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Inclusive-jet and dijet cross sections in deep inelastic scattering at HERA
ZEUS Collaboration,Chekanov, S.,Derrick, M.,Magill, S.,Miglioranzi, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M.C.K.,Pavel, N.,Yagues Molina, A.G.,Antonelli, S.,Antonioli, P.,Bar Elsevier BV * North-Holland 2007 Nuclear Physics, Section B Vol.765 No.1-2
Inclusive-jet and dijet differential cross sections have been measured in neutral current deep inelastic ep scattering for exchanged boson virtualities Q<SUP>2</SUP>>125 GeV<SUP>2</SUP> with the ZEUS detector at HERA using an integrated luminosity of 82 pb<SUP>-1</SUP>. Jets were identified in the Breit frame using the k<SUB>T</SUB> cluster algorithm. Jet cross sections are presented as functions of several kinematic and jet variables. The results are also presented in different regions of Q<SUP>2</SUP>. Next-to-leading-order QCD calculations describe the measurements well. Regions of phase space where the theoretical uncertainties are small have been identified. Measurements in these regions have the potential to constrain the gluon density in the proton when used as inputs to global fits of the proton parton distribution functions.
Production of excited charm and charm-strange mesons at HERA
Chekanov, S.,Derrick, M.,Magill, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M. C. K.,Antonioli, P.,Bari, G.,Bellagamba, L.,Boscherini, D.,Bruni, A.,Bruni, G.,Cindolo, F.,Corradi, Springer-Verlag 2009 European Physical Journal C Vol.60 No.1
Measurement of D<sup>*+</sup>/- meson production in e<sup>+</sup>/-p scattering at low Q<sup>2</sup>
ZEUS Collaboration,Chekanov, S.,Derrick, M.,Magill, S.,Miglioranzi, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M.C.K.,Jechow, M.,Pavel, N.,Yagues Molina, A.G.,Antonelli, S.,Antoni North-Holland Pub. Co 2007 Physics letters: B Vol.649 No.2
The production of D<SUP>*+</SUP>/-(2010) mesons in e<SUP>+</SUP>/-p scattering in the range of exchanged photon virtuality 0.05<Q<SUP>2</SUP><0.7 GeV<SUP>2</SUP> has been measured with the ZEUS detector at HERA using an integrated luminosity of 82 pb<SUP>-1</SUP>. The decay channels D<SUP>*+</SUP>->D<SUP>0</SUP>π<SUP>+</SUP> with D<SUP>0</SUP>->K<SUP>-</SUP>π<SUP>+</SUP> and corresponding antiparticle decay were used to identify D<SUP>*</SUP> mesons and the ZEUS beampipe calorimeter was used to identify the scattered electron. Differential D<SUP>*</SUP> cross sections as functions of Q<SUP>2</SUP>, inelasticity, y, transverse momentum of the D<SUP>*</SUP> meson, p<SUB>T</SUB>(D<SUP>*</SUP>), and pseudorapidity of the D<SUP>*</SUP> meson, η(D<SUP>*</SUP>), have been measured in the kinematic region 0.02<y<0.85, 1.5<p<SUB>T</SUB>(D<SUP>*</SUP>)<9.0 GeV and |η(D<SUP>*</SUP>)|<1.5. The measured differential cross sections are in agreement with two different NLO QCD calculations. The cross sections are also compared to previous ZEUS measurements in the photoproduction and DIS regimes.
Measurement of neutral current cross sections at high Bjorken-x with the ZEUS detector at HERA
Chekanov, S.,Derrick, M.,Magill, S.,Miglioranzi, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M.C.K.,Pavel, N.,Molina, A.G.Y.,Antonelli, S.,Antonioli, P.,Bari, G.,Basile, M.,Bellaga Springer-Verlag 2007 European Physical Journal C Vol.49 No.2
Measurement of prompt photons with associated jets in photoproduction at HERA
Chekanov, S.,Derrick, M.,Magill, S.,Miglioranzi, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M.C.K.,Pavel, N.,Yagü,es Molina, A.G.,Antonelli, S.,Antonioli, P.,Bari, G.,Basile, Springer-Verlag 2007 European Physical Journal C Vol.49 No.2
Search for stop production in R-parity-violating supersymmetry at HERA
Chekanov, S.,Derrick, M.,Magill, S.,Miglioranzi, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M.C.K.,Pavel, N.,Molina, A.G.Y.,Antonelli, S.,Antonioli, P.,Bari, G.,Basile, M.,Bellaga Springer-Verlag 2007 European Physical Journal C Vol.50 No.2
Measurement of D ± and D 0 production in deep inelastic scattering using a lifetime tag at HERA
Chekanov, S.,Derrick, M.,Magill, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M. C. K.,Antonioli, P.,Bari, G.,Bellagamba, L.,Boscherini, D.,Bruni, A.,Bruni, G.,Cindolo, F.,Corradi, Springer-Verlag 2009 European Physical Journal C Vol.63 No.2
Measurement of dijet photoproduction for events with a leading neutron at HERA
Chekanov, S.,Derrick, M.,Magill, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R. Elsevier 2010 Nuclear Physics, Section B Vol. No.
<P><B>Abstract</B></P><P>Differential cross sections for dijet photoproduction and this process in association with a leading neutron, <SUP>e+</SUP>+p→<SUP>e+</SUP>+jet+jet+X(+n), have been measured with the ZEUS detector at HERA using an integrated luminosity of 40 pb<SUP>−1</SUP>. The fraction of dijet events with a leading neutron was studied as a function of different jet and event variables. Single- and double-differential cross sections are presented as a function of the longitudinal fraction of the proton momentum carried by the leading neutron, <SUB>xL</SUB>, and of its transverse momentum squared, pT2. The dijet data are compared to inclusive DIS and photoproduction results; they are all consistent with a simple pion-exchange model. The neutron yield as a function of <SUB>xL</SUB> was found to depend only on the fraction of the proton beam energy going into the forward region, independent of the hard process. No firm conclusion can be drawn on the presence of rescattering effects.</P>