Charm quark system at the physical point of 2+1 flavor lattice QCD

Journal Article · Sat Oct 01 00:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.84.074505· OSTI ID:21607800

Namekawa, Y; Ukita, N ^[1]; Aoki, S; Ishizuka, N; Taniguchi, Y; Ukawa, A; Yoshie, T ^[1]; Ishikawa, K -I; Okawa, M ^[2]; Izubuchi, T ^[3]; Kanaya, K ^[4]; Kuramashi, Y ^[1]

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1. Center for Computational Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8577 (Japan)
2. Graduate School of Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526 (Japan)
3. Riken BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973 (United States)
4. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571 (Japan)

We investigate the charm quark system using the relativistic heavy quark action on 2+1 flavor PACS-CS configurations previously generated on 32{sup 3}x64 lattice. The dynamical up, down, and strange quark masses are set to the physical values by using the technique of reweighting to shift the quark-hopping parameters from the values employed in the configuration generation. At the physical point, the lattice spacing equals a{sup -1}=2.194(10) GeV and the spatial extent L=2.88(1) fm. The charm quark mass is determined by the spin-averaged mass of the 1S charmonium state, from which we obtain m{sub charm}{sup MS}({mu}=m{sub charm}{sup MS})=1.260(1)(6)(35) GeV, where the errors are due to our statistics, scale determination and renormalization factor. An additional systematic error from the heavy quark is of order {alpha}{sub s}{sup 2}f(m{sub Q}a)(a{Lambda}{sub QCD}), f(m{sub Q}a)(a{Lambda}{sub QCD}){sup 2}, which are estimated to be a percent level if the factor f(m{sub Q}a) analytic in m{sub Q}a is of order unity. Our results for the charmed and charmed-strange meson decay constants are f{sub D}=226(6)(1)(5) MeV, f{sub D{sub s}}=257(2)(1)(5) MeV, again up to the heavy quark errors of order {alpha}{sub s}{sup 2}f(m{sub Q}a)(a{Lambda}{sub QCD}), f(m{sub Q}a)(a{Lambda}{sub QCD}){sup 2}. Combined with the CLEO values for the leptonic decay widths, these values yield |V{sub cd}|=0.205(6)(1)(5)(9), |V{sub cs}|=1.00(1)(1)(3)(3), where the last error is because of the experimental uncertainty of the decay widths.

• OSTI ID: 21607800
• Journal Information: Physical Review. D, Particles Fields, Vol. 84, Issue 7; Other Information: DOI: 10.1103/PhysRevD.84.074505; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
C QUARKS
CESR STORAGE RING
CHARMONIUM
FLAVOR MODEL
GEV RANGE 01-10
LATTICE FIELD THEORY
LEPTONIC DECAY
MASS
MEV RANGE 100-1000
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PERTURBED ANGULAR CORRELATION
QUANTUM CHROMODYNAMICS
RELATIVISTIC RANGE
RENORMALIZATION
S QUARKS
SPIN
STRANGE MESONS
T QUARKS
ANGULAR CORRELATION
ANGULAR MOMENTUM
BASIC INTERACTIONS
BEAUTY PARTICLES
BOSONS
CHARM PARTICLES
COMPOSITE MODELS
CONSTRUCTIVE FIELD THEORY
CORRELATIONS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
GEV RANGE
HADRONS
INTERACTIONS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MESONS
MEV RANGE
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
POSTULATED PARTICLES
QUANTUM FIELD THEORY
QUARK MODEL
QUARKONIUM
QUARKS
SPECTROMETERS
STORAGE RINGS
STRANGE PARTICLES
TOP PARTICLES
WEAK INTERACTIONS
WEAK PARTICLE DECAY