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Polarization of $J/\psi$ and $\psi_{2S}$ mesons produced in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96-TeV

The CDF collaboration
Phys.Rev.Lett. 99 (2007) 132001, 2007

Abstract (data abstract)
Fermilab. Measurement of the polarization of J/PSI and PSI(2S) mesons, as a function of their transverse momentum, produced in PBAR P collisions at a centre of mass energy of 1960 GeV. The prompt polarization parameter ALPHA from a fit to the angular distribution of 1 + ALPHA*COS(THETA)**2 is determined.

  • Table 1

    Data from T 1,F 4


    Polarization parameter ALPHA for J/PSI production.

  • Table 2

    Data from T 1,F 4


    Polarization parameter ALPHA for PSI(2S) production.

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