update on current status and future plans for milc and ... · use sχpt(aubin & bernard), i.e....
TRANSCRIPT
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Update on current status and futureplans for MILC and MILC/FNAL
projectsSteven Gottlieb, Indiana University
sg at indiana.edu
ILFT 4, Sokendai, 3/11/06 S. Gottlieb – p. 1/41
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Collaborators
MILC Collaboration: E. Gregory, C. Aubin, R. Sugar,U. Heller, J. Hetrick, S. G., C. Bernard, C. DeTar, J. Osborn,D. Toussaint, B. Billeter, L. Levkova, F. Maresca, D. Renner+ HPQCD & UKQCD Collaborations (for scale, ms, m̂,ms/m̂):C. Davies, A. Gray, J. Hein, G. P. Lepage, Q. Mason,J. Shigemitsu, H. Trottier, M. Wingate+ FNAL Collaboration (for heavy-light decays):A.S. Kronfeld, M. Di Pierro, E. D. Freeland, A.X. El-Khadra,P.B. Mackenzie, D. Menscher, M. Nobes, M. Okamoto, M.B.Oktay, J. Simone
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Outline
Outline of MILC Projects
Ensemble of Configurations
Recent Results
Future Plans
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Outline of MILC Projects
MILC’s physics interests are varied:
Light quarksπ, K decay constantsquark massesspectrum, including exotics
Heavy quarksleptonic decay constantssemi-leptonic decay form factors
Topology
High temperature QCD
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Ensemble of Configurations
To carry out a simulation we must select certain physicalparameters:
lattice spacing (a) or gauge coupling (β)
grid size (N3s ×Nt)
sea quark masses (mu,d, ms)
To control systematic error we must
take continuum limit
take infinite volume limit
extrapolate to light quark mass; can work at physical squark mass
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MILC has been generating three flavor configurations toallow control of these errors. Many configurations areavailable to others through NERSC Gauge Connection.Some new configurations generated via SciDAC program.
a = 0.09 fm; 283 × 96
amu,d / ams 10/g2 # config.0.031 / 0.031 7.18 4960.0124 / 0.031 7.11 5270.0062 / 0.031 7.09 592
a = 0.09 fm; 403 × 96
0.0031 / 0.031 7.08 ≈ 420 (100)
Value in blue is ensemble size at time of ILFT 1 in Izu.
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a = 0.12 fm; 203 × 64
amu,d / ams 10/g2 # config.0.40 /0.40 7.35 3320.20 /0.20 7.15 3410.10 /0.10 6.96 3390.05 /0.05 6.85 4250.04 /0.05 6.83 3510.03 /0.05 6.81 5640.02 /0.05 6.79 4840.01 /0.05 6.76 6580.007/0.05 6.76 4930.03 /0.03 6.75 3500.01 /0.03 6.75 350
a = 0.12 fm; 243 × 64
0.005/0.05 6.76 500 (375)
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Additional EnsemblesThese two tables correspond to “fine” and “coarse”lattice spacings.
To better control continuum limit, we have:Extra coarse: a ≈ 0.18 fmMedium coarse: a ≈ 0.15 fmExtra fine: a ≈ 0.06 fm. This is a challenging projectand will require more than a year to “complete.”Currently have about 850 time units with ml = 0.4ms.For ml = 0.2ms just equilibrating.
The best way to control the continuum limit is to usesmaller lattice spacing, but it is very expensive. Bydoing the much less demanding larger lattice spacingswe hope better control the limit, or at least betterestimate our systematic error.
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MILC Ensembles
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MILC Ensembles
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MILC Ensembles
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Taste symmetry restoration
m2πS
−m2πG
= (435MeV)2[a = 0.12], (152MeV)2[a = 0.06]
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Static Quark Potential
Potential looks very similar at different lattice spacings afterrescaling according to the lattice spacing.
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π, K decay constants
continuum χPT fit to both fπ and mπ fails badly
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Next two slides show improved fit:
Use SχPT(Aubin & Bernard), i.e. including tastebreaking plus NNLO corrections
Points plotted after finite volume correction
Partially quenched data used, so not all points plotted
After fit, we:
Extrapolate fit parameters to continuum
Show difference between m′
s (simulation strange mass)and ms (correct value)
Details in hep-lat/0407028 = PRD70, 114501 (2004)
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Preliminary Results with New Configs
Two fits have 556 and 488 dof. The 0.0031/0.031 fine run ispulling the results down. This run was only 1/3 done whenanalysis done. Statistical fluctuation? Variation included insystematic error. (PoS(Lattice05) 025)
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Extend range to includeKPreliminary
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Results for light decay constantsfπ = 128.6 ± 0.6 ± 2.5 MeV(129.5 ± 0.9 ± 3.5)
fK = 154.3 ± 0.6 ± 3.0 MeV(156.6 ± 1.0 ± 3.6)
fK/fπ = 1.198(3)(+16−5 )(1.210(4)(13))
Experiments find:fπ = 130.7 ± 0.4 MeV, fK = 159.8 ± 1.5 MeV,fK/fπ = 1.223(12).
Large error in fK from error in Vus
Using our fK/fπ ⇒ Vus = 0.2242+11−310.2219(26)
PDG value = 0.2196(26)
Recent expt. average = 0.2262(23) [KTEV, KLOE,NA48, E. Blucher, CKM2005]
Our error comparable to PDG, with a reduced error,lattice could be best method to determine Vus
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Light Quark Masses
To find quark masses, must extrapolate to the physicalmeson masses
Electromagnetic and isospin-violating effects are important
Experimental masses:mexpt
π0 , mexptπ+ , mexpt
K0 , mexptK+
Masses with EM effects turned off:mQCD
π0 , mQCDπ+ , mQCD
K0 , mQCDK+
Masses with EM effects turned off and mu = md = m̂:mπ̂, m
K̂
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EM & Isospin Violation
m2π̂ ≈ (mQCD
π0 )2 ≈ (mexpt
π0 )2
m2
K̂≈
(mQCD
K0 )2 + (mQCDK+ )2
2
(mQCD
K0 )2 ≈ (mexpt
K0 )2
(mQCDK+ )2 ≈ (mexpt
K+ )2 − (1 + ∆E)(
(mexptπ+ )2 − (mexpt
π0 )2)
∆E = 0 is “Dashen’s theorem.”
Continuum suggests: ∆E ≈ 1.
We use 0 < ∆E < 2
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Fit for m̂,msRed lines are continuum extrapolated full QCD fits with ms
adjusted so that both π̂ and K̂ are fit
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Quark Masses:mu,d,ms
Using a perturbative evaluation of the mass renormalizationconstant allows us to obtain absolute values of quarkmasses.In collaboration with the HPQCD and UKQCD groups, wefind [hep-lat/0405022 = PRD70, 031504(2004)]:
mMSs = 76(0)(3)(7)(0) MeV, 87(0)(4)(4)(0)
mMSu,d = 2.8(0)(1)(3)(0) MeV, 3.2(0)(2)(2)(0)
ms/mu,d = 27.4(1)(4)(0)(1)
where the errors are from statistics, simulation, perturbationtheory, and electromagnetic effects, respectively. Therenormalization scale of the masses is 2 GeV. Values in bluefrom 2-loop perturbation theory by HPQCD. (hep-ph/0511160)
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PDG Comparison
mMSs = 76(0)(3)(7)(0) MeV ,
PDGLat = 105(25) MeV ,
PDGLat(Nf = 2) = 90(7) MeV ,
Continuum 80 MeV ≤ ms ≤ 155 MeV ,
mMSu,d = 2.8(0)(1)(3)(0) MeV ,
PDGLat = 4.2(1.0) MeV ,
Continuum 3.2 ≤ mu,d ≤ 7 MeV ,
ms/mu,d = 27.4(1)(4)(0)(1)
PDG χPT = 25.8
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Next estimate mu by extrapolating in quark mass to K+
mass.Below m̂ only valence mass changes. There is a smallisospin violation because mu = md = m̂.
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Quark Masses:mu,md
mu/md = 0.43(0)(2)(8) ,
where the errors are statistical (rounded down to 0), latticesystematics, and a conservative estimate of the effects ofelectromagnetism, which have not been included in thesimulation.Using instead a phenomenological evaluation of theelectromagnetic effects from Bijnens and Prades [NPB 490, 239
(1997)] ∆E = 0.84 ± 0.25 we would obtain
mu/md = 0.44(0)(1)(2) ,
mMSu = 1.7(0)(1)(2)(2) MeV ,
mMSd = 3.9(0)(1)(4)(2) MeV .
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PDG Comparison II
mu/md = 0.44(0)(1)(2) ,
PDG χPT = 0.56 ,
PDG 0.3 ≤ mu/md ≤ 0.71 ,
mMSu = 1.7(0)(1)(2)(2) MeV ,
PDG Continuum 1.5 MeV ≤ mu ≤ 5 MeV,
mMSd = 3.9(0)(1)(4)(2) MeV .
PDG Continuum 5 MeV ≤ md ≤ 7 MeV,
No previous lattice result for mu or md.
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Nucleon continuum chiral extrapolationhep-lat/0402030 = PRD70, 094505 (2004)
These graphs updated from that publication
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Big Picture
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Heavy quarks
MILC has been doing Clover-light, Clover-heavycalculations for some time using Nf = 2 + 1 ensemblesto study decay constants and form factors
Using same ensembles, now using Asqtad light quarksin collaboration with Fermilab group
This allows better control of chiral extrapolation (D,B)Techniques may be comparable for Ds and Bs
Very active experimental programs at CLEO-c,BaBar, Belle, D0, CDF
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Leptonic Decays
J. Simone et al., [Fermilab/MILC] arXiv:hep-lat/0410030;C. Aubin et al., PRL 95 (2005) 122002 =arXiv:hep-lat/0506030
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FNAL/MILC Results
fDs= 249 ± 3 ± 16 MeV ,
fD+ = 201 ± 3 ± 17 MeV ,
.
Results for B mesons will follow. We were rushing becauseof CLEO-c schedule. Our results were announced justbefore the experiment (hep-ex/0508057).Currently, one Ds and 47±8 D+ decays observed. Latter by
CLEO-cfD+
s= 267 ± 33 MeV
fD+ = 223 ± 17 ± 3 MeV
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Semileptonic Decays
MILC (see slide 2) + FNAL + HPQCD (M. Di Pierro, A. El-Khadra, A.S. Kronfeld,P.B. Mackenzie, D. Menscher, M. Nobes, M. Okamoto, M.B. Oktay, J. Osborn, J. Simone, andH.D. Trottier), [hep-ph/0408306 = PRL94, 011601 (2005)]
M. Okamoto [hep-lat/0412044]
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45
q2/m
Ds*
2
0
0.5
1
1.5
2
2.5
f +(q
2 )/f +
(0)
0
q2
max/m
Ds*
2
experiment [FOCUS, hep-ex/0410037]lattice QCD [Fermilab/MILC, hep-ph/0408306]1σ (statistical)2σ (statistical)
D → Klν
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D → Klν and D → πlν also, B meson decays allowextraction of several CKM matrix elements
|Vcd| = 0.239(10)(24)(20)
|Vcs| = 0.969(39)(94)(24)
|Vub| = 3.48(29)(38)(47) × 10−3
|Vcb| = 3.91(07)(06)(34) × 10−2
|Vus| = 0.2250(14)(20)(12)
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High Temperature QCD
At Izu, I showed how we determined the transitiontemperature.
Recently, we have been calculating the equation ofstate for Nt = 4 and 6.
Use the integral method:
εV = −∂ lnZ
∂(1/T )
∣
∣
∣
∣
V
,p
T=∂ lnZ
∂V
∣
∣
∣
∣
T
≈lnZ
V,
I = ε− 3p = −T
V
d lnZ
d ln a,
where ε is the energy density, p is the pressure and I is theinteraction measure.
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Ia4 = −6dβ
d ln a∆ 〈P 〉 − 12
dβrt
d ln a∆ 〈R〉 − 16
dβch
d ln a∆ 〈C〉
−∑
f
nf
4
[
d(mfa)
d ln a∆
⟨
ψ̄ψ⟩
f+
du0
d ln a∆
⟨
ψ̄dM
du0
ψ
⟩
f
]
,
pa4 =
∫
ln a
ln a0
(−Ia′4)d ln a′
=
∫
ln a
ln a0
{
6dβ
d ln a∆ 〈P 〉 + 12
dβrt
d ln a∆ 〈R〉 + 16
dβch
d ln a∆ 〈C〉
+∑
f
nf
4
[
d(mfa)
d ln a∆
⟨
ψ̄ψ⟩
f+
du0
d ln a∆
⟨
ψ̄dM
du0
ψ
⟩
f
]}
d ln a′
See Proceedings of Science, Lattice 2005, 156.
ILFT 4, Sokendai, 3/11/06 S. Gottlieb – p. 36/41
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Trajectories of Constant Physics
ILFT 4, Sokendai, 3/11/06 S. Gottlieb – p. 37/41
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Interaction Measure
ILFT 4, Sokendai, 3/11/06 S. Gottlieb – p. 38/41
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Pressure
ILFT 4, Sokendai, 3/11/06 S. Gottlieb – p. 39/41
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Future PlansMILC and FNAL/MILC plan to continue increasingprecision on a number of calculations, includingmasses, decay constants and semileptonic form factors.
It is important to increase our precision to keep pacewith upcoming experimental advances.
To further reduce systematic errors, we will generatenew ensembles with a smaller lattice spacing 0.06 fm.
The first 483 × 144 ml = 0.4ms run with a = 0.06 fmshould be completed in the coming year.
We have just started the 483 × 144 ml = 0.2ms run.The run requires > 1 TF-yr of computing. Furtherrefinements require 2–8–50 Tf-yr.We plan to explore the RHMC algorithm.
ILFT 4, Sokendai, 3/11/06 S. Gottlieb – p. 40/41
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We will complete analysis of B meson decays on theavailable ensembles and compare with NRQCD results.
We may undertake a study of EOS with Nt = 8 usingBlueGene/L computers.
Alternative methods, such as overlap, domain wall andtwisted mass, should contribute to reducing systematicuncertainties. We look forward to comparing results.
ILFT 4, Sokendai, 3/11/06 S. Gottlieb – p. 41/41
![Page 44: Update on current status and future plans for MILC and ... · Use SχPT(Aubin & Bernard), i.e. including taste breaking plus NNLO corrections Points plotted after finite volume correction](https://reader034.vdocuments.net/reader034/viewer/2022051914/6005d886618b6a205a4115e3/html5/thumbnails/44.jpg)
We will complete analysis of B meson decays on theavailable ensembles and compare with NRQCD results.
We may undertake a study of EOS with Nt = 8 usingBlueGene/L computers.
Alternative methods, such as overlap, domain wall andtwisted mass, should contribute to reducing systematicuncertainties. We look forward to comparing results.
We look forward to getting together again withcolleagues and friends in such lovely settings to discussexciting developments.
ILFT 4, Sokendai, 3/11/06 S. Gottlieb – p. 41/41
![Page 45: Update on current status and future plans for MILC and ... · Use SχPT(Aubin & Bernard), i.e. including taste breaking plus NNLO corrections Points plotted after finite volume correction](https://reader034.vdocuments.net/reader034/viewer/2022051914/6005d886618b6a205a4115e3/html5/thumbnails/45.jpg)
We will complete analysis of B meson decays on theavailable ensembles and compare with NRQCD results.
We may undertake a study of EOS with Nt = 8 usingBlueGene/L computers.
Alternative methods, such as overlap, domain wall andtwisted mass, should contribute to reducing systematicuncertainties. We look forward to comparing results.
We look forward to getting together again withcolleagues and friends in such lovely settings to discussexciting developments.
Thanks to all the organizers: Sinya, Shoji, Yusuke andsafe journeys home to all!
ILFT 4, Sokendai, 3/11/06 S. Gottlieb – p. 41/41