1,400 research outputs found
Analysis of dijet events in diffractive interactions with tagged leading proton at the H1 Experiment
No full textTitle: Analysis of dijet events in diffractive ep interactions with tagged leading proton at the H1 experiment Author: Richard Polifka Department: Institute of Particle and Nuclear Physics Supervisor: RNDr. Alice Valkárová, DrSc. Supervisor's e-mail address: [email protected] Abstract: An inclusive dijet production in diffractive deep-inelastic scattering is measured. The diffractive selection is based on tagging of the leading proton in the Forward Proton Spectrometer. The statistics of events obtained during the HERA II running period (integrated luminosity of 156.7 pb−1 ) enables the measurement of jet final states with leading proton for the first time. The data cover the phase space of xIP < 0.1, |t| <= 1.0 GeV2 and 4 <= Q2 <= 110 GeV2 . The dijet data are compared with the next to leading order predictions of the quantum chromodynamics (QCD). The phase space of diffractive dijets is in this analysis by factor of 3 in xIP larger than in previous measurements. The QCD predictions based on the DGLAP parton evolution describe the measured data well even in a non-DGLAP enriched phase space where one on the jets goes into the region close to the direction of the outgoing proton. The measured single-differential cross sections are compared to several Monte Carlo models with different treatment of..
Analýza dvoujetových případů v difrakčních ep interakcích s detekovaným protonem na experimentu H1
No full textTitle: Analysis of dijet events in diffractive ep interactions with tagged leading proton at the H1 experiment Author: Richard Polifka Department: Institute of Particle and Nuclear Physics Supervisor: RNDr. Alice Valkárová, DrSc. Supervisor's e-mail address: [email protected] Abstract: An inclusive dijet production in diffractive deep-inelastic scattering is measured. The diffractive selection is based on tagging of the leading proton in the Forward Proton Spectrometer. The statistics of events obtained during the HERA II running period (integrated luminosity of 156.7 pb−1 ) enables the measurement of jet final states with leading proton for the first time. The data cover the phase space of xIP < 0.1, |t| <= 1.0 GeV2 and 4 <= Q2 <= 110 GeV2 . The dijet data are compared with the next to leading order predictions of the quantum chromodynamics (QCD). The phase space of diffractive dijets is in this analysis by factor of 3 in xIP larger than in previous measurements. The QCD predictions based on the DGLAP parton evolution describe the measured data well even in a non-DGLAP enriched phase space where one on the jets goes into the region close to the direction of the outgoing proton. The measured single-differential cross sections are compared to several Monte Carlo models with different treatment of...Název práce: Analýza dvoujetových případů v difrakčních ep interakcích s detekovaným protonem na experimentu H1 Autor: Richard Polifka Katedra (ústav): Ústav částicové a jaderné fyziky Vedoucí dizertační práce: RNDr. Alice Valkárová, DrSc. e-mail vedoucího: [email protected] Abstrakt: V této práci jsou měřeny inkluzivní dvoujetové koncové stavy v nepružných difrakčních případech s detekovaným rozptýleným protonem. Tento proton je měřen v dopředném detektoru Forward Proton Spectrometer. Vysoká statistika těchto případů v období HERA II s integrovanou celkovou luminositou 156.7 pb−1 umožňuje první měření tohoto druhu za celou dobu provozu experimentu HERA. Data pokrývají kinematickou oblast xIP < 0.1, |t| <= 1.0 GeV2 a 4 <= Q2 <= 110 GeV2 . Naměřená dvoujetová data jsou porovnána s předpovědmi poruchové kvantové chromodynamiky ve druhém řádu rozvoje vazbové konstanty αs. Tyto předpovědi jsou založené na difrakčních partonových distribučních funkcích získaných z předchozích měření inkluzivních difrakčních případů. Fázový prostor pro případy s difrakčními dijety byl rozšířen oproti předchozím měřením třikrát. Případy, kdy jeden z jetů směřuje do přední oblasti detektoru H1 by měly...Ústav částicové a jaderné fyzikyInstitute of Particle and Nuclear PhysicsFaculty of Mathematics and PhysicsMatematicko-fyzikální fakult
The scientific potential and technological challenges of the High-Luminosity Large Hadron Collider program
No full textWe present an overview of the High-Luminosity (HL-LHC) program at the Large Hadron Collider (LHC), its scientific potential and technological challenges for both the accelerator and detectors. The HL-LHC program is expected to start circa 2027 and aims to increase the integrated luminosity delivered by the LHC by an order of magnitude at the collision energy of 14 TeV. This requires upgrades to the injector system, accelerator complex and luminosity levelling. The two experiments, ATLAS and CMS, require substantial upgrades to most of their systems in order to cope with the increased interaction rate, and much higher radiation levels than at the current LHC. We present selected examples based on novel ideas and technologies for applications at a hadron collider. Both experiments will replace their tracking systems. We describe the ATLAS pixel detector upgrade featuring novel tilted modules, and the CMS Outer Tracker upgrade with a new module design enabling use of tracks in the level-1 trigger system. CMS will also install state-of-the-art highly segmented calorimeter endcaps. Finally, we describe new picosecond precision timing detectors of both experiments. In addition, we discuss how the upgrades will enhance the physics performance of the experiments, and solve the computing challenges posed by the expected large data sets. The physics program of the HL-LHC is focused on precision measurements probing the limits of the Standard Model (SM) of particle physics and discovering new physics. We present a selection of studies that have been carried out to motivate the HL-LHC program. A central topic of exploration will be the characterization of the Higgs boson. The large HL-LHC data samples will extend the sensitivity of searches for new particles or new interactions whose existence has been hypothesized in order to explain shortcomings of the SM. Finally, we comment on the nature of large scientific collaborations
sj-docx-1-ine-10.1177_15910199231196451 - Supplemental material for The effect of occlusion location and technique in mechanical thrombectomy for minor stroke
No full textSupplemental material, sj-docx-1-ine-10.1177_15910199231196451 for The effect of occlusion location and technique in mechanical thrombectomy for minor stroke by Isaac Josh Abecassis, Eyad Almallouhi, Reda M. Chalhoub, Ahmed Helal, Janki R. Naidugari, Sami Al Kasab, Eric Bass, Dale Ding, Vasu Saini, Joshua D. Burks, Ilko L. Maier, Pascal Jabbour, Joon-Tae Kim, Stacey Wolfe, Ansaar Rai, Marios-Nikos Psychogios, Edgar Samaniego, Adam S. Arthur, Shinichi Yoshimura, Brian Howard, Ali Alawieh, Isabel Fragata, Hugo Cuellar, Adam Polifka, Justin Mascitelli, Joshua Osbun, Roberto Crosa, Charles Matouk, Min S. Park, Michael R. Levitt, Travis Dumont, Richard W. Williamson, Alejandro M. Spiotta and Robert M. Starke in Interventional Neuroradiology</p
Measurement of Dijet Production in Diffractive Deep-Inelastic Scattering with a Leading Proton at HERA
No full textThe latest results from the H1 experiment on the diffractive dijet production in deep-inelastic scattering are presented. The first jet measurements with a tagged leading protonare described. The results are discussed in terms of diffractive parton densities and Regge factorisation
Study of Exclusive Di-Pion Production in Diffractive ep Interactions
No full textÚstav částicové a jaderné fyzikyInstitute of Particle and Nuclear PhysicsMatematicko-fyzikální fakultaFaculty of Mathematics and Physic
Measurement of the Diffractive Deep-Inelastic Scattering Cross Sections with a Leading Proton at HERA
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