Diffractive open charm production at HERA

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dc.creatorLevin, E. M.
dc.creatorMartin, A. D.
dc.creatorRyskin, M. G.
dc.creatorTeubner, T.
dc.date1996-06-26
dc.date.accessioned2026-07-07T03:59:29Z
dc.date.available2026-07-07T03:59:29Z
dc.descriptionWe use perturbative QCD to calculate the cross sections $σ^{L,T}$ for the diffractive production of open charm $(c\overline{c})$ from longitudinally and transversely polarised photons (of virtuality $Q^2$) incident at high energy $(\sqrt{s})$ on a proton target. We study both the $Q^2$ and $M^2$ dependence of the cross sections, where $M$ is the invariant mass of the $c\overline{c}$ pair. Surprisingly, the result for $σ^T$, as well as for $σ^L$, is perturbatively stable. We estimate higher-order corrections and find a sizeable enhancement of the cross sections. The cross sections depend on the {\it square} of the gluon density $g (x, K^2)$, and we show that the observation of open charm at the HERA electron-proton collider can act as a sensitive probe of the gluon distribution for $x = (Q^2 + M^2)/s$ and scale $K^2 = (m_c^2 + \langle k_T^2 \rangle) (1 + Q^2/M^2)$ where the average quark transverse momentum squared $\langle k_T^2 \rangle \sim m_c^2$. As compared to diffractive $J/ψ$ production, open charm has the advantage that it is independent of the non-perturbative ambiguities arising from the $J/ψ$ wave function. We estimate the fraction of diffractive events that arise from $c\overline{c}$ production.
dc.description34 pages, LaTeX, 15 Postscript figures included using epsf. The complete paper, including figures, is also available via anonymous ftp at ftp://cpt1.dur.ac.uk/pub/preprints/dtp96/dtp9650/
dc.identifierhttps://arxiv.org/abs/hep-ph/9606443
dc.identifierhttp://arxiv.org/abs/hep-ph/9606443
dc.identifierZ.Phys. C74 (1997) 671-685
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/46247
dc.subjectHigh Energy Physics - Phenomenology
dc.titleDiffractive open charm production at HERA
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