Measurement of $σ_{χ_{c2}} {\cal B}(χ_{c2} \to J/ψ γ)/ σ_{χ_{c1}} {\cal B}(χ_{c1} \to J/ψγ)$ in $p\bar{p}$ Collisions at $\sqrt{s} =$ 1.96 TeV

Details Measurement of $σ_{χ_{c2}} {\cal B}(χ_{c2} \to J/ψ γ)/ σ_{χ_{c1}} {\cal B}(χ_{c1} \to J/ψγ)$ in $p\bar{p}$ Collisions at $\sqrt{s} =$ 1.96 TeV Measurement of $σ_{χ_{c2}} {\cal B}(χ_{c2} \to J/ψ γ)/ σ_{χ_{c1}} {\cal B}(χ_{c1} \to J/ψγ)$ in $p\bar{p}$ Collisions at $\sqrt{s} =$ 1.96 TeV

2007-03-16

arxiv.org/abs/hep-ex/0703028v1

Phys.Rev.Lett.98:232001,2007

Physics

High Energy Physics

High Energy Physics - Experiment

Scientific paper

10.1103/PhysRevLett.98.232001

We measure the ratio of cross section times branching fraction, $R_p \equiv \sigma_{\chi_{c2}} {\cal B}(\chi_{c2} \to J/\psi \gamma)/ \sigma_{\chi_{c1}} {\cal B}(\chi_{c1} \to J/\psi \gamma)$, in 1.1 fb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s} =$ 1.96 TeV. This measurement covers the kinematic range $p_T(J/\psi)>4.0$ GeV/$c$, $|\eta(J/\psi)| < 1.0$, and $p_T(\gamma)>1.0$ GeV/$c$. For events due to prompt processes, we find $R_p = 0.395\pm0.016(stat.)\pm0.015(sys.)$. This result represents a significant improvement in precision over previous measurements of prompt $\chi_{c1,2}$ hadroproduction.

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