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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.
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>).
Bose-Einstein correlations of charged and neutral kaons 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 Pub. Co 2007 Physics letters. Section B Vol.652 No.1
Bose-Einstein correlations of charged and neutral kaons have been measured in e<SUP>+</SUP>/-p deep inelastic scattering with an integrated luminosity of 121 pb<SUP>-1</SUP> using the ZEUS detector at HERA. The two-particle correlation function was studied as a function of the four-momentum difference of the kaon pairs, Q<SUB>12</SUB>=-(p<SUB>1</SUB>-p<SUB>2</SUB>)<SUP>2</SUP>, assuming a Gaussian shape for the particle source. The values of the radius of the production volume, r, and of the correlation strength, λ, were obtained for both neutral and charged kaons. The radii for charged and neutral kaons are similar and are consistent with those obtained at LEP.
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.