Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 715972.0, MPI für Physik / YB 2016
Measurement of D* photoproduction at three different centre-of-mass energies at HERA
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Audience:Not Specified
Intended Educational Use:No
Abstract / Description:The photoproduction of $D^{*\\pm}$ mesons has been measured with the ZEUS detector at HERA at three different ep centre-of-mass energies, $\\sqrt{s}$, of 318, 251 and 225 GeV. For each data set, $D^*$ mesons were required to have transverse momentum, $p_T^{D^*}$, and pseudorapidity, $\\eta^{D^*}$, in the ranges $1.9 < p_T^{D^*} < 20$ GeV and $|\\eta^{D^*}|<1.6$. The events were required to have a virtuality of the incoming photon, $Q^2$, of less than 1 GeV$^2$. The dependence on $\\sqrt{s}$ was studied by normalising to the high-statistics measurement at $\\sqrt{s} =318$ GeV. This led to the cancellation of a number of systematic effects both in data and theory. Predictions from next-to-leading-order QCD describe the $\\sqrt{s}$ dependence of the data well.
Classification / Thesaurus:ZEUS
Comment of the Author/Creator:17 pages, 7 figures, accepted by JHEP. Updated version includes comments from journal referee
Document Type:Article
Communicated by:MPI für Physik
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