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Charmed And Light Pseudoscalar Meson Decay Constants From Hisq Simulations
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Book Synopsis Charmed and Light Pseudoscalar Meson Decay Constants from HISQ Simulations by :
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 $
Book Synopsis Charmed and Strange Pseudoscalar Meson Decay Constants from HISQ Simulations by :
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:
Book Synopsis Charmed and Light Pseudoscalar Meson Decay Constants from Four-flavor Lattice QCD with Physical Light Quarks by :
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:
Book Synopsis Decay Constants of Charm and Beauty Pseudoscalar Heavy-light Mesons on Fine Lattices by :
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:
Book Synopsis A Measurement of the Pseudoscalar DecayConstant FDs Using Charm-Tagged Events in E+e- Collisions at the Y(4S). by : Jorg Stelzer
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.
Book Synopsis Interactions of Charmed Mesons with Light Pseudoscalar Mesons from Lattice QCD and Implications on the Nature of the D*s0(2317). by :
Download or read book Interactions of Charmed Mesons with Light Pseudoscalar Mesons from Lattice QCD and Implications on the Nature of the D*s0(2317). written by and published by . This book was released on 2014 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We study the scattering of light pseudoscalar mesons (p, K) off charmed mesons (D, D s) in full lattice QCD. The S -wave scattering lengths are calculated using Luscher's finite volume technique. We use a relativistic formulation for the charm quark. For the light quark, we use domain- wall fermions in the valence sector and improved Kogut-Susskind sea quarks. We calculate the scattering lengths of isospin-3/2 D[pi], D s[pi], D s K, isospin-0 DK and isospin-1 DK channels on the lattice. For the chiral extrapolation, we use a chiral unitary approach to next-to-leading order, which at the same time allows us to give predictions for other channels. It turns out that our results support the interpretation of the D*s0(2317) as a DK molecule. At the same time, we also update a prediction for the isospin breaking hadronic decay width G (D*s0(2317)2!D s[pi]) to (133± 22) keV.
Book Synopsis Decay Constants $f_B$ and $f_{B_s}$ and Quark Masses $m_b$ and $m_c$ from HISQ Simulations by :
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.
Book Synopsis Issues in General Physics Research: 2011 Edition by :
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/.
Book Synopsis Decay Constants of Heavy-light Pseudoscalars by :
Download or read book Decay Constants of Heavy-light Pseudoscalars written by and published by . This book was released on 1992 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A lattice calculation of the pseudoscalar decay constant for heavy-light mesons is reported. Emphasis is placed on preliminary results obtained using wall-source propagators at [beta] = 6.3. The previously-observed discrepancy between the static and conventional approaches appears to be much reduced.
Book Synopsis B- and D-meson Decay Constants from Three-flavor Lattice QCD. by :
Download or read book B- and D-meson Decay Constants from Three-flavor Lattice QCD. written by and published by . This book was released on 2012 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: We calculate the leptonic decay constants of B_{(s)} and D_{(s)} mesons in lattice QCD using staggered light quarks and Fermilab bottom and charm quarks. We compute the heavy-light meson correlation functions on the MILC asqtad-improved staggered gauge configurations which include the effects of three light dynamical sea quarks. We simulate with several values of the light valence- and sea-quark masses (down to m̃_s/10) and at three lattice spacings (a ̃0.15, 0.12, and 0.09 fm) and extrapolate to the physical up and down quark masses and the continuum using expressions derived in heavy-light meson staggered chiral perturbation theory. We renormalize the heavy-light axial current using a mostly nonperturbative method such that only a small correction to unity must be computed in lattice perturbation theory and higher-order terms are expected to be small. We obtain f_{B+̂} = 196.9(8.9) MeV, f_{B_s} = 242.0(9.5) MeV, f_{D+̂} = 218.9(11.3) MeV, f_{D_s} = 260.1(10.8) MeV, and the SU(3) flavor-breaking ratios f_{B_s}/f_{B} = 1.229(26) and f_{D_s}/f_{D} = 1.188(25), where the numbers in parentheses are the total statistical and systematic uncertainties added in quadrature.
Book Synopsis Decay Constants of P and D Wave Heavy Light Mesons by :
Download or read book Decay Constants of P and D Wave Heavy Light Mesons written by and published by . This book was released on 1996 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: We investigate decay constants of P- and D-wave heavy-light mesons within the mock-meson approach. Numerical estimates are obtained using the relativistic quark model. We also comment on recent calculations of heavy-light pseudo-scalar and vector decay constants.
Book Synopsis Decay Constants of Heavy-light Pseudoscalars by :
Download or read book Decay Constants of Heavy-light Pseudoscalars written by and published by . This book was released on 1992 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: A lattice calculation of the pseudoscalar decay constant for heavy-light mesons is reported. Emphasis is placed on preliminary results obtained using wall-source propagators at? = 6.3. The previously-observed discrepancy between the static and conventional approaches appears to be much reduced.
Book Synopsis Decay Constants and Wave Functions of Heavy-light Pseudoscalars by :
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:
Book Synopsis Decay Constants $f_B$ and $f_{B_s}$ from HISQ Simulations by :
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.
Book Synopsis Decay Constants and Wave Functions of Heavy-light Pseudoscalars by :
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.
Book Synopsis Radiative and Pionic Decays of Heavy-light Mesons Using HISQ Quarks by : Maysam Emadi
Download or read book Radiative and Pionic Decays of Heavy-light Mesons Using HISQ Quarks written by Maysam Emadi and published by . This book was released on 2015 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we use the highly improved staggered quark (HISQ) formalism to study the radiative and pionic transitions of charmed mesons within the framework of lattice QCD. The HISQ action is one of the most accurate formulations of charm quarks and is a result of a perturbative Symanzik improvement program to reduce lattice discretization errors. Decay widths are calculated in numerical simulations on an ensemble of gauge field configurations with $N_f=2+1$ asqtad sea quarks generated by the MILC collaboration. In addition we study $H_ŝ\ast$ and charmonium radiative decays as well as meson electric form factors. Experimental measurements of the decay ratios of vector charmed $D̂{\ast\pm0}$ and charmed strange $D_ŝ{\ast\pm}$ mesons, show a few curious features that are of great phenomenological interest in the study of low energy hadronic physics. Unlike most mesons, the strong hadronic decay modes of $D̂{\ast0}$ and $D_ŝ{\ast\pm}$, are not dominant. However, while the neutral $D$ has a radiative mode that is competitive with its pionic mode, the charged $D$ meson's radiative decay is highly suppressed relative to that of the neutral. This suppression provides a detailed probe of strong interactions and is apparently due to an interesting near cancellation that takes place between the photon's coupling to the charm quark and to the down antiquark. The results are in agreement with all of the available experimental data, and in particular, we show that the HISQ action successfully accounts for the near cancellation of the charmed $D̂{\ast\pm}$ radiative decay. The relative suppression is demonstrated in our result for the ratio of the radiative form factors of $D$ mesons $V̂\pm(0)/V̂0(0)=0.126(36)$ computed at heavier than physical $u/d$ quark masses. The quoted errors are purely statistical. Evidence from other lattice studies indicate small systematic errors in continuum and sea quark chiral extrapolations. Valence quark chiral extrapolation increases our errors by about 50\%. A rough extrapolation suggests an agreement with the measured radiative width within $2\sigma$.
Book Synopsis Decay Constants of Pseudoscalar Mesons Containing Heavy Quarks by : University of Rochester. Dept. of Physics and Astronomy
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:
