Resonance Parameters of the rho-Meson from Lattice QCD

Feng, Xu; Jansen, Karl; Renner, Dru B.

doi:10.1103/PhysRevD.83.094505

Resonance Parameters of the rho-Meson from Lattice QCD

Xu Feng
(
- NIC, Zeuthen and
- DESY, Zeuthen and
- Munster U., ITP
)
,
Karl Jansen
(
- NIC, Zeuthen and
- DESY, Zeuthen
)
,
Dru B. Renner
(
- NIC, Zeuthen and
- DESY, Zeuthen
)

Nov, 2010

25 pages

Published in:

Phys.Rev.D 83 (2011) 094505

e-Print:

1011.5288 [hep-lat]

DOI:

10.1103/PhysRevD.83.094505

Report number:

DESY-10-176,
SFB-CPP-10-117,
MS-TP-10-14,
KEK-CP-242,
JLAB-THY-10-1289

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Abstract: (arXiv)

We perform a non-perturbative lattice calculation of the P-wave pion-pion scattering phase in the rho-meson decay channel using two flavors of maximally twisted mass fermions at pion masses ranging from 480 MeV to 290 MeV. Making use of finite-size methods, we evaluate the pion-pion scattering phase in the center-of-mass frame and two moving frames. Applying an effective range formula, we find a good description of our results for the scattering phase as a function of the energy covering the resonance region. This allows us to extract the rho-meson mass and decay width and to study their quark mass dependence.

Note:

26 pages, 6 figures. v2: reference added, 1 figure added, typo corrected, published in PRD

12.38.Gc
11.15.Ha
13.75.Lb
pion-pion scattering phase
rho-meson resonance parameters
lattice QCD
pi pi: scattering
rho(770): mass: calculated
fermion: mass
mass: twist

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