Measurement of F2($c \bar{c}$) and F2($b \bar{b}$) at high $Q^{2}$ using the H1 vertex detector at HERA

Measurements are presented of inclusive charm and beauty cross sections in e^+p collisions at HERA for values of photon virtuality Q^2 > 150 GeV^2 and of inelasticity 0.1 < y < 0.7. The charm and beauty fractions are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the H1 vertex detector. The data are divided into four regions in Q^2 and Bjorken x, and values for the structure functions F_2^{c\bar{c}} and F_2^{b\bar{b}} are obtained. The results are found to be compatible with the predictions of perturbative quantum chromodynamics.

Note:

25 pages, 9 figures and 2 tables Report-no: DESY 04-209

positron p: colliding beams
positron p: inclusive reaction
quark: pair production
differential cross section: momentum transfer
p: structure function
structure function: charm
structure function: bottom
x-dependence
quantum chromodynamics: perturbation theory
track data analysis: impact parameter

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Measurement of F2(ccˉc \bar{c}ccˉ) and F2(bbˉb \bar{b}bbˉ) at high Q2Q^{2}Q2 using the H1 vertex detector at HERA

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Measurement of F2( $c \bar{c}$ ) and F2( $b \bar{b}$ ) at high $Q^{2}$ using the H1 vertex detector at HERA