{psi}{sup {prime}} polarization due to color-octet quarkonia production

Journal Article · Wed Oct 01 00:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.56.4412· OSTI ID:542785

Leibovich, A K ^[1]

---

1. Lauritsen Laboratory, California Institute of Technology, Pasadena, California 91125 (United States)

We calculate the polarization of {psi}{sup {prime}} due to gg{r_arrow}Q{bar Q}[{sup 2S+1}L{sub J}{sup (8)}]g{r_arrow}{psi}{sup ({lambda})} color-octet quarkonia production. We find that at low transverse momenta the {psi}{sup {prime}} is unpolarized due to the contributions proportional to the L=S=0 and L=S=1 color-octet matrix elements. As p{sub {perpendicular}} increases, the {psi}{sup {prime}} mesons become 100{percent} polarized, as predicted by fragmentation calculations. Polarization due to lowest-order color-singlet production is also considered, which qualitatively has a similar shape to the color-octet production. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: California Institute of Technology (CalTech), Pasadena, CA (United States)
• DOE Contract Number: FG03-92ER40701
• OSTI ID: 542785
• Journal Information: Physical Review, D, Vol. 56, Issue 7; Other Information: PBD: Oct 1997
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COLOR MODEL
QUARKONIUM
OCTET MODEL
PSI-3685 MESONS
POLARIZATION
QUANTUM CHROMODYNAMICS
PARTICLE PRODUCTION
TRANSVERSE MOMENTUM
MATRIX ELEMENTS
FRAGMENTATION
SHAPE