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Charm production and QCD analysis at HERA and LHC

This review is devoted to the study of charm production in ep and pp collisions. The total set of measurements obtained by the two collaborations H1 and ZEUS from HERA and their combination is outlined, as well as complementary data obtained by the LHCb Collaboration at the LHC. After fitting the parton distribution functions the charm-production cross sections are predicted within ...

Prompt neutrino fluxes in the atmosphere with PROSA parton distribution functions

collaboration , O. Zenaiev et al., Impact of heavy- avour production cross sections [10] R. Gauld , J. Rojo , L. Rottoli and J. Talbert , Charm production in the forward region: [11] NNPDF collaboration , R.D ... production in pp collisions at ps = 7 TeV, Nucl . Phys. [42] M. Lisovyi , A. Verbytskyi and O. Zenaiev , Combined analysis of charm-quark fragmentation-fraction measurements , Eur. Phys. J. C 76 ( 2016 ) 397

A critical appraisal and evaluation of modern PDFs

E. Reya 8 N. Sato 1 A. Vogt 7 O. Zenaiev 4 0 II. Institut für Theoretische Physik, Universität Hamburg , Luruper Chaussee 149, 22761 Hamburg , Germany 1 Jefferson Lab , Newport News, VA 23606 , USA

Impact of heavy-flavour production cross sections measured by the LHCb experiment on parton distribution functions at low x

62. M. Beneke , Phys. Rept. 317 , 1 ( 1999 ). arXiv:hep-ph/9807443 . doi:10.1016/S0370-1573(98)00130- 6 63. O. Zenaiev , Charm production and QCD analysis at HERA and LHC. Ph . D. Thesis , Hamburg

Production of exclusive dijets in diffractive deep inelastic scattering at HERA

-Dambietz 5 11 12 D. Szuba 5 11 12 J. Szuba 11 12 22 E. Tassi 11 12 25 T. Tymieniecka 11 12 A. Verbytskyi 9 11 12 O. Viazlo 1 11 12 R. Walczak 11 12 13 W. A. T. Wan Abdullah 11 12 24 K. Wichmann 11 12 22 O ... . Zenaiev 11 12 22 B. O. Zhautykov 3 11 12 N. Zhmak 4 11 12 D. S. Zotkin 10 11 12 0 Faculty of General Education, Meiji Gakuin University , Yokohama , Japan 1 Department of Nuclear Physics, National Taras

Combination of measurements of inclusive deep inelastic \({e^{\pm }p}\) scattering cross sections and QCD analysis of HERA data

A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current \(e^{\pm }p\) scattering for zero beam polarisation. The data were taken at proton beam energies of 920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity ...

Combination of differential D∗± cross-section measurements in deep-inelastic ep scattering at HERA

collaboration, L. Adamczyk et al., Measurement of the Luminosity in the ZEUS [58] U. Schneekloth , The HERA luminosity upgrade , DESY-HERA-98-05 ( 1998 ) [INSPIRE]. [60] O. Zenaiev , Charm Production and QCD

Measurement of D ∗ photoproduction at three different centre-of-mass energies at HERA

The photoproduction of D ∗± mesons has been measured with the ZEUS detector at HERA at three different ep centre-of-mass energies, \( \sqrt{s} \), of 318, 251 and 225 GeV. For each data set, D ∗± mesons were required to have transverse momentum, p T D ∗ , and pseudo-rapidity, η D∗, in the ranges 1.9 < p T D ∗ < 20 GeV and |η D∗| < 1.6. The events were required to have a virtuality ...

Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass

The production of beauty and charm quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared 5 < Q 2 < 1000 GeV2 using an integrated luminosity of 354 pb−1. The beauty and charm content in events with at least one jet have been extracted using the invariant mass of charged tracks associated with secondary vertices and the ...

Measurement of beauty and charm production in deep inelastic scattering at HERA and measurement of the beauty-quark mass

The production of beauty and charm quarks in ep interactions has been studied with the ZEUS detector at HERA for exchanged four-momentum squared 5 2 1000 GeV2 using an integrated luminosity of 354 pb−1. The beauty and charm content in events with at least one jet have been extracted using the invariant mass of charged tracks associated with secondary vertices and the decay-length ...

Further studies of the photoproduction of isolated photons with a jet at HERA

In this extended analysis using the ZEUS detector at HERA, the photoproduction of isolated photons together with a jet is measured for different ranges of the fractional photon energy, x γ meas , contributing to the photon-jet final state. Cross sections are evaluated in the photon transverse-energy and pseudorapidity ranges 6 < E T γ < 15 GeV and −0.7 < η γ < 0.9, and for jet ...

Measurement of charm fragmentation fractions in photoproduction at HERA

The production of D 0, D *+, D +, \( D_s^{+} \) and \( \Lambda_c^{+} \) charm hadrons and their antiparticles in ep scattering at HERA has been studied with the ZEUS detector, using a total integrated luminosity of 372 pb−1. The fractions of charm quarks hadronising into a particular charm hadron were derived. In addition, the ratio of neutral to charged D-meson production rates, ...

Measurement of D ± production in deep inelastic ep scattering with the ZEUS detector at HERA

Charm production in deep inelastic ep scattering was measured with the ZEUS detector using an integrated luminosity of 354 pb−1. Charm quarks were identified by reconstructing D ± mesons in the D ± → K ∓π±π± decay channel. Lifetime information was used to reduce combinatorial background substantially. Differential cross sections were measured in the kinematic region 5 < Q 2 < 1000 ...

Measurement of D*± production in deep inelastic scattering at HERA

The production of D *± mesons in deep inelastic ep scattering has been measured for exchanged photon virtualities 5 < Q 2 < 1000 GeV2, using an integrated luminosity of 363 pb−1 with the ZEUS detector at HERA. Differential cross sections have been measured and compared to next-to-leading-order QCD calculations. The cross-sections are used to extract the charm contribution to the ...

Measurement of inelastic J/ψ and ψ′ photoproduction at HERA

The cross sections for inelastic photoproduction of J/ψ and ψ′ mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb−1 collected in the period 1996–2007. The ψ′ to J/ψ cross section ratio was measured in the range 0.55 1 GeV. Theoretical predictions within the non-relativistic QCD framework including NLO colour-singlet ...

Scaled momentum distributions for \( K_S^0 \) KS and \( \Lambda /\bar{\Lambda } \) in DIS at HERA

Scaled momentum distributions for the strange hadrons \( K_{\text{S}}^0 \) and \( \Lambda /\bar{\Lambda } \) were measured in deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 330 pb−1. The evolution of these distributions with the photon virtuality, Q 2, was studied in the kinematic region 10 < Q 2 < 40000 GeV2 and 0.001 < x < 0.75, ...

Exclusive electroproduction of two pions at HERA

The exclusive electroproduction of two pions in the mass range 0.4M ππ −1. The analysis was carried out in the kinematic range of 2Q 22, 32Wt|2, where Q 2 is the photon virtuality, W is the photon-proton centre-of-mass energy and t is the squared four-momentum transfer at the proton vertex. The two-pion invariant-mass distribution is interpreted in terms of the pion electromagnetic ...

Scaled momentum spectra in deep inelastic scattering at HERA

Charged particle production has been studied in neutral current deep inelastic ep scattering with the ZEUS detector at HERA using an integrated luminosity of 0.44 fb−1. Distributions of scaled momenta in the Breit frame are presented for particles in the current fragmentation region. The evolution of these spectra with the photon virtuality, Q 2, is described in the kinematic ...

Measurement of heavy-quark jet photoproduction at HERA

Photoproduction of beauty and charm quarks in events with at least two jets has been measured with the ZEUS detector at HERA using an integrated luminosity of 133 pb−1. The fractions of jets containing b and c quarks were extracted using the invariant mass of charged tracks associated with secondary vertices and the decay-length significance of these vertices. Differential cross ...