HERA-B
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Measurement of D^0, D^+, D_s^+ and D^{*+} Production in Fixed Target 920 GeV Proton-Nucleus Collisions

The HERA-B collaboration Abt, I. ; Adams, M. ; Agari, M. ; et al.
Eur.Phys.J.C 52 (2007) 531-542, 2007.
Inspire Record 757982 DOI 10.17182/hepdata.57312

The inclusive production cross sections of the charmed mesons D^0, D^+, D_s^+ and D^{*+} have been measured in interactions of 920 GeV protons on C, Ti, and W targets with the HERA-B detector at the HERA storage ring. Differential cross sections as a function of transverse momentum and Feynman's x variable are given for the central rapidity region and for transverse momenta up to $\pT=3.5$ GeV/$c$. The atomic mass number dependence and the leading to non-leading particle production asymmetries are presented as well.

7 data tables
Table 1

Cross sections (micro barns) in the visible range (-0.15<x_F<0.05).

Table 2

Cross sections (micro barns) extrapolated to the total phase space.

Table 3

Cross sections(micro barns) for particles production in the visible range (-0.15<x_F<0.05).

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Search for the Flavor-Changing Neutral Current Decay $D^0 \to \mu^+\mu^-$ with the HERA-B Detector

The HERA-B collaboration Abt, I. ; Adams, M. ; Albrecht, H. ; et al.
Phys.Lett.B 596 (2004) 173-183, 2004.
Inspire Record 650658 DOI 10.17182/hepdata.57496

We report on a search for the flavor-changing neutral current decay $D^0 \to \mu^+\mu^-$ using $50 \times 10^6$ events recorded with a dimuon trigger in interactions of 920 GeV protons with nuclei by the HERA-B experiment. We find no evidence for such decays and set a 90% confidence level upper limit on the branching fraction $Br(D^0 \to \mu^+\mu^-) &lt;2.0 \times 10^{-6}$.

1 data table
Table 1

Upper limit on the branching fraction of D0 --> MU+ MU- in P NUCLEON interaction.