A. Buniatyan
A5054048855- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Radiation Detection and Scintillator Technologies
- Electron and X-Ray Spectroscopy Techniques
- Dark Matter and Cosmic Phenomena
- Computational Physics and Python Applications
- Historical Astronomy and Related Studies
University of Birmingham
2015-2023
Heidelberg University
2013-2014
Deutsches Elektronen-Synchrotron DESY
2013
Max Planck Institute for Nuclear Physics
2001
A. Alikhanyan National Laboratory
2001
The physics programme and the design are described of a new collider for particle nuclear physics, Large Hadron Electron Collider (LHeC), in which newly built electron beam 60 GeV, up to possibly 140 energy collides with intense hadron beams LHC. Compared HERA, kinematic range covered is extended by factor twenty negative four-momentum squared, $Q^2$, inverse Bjorken $x$, while luminosity $10^{33}$ cm$^{-2}$s$^{-1}$ LHeC projected exceed integrated HERA two orders magnitude. devoted an...
A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral charged current $$e^{\pm }p$$ scattering zero beam polarisation. The data were taken proton energies 920, 820, 575 460 GeV an electron energy 27.5 GeV. correspond to integrated luminosity about 1 fb $$^{-1}$$ span six orders magnitude in negative four-momentum-transfer squared, $$Q^2$$ , Bjorken x. correlations systematic uncertainties evaluated...
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 ep centre-of-mass energies $\sqrt{s}\approx318~\mathrm{GeV}$ $\sqrt {s}\approx225 \ \mbox{GeV}$ , corresponding to integrated luminosities $\mathcal{L} = 130~\mbox{pb}^{-1}$ 10.8~\mbox{pb}^{-1}$ respectively. cross as a function photon-proton energy range 25<W γp <110 GeV. Differential dσ/dt, where t is squared...
The first measurement of lepton-jet momentum imbalance and azimuthal correlation in lepton-proton scattering at high transfer is presented. These data, taken with the H1 detector HERA, are corrected for effects using an unbinned machine learning algorithm (multifold), which considers eight observables simultaneously this application. unfolded cross sections compared calculations performed within context collinear or transverse-momentum-dependent factorization quantum chromodynamics as well...
Measurements of open charm and beauty production cross sections in deep inelastic ep scattering at HERA from the H1 ZEUS Collaborations are combined. Reduced obtained kinematic range negative four-momentum transfer squared photon $$2.5~\hbox {GeV}^2\le Q^2 \le 2000\, \hbox {GeV}^2$$ Bjorken scaling variable $$3 \cdot 10^{-5} x_\mathrm{Bj} 5 10^{-2}$$ . The combination method accounts for correlations statistical systematic uncertainties among different datasets. Perturbative QCD calculations...
Inclusive jet, dijet and trijet differential cross sections are measured in neutral current deep-inelastic scattering for exchanged boson virtualities $$150 < Q^2 15\,000\,{\mathrm {GeV}^2}$$ using the H1 detector at HERA. The data were taken years 2003 to 2007 correspond an integrated luminosity of $$351~\mathrm {pb}^{-1}$$ . Double Jet obtained a regularised unfolding procedure. They presented as function $$Q^2$$ transverse momentum $$P_\mathrm{T}^\mathrm{jet}$$ , proton's longitudinal...
Abstract A precision measurement of jet cross sections in neutral current deep-inelastic scattering for photon virtualities $$5.5<Q^2 <80\,\mathrm {GeV}^2 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>5.5</mml:mn><mml:mo><</mml:mo><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo><</mml:mo><mml:mn>80</mml:mn><mml:mspace /><mml:msup><mml:mrow><mml:mi>GeV</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msup></mml:mrow></mml:math> and...
The strong coupling constant αs 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. dependence of NNLO predictions resulting value αs(mZ) Z-boson mass mZ are studied as a function choice renormalisation factorisation scales. Using data together, to be αs(mZ)=0.1157(20)exp(29)th . Complementary, together with parton distribution...
Abstract The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in 2015. final stage is presented, a next-to-next-to-leading-order (NNLO) analysis the HERA data on inclusive deep inelastic ep scattering together with jet as published by H1 and ZEUS collaborations. A perturbative QCD fit, simultaneously $$\alpha _s(M_Z^2)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msub> <mml:mi>α</mml:mi> <mml:mi>s</mml:mi> </mml:msub>...
The cross section of the diffractive process e + p → Xp is measured at a centre-of-mass energy 318 GeV, where system X contains least two jets and leading final state proton detected in H1 Very Forward Proton Spectrometer. measurement performed photoproduction with photon virtualities Q 2 < GeV2 deep-inelastic scattering 4 80 GeV2. results are compared to next- to-leading order QCD calculations based on parton distribution functions as extracted from measurements inclusive sections scattering.
The radiation pattern within high energy quark- and gluon-initiated jets (jet substructure) is used extensively as a precision probe of the strong force well an environment for optimizing event generators with numerous applications in particle nuclear physics. Looking at electron-proton collisions particular interest many complications present hadron colliders are absent. A detailed study modern jet substructure observables, angularities, presented using data recorded H1 detector HERA....
Abstract Exclusive photoproduction of $${{\rho ^0}} (770)$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mi>ρ</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>(</mml:mo> <mml:mn>770</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> </mml:math> mesons is studied using the H1 detector at ep collider HERA. A sample about 900,000 events used to measure single- and double-differential cross sections for reaction $$\gamma p \rightarrow \pi ^{+}\pi ^{-}Y$$...
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 290 pb−1. The investigated phase space spanned photon virtuality range 4 < Q 2 100 GeV2 fractional proton longitudinal momentum loss x ℙ 0.03. resulting are compared with next-to-leading order QCD predictions based on parton distribution functions value strong coupling...
The H1 Collaboration reports the first measurement of 1-jettiness event shape observable $\tau_1^b$ in neutral-current deep-inelastic electron-proton scattering (DIS). is equivalent to a thrust defined Breit frame. data sample was collected at HERA $ep$ collider years 2003-2007 with center-of-mass energy $\sqrt{s}=319\,\text{GeV}$, corresponding an integrated luminosity $351.1\,\text{pb}^{-1}$. Triple differential cross sections are provided as function $\tau_1^b$, virtuality $Q^2$, and...
The H1 Collaboration at HERA reports the first measurement of groomed event shape observables in deep inelastic electron-proton scattering (DIS) $\sqrt{s}=319$ GeV, using data recorded between years 2003 and 2007 with an integrated luminosity $351$ pb$^{-1}$. Event shapes provide incisive probes perturbative non-perturbative QCD. Grooming techniques have been used for jet measurements hadronic collisions; this paper presents application grooming to DIS data. analysis is carried out Breit...
Combined HERA data on charm production in deep-inelastic scattering have previously been used to determine the charm-quark running mass $m_c(m_c)$ MSbar renormalisation scheme. Here, same are as a function of photon virtuality $Q^2$ evaluate at different scales one-loop order, context next-to-leading order QCD analysis. The scale dependence is found be consistent with expectations.
Measurements of normalised cross sections for the production photons and neutrons at very small angles with respect to proton beam direction in deep-inelastic $$ep$$ scattering HERA are presented as a function Feynman variable $$x_F$$ centre-of-mass energy virtual photon-proton system $$W$$ . The data taken H1 detector years 2006 2007 correspond an integrated luminosity $$131~\text {pb}^{-1}$$ measurement is restricted pseudorapidity range $$\eta >7.9$$ covers negative four momentum transfer...
A first measurement is presented of exclusive photoproduction $$\rho ^0$$ mesons associated with leading neutrons at HERA. The data were taken the H1 detector in years 2006 and 2007 a centre-of-mass energy $$\sqrt{s}=319$$ GeV correspond to an integrated luminosity 1.16 pb $$^{-1}$$ . transverse momenta $$p_T<1$$ are reconstructed from their decays charged pions, while carrying large fraction incoming proton momentum, $$x_L>0.35$$ , detected Forward Neutron Calorimeter. phase space defined...
The parameters of the electroweak theory are determined in a combined and QCD analysis using all deep-inelastic $$e^+p$$ $$e^-p$$ neutral current charged scattering cross sections published by H1 Collaboration, including data with longitudinally polarised lepton beams. Various fits to Standard Model on-shell scheme performed. mass W boson is as $$m_W=80.520\pm 0.115~\mathrm {GeV} $$ . axial-vector vector couplings light quarks Z also determined. Both results improve precision previous...
The Mu3e experiment searches for charged lepton flavor violation in the rare decay μ→eee with a projected sensitivity of 10−16. A precise measurement product momenta, vertex and time is necessary background suppression at rates 109 muons/s. This can be achieved by combining an ultra-lightweight pixel tracker based on HV-MAPS two timing systems. trigger-less readout detector three stages FPGA-boards over multi GBit/s optical links into GPU filter farm presented. In this scheme data from all...
Signals of QCD instanton-induced processes are searched for in neutral current deep-inelastic scattering at the electron-proton collider HERA kinematic region defined by Bjorken-scaling variable $$x > 10^{-3}$$ , inelasticity $$0.2< y < 0.7$$ and photon virtuality $$150< Q^2 15000$$ GeV $$^2$$ . The search is performed using H1 data corresponding to an integrated luminosity 351 pb $$^{-1}$$ No evidence production events observed. Upper limits on cross section between 1.5 6 pb, $$95\,\,\%$$...
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 are combined the common visible phase-space region of photon virtuality Q 2 > 5 GeV2, electron inelasticity 0.02 < y 0.7 ∗± meson's transverse momentum p T(D ∗) 1.5 GeV pseudorapidity |η(D ∗)| 1.5. The combination procedure takes into account all correlations, yielding significantly reduced experimental...