Tait II:
U***D C*ll*b*r*t**n M**t*ng
Liverpool
Liverpool plans
Alan Irving
Tait II - NESC
ACI 30/1/04
1
Lattice people
Liverpool
•Chris Michael
•Alan Irving
•Paul Rakow
•Craig McNeile (RA, UKQCD S/W manager)
•Zbyszek Sroczynski (RA, phys prog)
•Stewart Wright (RA)
•Steve Miller (GS, Y3, ACI)
•Charles Roberts (GS, Y1, PELR)
•Jenny Pickavance (GS, Y1, CM)
Tait II - NESC
ACI 30/1/04
2
Current/near future projects
Liverpool
• Glue and singlet physics
• Asqtad config generation
– CM, CMcN, ACI, SM
– ZS
• Potentials and light hadrons
– ACI, CMcN
• Testing and measurement
strategies
– CMcN
• Heavy light systems
– CM, CMcN
• Chroma/QDP infrastructure
– CMcN, ZS, SM
• Chiral PT and matching
– CM, SVW
• CPS-Chroma-QDP interface
– CMcN, ZS
• Hadron decays
– CM, CMcN
• Asqtad mesons/singlets
– SM
• Nucleon structure
– PELR
§ CPS/Chroma documentation
– ZS
• K decay?
– ACI?
Tait II - NESC
ACI 30/1/04
3
Who needs what from QCDOC ...
Liverpool
Chris Michael
Paul Rakow
•
•
Plans to continue work with
Wilsonesque configs for:
– Exotic gluonic states:
singlets/hybrids
– unstable particles
– OZI
– Heavy/lights, decays
•
Possible twisted mass Wilson
(also CMcN)
Plans to work with valence
overlap fermions
– nucleon structure
•
Interested in dynamical OF when
it comes
– nucleons etc
•
Working with BJ and RH on CWilson QCDSF: TAO/APESE →
SZIN
– (see elsewhere)
– as above
– Chiral PT matching etc
•
Advise on staggered singlet
project
Tait II - NESC
ACI 30/1/04
4
Who needs what from QCDOC ...
Liverpool
Stewart Wright
Craig McNeile
•
•
Singlet project
•
Decays
•
Heavy-light
•
Large Nc with Harvey Meyer
•
Helping everybody out
•
Grid for QCDOC data
•
.... and much more (see later)
Would work with hadron
measurements from any light
quark configs (e.g. Asqtad):
– Light quark hadrons and chiral
PT, masses fπ
– Hadron decays, all-to-all
– Heavy-light, Bs
Tait II - NESC
ACI 30/1/04
5
Glueballs and Singlets on Asqtad configs
Liverpool
V20x64, β=6.81, am=.03
•
See Steve Miller’s talk at
MILC/UKQCD Glasgow meeting
•
Steve has measured scalar
(|p|=0,1,..) glue correlators on all
significant MILC configs at a =
0.125fm and 0.09fm.
•
Gball masses plausible provided
amq not too small (figs)
•
Mixing? Decays?
•
Need scalar (meson) correlators
for full analysis
Tait II - NESC
ACI 30/1/04
Heavy and
light plots
here.
V20x64, β =6.76, am=.007
6
Scalar glueball data (from Craig McNeile and Steve Miller)
Liverpool
Tait II - NESC
ACI 30/1/04
7
Scalars and disconnected contributions
Liverpool
•
•
•
•
•
•
Steve with help from Balint,
Eduardo F, et al has got a
working code in Chroma/QDP
for measuring connected meson
correlator on Asqtad configs
(MILC then QCDOC).
Steve has relevant scalar
operators as well as ‘pions’.
Taste violations
Disconnected correlator code
for taste singlets ‘ready’
Tests on cluster performance
on-going.
Will use generic fitting code by
Craig (XML formatted data)
Tait II - NESC
•
Plan is to get preliminary results
from MILC configs (thesis
material)
•
‘Long’ QCDOC run (see CTHD
talk) for improved stats may be
critical for real physics, especially
if mixing/decay is as complicated
a phenomenon as expected.
•
Pushing new ground here, so any
result is interesting.
•
Along the way, will get eta’ data
(c.f. Verkataraman & Kilcup?)
ACI 30/1/04
8
Potentials and r0, r1
Liverpool
• Use upsilon splitting for ‘gold-plated’ scale setting
• Potential and r0, r1 still useful.
• Existing potential code (CM + ACI hacks) is serial F77
• Current structure is memory hungry: V24X48 uses 1.7Gb
• Rewrite for 403x90?
• Better: use Chroma/QDP for portability, I/O features etc
• SZIN has fuzzed/blocked W-loops → ‘recode’ → Chroma
• For V(r) fits need Zym. Improved glue lattice coulomb (MILC?)
• No hurdles except time (ACI?)
Tait II - NESC
ACI 30/1/04
9
CONCLUSION
Liverpool
Liverpool is gearing up ..
Tait II - NESC
ACI 30/1/04
10