Abstract
Charm production in charged current deep inelastic scattering has been measured for the first time in e±p collisions, using data collected with the ZEUS detector at HERA, corresponding to an integrated luminosity of 358 pb−1. Results are presented separately for e+p and e−p scattering at a centre-of-mass energy of sqrt{s} = 318 GeV within a kinematic phase-space region of 200 GeV2 < Q2 < 60000 GeV2 and y < 0.9, where Q2 is the squared four-momentum transfer and y is the inelasticity. The measured cross sections of electroweak charm production are consistent with expectations from the Standard Model within the large statistical uncertainties.
Highlights
Charm production in charged current deep inelastic scattering has been measured for the first time in e±p collisions, using data collected with the ZEUS detector at HERA, corresponding to an integrated luminosity of 358 pb−1
This paper presents measurements of charm production in CC DIS in e±p collisions using data from the HERA II data-taking period
The charm-jet cross sections in CC DIS in e±p collisions were measured in the visible kinematic phase space of 200 GeV2 < Q2 < 60000 GeV2, y < 0.9, ETjet > 5 GeV and −2.5 < ηjet < 2.0 to be σc+,vis =
Summary
The kinematics of lepton-proton scattering can be described in terms of the Lorentzinvariant variables xBj, y and Q2. In the zero-mass variable-flavour-number scheme (ZM-VFNS) [14, 15], the charm part of the structure functions F2c and xF3c can be expressed in terms of different PDFs as follows. In the NLO fixed-flavour-number (FFN) scheme [16, 17], charm-mass effects are treated explicitly up to O(αs) in the matrix elements. In this scheme, there is no charm-quark content in the proton, the charm QPM graph in figure 1 (ii) and its associated higherorder corrections do not occur. The ZM-VFNS prediction was evaluated with the ATLAS-epW Z16 PDF sets [6]
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