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Author :
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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (16 download)
Download or read book Charmed and Strange Pseudoscalar Meson Decay Constants from HISQ Simulations written by and published by . This book was released on 2013 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Charmed and Light Pseudoscalar Meson Decay Constants from HISQ Simulations written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We compute the leptonic decay constants $f_{D^+}$, $f_{D_s}$, and $f_{K^+}$, and the quark-mass ratios $m_c/m_s$ and $m_s/m_l$ in unquenched lattice QCD. We use the MILC highly improved staggered quark (HISQ) ensembles with four dynamical quark flavors. Our primary results are $f_{D^+} = 212.6(0.4)({}^{+1.0}_{-1.2})\ \mathrm{MeV}$, $f_{D_s} = 249.0(0.3)({}^{+1.1}_{-1.5})\ \mathrm{MeV}$, and $f_{D_s}/f_{D^+} = 1.1712(10)({}^{+29}_{-32})$, where the errors are statistical and total systematic, respectively. We also obtain $f_{K^+}/f_{\pi^+} = 1.1956(10)({}^{+26}_{-18})$, updating our previous result, and determine the quark-mass ratios $m_s/m_l = 27.35(5)({}^{+10}_{-7})$ and $m_c/m_s = 11.747(19)({}^{+59}_{-43})$. When combined with experimental measurements of the decay rates, our results lead to precise determinations of the CKM matrix elements $
Download or read book Charmed and Light Pseudoscalar Meson Decay Constants from Four-flavor Lattice QCD with Physical Light Quarks written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jorg Stelzer
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ISBN 13 :
Total Pages : 261 pages
Book Rating : 4.:/5 (316 download)
Download or read book A Measurement of the Pseudoscalar DecayConstant FDs Using Charm-Tagged Events in E+e- Collisions at the Y(4S). written by Jorg Stelzer and published by . This book was released on 2006 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: The decay constant f{sub D{sub s}} of the pseudoscalar strange charm meson D{sub s}{sup +} is an important benchmark test of the theoretical methods that quantitatively describe the nonperturbative low-energy regime of QCD, the theory of the strong interaction. A confirmation of the validity of these predictive methods, foremost lattice QCD, in the sector of heavy-light meson decay constants increases trust in the calculation of f{sub B}, which is an important number for the measurement of the CKM matrix element V{sub td} in B{sup 0}{bar B}{sup 0}-mixing events. From October 1999 through July 2004, the BABAR experiment, located at the PEP-II storage ring at the Stanford Linear Accelerator Center, collected 230.2 fb{sup -1} of data in e{sup +}e{sup -} collision at {radical}s = 10.58 GeV. In this thesis, these data are searched for e{sup +}e{sup -} {yields} c{bar c} events by identifying sets of charged and neutral pions and charged kaons, consistent with the decay of a charm meson, D{sup 0}, D{sup +}, D{sub s}{sup +}, or D*{sup +}. A sample of 510,000 charmed mesons with a momentum consistent with e{sup +}e{sup -} {yields} c{bar c} events is identified.
Author : University of Rochester. Dept. of Physics and Astronomy
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ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (632 download)
Download or read book Decay Constants of Pseudoscalar Mesons Containing Heavy Quarks written by University of Rochester. Dept. of Physics and Astronomy and published by . This book was released on with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.:/5 (18 download)
Download or read book Decay Constants of Charm and Beauty Pseudoscalar Heavy-light Mesons on Fine Lattices written by and published by . This book was released on 2007 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Publisher : ScholarlyEditions
ISBN 13 : 1464963282
Total Pages : 8864 pages
Book Rating : 4.4/5 (649 download)
Download or read book Issues in General Physics Research: 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 8864 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in General Physics Research / 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about General Physics Research. The editors have built Issues in General Physics Research: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about General Physics Research in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in General Physics Research: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Download or read book Flavour Breaking Effects in the Pseudoscalar Meson Decay Constants written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (93 download)
Download or read book Leptonic B- and D-Meson Decay Constants with 2+1 Flavors of Asqtad Fermions written by and published by . This book was released on 2015 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the status of our updated D- and B-meson decay-constant analysis, based on the MILC Nf =2+1 asqtad gauge ensembles. Heavy quarks are incorporated using the Wilson clover action with the Fermilab interpretation. This analysis includes ensembles at five lattice spacings from [alpha] ≈ 0.045 to 0.15 fm, and light sea-quark masses down to 1/20th of the strange-quark mass. Projected error budgets for ratios of decay constants, in particular between bottom- and charm-meson decay constants, are presented.
Download or read book Decay Constants $f_B$ and $f_{B_s}$ and Quark Masses $m_b$ and $m_c$ from HISQ Simulations written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a progress report on our calculation of the decay constants $f_B$ and $f_{B_s}$ from lattice-QCD simulations with highly-improved staggered quarks. Simulations are carried out with several heavy valence-quark masses on $(2+1+1)$-flavor ensembles that include charm sea quarks. We include data at six lattice spacings and several light sea-quark masses, including an approximately physical-mass ensemble at all but the smallest lattice spacing, 0.03 fm. This range of parameters provides excellent control of the continuum extrapolation to zero lattice spacing and of heavy-quark discretization errors. Finally, using the heavy-quark effective theory expansion we present a method of extracting from the same correlation functions the charm- and bottom-quark masses as well as some low-energy constants appearing in the heavy-quark expansion.
Author : I. Bediaga
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (354 download)
Download or read book Pseudoscalar Mesons and Scalar Diquarks Decay Constants written by I. Bediaga and published by . This book was released on 1983 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (873 download)
Download or read book B and D Meson Decay Constants from 2+1 Flavor Improved Staggered Simulations written by and published by . This book was released on 2011 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We give an update on simulation results for the decay constants f{sub B}; f{sub B{sub s}}, f{sub D} and f{sub D{sub s}}. These decay constants are important for precision tests of the standard model, in particular entering as inputs to the global CKM unitarity triangle fit. The results presented here make use of the MILC (2+1)-flavor asqtad ensembles, with heavy quarks incorporated using the clover action with the Fermilab method. Partially quenched, staggered chiral perturbation theory is used to extract the decay constants at the physical point. In addition, we give error projections for a new analysis in progress, based on an extended data set.
Download or read book Leptonic Decays of Charged Pseudoscalar Mesons - 2015 written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We review the physics of purely leptonic decays of $\pi^\pm$, $K^\pm$, $D^{\pm}$, $D_s^\pm$, and $B^\pm$ pseudoscalar mesons. The measured decay rates are related to the product of the relevant weak-interaction-based CKM matrix element of the constituent quarks and a strong interaction parameter related to the overlap of the quark and antiquark wave-functions in the meson, called the decay constant $f_P$. The leptonic decay constants for $\pi^\pm$, $K^\pm$, $D^{\pm}$, $D_s^\pm$, and $B^\pm$ mesons can be obtained with controlled theoretical uncertainties and high precision from {\it ab initio} lattice-QCD simulations. The combination of experimental leptonic decay-rate measurements and theoretical decay-constant calculations enables the determination of several elements of the CKM matrix within the standard model. These determinations are competitive with those obtained from semileptonic decays, and also complementary because they are sensitive to different quark flavor-changing currents. They can also be used to test the unitarity of the first and second rows of the CKM matrix. Conversely, taking the CKM elements predicted by unitarity, one can infer "experimental" values for $f_P$ that can be compared with theory. These provide tests of lattice-QCD methods, provided new-physics contributions to leptonic decays are negligible at the current level of precision. This review is the basis of the article in the Particle Data Group's 2016 edition, updating the versions in Refs. [1-3].
Author : Benoit Blossier
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ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (436 download)
Download or read book Pseudoscalar Decay Constants of Kaon and D-mesons from Nf written by Benoit Blossier and published by . This book was released on 2009 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Decay Constants $f_B$ and $f_{B_s}$ from HISQ Simulations written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We give a progress report on a project aimed at a high-precision calculation of the decay constants $f_B$ and $f_{B_s}$ from simulations with HISQ heavy and light valence and sea quarks. Calculations are carried out with several heavy valence-quark masses on ensembles with 2+1+1 flavors of HISQ sea quarks at five lattice spacings and several light sea-quark mass ratios $m_{ud}/m_s$, including approximately physical sea-quark masses. This range of parameters provides excellent control of the continuum limit and of heavy-quark discretization errors. We present a preliminary error budget with projected uncertainties of 2.2~MeV and 1.5~MeV for $f_B$ and $f_{B_s}$, respectively.
Author : Dean Junyuel Lee
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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (769 download)
Download or read book A Simple Model of Two-body Decays of Charmed Mesons Into Pseudoscalar Mesons Using 1/N Expansion written by Dean Junyuel Lee and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (893 download)
Download or read book Decay Constants and Wave Functions of Heavy-light Pseudoscalars written by and published by . This book was released on 1990 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: Calculations of the pseudoscalar decay constant for mesons containing one heavy quark (i.e., f{sub D}, f{sub B}) are reported. Results at [beta] = 6.0 using the static-quark approximation for the heavy-quark propagator are compared to results using a propagating heavy quark with Wilson fermions at ([beta] = 6.0, [beta] = 6.1 and [beta] = 6.3). Further investigation into the dynamics governing these systems is made by measuring the Bethe-Salpeter wave function for each case. 15 refs., 5 figs., 1 tab.
