Measurement of the Hadronic Mass Spectrum in B[right Arrow]X[subscript U]l[nu] Decays and Determination of the B-quark Mass at the BABAR Experiment PDF Download
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![Measurement of the Hadronic Mass Spectrum in B[right Arrow]X[subscript U]l[nu] Decays and Determination of the B-quark Mass at the BABAR Experiment PDF](https://books.google.com/books/content/images/frontcover/CmZOAQAAMAAJ?fife=w150-h200)
Author: Kerstin Tackmann
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Languages : en
Pages : 300
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![Measurement of the Hadronic Mass Spectrum in B[right Arrow]X[subscript U]l[nu] Decays and Determination of the B-quark Mass at the BABAR Experiment PDF](https://books.google.com/books/content/images/frontcover/CmZOAQAAMAAJ?fife=w80-h100)
Author: Kerstin Tackmann
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ISBN:
Category :
Languages : en
Pages : 300
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Languages : en
Pages : 145
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I present preliminary results of the measurement of the hadronic mass spectrum and its first three spectral moments in inclusive charmless semileptonic B-meson decays. The truncated hadronic mass moments are used for the first determination of the b-quark mass and the nonperturbative parameters [mu][pi]2 and [rho]D3 in this B-meson decay channel. The study is based on 383 x 106 B$\bar{B}$ decays collected with the BABAR experiment at the PEP-II e+e- storage rings, located at the Stanford Linear Accelerator Center. The first, second central, and third central hadronic mass moment with a cut on the hadronic mass mX2 6.4GeV2 and the lepton momentum p* 1 GeV are measured to be: M1 = (1.96 ± 0.34stat ± 0.53syst) GeV2; U2 = (1.92 ± 0.59stat ± 0.87syst) GeV4; and U3 = (1.79 ± 0.62stat ± 0.78syst) GeV6; with correlation coefficients [rho]12 = 0.99, [rho]23 = 0.94, and [rho]13 = 0.88, respectively. Using Heavy Quark Effective Theory-based predictions in the kinetic scheme we extract: mb = (4.60 ± 0.13stat ± 0.19syst ± 0.10theo GeV); [mu][pi]2 = (0.40 ± 0.14stat ± 0.20syst ± 0.04theo) GeV2; [rho]D3 = (0.10 ± 0.02stat ± 0.02syst ± 0.07theo) GeV3; at [mu] = 1 GeV, with correlation coefficients [rho]mb[mu][pi]2 = -0.99, [rho] [mu][pi]2[rho]D3 = 0.57, and [rho]mb[rho]D3 = -0.59. The results are in good agreement with earlier determinations in inclusive charmed semileptonic and radiative penguin B-meson decays and have a similar accuracy. Through the comparison of this result to those obtained in other channels, this provides a test of the Heavy Quark Effective Theory predictions that are used for the determination of.
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Languages : en
Pages :
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Knowing the mass of the b-quark is essential to the study of the structure and decays of B mesons as well as to future tests of the Higgs mechanism of mass generation. We present recent preliminary measurements of the b-quark mass and related nonperturbative parameters from moments of kinematic distributions in charmed and charmless semileptonic and radiative penguin B decays. Their determination from charmless semileptonic B decays is the first measurement in this mode. The data were collected by the BABAR detector at the PEP-II asymmetric-energy ee−-collider at the Stanford Linear Accelerator Center at a center-of-momentum energy of 10:58 GeV.
![A MEASUREMENT of the b-quark Mass from Hadronic Z Decays [Extras] PDF](https://books.google.com/books/content/images/frontcover/dQN7zwEACAAJ?fife=w80-h100)
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Languages : en
Pages : 0
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Author: Sheldon Stone
Publisher: World Scientific
ISBN: 9789810218973
Category : Science
Languages : en
Pages : 676
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This 2nd edition is an extensive update of "B Decays?. The revisions are necessary because of the extensive amount of new data and new theoretical ideas. This book reviews what is known about b-quark decays and also looks at what can be learned in the future.The importance of this research area is increasing, as evidenced by the approval of the luminosity upgrade for CESR and the asymmetric B factories at SLAC and KEK, and the possibility of experiments at hadron colliders.The key experimental observations made thus far, measurement of the lifetimes of the different B species, B0-B0 mixing, the discovery of ?Penguin? mediated decays, and the extraction of the CKM matrix elements Vub and Vcb from semileptonic decays, as well as more mundane results, are described in great detail by the experimentalists who have been closely involved with making the measurements. Theoretical progress in understanding b-quark decays using HQET and lattice gauge techniques are described by theorists who have developed and used these techniques.Synthesizing the experimental and theoretical information, several articles discuss the implications for the ?Standard Model? and how further tests can be done using measurements of CP violation in the B system.
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Languages : en
Pages : 7
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Using a sample of 383 million B{bar B} events collected by the BABAR experiment, they measure sums of seven exclusive final states B → X{sub d(s)}[gamma], where X{sub d}(X{sub s}) is a non-strange (strange) charmless hadronic system in the mass range 0.6-1.8 GeV/c2. After correcting for unmeasured decay modes in this mass range, they obtain a branching fraction for b → d[gamma] of (7.2 ± 2.7(stat.) ± 2.3(syst.)) x 10−6. Taking the ratio of X{sub d} to X{sub s} they find [Lambda](b → d[gamma])/[Lambda](b → s[gamma]) = 0.033 ± 0.013(stat.) ± 0.009(syst.), from which they determine.
![Semi-inclusive Measurement of [bottom Quark Decaying to Downquark-gamma] at BABAR with Runs 1-5 Data PDF](https://books.google.com/books/content/images/frontcover/AhqJaYE7x9YC?fife=w80-h100)
Author: Timothy Beck
Publisher:
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Category :
Languages : en
Pages : 318
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Author:
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Languages : en
Pages : 24
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We report a preliminary measurement of the first and second moments of the hadronic mass distributions in B → X{sub c}l[nu] decays. The measurements are based on [Upsilon](4S) → B{bar B} events where the hadronic decay of one of the B mesons is fully reconstructed and a charged lepton from the decay of the other B meson is identified. The moments are presented for threshold lepton momenta ranging from 0.9 to 1.6 GeV. From the M{sub X}2 moments we determine the non-perturbative Heavy Quark Expansion (HQE) parameters, {bar {Lambda}} and [lambda]1. We combine the measured moments M{sub X}2 with earlier BABAR measurements of the semileptonic branching ratios and B lifetimes and perform a simultaneous fit to the HQE for the moments obtained for different threshold lepton momenta and the semileptonic decay width. This fit results in an improved value for the CKM matrix element.
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Languages : en
Pages : 4
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Author: Jan Erik Sundermann
Publisher:
ISBN:
Category :
Languages : en
Pages : 161
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