M. Kapichine

article

Determination of electroweak parameters in polarised deep-inelastic scattering at HERA

V. Andreev, A. Baghdasaryan, K. Begzsuren, A. Belousov, more

The European Physical Journal C > 2018 > 78 > 9 > 1-23

The parameters of the electroweak theory are determined in a combined electroweak and QCD analysis using all deep-inelastic $$e^+p$$ e+p and $$e^-p$$ e-p neutral current and charged current scattering cross sections published by the H1 Collaboration, including data with longitudinally polarised lepton beams. Various fits to Standard Model parameters in the on-shell scheme are performed. The mass...

article

Combination and QCD analysis of charm and beauty production cross-section measurements in deep inelastic ep scattering at HERA

H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, more

The European Physical Journal C > 2018 > 78 > 6 > 1-32

Measurements of open charm and beauty production cross sections in deep inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections are obtained in the kinematic range of negative four-momentum transfer squared of the photon $$2.5~\hbox {GeV}^2\le Q^2 \le 2000\, \hbox {GeV}^2$$ 2.5GeV2≤Q2≤2000GeV2 and Bjorken scaling variable $$3 \cdot 10^{-5} \le x_\mathrm{Bj}...

article

Running of the charm-quark mass from HERA deep-inelastic scattering data

A. Gizhko, A. Geiser, S. Moch, I. Abt, more

Physics Letters B > 2017 > 775 > C > 233-238

Combined HERA data on charm production in deep-inelastic scattering have previously been used to determine the charm-quark running mass mc(mc) in the MS‾ renormalisation scheme. Here, the same data are used as a function of the photon virtuality Q2 to evaluate the charm-quark running mass at different scales to one-loop order, in the context of a next-to-leading order QCD analysis. The scale dependence...

article

Determination of the strong coupling constant $${\varvec{{\alpha _\mathrm{s} (m_\mathrm{Z})}}}$$ α s ( m Z ) in next-to-next-to-leading order QCD using H1 jet cross section measurements

V. Andreev, A. Baghdasaryan, K. Begzsuren, A. Belousov, more

The European Physical Journal C > 2017 > 77 > 11 > 1-21

The strong coupling constant $$\alpha _\mathrm{s}$$ α s is determined from inclusive jet and dijet cross sections in neutral-current deep-inelastic ep scattering (DIS) measured at HERA by the H1 collaboration using next-to-next-to-leading order (NNLO) QCD predictions. The dependence of the NNLO predictions and of the resulting value of $$\alpha _\mathrm{s} (m_\mathrm{Z})$$ α s ...

article

Measurement of $${\varvec{D^{*}}}$$ D ∗ production in diffractive deep inelastic scattering at HERA

V. Andreev, A. Baghdasaryan, K. Begzsuren, A. Belousov, more

The European Physical Journal C > 2017 > 77 > 5 > 1-14

Measurements of $$D^{*}(2010)$$ D ∗ ( 2010 ) meson production in diffractive deep inelastic scattering $$(5<Q^{2}<100\,\mathrm{GeV}^{2})$$ ( 5 < Q 2 < 100 GeV 2 ) are presented which are based on HERA data recorded at a centre-of-mass energy $$\sqrt{s} = 319\,\mathrm{GeV}$$ s = 319 GeV with an integrated luminosity of 287 pb $$^{-1}$$...

article

Measurement of jet production cross sections in deep-inelastic ep scattering at HERA

V. Andreev, A. Baghdasaryan, K. Begzsuren, A. Belousov, more

The European Physical Journal C > 2017 > 77 > 4 > 1-41

A precision measurement of jet cross sections in neutral current deep-inelastic scattering for photon virtualities $$5.5<Q^2 <80\,\mathrm {GeV}^2 $$ 5.5 < Q 2 < 80 GeV 2 and inelasticities $$0.2<y<0.6$$ 0.2 < y < 0.6 is presented, using data taken with the H1 detector at HERA, corresponding to an integrated luminosity of $$290\,\mathrm {pb}^{-1}$$...

article

Search for QCD instanton-induced processes at HERA in the high- $$\pmb {Q^2}$$ Q 2 domain

V. Andreev, A. Baghdasaryan, K. Begzsuren, A. Belousov, more

The European Physical Journal C > 2016 > 76 > 7 > 1-13

Signals of QCD instanton-induced processes are searched for in neutral current deep-inelastic scattering at the electron-proton collider HERA in the kinematic region defined by the Bjorken-scaling variable $$x > 10^{-3}$$ x > 10 - 3 , the inelasticity $$0.2< y < 0.7$$ 0.2 < y < 0.7 and the photon virtuality $$150< Q^2 < 15000$$ 150 < Q 2...

article

Exclusive $$\rho ^0$$ ρ 0 meson photoproduction with a leading neutron at HERA

V. Andreev, A. Baghdasaryan, K. Begzsuren, A. Belousov, more

The European Physical Journal C > 2016 > 76 > 1 > 1-21

A first measurement is presented of exclusive photoproduction of $$\rho ^0$$ ρ 0 mesons associated with leading neutrons at HERA. The data were taken with the H1 detector in the years 2006 and 2007 at a centre-of-mass energy of $$\sqrt{s}=319$$ s = 319 GeV and correspond to an integrated luminosity of 1.16 pb $$^{-1}$$ - 1 . The $$\rho ^0$$ ρ 0 mesons...

article

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

The H1 and ZEUS collaborations, H. Abramowicz, I. Abt, L. Adamczyk, more

Journal of High Energy Physics > 2015 > 2015 > 9 > 1-32

Abstract H1 and ZEUS have published single-differential cross sections for inclusive D^∗±-meson production in deep-inelastic ep scattering at HERA from their respective final data sets. These cross sections are combined in the common visible phase-space region of photon virtuality Q²> 5 GeV², electron inelasticity 0.02 < y < 0.7 and the D^∗± meson’s transverse momentum p_T(D^∗) > 1.5 GeV...

article

Diffractive dijet production with a leading proton in ep collisions at HERA

The H1 collaboration, V. Andreev, A. Baghdasaryan, K. Begzsuren, more

Journal of High Energy Physics > 2015 > 2015 > 5 > 1-36

Abstract The cross section of the diffractive process e ⁺ p → e ⁺ Xp is measured at a centre-of-mass energy of 318 GeV, where the system X contains at least two jets and the leading final state proton p is detected in the H1 Very Forward Proton Spectrometer. The measurement is performed in photoproduction with photon virtualities Q ² < 2 GeV² and in deep-inelastic scattering with 4 GeV² < Q...

article

Measurement of dijet production in diffractive deep-inelastic ep scattering at HERA

H1 collaboration, V. Andreev, A. Baghdasaryan, K. Begzsuren, more

Journal of High Energy Physics > 2015 > 2015 > 3 > 1-35

Abstract A measurement is presented of single- and double-differential dijet cross sections in diffractive deep-inelastic ep scattering at HERA using data collected by the H1 experiment corresponding to an integrated luminosity of 290 pb ⁻¹ . The investigated phase space is spanned by the photon virtuality in the range of 4 < Q ² < 100...

article

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

H. Abramowicz, I. Abt, L. Adamczyk, M. Adamus, more

The European Physical Journal C > 2015 > 75 > 12 > 1-98

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 $$e^{\pm }p$$ e ± 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...

article

Measurement of multijet production in $${e\!\!\;p}$$ e p collisions at high $$\varvec{Q^2}$$ Q 2 and determination of the strong coupling $$\varvec{{\alpha _s}} $$ α s

H1 Collaboration, V. Andreev, A. Baghdasaryan, K. Begzsuren, more

The European Physical Journal C > 2015 > 75 > 2 > 1-48

Inclusive jet, dijet and trijet differential cross sections are measured in neutral current deep-inelastic scattering for exchanged boson virtualities $$150 < Q^2 < 15\,000\,{\mathrm {GeV}^2}$$ 150 < Q 2 < 15 000 GeV 2 using the H1 detector at HERA. The data were taken in the years 2003 to 2007 and correspond to an integrated luminosity of $$351~\mathrm {pb}^{-1}$$...

article

Erratum to: Determination of the integrated luminosity at HERA using elastic QED compton events

The H1 Collaboration, F. D. Aaron, C. Alexa, V. Andreev, more

The European Physical Journal C > 2014 > 74 > 2 > 1-3

article

Measurement of Feynman- $$x$$ x spectra of photons and neutrons in the very forward direction in deep-inelastic scattering at HERA

H1 Collaboration, V. Andreev, A. Baghdasaryan, K. Begzsuren, more

The European Physical Journal C > 2014 > 74 > 6 > 1-17

Measurements of normalised cross sections for the production of photons and neutrons at very small angles with respect to the proton beam direction in deep-inelastic $$ep$$ e p scattering at HERA are presented as a function of the Feynman variable $$x_F$$ x F and of the centre-of-mass energy of the virtual photon-proton system $$W$$ W . The data are taken with the H1...

article

Measurement of inclusive $$\varvec{ep}$$ e p cross sections at high $${\varvec{Q}^{2}}$$ Q 2 at $$\varvec{\sqrt{s}}=225$$ s = 225 and 252 GeV and of the longitudinal proton structure function $${\varvec{F}_{\varvec{L}}}$$ F L at HERA

H1 Collaboration, V. Andreev, A. Baghdasaryan, S. Baghdasaryan, more

The European Physical Journal C > 2014 > 74 > 4 > 1-26

Inclusive $$ep$$ e p double differential cross sections for neutral current deep inelastic scattering are measured with the H1 detector at HERA. The data were taken with a lepton beam energy of $$27.6$$ 27.6 GeV and two proton beam energies of $$E_p=460$$ E p = 460 and 575 GeV corresponding to centre-of-mass energies of 225 and 252 GeV, respectively. The measurements...

article

Measurement of charged particle spectra in deep-inelastic ep scattering at HERA

The H1 Collaboration, C. Alexa, V. Andreev, A. Baghdasaryan, more

The European Physical Journal C > 2013 > 73 > 4 > 1-17

Charged particle production in deep-inelastic ep scattering is measured with the H1 detector at HERA. The kinematic range of the analysis covers low photon virtualities, 5<Q ²<100 GeV², and small values of Bjorken-x, 10⁻⁴<x<10⁻². The analysis is performed in the hadronic centre-of-mass system. The charged particle densities are measured as a function of pseudorapidity (η ^∗) and transverse...

article

Combination and QCD analysis of charm production cross section measurements in deep-inelastic ep scattering at HERA

The H1 and ZEUS Collaborations, H. Abramowicz, I. Abt, L. Adamczyk, more

The European Physical Journal C > 2013 > 73 > 2 > 1-26

Measurements of open charm production cross sections in deep-inelastic ep scattering at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections $\sigma_{\rm red}^{c\bar{c}}$ for charm production are obtained in the kinematic range of photon virtuality 2.5≤Q ²≤2000 GeV² and Bjorken scaling variable 3⋅10⁻⁵≤x≤5⋅10⁻². The combination method accounts for the correlations of the...

article

Elastic and proton-dissociative photoproduction of J/ψ mesons at HERA

The H1 Collaboration, C. Alexa, V. Andreev, A. Baghdasaryan, more

The European Physical Journal C > 2013 > 73 > 6 > 1-17

Cross sections for elastic and proton-dissociative photoproduction of J/ψ mesons are measured with the H1 detector in positron-proton collisions at HERA. The data were collected at ep centre-of-mass energies $\sqrt{s}\approx318~\mathrm{GeV}$ and $\sqrt {s}\approx225 \ \mbox{GeV}$ , corresponding to integrated luminosities of $\mathcal{L} = 130~\mbox{pb}^{-1}$ and $\mathcal{L} = 10.8~\mbox{pb}^{-1}$ ...

article

Determination of the integrated luminosity at HERA using elastic QED Compton events

The H1 Collaboration, F. D. Aaron, C. Alexa, V. Andreev, more

The European Physical Journal C > 2012 > 72 > 10 > 1-13

A measurement of the integrated luminosity at the ep collider HERA is presented, exploiting the elastic QED Compton process ep→eγp. The electron and the photon are detected in the backward calorimeter of the H1 experiment. The integrated luminosity of the data recorded in 2003 to 2007 is determined with a precision of 2.3 %. The measurement is found to be compatible with the corresponding result obtained...

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Search results for: M. Kapichine

Determination of electroweak parameters in polarised deep-inelastic scattering at HERA

Combination and QCD analysis of charm and beauty production cross-section measurements in deep inelastic ep scattering at HERA

Running of the charm-quark mass from HERA deep-inelastic scattering data

Determination of the strong coupling constant $${\varvec{{\alpha _\mathrm{s} (m_\mathrm{Z})}}}$$ α s ( m Z ) in next-to-next-to-leading order QCD using H1 jet cross section measurements

Measurement of $${\varvec{D^{*}}}$$ D ∗ production in diffractive deep inelastic scattering at HERA

Measurement of jet production cross sections in deep-inelastic ep scattering at HERA

Search for QCD instanton-induced processes at HERA in the high- $$\pmb {Q^2}$$ Q 2 domain

Exclusive $$\rho ^0$$ ρ 0 meson photoproduction with a leading neutron at HERA

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

Diffractive dijet production with a leading proton in ep collisions at HERA

Measurement of dijet production in diffractive deep-inelastic ep scattering at HERA

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

Measurement of multijet production in $${e\!\!\;p}$$ e p collisions at high $$\varvec{Q^2}$$ Q 2 and determination of the strong coupling $$\varvec{{\alpha _s}} $$ α s

Erratum to: Determination of the integrated luminosity at HERA using elastic QED compton events

Measurement of Feynman- $$x$$ x spectra of photons and neutrons in the very forward direction in deep-inelastic scattering at HERA

Measurement of inclusive $$\varvec{ep}$$ e p cross sections at high $${\varvec{Q}^{2}}$$ Q 2 at $$\varvec{\sqrt{s}}=225$$ s = 225 and 252 GeV and of the longitudinal proton structure function $${\varvec{F}_{\varvec{L}}}$$ F L at HERA

Measurement of charged particle spectra in deep-inelastic ep scattering at HERA

Combination and QCD analysis of charm production cross section measurements in deep-inelastic ep scattering at HERA

Elastic and proton-dissociative photoproduction of J/ψ mesons at HERA

Determination of the integrated luminosity at HERA using elastic QED Compton events

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