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arXiv · hep-ex/0703028

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

A. Abulencia
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Abstract

We measure the ratio of cross section times branching fraction, $R_p \equiv σ_{χ_{c2}} {\cal B}(χ_{c2} \to J/ψγ)/ σ_{χ_{c1}} {\cal B}(χ_{c1} \to J/ψγ)$, in 1.1 fb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s} =$ 1.96 TeV. This measurement covers the kinematic range $p_T(J/ψ)>4.0$ GeV/$c$, $|η(J/ψ)| < 1.0$, and $p_T(γ)>1.0$ 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 $χ_{c1,2}$ hadroproduction.

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A. Abulencia. 2007-03-16. Measurement of $σ_{χ_{c2}} {\cal B}(χ_{c2} \to J/ψγ)/ σ_{χ_{c1}} {\cal B}(χ_{c1} \to J/ψγ)$ in $p\bar{p}$ Collisions at $\sqrt{s} =$ 1.96 TeV. https://doi.org/10.1103/physrevlett.98.232001

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