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Measurement of the t dependence in exclusive photoproduction of @?(1S) mesons at HERA
ZEUS Collaboration,Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A.N.,Bar North-Holland Pub. Co 2012 Physics letters: B Vol.708 No.1
The exclusive photoproduction reaction γp→@?(1S)p has been studied with the ZEUS detector in ep collisions at HERA using an integrated luminosity of 468 pb<SUP>-1</SUP>. The measurement covers the kinematic range 60<W<220 GeV and Q<SUP>2</SUP><1 GeV<SUP>2</SUP>, where W is the photon-proton centre-of-mass energy and Q<SUP>2</SUP> is the photon virtuality. The exponential slope, b, of the t dependence of the cross section, where t is the squared four-momentum transfer at the proton vertex, has been measured, yielding b=4.3<SUB>-1.3</SUB><SUP>+2.0</SUP>(stat.)<SUB>-0.6</SUB><SUP>+0.5</SUP>(syst.) GeV<SUP>-2</SUP>. This constitutes the first measurement of the t dependence of the γp→@?(1S)p cross section.
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 the energy dependence of the total photon-proton cross section at HERA
ZEUS Collaboration,Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A.N.,Bar North-Holland Pub. Co 2011 Physics letters: B Vol.697 No.3
The energy dependence of the photon-proton total cross section, σ<SUB>tot</SUB><SUP>γ</SUP><SUP>p</SUP>, was determined from e<SUP>+</SUP>p scattering data collected with the ZEUS detector at HERA at three values of the center-of-mass energy, W, of the γp system in the range 194<W<296 GeV. This is the first determination of the W dependence of σ<SUB>tot</SUB><SUP>γ</SUP><SUP>p</SUP> from a single experiment at high W. Parameterizing σ<SUB>tot</SUB><SUP>γ</SUP><SUP>p</SUP>≃W<SUP>2ε</SUP>, ε=0.111+/-0.009(stat.)+/-0.036(syst.) was obtained.
Inclusive-jet photoproduction at HERA and determination of α<sub>s</sub>
ZEUS Collaboration,Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A.N.,Bar North Holland 2012 Nuclear physics, B Vol.864 No.1
Inclusive-jet cross sections have been measured in the reaction ep->e+jet+X for photon virtuality Q<SUP>2</SUP><1 GeV<SUP>2</SUP> and γp centre-of-mass energies in the region 142<W<SUB>γ</SUB><SUB>p</SUB><293 GeV with the ZEUS detector at HERA using an integrated luminosity of 300 pb<SUP>-1</SUP>. Jets were identified using the k<SUB>T</SUB>, anti-k<SUB>T</SUB> or SIScone jet algorithms in the laboratory frame. Single-differential cross sections are presented as functions of the jet transverse energy, E<SUB>T</SUB><SUP>jet</SUP>, and pseudorapidity, η<SUP>jet</SUP>, for jets with E<SUB>T</SUB><SUP>jet</SUP>>17 GeV and -1<η<SUP>jet</SUP><2.5. In addition, measurements of double-differential inclusive-jet cross sections are presented as functions of E<SUB>T</SUB><SUP>jet</SUP> in different regions of η<SUP>jet</SUP>. Next-to-leading-order QCD calculations give a good description of the measurements, except for jets with low E<SUB>T</SUB><SUP>jet</SUP> and high η<SUP>jet</SUP>. The influence of non-perturbative effects not related to hadronisation was studied. Measurements of the ratios of cross sections using different jet algorithms are also presented; the measured ratios are well described by calculations including up to O(α<SUB>s</SUB><SUP>2</SUP>) terms. Values of α<SUB>s</SUB>(M<SUB>Z</SUB>) were extracted from the measurements and the energy-scale dependence of the coupling was determined. The value of α<SUB>s</SUB>(M<SUB>Z</SUB>) extracted from the measurements based on the k<SUB>T</SUB> jet algorithm is α<SUB>s</SUB>(M<SUB>Z</SUB>)=0.1206<SUB>-0.0022</SUB><SUP>+0.0023</SUP>(exp.)<SUB>-0.0035</SUB><SUP>+0.0042</SUP>(th.); the results from the anti-k<SUB>T</SUB> and SIScone algorithms are compatible with this value and have a similar precision.
Measurement of heavy-quark jet photoproduction at HERA
Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A. N.,Barbagli, G.,Bari, G. Springer-Verlag 2011 The European physical journal. C, Particles and fi Vol.71 No.5
Exclusive electroproduction of two pions at HERA
Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Ashery, D.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A. N.,Barbagli, Springer-Verlag 2012 The European physical journal. C, Particles and fi Vol.72 No.1
Scaled momentum distributions for $ K_S^0 $ KS and $ \Lambda /\bar{\Lambda } $ in DIS at HERA
Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A. N.,Barbagli, G.,Bari, G. Springer-Verlag 2012 Journal of high energy physics Vol.2012 No.3
Measurement of inelastic J/ψ and ψ′ photoproduction at HERA
Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Arslan, O.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A. N.,Barbagli, Springer-Verlag 2013 Journal of high energy physics Vol.2013 No.2
Measurement of beauty production in deep inelastic scattering at HERA using decays into electrons
Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Aggarwal, R.,Antonelli, S.,Antonioli, P.,Antonov, A.,Arneodo, M.,Aushev, V.,Aushev, Y.,Bachynska, O.,Bamberger, A.,Barakbaev, A. N.,Barbagli, G.,Bari, G. Springer-Verlag 2011 European Physical Journal C Vol.71 No.2
Combined measurement and QCD analysis of the inclusive e ± p scattering cross sections at HERA
Aaron, F. D.,Abramowicz, H.,Abt, I.,Adamczyk, L.,Adamus, M.,Al-daya Martin, M.,Alexa, C.,Andreev, V.,Antonelli, S.,Antonioli, P.,Antonov, A.,Antunovic, B.,Arneodo, M.,Aushev, V.,Bachynska, O.,Backovic Springer-Verlag 2010 Journal of high energy physics Vol.2010 No.1