Measurement of the $γ {+ D}^{* \pm}$ Cross Section in $\bar{p} p$ Collisions at $\sqrt s = 1.8 TeV$

Publisher Website

16 December 1996

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 77 (25) , 5005-5010
https://doi.org/10.1103/physrevlett.77.5005

Abstract

We have measured the cross section of

γ {+ D}^{* \pm}

production in

\bar{p} p

collisions at

\sqrt{s} = 1.8 TeV

using the Collider Detector at Fermilab. In this kinematic region, the Compton scattering process

(g_{c} \to γ c)

is expected to dominate and thus provide a direct link to the charm quark density in the proton. From the

45 \pm 18

γ {+ D}^{* \pm}

candidates in a

16.4 {pb}^{- 1}

data sample, we have determined the production cross section to be

0.38 \pm 0.15 (stat) \pm 0.11 (syst)

nb for the rapidity range

| y (D^{* \pm}) | < 1.2

and

| y (γ) | < 0.9

, and for the transverse momentum range

p_{T} (D^{* \pm}) > 6 GeV / c

and

16 < p_{T} (γ) < 40 GeV / c

. The measured cross section is compared to a theoretical prediction.

Keywords

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