Nature of the X(3872) from QCD

被引：37
|
作者：
Narison, S. [1 ,2 ]
Navarra, F. S. [3 ]
Nielsen, M. [3 ]
机构：
[1] CNRS, IN2P3, Lab Phys Theor & Astroparticules, F-34095 Montpellier 05, France
[2] Univ Montpellier 2, F-34095 Montpellier 05, France
[3] Univ Sao Paulo, Inst Fis, BR-05389970 Sao Paulo, Brazil
来源：
PHYSICAL REVIEW D | 2011年 / 83卷 / 01期
基金：
巴西圣保罗研究基金会;
关键词：
HEAVY-QUARK-MASS; SUM-RULES; GLUON CONDENSATE; QUANTUM CHROMODYNAMICS; SYMMETRY-BREAKING; POWER CORRECTIONS; BARYON MASSES; VERTICAL-BAR; LIGHT; DECAYS;
D O I：
10.1103/PhysRevD.83.016004
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We have studied some possible four-quark and molecule configurations of the X(3872) using double ratios of sum rules, which are more accurate than the usual simple ratios often used in the literature to obtain hadron masses. We found that the different structures ((3) over bar - (3) over bar and (6) over bar - 6 tetraquarks and D - D(*) molecule) lead to the same prediction for the mass (within the accuracy of the method), indicating that the alone prediction of the X mass may not be sufficient to reveal its nature. In doing these analyses, we also find that (within our approximation) the use of the (MS) over bar running (m) over bar (c)(m(c)(2)), rather than the on-shell mass, is more appropriate to obtain the J/psi and X meson masses. Using vertex sum rules to roughly estimate the X(3872) hadronic and radiative widths, we found that the available experimental data does not exclude a lambda - J/psi-like molecule current.
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页数：9
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