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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
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.
High-ETdijet photoproduction at HERA
Chekanov, S.,Derrick, M.,Magill, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M. C. K.,Jechow, M.,Pavel, N.,Yagü,es Molina, A. G.,Antonelli, S.,Antonioli, P.,Bari, G.,Basile, M. American Physical Society 2007 PHYSICAL REVIEW D - Vol.76 No.7
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
Multijet production at low x<sub>Bj</sub> in deep inelastic scattering at HERA
ZEUS Collaboration,Chekanov, S.,Derrick, M.,Magill, S.,Musgrave, B.,Nicholass, D.,Repond, J.,Yoshida, R.,Mattingly, M.C.K.,Jechow, M.,Pavel, N.,Yagues Molina, A.G.,Antonelli, S.,Antonioli, P.,Bari, G. North Holland 2007 Nuclear Physics, Section B Vol.786 No.1
Inclusive dijet and trijet production in deep inelastic ep scattering has been measured for 10<Q<SUP>2</SUP><100 GeV<SUP>2</SUP> and low Bjorken x, 10<SUP>-4</SUP><x<SUB>Bj</SUB><10<SUP>-2</SUP>. The data were taken at the HERA ep collider with centre-of-mass energy s=318 GeV using the ZEUS detector and correspond to an integrated luminosity of 82 pb<SUP>-1</SUP>. Jets were identified in the hadronic centre-of-mass (HCM) frame using the k<SUB>T</SUB> cluster algorithm in the longitudinally invariant inclusive mode. Measurements of dijet and trijet differential cross sections are presented as functions of Q<SUP>2</SUP>, x<SUB>Bj</SUB>, jet transverse energy, and jet pseudorapidity. As a further examination of low-x<SUB>Bj</SUB> dynamics, multi-differential cross sections as functions of the jet correlations in transverse momenta, azimuthal angles, and pseudorapidity are also presented. Calculations at O(α<SUB>s</SUB><SUP>3</SUP>) generally describe the trijet data well and improve the description of the dijet data compared to the calculation at O(α<SUB>s</SUB><SUP>2</SUP>).
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
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 the longitudinal proton structure function at HERA
ZEUS Collaboration,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.,Cind North-Holland Pub. Co 2009 Physics letters: B Vol.682 No.1
The reduced cross sections for ep deep inelastic scattering have been measured with the ZEUS detector at HERA at three different centre-of-mass energies, 318, 251 and 225 GeV. From the cross sections, measured double differentially in Bjorken x and the virtuality, Q<SUP>2</SUP>, the proton structure functions F<SUB>L</SUB> and F<SUB>2</SUB> have been extracted in the region 5x10<SUP>-4</SUP><x<0.007 and 20<Q<SUP>2</SUP><130 GeV<SUP>2</SUP>.