Static hybrid quarkonium potential with improved staggered quarks Page: 3 of 3
This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided to UNT Digital Library by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
3
8
'IT'I'I
H
U63 I-
4
2
0-2
AL
0 quenched
- dynamical1 fm
I,, I.2 fm
I I .0 1 2 3 4
5
r/ro
Figure 3. The u potential for quenched (oc-
tagons) and 2+1 flavor (diamonds) QCD, in units
of ro. The potentials are plotted relative to the
zero determined in the fit to the ground state po-
tentials.
ferent shapes, namely, the Coulomb attraction is
slightly stronger in the light quark ensemble and
the string tension is slightly weaker in units of ro,
confirming earlier findings [1]. A softening of the
Coulomb well is also evident. This is an expected
consequence of HYP smoothing.
Similarly in Fig. 2 we show light quark effects
in the E' excitation potential. The potentials are
plotted relative to the zero determined in the fit
to the ground state potentials. From Fig. 2 we
see that the excited state potential E' is slightly
steeper than that of quenched QCD.
In Fig. 3 we plot the f; potential. This hybrid
potential is weakly repulsive at short range, as
would be expected from the Coulomb interaction
in a color octet quark-antiquark system. This ef-
fect is softened by HYP smoothing. At the level
of our statistical errors there are no apparent dif-
ferences at long range, but better statistics would
certainly be of interest.4. CONCLUSIONS
Our measurements at a = 0.09 fm confirm the
shape changes in the ground-state potential, seen
previously at a = 0.13 fm. In units of ro we
find, further, that adding 2 + 1 flavors of dynam-
ical quarks makes the E+' excited state potential
slightly steeper and the H; slightly more repul-
sive at short range. We find no clear evidence for
a flattening of the potentials that would signal
string breaking.
Computations were performed at LANL,
NERSC, NCSA, ORNL, PSC, SDSC, FNAL, and
the CHPC (Utah). This work is supported by the
U.S. NSF and DOE.
REFERENCES
1. C. Bernard et al., Phys. Rev. D 62 (2000)
034503 and D. Toussaint, this conference
(2002).
2. G. S. Bali et al. [TXL Collaboration], Phys.
Rev. D 62 (2000) 054503. C. Allton [UKQCD
Collaboration], Nucl. Phys. Proc. Supply. 109
(2002) 3.
3. B. Bolder et al., Phys. Rev. D 63 (2001)
074504.
4. K. J. Juge, J. Kuti and C. J. Morningstar,
Phys. Rev. Lett. 82 (1999) 4400. and Nuc.
Phys. Proc. Supply. 83 (2000) 304.
5. C. Bernard et al., Phys. Rev. D 64 (2001)
074509. I. T. Drummond and R. R. Horgan,
Phys. Lett. B 447 (1999) 298.
6. K. Orginos and D. Toussaint, Phys. Rev. D
59 (1999) 014501; K. Orginos, D. Toussaint
and R. L. Sugar, Phys. Rev. D 60 (1999)
054503; G. P. Lepage, Phys. Rev. D 59 (1999)
074502.
7. A. Hasenfratz and F. Knechtli, Phys. Rev. D
64 (2001) 034504.
8. A. Hasenfratz, R. Hoffmann and F. Knechtli,
Nucl. Phys. Proc. Suppl. 106 (2002) 418.
9. L. A. Griffiths, C. Michael and P. E. Rakow,
Phys. Lett. B 129 (1983) 351.0
' ' ' ' ' ' ' ' ' ' ' .
-2
Search Inside
This article can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Article.
Bernard, C. Static hybrid quarkonium potential with improved staggered quarks, article, January 6, 2004; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc735048/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.