi}{sup 0} time-dependent Dalitz plot analysis.
Download or read book Charmless B Decays from BABAR B0 K 0 Gamma and B0 pi pi K pi K K written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The BaBar experiment has completed its first year of data-taking during which 21 fb[sup -1] of data were accumulated. We present preliminary results on two types of charmless B decays based on this data sample. The first, B[sup 0][yields] K*[sup 0][gamma], is a so-called electromagnetic penguin. And the second, B[sup 0][yields] h[sup+] h'[sup -] can be either a pion or kaon, can come from either penguin diagrams or Cabibbo suppressed tree diagrams.
Download or read book Study of Charmless Semileptonic B Decays and a Measurement of the CKM Matrix Element Vub at BaBar written by and published by . This book was released on 2004 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Charmless Hadronic B Decays at BaBar written by and published by . This book was released on 2007 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report recent measurements for the branching fractions of charmless hadronic B decays obtained from data collected by the BABAR detector at the PEP-II asymmetric-energy collider at the Stanford Linear Accelerator Center.
Download or read book Studies of CP Violation in Charmless Three Body b Hadron Decays written by Daniel O'Hanlon and published by Springer. This book was released on 2018-11-02 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights two essential analyses of data collected during the LHCb experiment, based on the Large Hadron Collider at CERN. The first comprises the first observation and studies of matter-antimatter asymmetries in two three-body b-baryon decays, paving the way for more precise measurements of the relatively unknown decay properties of b-baryon decays. The second is an analysis of a charged B meson decay to three charged pions, where previously large matter-antimatter asymmetries were observed in a model-independent analysis. Here a model of the decay amplitude is constructed using the unitarity-conserving ‘K-matrix’ model for the scalar contributions, so as to gain an understanding of how the previously observed matter-antimatter asymmetries arise; further, the model’s construction yields the most precise and comprehensive study of this decay mode to date.
Download or read book Henri IV de Luigi Pirandelo written by and published by . This book was released on 1950 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Results from 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 authors present an overview of some of the most recent results from the BABAR experiment. They discuss the latest measurement of the time-dependent CP-violating asymmetries in neutral B decays to several CP eigenstates, that in the Standard Model (SM) is proportional to sin 2[beta]. They present measurements of branching fractions and CP-violating asymmetries in neutral B decays to two-body final states of charged pions and kaons, that are related to the angle [alpha] of the Unitarity Triangle. They also report the B[sup 0] lifetime measurement obtained from studying the B[sup 0] [yields] D*[sup -] [pi][sup +] and B[sup 0] [yields] D*[sup -] [rho][sup +] decay channels and the B[sup 0] [yields] D*[sup -] a[sub 1][sup +] branching fraction, obtained using a partial reconstruction technique. These measurements serve as a test and validation of the procedures required to measure the combination of CKM Unitarity Triangle angles sin(2[beta] + [gamma]).
Download or read book Measurements of Beta in B Decays to Charm and Charmonium at BaBar written by and published by . This book was released on 2007 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this article we will review recent BABAR measurements of Unitarity Triangle angle [beta] in B meson decays to charm and charmonium.
