Download or read book The Ds and D Leptonic Decay Constants from Lattice QCD written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the leptonic decay constants f{sub D{sub s}} and f{sub D{sup +}} computed on the MILC collaboration's 2+1 flavor asqtad gauge ensembles. We use clover heavy quarks with the Fermilab interpretation and improved staggered light quarks. The simultaneous chiral and continuum extrapolation, which determines both decay constants, includes partially-quenched lattice results at lattice spacings a (almost equal to) 0.09, 0.12 and 0.15 fm. We have made several recent improvements in our analysis: (a) we include terms in the fit describing leading order heavy-quark discretization effects, (b) we have adopted a more precise input r1 value consistent with our other D and B meson studies, (c) we have retuned the input bare charm masses based upon the new r1. Our preliminary results are f{sub D{sub s}} = 260 ± 10 MeV and f{sub D{sup +}} = 217 ± 10 MeV.
Download or read book The Decay Constants F B and F D from Three flavor Lattice QCD written by and published by . This book was released on 2007 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present new preliminary results for the leptonic decay constants f{sub B} and f{sub D+} determined in 2+1 flavor lattice QCD at lattice spacings a = 0.09, 0.12 and 0.15 fm. Results are obtained using the MILC Collaboration gauge configuration ensembles, clover heavy quarks in the Fermilab interpretation and improved staggered light quarks. Decay constants, computed at partially quenched combinations of the valence and sea light quark masses, are used to determine the low-energy parameters of staggered chiral perturbation theory. The physical decay constants are found in an extrapolation using the parameterized chiral formula.
Download or read book The Decay Constants FDs and FD Form Lattice QCD written by and published by . This book was released on 2011 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent calculations of the decay constants in lattice QCD are reviewed and compared to experiment. The decay constants are tabulated in Table 2 and plotted in Figure 2. The most precise f{sub Ds} value is from HPQCD. It is about 2[sigma] higher than their previous result. The change is due to a more precise determination of the lattice spacing and better tuning of the quark masses. They have updated f{sub D+} using the new f{sub Ds} and their older f{sub Ds}/f{sub D+} ratio which is expected to be less sensitive to mistuning of the lattice spacing and masses. The preliminary FNAL/MILC f{sub Ds} value is about 1.4[sigma] higher than the HPQCD result but with a larger error. The f{sub D+} values, however, are in better agreement. FNAL/MILC expect to finalize their results once the charm quark mass tuning is complete. The two flavor ETM f{sub D+} value is about 1.6[sigma] lower than the HPQCD value while f{sub Ds} is in better agreement. It is not clear how much of the difference is from neglecting the strange sea quark, given the errors. Lattice and experiment differ most significantly for f{sub Ds}. Figure 3 shows Kronfeld's (updated) history of f{sub Ds}. The yellow bands depict the evolution of the experimental average while the three-flavor lattice average is shown in grey. The right-hand scale and green lines show the differences in sigmas. The 3.8[sigma] discrepancy around t ≈ 2 provoked the 'f{sub Ds} puzzle'. That discrepancy has now shrunk to 1.6[sigma]. Future lattice and experiment will be decisive.
Download or read book Extraction of Leptonic D Meson Decay Constants by Means of 3 flavour Lattice QCD written by Kevin Eckert and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book XX International Symposium on Lepton and Photon Interactions at High Energies written by Juliet Lee-Franzini and published by World Scientific. This book was released on 2002 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important book covers topics that are of major interest to the high energy physics community, including the most recent results from flavour factories, dark matter and neutrino physics. In addition, it considers future high energy machines.
Download or read book High Energy Physics written by and published by World Scientific. This book was released on 1981 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lepton photon 01 Proceedings Of The Xx International Symposium On Lepton And Photon Interactions At High Energies written by Fabio Bossi and published by World Scientific. This book was released on 2002-08-08 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: This important book covers topics that are of major interest to the high energy physics community, including the most recent results from flavour factories, dark matter and neutrino physics. In addition, it considers future high energy machines.
Download or read book Particle Physics At The Start Of The New Millenniums Procs Of The Ninth Lomonosov Conf On Elementary Particle Physics written by Alexander I Studenikin and published by World Scientific. This book was released on 2001-05-18 with total page 253 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume deals with a wide variety of topics in particle physics, in both theory and experiment.
Download or read book 30 Years Of Bes Physics Proceedings Of The Symposium On 30 Years Of Bes Physics written by Changzheng Yuan and published by World Scientific. This book was released on 2020-06-05 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: BES, the Beijing Spectrometer, began its first groundbreaking physics run, thirty years ago, in 1989. This is the first high energy physics experiment in China, and has been unique throughout the world for its thorough and extended coverage of the tau and charm energy region. Since then, the BES detector has undergone steady improvements, upgrading to BESII in 1998 and to BESIII in 2008. Over the same period, the collaboration has expanded from 150 members, across 10 institutions in China and the United States, to about 500 members, across 72 institutions and 15 countries. The physics program, too, has extended from light hadron spectroscopy, tau, and charm physics to the discovery of exotic charmonium-like states, precision tests of the Standard Model of particle physics, and searches for new physics beyond the Standard Model.This special volume collects the proceedings of the symposium held at the Institute of High Energy Physics, Beijing, in celebration of the 30-year span of achievements and progress at the BES, BESII, and BESIII experiments. Written by many leaders of the BES collaborations, these proceedings document the early days of the BES experiments, important milestones, and the future physics program at BESIII.
Download or read book The D s D B s and B Decay Constants from 2 1 Flavor Lattice QCD written by and published by . This book was released on 2013 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particle Physics at the Start of the New Millennium written by A. I. Studenikin and published by World Scientific. This book was released on 2001 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume deals with a wide variety of topics in particle physics, in both theory and experiment. Contents: On the Fundamental Symmetries in Particle Physics (E Shabalin); Chiral Symmetry in Lattice QCD (A Slavnov); Two-Photon Physics at LEP (G Passaleva); Color Reconnection and Bose-Einstein Correlations at LEP2 (Th Ziegler); A NLO QCD Analysis of the Spin Structure Function g 1 and Higher Twist Correlations (E Leader et al.); Heavy Quark Asymmetries (A Tricomi); Experimental Signature of a Fermiophobic Higgs Boson (L Brecher & R Santos); The AMS Experiment: First Results and Physics Prospects (J P Vialle); Neutrino Conversions in Active Galactic Nuclei (A Husain); Lepton Production by Neutrinos in an External Electromagnetic Field (A Borisov & N Zamorin); Mixing and CP Violation with Quasidegenerate Majorana Neutrinos (G Branko et al.); Solar Neutrino Oscillations in Extensions of the Standard Model (O Boyarkin); Covariant Treatment of Neutrino Spin (Flavour) Conversion in Matter Under the Influence of Electromagnetic Fields (M Dvornikov et al.); Pulsar Velocity Puzzle and Nonstandard Neutrino Oscillations (R Horvat); Kinematic Projecting of Pulsar Profiles (V Bordovitsyn et al.); Late Gravitational Collapse, Quantum Miniholes and the Birth of a New Universe (M Fil''chenkov); On Adelic Strings (B Dragovich); Collider Searches for TeV Scale Quantum Gravity with Compact Extra Dimensions (P Azzurri); and other papers. Readership: High energy physicists and astrophysicists.
Download or read book Particle Physics On The Eve Of Lhc Proceedings Of The 13th Lomonosov Conference On Elementary Particle Physics written by Alexander I Studenikin and published by World Scientific. This book was released on 2009-01-05 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume is devoted to a wide variety of items, both in theory and experiment, of particle physics such as tests of the Standard Model and beyond, physics at the future accelerators, neutrino and astroparticle physics, heavy quark physics, non-perturbative QCD, quantum gravity effects and cosmology. It is important that the papers in this volume reveal the present status and new developments in the above-mentioned items on the eve of a new era that starts with the Large Hadron Collider (LHC).
Download or read book 16th Conference on Flavor Physics and CP Violation written by Anjan Giri and published by Springer Nature. This book was released on 2019-11-13 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting the proceedings of FPCP 2018, this book reviews the status quo of flavor physics and discusses the latest findings in this exciting area. Flavor physics has been instrumental in the formulation and understanding of the standard model, and it is possible that the direction of new physics will be significantly influenced by flavor sector, also known as the intensity frontier, making it possible to indirectly test the existence of new physics up to a very high scale, beyond that of the energy frontier scale accessible at the LHC. The book is intended for academics around the globe involved in particle physics research, professionals associated with the related technologies and those who are interested in learning about the future of physics and its prospects and directions.
Download or read book Decay Constants of B and D Mesons from Non pertubatively Improved Lattice QCD written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The decay constants of B and D mesons are computed in quenched lattice QCD at two different values of the coupling. The action and operators are? (a) improved with non-perturbative coefficients where available. The results and systematic errors are discussed in detail. Results for vector decay constants, flavour symmetry breaking ratios of decay constants, the pseudoscalar-vector mass splitting and D meson masses are also presented.
Download or read book Predictions with Lattice QCD written by Andreas S. Kronfeld and published by . This book was released on 2006 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, they used lattice QCD to calculate some quantities that were unknown or poorly known. They are the q{sup 2} dependence of the form factor in semileptonic D {yields} Kl{nu} decay, the leptonic decay constants of the D{sup +} and D{sub s} mesons, and the mass of the B{sub c} meson. In this paper, they summarize these calculations, with emphasis on their (subsequent) confirmation by measurements in e{sup +}e{sup -}, {gamma}p and {bar p}p collisions.
Download or read book Lattice 91 written by M. Fukugita and published by Elsevier. This book was released on 2016-06-03 with total page 699 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lattice 91 covers the proceedings of the International Symposium on Lattice Field Theory held in Tsukuba, Japan on 5-9 November 1991. The book focuses on quantum chromodynamics, Higgs-fermion theories, QED, lattice quantum gravity and random surfaces, spin systems related to field theory, simulation algorithms, and dedicated computers. The selection first offers information on the QCD spectrum and phase diagram on the lattice and QCD at finite density, including phase structure of QCD, Monte-Carlo simulations with dynamical fermions, and quenched approximation. The book then tackles weak matrix elements, simulation of heavy quarks, and sphaleron induced baryon number non-conservation. The text reviews quantum gravity and random surfaces, recent analytic progress in finite size effects, and parallel QCD machines. Discussions focus on two-dimensional quantum gravity, signatures of resonance in finite volume, first order transitions, and determination of the running coupling. The publication also ponders on hadronic forces from the lattice, universality of the confinement string in multiple potentials, and confinement and saddle-point configurations. The selection is highly recommended for readers interested in the lattice field theory.
