Published July 2016 | Version v1
Journal article Metadata-only

Two-photon decays of ηc from lattice QCD

Creators

  • 1. Peking University, School of Physics, Beijing (China)
  • 2. Chinese Academy of Sciences, Institute of High Energy Physics, Beijing (China)
  • 3. Xi'an Technological University, School of Science, Xi'an (China)
  • 4. Collaborative Innovation Center of Quantum Matter, Beijing (China)
  • 5. Peking University, School of Physics and Center for High Energy Physics, Beijing (China)
  • 6. Nankai University, School of Physics, Tianjin (China)
  • 7. Chinese Academy of Sciences, Institute of Theoretical Physics, Beijing (China)
  • 8. Zhejiang University, Department of Physics, Hangzhou (China)

Description

We present an exploratory lattice study for the two-photon decay of ηc using Nf = 2 twisted mass lattice QCD gauge configurations generated by the European Twisted Mass Collaboration. Two different lattice spacings of a = 0.067 fm and a = 0.085 fm are used in the study, both of which are of physical size of 2 fm. The decay widths are found to be 1.025(5) KeV for the coarser lattice and 1.062(5) KeV for the finer lattice, respectively, where the errors are purely statistical. A naive extrapolation toward the continuum limit yields γ ≅ 1.122(14) KeV, which is smaller than the previous quenched result and most of the current experimental results. Possible reasons are discussed. (orig.)

Availability note (English)

Available from: http://dx.doi.org/10.1140/epjc/s10052-016-4212-8

Additional details

Identifiers

DOI
10.1140/epjc/s10052-016-4212-8;

Publishing Information

Journal Title
European Physical Journal. C, Particles and Fields (Online)
Journal Volume
76
Journal Issue
7
Journal Page Range
p. 1-12
ISSN
1434-6052

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
47097878
Subject category
S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
BOUNDARY CONDITIONS; COMPUTERIZED SIMULATION; DISPERSION RELATIONS; EFFECTIVE MASS; ELECTROMAGNETIC FORM FACTORS; ETA C-2980 MESONS; EXTRAPOLATION; LATTICE FIELD THEORY; LATTICE PARAMETERS; PARTICLE WIDTHS; QUANTUM CHROMODYNAMICS; RADIATIVE DECAY; REST MASS; RHO-770 MESONS; THEORETICAL DATA
Descriptors DEC
BOSONS; CHARMONIUM; CONSTRUCTIVE FIELD THEORY; DATA; DECAY; DIMENSIONLESS NUMBERS; ELEMENTARY PARTICLES; FIELD THEORIES; FORM FACTORS; HADRONS; INFORMATION; MASS; MATHEMATICAL SOLUTIONS; MESONS; NUMERICAL DATA; NUMERICAL SOLUTION; PARTICLE DECAY; PARTICLE PROPERTIES; PSEUDOSCALAR MESONS; QUANTUM FIELD THEORY; QUARKONIUM; SIMULATION; VECTOR MESONS

Optional Information

Collaborations
CLQCD Collaboration