ua(1) anomaly - kek · 2010-11-08 · lattice results: jlqcd, prl101, 122002 (2010) and a full...
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UA(1) anomaly
give chiral condensate
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ρ(λ) = 1V
δ (λ − λk )k∑ ,
qq =1V
1m + iλkk
∑
limm→0
limV→∞
ρ(λ = 0) = Σπ
free quark
Banks, Casher (1980)
accumulation of near‐zero modes = “quark‐antiquark condensate”
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D = ρa1+ γ 5 sgn(aHW )⎡⎣ ⎤⎦ , aHW = γ 5(aDW − ρ)
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λk2 + m2( )
k∏
p‐regime ε‐regime
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Lattice results: JLQCD, PRL101, 122002 (2010) and a full paper (in preparation) • 2 and 2+1 flavors • p and e regimes (various quark masses) • 163x48 and 243x48 • various topological charges
pion zero‐mode integral pion loop
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ΣMS (2GeV) = [242(04)(−18+19 ) MeV]3
Σ(mud ,ms ) = Σ(0,ms ) ×
1− 3Mπ2
32π 2F2 lnMπ
2
µ2 +32L6Mπ
2
F2
⎡
⎣⎢
⎤
⎦⎥
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Derek Leinweber
χt =Q2
V= d 4x q(x)q(0)∫
JLQCD, PLB665, 294 (2008)
Aoki et al, PRD76, 054508 (2007)
Near‐zero modes dominates in the disconnected diagrams
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χt = mΣ / N f , or
χt =Σ
mu−1 + md
−1 + ms−1
Crewther (1977), Leutwyler‐Smilga (1992)
Nf=2+1
Nf=2
ΣMS (2GeV) = [247(03)(XX) MeV]3
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Σ ≡ − qq = 0
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non‐singlet singlet
scalar δ σ
pseudo‐scalar π η’ UA(1)
χπ − χδ = d 4x jπ (x) jπ (0) − jδ (x) jδ (0) = dλρ(λ) 4m2
λ2 + m2( )2∫∫
Near‐zero mode dominates. Others m2 → 0
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Σ = dλρ(λ) 2mλ2 + m2∫ = 0
χπ − χδ = dλρ(λ) 4m2
λ2 + m2( )2∫ = 0
Shuryak (1994), Cohen (1996).
always occurs together?
ρ(λ) ~ m2δ (λ)
Schafer (1996) Instanton Liquid Model see also, Lee, Hatsuda (1996)
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β a (fm) T (MeV) T/Tc
2.35 0.13 250 0.86
…
2.445 0.114 288 1
…
2.55 0.094 350 1.20
β a (fm) T (MeV) T/Tc
2.18 0.144 172 0.90
2.20 0.139 177 0.93
2.30 0.118 209 1.09
2.40 0.101 243 1.27
2.45 0.094 262 1.38
Tc = 190 MeV (fixed)
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Tc
1.2 Tc
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limx→∞
q(x)q(0)Q= limx→∞
mP(x)mP(0)Q= − 1V
χt −Q2
V+c42χtV
...⎛
⎝⎜⎞
⎠⎟+O(e−mη 'x )
fP1
p2 + mπ2 m0
2 1p2 + mπ
2 fP + const
~ fP2m0
2
4mπ3 (1+ mπ x)e
−mπ x + const
β=2.40. am=0.025, 0.01 Approx the disconnected diagram by only the near‐zero modes:
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Gattringer et al. (2002) 163x6
T=0: ~ 191(5) MeV Del Debbio et al. (2008)
ours, 243x6
Difference need to be understood, c4/χtV ?
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T ~ 1.1 Tc
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ρ(λ) ~ m2δ (λ)
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