Tensor mesons in AdS/QCD

被引:76
作者
Katz, Emanuel
Lewandowski, Adam
Schwartz, Matthew D.
机构
[1] Boston Univ, Dept Phys, Boston, MA 02215 USA
[2] USN Acad, Dept Phys, Annapolis, MD 21403 USA
[3] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[4] Lawrence Berkeley Natl Lab, Theoret Phys Grp, Berkeley, CA 94720 USA
来源
PHYSICAL REVIEW D | 2006年 / 74卷 / 08期
关键词
D O I
10.1103/PhysRevD.74.086004
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We explore tensor mesons in AdS/QCD focusing on f(2)(1270), the lightest spin-2 resonance in QCD. We find that the f(2) mass and the partial width Gamma(f(2)->gamma gamma) are in very good agreement with data. In fact, the dimensionless ratio of these two quantities comes out to be within the current experimental bound. The result for this ratio depends only on N-c and N-f, and the quark and glueball content of the operator responsible for the f(2); more importantly, it does not depend on chiral symmetry breaking and so it is both independent of much of the arbitrariness of AdS/QCD and completely out of reach of chiral perturbation theory. For comparison, we also explore f(2)->pi pi, which, because of its sensitivity to the UV corrections, has much more uncertainty. We also calculate the masses of the higher spin resonances on the Regge trajectory of the f(2), and find they compare favorably with experiment.
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页数:11
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