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

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.55.4098· OSTI ID:477074

Fleming, S ^[1]; Hernandez, O F ^[2]; Maksymyk, I ^[3]; Nadeau, H ^[4]

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1. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
2. Laboratoire de Physique Nucleaire, Universite de Montreal, C.P. 6128, Succersale A, Montreal, H3C 3P8 (CANADA)
3. Theory Group, Department of Physics, Uniersity of Texas, Austin, Texas 78712 (United States)
4. Department of Physics, McGill University, Montreal, H3A 2T8 (CANADA)

We present the nonrelativistic QCD (NRQCD) prediction for the polarization of the J/{psi} promptly produced in b{r_arrow}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 {minus}0.33 to 0.05 whereas the color-singlet model prediction is {minus}0.40{plus_minus}0.04. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: University of Wisconsin
• DOE Contract Number: FG02-95ER40896
• OSTI ID: 477074
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 7 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
B QUARKS
COLOR MODEL
HELICITY
J PSI-3097 MESONS
MATRIX ELEMENTS
OCTET MODEL
PARTICLE PRODUCTION
POLARIZATION
QUANTUM CHROMODYNAMICS
WEAK HADRONIC DECAY