Axion phenomenology and θ-dependence from Nif=2+1 lattice QCD

被引：128

作者：

Bonati, Claudio ^{[1
,2
]}

D'Elia, Massimo ^{[1
,2
]}

Mariti, Marco ^{[1
,2
]}

Martinelli, Guido ^{[3
,4
]}

Mesiti, Michele ^{[1
,2
]}

Negro, Francesco ^{[2
]}

Sanfilippo, Francesco ^{[5
]}

Villadoro, Giovanni ^{[6
]}

机构：

[1] Univ Pisa, Dipartimento Fis, Largo Pontecorvo 3, I-56127 Pisa, Italy

[2] Ist Nazl Fis Nucl, Sez Pisa, Largo Pontecorvo 3, I-56127 Pisa, Italy

[3] Univ Roma La Sapienza, Dipartimento Fis, Piazzale Aldo Moro 5, I-00185 Rome, Italy

[4] Ist Nazl Fis Nucl, Sez Roma La Sapienza, Piazzale Aldo Moro 5, I-00185 Rome, Italy

[5] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[6] Abdus Salam Int Ctr Theoret Phys, Str Costiera 11, I-34151 Trieste, Italy

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2016年 / 03期

关键词：

CP violation; Lattice QCD; TOPOLOGICAL SUSCEPTIBILITY; CP CONSERVATION; MONTE-CARLO; INSTANTONS; CHARGE; ZERO;

D O I：

10.1007/JHEP03(2016)155

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We investigate the topological properties of N-f = 2 + 1 QCD with physical quark masses, both at zero and finite temperature. We adopt stout improved staggered fermions and explore a range of lattice spacings a similar to 0.05-0.12 fm. At zero temperature we estimate both finite size and finite cut-off effects, comparing our continuum extrapolated results for the topological susceptibility chi with predictions from chiral perturbation theory. At finite temperature, we explore a region going from T-c up to around 4 T-c, where we provide continuum extrapolated results for the topological susceptibility and for the fourth moment of the topological charge distribution. While the latter converges to the dilute instanton gas prediction the former differs strongly both in the size and in the temperature dependence. This results in a shift of the axion dark matter window of almost one order of magnitude with respect to the instanton computation.

引用

页数：27

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