NRQCD matrix elements in polarization of J/psi produced from b decay

被引：33

作者：

Fleming, S

Hernandez, OF

Maksymyk, I

Nadeau, H

机构：

[1] UNIV QUEBEC,NUCL PHYS LAB,MONTREAL,PQ H3C 3P8,CANADA

[2] UNIV TEXAS,DEPT PHYS,THEORY GRP,AUSTIN,TX 78712

[3] MCGILL UNIV,DEPT PHYS,MONTREAL,PQ H3A 2T8,CANADA

来源：

PHYSICAL REVIEW D | 1997年 / 55卷 / 07期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevD.55.4098

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the nonrelativistic QCD (NRQCD) prediction for the polarization of the J/psi promptly produced In b-->J/psi+X, as well as the helicity-summed production rate. We propose that these observables can be of avail in measuring the three most important color-octet NRQCD matrix elements involved in J/psi production. Anticipating: the measurement of the polarization parameter alpha, we determine its expected range given current experimental bounds on the color-octet matrix elements. We find that the leading-order NRQCD prediction for the polarization parameter alpha is expected to lie in the range -0.33 to 0.05 whereas the color-singlet model prediction is -0.40 +/- 0.04.

引用

页码：4098 / 4104

页数：7

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