We present recent lattice results on the baryon spectrum, nucleon electromagnetic and axial form factors, nucleon to △ transition form factors as well as the △ electromagnetic form factors. The masses of the low lying baryons and the nucleon form factors are calculated using two degenerate flavors of twisted mass fermions down to pion mass of about 270 MeV. We compare to the results of other collaborations. The nucleon to △ transition and △ form factors are calculated in a hybrid scheme, which uses staggered sea quarks and domain wall valence quarks. The dominant magnetic dipole nucleon to △ transition form factor is also evaluated using dynamical domain wall fermions. The transverse density distributions of the △ in the infinite momentum frame are extracted using the form factors determined from lattice QCD.
参考文献
[1] | Frezzotti R;Grassi P A;Sint S;Weisz P .[J].Journal of High Energy Physics,2001,0108:058. |
[2] | Frezzotti R;Rossi G C .[J].Journal of High Energy Physics,2004,0408:007. |
[3] | Alexandrou C et al.[J].Physical Review D,2008,78:014509. |
[4] | Alexandrou C et al.[J].PoS,2007,LAT2007:087. |
[5] | Frezzotti R;Rossi G .[J].PoS,2007,LAT2007:277. |
[6] | Shindler, A .Twisted mass lattice QCD[J].Physics Reports,2008(2/3):37-110. |
[7] | Gockeler M et al.[J].PoS,2007,LAT2007:041. |
[8] | Aoki S et al.[J].Physical Review D,2009,79:034503. |
[9] | Durr S et al.[J].Science,2008,322:1224. |
[10] | Del Debbio L;Ginsti L;Luscher M,R;Petronzio R,Tantalo N .[J].Journal of High Energy Physics,2007,0702:056. |
[11] | Aoki Y,et al.arXiv:0903.4155[Z]. |
[12] | Aubin C et al.[J].Physical Review D,2004,70:094505. |
[13] | Hagler Ph et al.[J].Physical Review D,2008,77:094502. |
[14] | Alexandrou C et al.[J].Nuclear Physics A,2009,825:115. |
[15] | Boyle P .[J].PoS,2007,LAT2007:005. |
[16] | Allton C et al.[J].Physical Review D,2008,78:114509. |
[17] | Aoki S et al.[J].Physical Review D,2008,78:014508. |
[18] | Jansen K.arXiv:0810.5634[Z]. |
[19] | Alexandrou C;Koutsou G;Negele J W;Tsapalis A .[J].Physical Review D,2006,74:034508. |
[20] | Drach V et al.[J].PoS,2008,LAT2008:123. |
[21] | Alexandrou C,et al. in preparation[Z]. |
[22] | Walker-Loud A et al.[J].Physical Review D,2009,79:054502. |
[23] | Michael C .[J].Nuclear Physics B,1985,259:58. |
[24] | Liischer M;Wolff U .[J].Nuclear Physics B,1990,339:222. |
[25] | Basak S et al.[J].Physical Review D,2007,76:074504. |
[26] | Lasscock B G et al.[J].Physical Review D,2007,76:054510. |
[27] | Gattringer C et al.[J].Physical Review D,2008,78:034501. |
[28] | Morningstar C arXiv:0810 4448[Z]. |
[29] | Lepage P et al.[J].Nuclear Physics(Proc Suppl),2002,106:12. |
[30] | Morningstar C .[J].Nucl Phys A Proc,2002,109(Suppl):185. |
[31] | Draper T,et al. arXiv:0810 5512[Z]. |
[32] | Alexandrou C;Stiliaxis E;Papanicolas C N .[J].PoS,2008,LAT2008 |
[33] | Alexandrou C,et al. (ETMC).arXiv:0811.0724[Z]. |
[34] | Kelly J J .[J].Physical Review C:Nuclear Physics,2004,70:068202. |
[35] | Bratt J D et al.[J].PoS,2008,LAT2008:141. |
[36] | Ohta S,Yamazaki T.(RBC-UKQCD collaborations).arXiv:0810.0045[Z]. |
[37] | Hemmert T R;Weise W .[J].European physical Journal A,2002,15:487. |
[38] | Gockeler M et al.[J].Physical Review D,2005,71:034508. |
[39] | Yamazaki T,et al.arXiv:0904.2039[Z]. |
[40] | Alexandrou C;Koutsou G;Leontiou T;Negele J W Tsapalis A .[J].Physical Review D,2007,76:094511. |
[41] | Yamazaki T et al.[J].Physical Review Letters,2008,100:171602. |
[42] | Hemmert T R;Procura M;Weise W .[J].Physical Review D,2003,68:075009. |
[43] | Alexandrou C et al.[J].Physical Review D,2008,77:085012. |
[44] | Pascalutsa V;Vanderhaeghen M .[J].Physical Review Letters,2005,95:232001. |
[45] | Alexandrou C et al.[J].Physical Review D,2009,79:014507. |
[46] | Burkardt M .[J].Physical Review D,2000,62:071503. |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%