Measurement Of The Psi 2s Polarization In Pp Collisions At The Square Root Of S
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Measurement of the [psi](2S) Polarization in Pp̄ Collisions at [the Square Root Of]s
 Polarization in Pp̄ Collisions at [the Square Root Of]s](https://library.ardhindie.com/contents/assets/images/blank.png){kind=small}
We present a measurement of the polarization of [psi](2S) mesons produced in pp̄ collisions at [the square root of]s = 1.8 TeV with the CDF detector at Fermilab. This measurement is a sensitive test of the calculations based on the Non-relativistic QCD (NRQCD) factorization mechanism, which are able to account for the unexpectedly large cross section for charmonium production in pp̄ collisions (roughly a factor 50 above the Color Singlet Model). These calculations also predict that directly produced charmonia should approach 100% transverse polarization for high transverse momentum of the onium state. We consider [psi](2S) mesons, reconstructed using the decay mode [psi](2S) [right arror] [mu]+ [mu]- in a 110 pb-1 data sample of pp̄ collisions. The polarization of prompt [psi](2S) is extracted to be -0.54 +/- 0.48(stat.) +/- 0.04(syst.) for 9