Measurement of the $$\psi(2S)$$ Production Cross Section and Polarization at $$p\bar{p}$$ Collisions at $$\sqrt{s}$$ = 1.8-TeV
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
We present a measurement of the polarization of $$\psi$$(2S) mesons produced in $$p\bar{p}$$ collisions at $$\sqrt{s}$$ = 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 $$p\bar{p}$$ 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 $$\psi(2S) \to \mu^+\mu^-$$ in a 110 $$pb^{-1}$$ data sample of $$p\bar{p}$$ collisions. The polarization of prompt $$\psi$$(2S) is extracted to be -0.54 ± 0.48( stat.) ± 0.04(syst.) for 9 < $$P_T(\psi$$(2S)) < 20 GeV/c.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1369301
- Report Number(s):
- FERMILAB-THESIS-2001-50; 580551
- Country of Publication:
- United States
- Language:
- English
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