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Download or read book Measurement of the Moments of the Hadronic Invariant Mass Distribution in Semileptonic Beta Decays written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 9 pages
Book Rating : 4.:/5 (873 download)
Download or read book Measurement of the Moments of the Hadronic Invariant Mass Distribution in Semileptonic B Decays written by and published by . This book was released on 2005 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (871 download)
Download or read book Measurements of Moments of the Hadronic Mass Distribution in Semileptonic B Decays written by and published by . This book was released on 2004 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a measurement of the first four moments of the hadronic mass distribution in {bar B} → X{sub c}l− {bar {nu}} decays. The measurements are based on 89 million [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 minimum lepton momenta ranging from 0.9 to 1.6 GeV in the B rest frame. It is expected that such measurements will lead to improved determinations of.
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ISBN 13 :
Total Pages : 159 pages
Book Rating : 4.:/5 (953 download)
Download or read book Measurement and Interpretation of Moments of the Combined Hadronic Mass and Energy Spectrum in Inclusive Semileptonic B-Meson Decays written by and published by . This book was released on 2011 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents first measurements of moments of the hadronic nX2 distribution measured in inclusive semileptonic decays of B mesons to final states containing a charm quark, B 2!Xcl[nu]. The variable nX2 is a combination of the invariant mass of the charmed meson mX, its energy in the B-meson rest-frame EX;BRF, and a constant ~[Lambda] = 0.65 GeV, nX2 = mX2c4-2~[Lambda]EX, BRF + ~[Lambda]2. The moments nXk with k = 2,4,6 are measured as proposed by theory to constrain assumptions made in the theoretical description of inclusive observables in semileptonic B-meson decays. This description uses Heavy Quark Expansion (HQE), an effective QCD combined with an Operator Product Expansion. The measurement is based on a sample of 231.6 million e+e- 2 2!B$\bar{B}$ events recorded with the BABAR experiment at the PEP-II e+e--storage rings at SLAC. We reconstruct the semileptonic decay by identifying a charged lepton in events tagged by a fully reconstructed hadronic decay of the second B meson. Correction procedures are derived from Monte Carlo simulations to ensure an unbiased measurement of the moments of the nX2 distribution. All moments are measured requiring minimum lepton momenta between 0.8 GeV/c and 1.9 GeV/c in the rest frame of the B meson. Performing a simultaneous fit to the measured moments nXk up to order k = 6 combined with other measurements of moments of the lepton-energy spectrum in decays B 2!Xcl[nu] and moments of the photon-energy spectrum in decays B 2!Xs[gamma], we determine the quark-mixing parameter.
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Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (871 download)
Download or read book Measurement of the First and Second Moments of the Hadronic Mass Distribution in Semileptonic B Decays written by and published by . This book was released on 2003 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Jose Feliciano Benitez
Publisher : Stanford University
ISBN 13 :
Total Pages : 320 pages
Book Rating : 4.F/5 ( download)
Download or read book Measurement of the D_s Leptonic Decay Constant F_{D_s} and Observation of New Resonances Decaying to D^(*)pi written by Jose Feliciano Benitez and published by Stanford University. This book was released on 2011 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: The absolute branching fractions for the decays $D^-_s\rightarrow\ell^-\bar{\nu}_{\ell}$ ($\ell=e$, $\mu$, or $\tau$) are measured using a data sample corresponding to an integrated luminosity of 521 fb$^{-1}$ collected at center of mass energies near 10.58 GeV with the BABAR detector at the PEP-II $e^+e^-$ collider at SLAC. The number of $D_s^-$ mesons is determined by reconstructing the recoiling system $DKX\gamma$ in events of the type $e^+e^-{\rightarrow}DKXD^{*-}_s$, where $D^{*-}_s\rightarrow D^-_s\gamma$ and $X$ represents additional pions from fragmentation. The $D^-_s\rightarrow\ell^-\nu_{\ell}$ events are detected by full or partial reconstruction of the recoiling system $DKX\gamma\ell$. The following results are obtained: $B(D^-_s \to \mu^- \nu) = (6.02 \pm 0.38 \pm 0.34) \times 10^{-3}$, $B(D^-_s \to \tau^- \nu) = (5.00 \pm 0.35 \pm 0.49) \times 10^{-2}$, and $B(D^-_s \to e^- \nu)
Download or read book Preliminary Measurement of the First Hadronic Spectral Moment from Semileptonic B Decays written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A preliminary determination of the first moment of the hadronic mass distributionM[sub X][sup 2] -[bar m][sub D][sup 2] in semileptonic B decays has been obtained as a function of the minimum lepton momentum, ranging from 0.9 to 1.6 GeV/c. The measurement is based on a new technique involving B[bar B] events in which one fully reconstructed B meson decays hadronically and the recoiling B decays semileptonically. The mass of the hadrons in the semileptonic decay is determined from a kinematic fit to the whole event. For different minimum lepton momenta, the mass distribution is decomposed into contributions from various charm resonant states and a non-resonant contribution, allowing for the determination of the first moment. From these moments the Heavy Quark Effective Theory (HQET) parameters[lambda][sub 1] and[bar[Lambda]] can be derived. For lepton momenta in the B rest frame above 1.5 GeV/c, we find a first moment that is compatible with existing measurements. However, if we extend the measurement to lower values of lepton momenta, the data can only be described by Operator Product Expansion calculations if we use significantly different values for[bar[Lambda]] and[lambda][sub 1] than obtained from earlier measurements based on lepton momentum spectra and the photon spectrum in b[yields] s[gamma] transitions.
Author :
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ISBN 13 :
Total Pages : 268 pages
Book Rating : 4.:/5 (94 download)
Download or read book Measurement of Hadronic Mass Moments from Semileptonic B Meson Decays written by and published by . This book was released on 2004 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download 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 Online Free](https://books.google.com/books/content/images/frontcover/CmZOAQAAMAAJ?fife=w200-h370)
Author : Kerstin Tackmann
Publisher :
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.:/5 (34 download)
Download or read book 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 written by Kerstin Tackmann and published by . This book was released on 2008 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (684 download)
Download or read book A Preliminary Measurement of Hadronic Mass Moments in Semileptonic B Meson Decays written by and published by . This book was released on 2003 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A preliminary measurement of the first moments of the hadron mass M(subscript x) in B --> X lv decays by the BABAR Collaborations is reported. This measurement is performed as a function of the minimum lepton momentum.
Author : Verena Klose
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (244 download)
Download or read book Measurement and Interpretation of Moments of the Combined Hadronic Mass and Energy Spectrum in Inclusive Semileptonic B-meson Decays written by Verena Klose and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Inclusive Semileptonic B Decays at BABAR and Extraction of HQE Parameters written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the first four moments of the hadronic mass distribution in B [yields] C[sub c][ell][bar [nu]] decays is presented for minimum lepton momenta varying between 0.9 and 1.6 GeV, using data recorded with the BABAR detector. Furthermore, a measurement of the inclusive electron energy spectrum for semileptonic B decays together with a measurement of its first, second and third moments for minimum electron energies between 0.6 and 1.5 GeV is reported. We determine the inclusive B [yields] X[sub c][ell][bar [nu]] branching fraction, [Beta][sub c[ell][nu]], the CKM matrix element V[sub cb], and other heavy-quark parameters from a simultaneous fit to the measured moments.
Author : Ye Liu
Publisher :
ISBN 13 :
Total Pages : 272 pages
Book Rating : 4.E/5 ( download)
Download or read book Measurements of the Branching Fractions and Form Factor of Semileptonic Decays of B Mesons to D Mesons written by Ye Liu and published by . This book was released on 1999 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Determination of the Branching Fraction for B Rightarrow X[sub C] Ell Nu Decays and of [verticalV[sub Cb][vertical from Hadronic-Mass and Lepton-Energy Moments PDF Online Free](https://books.google.com/books/content/images/frontcover/cX4xkAEACAAJ?fife=w200-h370)
Download or read book Determination of the Branching Fraction for B Rightarrow X[sub C] Ell Nu Decays and of [verticalV[sub Cb][vertical from Hadronic-Mass and Lepton-Energy Moments written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We determine the inclusive B [yields] X[sub c][ell][nu] branching fraction, [Beta][sub c[ell][nu]], the CKM matrix element V[sub cb], and other heavy-quark parameters from a simultaneous fit to moments of the hadronic-mass and lepton-energy distributions in semileptonic B-meson decays, measured as a function of the lower limit on the lepton energy, using data recorded with the BABAR detector. Using Heavy Quark Expansions (HQEs) to order 1/m[sub b][sup 3], we extract [Beta][sub ce[nu]] = (10.61 [+-] 0.16[sub exp] [+-] 0.06[sub HQE])% and V[sub cb] = (41.4 [+-] 0.4[sub exp] [+-] 0.4[sub HQE] [+-] 0.6[sub th]) x 10[sup -3]. The stated errors refer to the experimental, HQE, and additional theoretical uncertainties.
Author : Masahiro Kuze
Publisher : World Scientific
ISBN 13 : 9812568719
Total Pages : 996 pages
Book Rating : 4.8/5 (125 download)
Download or read book Deep Inelastic Scattering written by Masahiro Kuze and published by World Scientific. This book was released on 2007 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings present the most up-to-date status of deep inelastic scattering (DIS) physics. Topics such as structure function measurements and phenomenology, quantum chromodynamics (QCD) studies in DIS and photoproduction, spin physics and diffractive interactions are reviewed in detail, with emphasis on those studies that push the test of QCD and the Standard Model to the limits of their present range of validity, towards both the very high and the very low four-momentum transfers in lepton-proton scattering.
![Download Measurement of the Partial Branching Fraction for Inclusive Semileptonic B Meson Decays to Light Hadrons B-]Xu L Nu and an Improved Determination of the Quark-Mixing Matrix Element |V_ub| PDF Online Free](https://books.google.com/books/content/images/frontcover/jR1jnQAACAAJ?fife=w200-h370)
Download or read book Measurement of the Partial Branching Fraction for Inclusive Semileptonic B Meson Decays to Light Hadrons B-]Xu L Nu and an Improved Determination of the Quark-Mixing Matrix Element |V_ub| written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents an analysis of inclusive semileptonic $B \to X_u e \nu$ decays using approximately 454 million $\Upsilon(4S) \to B \bar{B}$ decays collected during the years 1999 to 2008 with the BABAR detector. The electron energy, $E_e$, and the invariant mass squared of the electron-neutrino pair, $ q^2$, are reconstructed, where the neutrino kinematics is deduced from the decay products of both B mesons. The final hadronic state, $ X_u$, consists of a sum of many hadronic channels, each of which contains at least one $u$ quark. The variables $q^2$ and $E_e$ are then combined to compute the maximum kinematically allowed invariant mass squared of the hadronic system, $s_h^{max}$. Using these kinematic quantities, the partial branching fraction, $\Delta BR(B \to X_u e \nu)$, unfolded for detector effects, is measured to be $\Delta BR(E_e>2.0 GeV, s_h^{max}3.52 GeV^2) = (3.33 \pm 0.18 \pm 0.21) \times 10^{-4} in the $\Upsilon(4S)$ and \Delta \tilde{\BR}(\tilde E_e1.9 GeV, \tilde {s}^{max}_{h}
Author : Jan Erik Sundermann
Publisher :
ISBN 13 :
Total Pages : 161 pages
Book Rating : 4.:/5 (128 download)
Download or read book Improved Measurements of Hadronic Mass Moments in Decays B -> X_clν and Determination of V_cb written by Jan Erik Sundermann and published by . This book was released on 2007 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
