Nucleon strange quark content from $N_f=2+1$ lattice QCD with exact chiral symmetry - INSPIRE

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Nucleon strange quark content from $N_f=2+1$ lattice QCD with exact chiral symmetry

JLQCD

Collaboration

•

H. Ohki
(
- KMI, Nagoya
)

Aug, 2012

13 pages

Published in:

Phys.Rev.D 87 (2013) 034509

Published: Feb 15, 2013

e-Print:

1208.4185 [hep-lat]

DOI:

10.1103/PhysRevD.87.034509

Report number:

KEK-CP-276

View in:

ADS Abstract Service

reference search108 citations

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Abstract: (APS)

We calculate the strange quark content of the nucleon ⟨N|s¯s|N⟩ in 2+1 -flavor lattice QCD. Chirally symmetric overlap fermion formulation is used to avoid the contamination from up and down quark contents due to an operator mixing between strange and light scalar operators, s¯s and u¯u+d¯d. At a lattice spacing a=0.112(1) fm, we perform calculations at four values of degenerate up and down quark masses mud, which cover a range of the pion mass Mπ≃300–540 MeV. We employ two different methods to calculate ⟨N|s¯s|N⟩. One is a direct method where we calculate ⟨N|s¯s|N⟩ by directly inserting the s¯s operator. The other is an indirect method where ⟨N|s¯s|N⟩ is extracted from a derivative of the nucleon mass in terms of the strange quark mass. With these two methods we obtain consistent results for ⟨N|s¯s|N⟩ with each other. Our best estimate fTs=ms⟨N|s¯s|N⟩/MN=0.009(15)stat(16)sys is in good agreement with our previous studies in two-flavor QCD.

Note:

26 pages, 25 eps figures; v2: minor corrections, a reference added, version published in PRD

11.15.Ha
12.38.Gc
14.20.Dh
quark: mass
operator: scalar
nucleon: mass
operator: mixing
pi: mass
fermion: overlap
lattice field theory

References(41)

Figures(26)

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