I. Atanassov
A5012932268- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Railway Systems and Energy Efficiency
- Railway Engineering and Dynamics
- Transport and Economic Policies
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Transportation Planning and Optimization
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Advanced Data Storage Technologies
- Electrical Contact Performance and Analysis
- CCD and CMOS Imaging Sensors
- Algorithms and Data Compression
- Urban and Freight Transport Logistics
- Radiation Effects in Electronics
- Electromagnetic Simulation and Numerical Methods
- Gamma-ray bursts and supernovae
Institute for Nuclear Research and Nuclear Energy
2013-2024
Bulgarian Academy of Sciences
2014-2024
Institute of High Energy Physics
2023
A. Alikhanyan National Laboratory
2023
University of West Bohemia
2019
University of Illinois Urbana-Champaign
2014-2018
European Organization for Nuclear Research
2009-2015
Campbell Collaboration
2011
University of Cagliari
2003
TOTEM has measured the differential cross-section for elastic proton-proton scattering at LHC energy of {\srud}s = 7TeV analysing data from a short run with dedicated large {\beta} * optics. A single exponential fit slope B (20:1{\pm}0:2stat {\pm}0:3syst)GeV-2 describes range four-momentum transfer squared |t| 0.02 to 0.33 GeV2. After extrapolation 0, total (24:8{\pm}0:2stat {\pm}1:2syst) mb was obtained. Applying optical theorem and using luminosity measurement CMS, (98:3{\pm}0:2stat...
The TOTEM collaboration has measured the proton-proton total cross section at √s=8 TeV using a luminosity-independent method. In LHC fills with dedicated beam optics, Roman pots have been inserted very close to allowing detection of ~90% nuclear elastic scattering events. Simultaneously inelastic rate by T1 and T2 telescopes. By applying optical theorem, (101.7±2.9) mb determined, well in agreement extrapolation from lower energies. This method also allows one derive sections:...
The TOTEM experiment has made a precise measurement of the elastic proton-proton differential cross-section at centre-of-mass energy sqrt(s) = 8 TeV based on high-statistics data sample obtained with beta* 90 optics. Both statistical and systematic uncertainties remain below 1%, except for t-independent contribution from overall normalisation. This unprecedented precision allows to exclude purely exponential in range four-momentum transfer squared 0.027 < |t| 0.2 GeV^2 significance greater...
Proton-proton elastic scattering has been measured by the TOTEM experiment at CERN Large Hadron Collider in dedicated runs with Roman Pot detectors placed as close seven times transverse beam size (σbeam) from outgoing beams. After careful study of accelerator optics and detector alignment, |t|, square four-momentum transferred process, determined an uncertainty . In this letter, first results differential cross-section are presented covering a |t|-range 0.36 to 2.5 GeV2. The range < |t|...
The TOTEM collaboration has measured the proton–proton total cross section at $$\sqrt{s}=13~\hbox {TeV}$$ with a luminosity-independent method. Using dedicated $$\beta ^{*}=90~\hbox {m}$$ beam optics, Roman Pots were inserted very close to beam. inelastic scattering rate been by T1 and T2 telescopes during same LHC fill. After applying optical theorem is $$\sigma _\mathrm{tot}=(110.6~\pm ~3.4$$ ) mb, well in agreement extrapolation from lower energies. This method also allows one derive...
Abstract The TOTEM experiment at the LHC has performed first measurement $$\sqrt{s} = 13\,\mathrm{TeV}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn><mml:mspace /><mml:mi>TeV</mml:mi></mml:mrow></mml:math> of $$\rho $$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>ρ</mml:mi></mml:math> parameter, real to imaginary ratio nuclear elastic scattering amplitude $$t=0$$...
We describe an analysis comparing the $p\overline{p}$ elastic cross section as measured by D0 Collaboration at a center-of-mass energy of 1.96 TeV to that in $pp$ collisions TOTEM 2.76, 7, 8, and 13 using model-independent approach. The sections, extrapolated $\sqrt{s}=1.96\text{ }\text{ }\mathrm{TeV}$, are compared with measurement region diffractive minimum second maximum section. two data sets disagree $3.4\ensuremath{\sigma}$ level thus provide evidence for $t$-channel exchange...
The TOTEM collaboration has measured the proton-proton total cross section at $\sqrt{s}=13$ TeV with a luminosity-independent method. Using dedicated $β^{*}=90$ m beam optics, Roman Pots were inserted very close to beam. inelastic scattering rate been by T1 and T2 telescopes during same LHC fill. After applying optical theorem is $σ_{\rm tot}=(110.6 \pm 3.4$) mb, well in agreement extrapolation from lower energies. This method also allows one derive elastic sections: el} = (31.0 1.7)$ mb...
Abstract The proton–proton elastic differential cross section $${\mathrm{d}}\sigma /{\mathrm{d}}t$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>d</mml:mi><mml:mi>σ</mml:mi><mml:mo>/</mml:mo><mml:mi>d</mml:mi><mml:mi>t</mml:mi></mml:mrow></mml:math> has been measured by the TOTEM experiment at $$\sqrt{s}=2.76\hbox { TeV}$$...
The TOTEM experiment at the LHC has performed first measurement $\sqrt{s} = 13$ TeV of $ρ$ parameter, real to imaginary ratio nuclear elastic scattering amplitude $t=0$, obtaining following results: $ρ= 0.09 \pm 0.01$ and 0.10 0.01$, depending on different physics assumptions mathematical modelling. unprecedented precision measurement, combined with total cross-section measurements in an energy range larger than 10 (from 2.76 13 TeV), implied exclusion all models classified published by...
The TOTEM experiment has measured the charged-particle pseudorapidity density dNch/dη in pp collisions at for 5.3<|η|<6.4 events with least one charged particle transverse momentum above 40 MeV/c this range. This extends analogous measurement performed by other LHC experiments to previously unexplored forward η region. refers more than 99% of non-diffractive processes and single double diffractive masses ∼3.4 GeV/c2, corresponding about 95% total inelastic cross-section. been found decrease...
The first double diffractive cross-section measurement in the very forward region has been carried out by TOTEM experiment at LHC with center-of-mass energy of sqrt(s)=7 TeV. By utilizing tracking detectors T1 and T2, which extend up to |eta|=6.5, a clean sample pp events was extracted. From these events, we measured sigma_DD =(116 +- 25) mub for where both systems have 4.7 <|eta|_min < 6.5 .
This paper describes the design and performance of timing detector developed by TOTEM Collaboration for Roman Pots (RPs) to measure Time-Of-Flight (TOF) protons produced in central diffractive interactions at LHC . The measurement TOF allows determination longitudinal position proton interaction vertex its association with one vertices reconstructed CMS detectors. is based on single crystal Chemical Vapor Deposition (scCVD) diamond plates designed about 50 ps time precision. upgrade...
Proton-proton elastic scattering has been measured by the TOTEM experiment at CERN Large Hadron Collider √s = 7 TeV in special runs with Roman Pot detectors placed as close to outgoing beam seven times transverse size. The differential cross-section measurements are reported |t|-range of 0.36 2.5 GeV2. Extending range data low t values from 0.02 0.33 GeV2, and utilizing luminosity CMS, total proton-proton cross section is be (98.3 ±0.2stat ±2.8syst) mb.
The pseudorapidity density of charged particles dN $$_{ ch }$$ /d $$\eta $$ is measured by the TOTEM experiment in proton–proton collisions at $$\sqrt{s} = 8$$ TeV within range $$3.9<\eta <4.7$$ and $$-6.95<\eta <-6.9$$ . Data were collected a low intensity LHC run with occurring distance 11.25 m from nominal interaction point. data sample expected to include 96–97 % inelastic interactions. measurement reported here considers $$p_T>0$$ MeV/c, produced interactions least one particle...
Precise knowledge of the beam optics at LHC is crucial to fulfil physics goals TOTEM experiment, where kinematics scattered protons reconstructed with near-beam telescopes -- so-called Roman Pots (RP). Before being detected, protons' trajectories are influenced by magnetic fields accelerator lattice. Thus precise understanding proton transport key importance for experiment. A novel method evaluation proposed which exploits kinematical distributions elastically observed in RPs. Theoretical...
Abstract The TOTEM collaboration at the CERN LHC has measured differential cross-section of elastic proton–proton scattering $$\sqrt{s} = 8\,\mathrm{TeV}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>8</mml:mn> <mml:mspace /> <mml:mi>TeV</mml:mi> </mml:mrow> </mml:math> in squared four-momentum transfer range $$0.2\,\mathrm{GeV^{2}}< |t| < 1.9\,\mathrm{GeV^{2}}$$ <mml:mn>0.2</mml:mn>...
Distributed power locomotives have facilitated longer heavy-haul freight trains that improve the efficiency of railway operations. In North America, where majority mainlines are single track, potential operational and economic advantages long limited by inadequate length many existing passing sidings (passing loops). To alleviate challenge operating exceed sidings, railways preserve mainline capacity extending sidings. However, industry practitioners rarely optimize extent infrastructure...
Use of distributed-power locomotives in heavy-haul service has allowed for greater efficiencies through operation longer freight trains. In North America, where the majority main-line routes are single track, potential economic and operational advantages offered by long trains constrained inadequate length many existing passing sidings. To implement trains, railroad operators may run a direction or fleet extend sidings enough to facilitate bidirectional This research seeks characterize...
The North American freight railroad network is projected to experience rising transportation demand in the coming decades, leading increased congestion along many rail corridors. Increased interest expanded passenger service on shared corridors will also create additional capacity demand. However, nation’s lines are still predominantly single track with passing sidings, making double installation a vital upgrade measure sustain future volumes. Since increasing through requires significant...
The pseudorapidity density of charged particles dN(ch)/deta is measured by the TOTEM experiment in pp collisions at sqrt(s) = 8 TeV within range 3.9 < eta 4.7 and -6.95 -6.9. Data were collected a low intensity LHC run with occurring distance 11.25 m from nominal interaction point. data sample expected to include 96-97\% inelastic proton-proton interactions. measurement reported here considers p_T > 0 MeV/c, produced interactions least one particle -7 -6 or 3.7 <4.8 . has been found...