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A Measurement Of The Underlying Event Distributions In Proton Proton Collisions At Sqrts
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Book Synopsis A Measurement of the Underlying Event Distributions in Proton-Proton Collisions at Sqrt(s) by : Joseph Salvatore Virzi
Download or read book A Measurement of the Underlying Event Distributions in Proton-Proton Collisions at Sqrt(s) written by Joseph Salvatore Virzi and published by . This book was released on 2012 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Underlying Event distributions are studied in events containing at least one charged particle jet produced in proton-proton collisions at sqrt(s) = 7 TeV. Jets are reconstructed from charged particles using the anti-Kt algorithm with radius parameter R = 0.6. The jet with the largest transverse momentum (pT) and.
Book Synopsis Measurement of the Underlying Event Activity Using Charged-particle Jets in Proton-proton Collisions at $\sqrt{s}$ by :
Download or read book Measurement of the Underlying Event Activity Using Charged-particle Jets in Proton-proton Collisions at $\sqrt{s}$ written by and published by . This book was released on 2015 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the underlying event (UE) activity in proton-proton collisions is performed using events with charged-particle jets produced in the central pseudorapidity region).
Book Synopsis First Measurement of Hadronic Event Shapes in Pp Collisions at Sqrt(s) by :
Download or read book First Measurement of Hadronic Event Shapes in Pp Collisions at Sqrt(s) written by and published by . This book was released on 2011 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hadronic event shapes have been measured in proton-proton collisions at sqrt(s)=7 TeV, with a data sample collected with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 3.2 inverse picobarns. Event-shape distributions, corrected for detector response, are compared with five models of QCD multijet production.
Book Synopsis Measurement of Neutral Strange Particle Production in the Underlying Event in Proton-proton Collisions at Sqrt(s) by :
Download or read book Measurement of Neutral Strange Particle Production in the Underlying Event in Proton-proton Collisions at Sqrt(s) written by and published by . This book was released on 2013 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements are presented of the production of primary K(S)0 and Lambda particles in proton-proton collisions at sqrt(s) = 7 TeV in the region transverse to the leading charged-particle jet in each event. The average multiplicity and average scalar transverse momentum sum of K(S)0 and Lambda particles measured at pseudorapidities abs(eta)
Book Synopsis Study of Double Parton Scattering Using Four-Jet Scenarios by : Paolo Gunnellini
Download or read book Study of Double Parton Scattering Using Four-Jet Scenarios written by Paolo Gunnellini and published by Springer. This book was released on 2015-08-24 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses in a very new and elegant way several measurements and the extraction of so-called double parton scattering. The new and elegant way lies in the combination of measurements and a very smart extraction of double parton scattering results, which is easy to apply and overcomes many of the technical difficulties of older methods. Many new phenomena in particle physics can be observed when particles are collided at the highest energies; one of the highlights in recent years was the discovery of the Higgs boson at the Large Hadron Collider at CERN. Understanding the production mechanism of the Higgs boson at the LHC requires detailed knowledge of the physics of proton-proton collisions. When the density of partons in the protons becomes large, there is a non-negligible probability that more than one parton participates in the interaction and the so-called double parton scattering becomes important. In some cases very particular final state signatures can be observed, which can be regarded as an indication of such double partonic scattering and where the different interactions can be separated. Such multiple partonic interactions play an important role when precise predictions from known processes are required.
Book Synopsis Measurement of Event Shapes in Proton-antiproton Collisions at [the Square Root of S] by : Lester A. Pinera
Download or read book Measurement of Event Shapes in Proton-antiproton Collisions at [the Square Root of S] written by Lester A. Pinera and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: This dissertation presents a measurement of event shape variables in proton-antiproton collisions at a center of momentum energy of 1.96 TeV. The observables studied are the transverse thrust and thrust minor, both defined over final state momenta perpendicular to the beam direction. These variables are calculated using unclustered calorimeter energy measured using the CDF-II detector at the Fermi National Accelerator Lab. In addition to differential distributions, we present the evolution of event shape mean values as a function of the leading jet Et. The data is compared to dedicated theoretical predictions (NLO+NLL) and subsequently to PYTHIA Monte Carlo with and without multiple parton interactions. In the presence of an underlying event the observables are found to significantly depart from the predictions of perturbative QCD.
Book Synopsis Measurement of the Transverse Momentum Distribution of Z Bosons in Proton-proton Collisions at Sqrt(s) by : Klemens Müller
Download or read book Measurement of the Transverse Momentum Distribution of Z Bosons in Proton-proton Collisions at Sqrt(s) written by Klemens Müller and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Underlying Event Activity in Proton Proton Collisions at the LHC Using the Leading Tracks by : Mohammed Zakaria
Download or read book Measurement of the Underlying Event Activity in Proton Proton Collisions at the LHC Using the Leading Tracks written by Mohammed Zakaria and published by . This book was released on 2013 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the activity accompanying the hard collision is performed in proton-proton collisions at two center of mass energies of 0.9 TeV and 7 TeV at CMS. The direction of the track with the highest transverse momentum is used to divide the azimuthal plane to three regions: ... Toward ... Away ..., and ... Transverse ... The data are corrected to the hadronic level and compared with two Monte-Carlo Generator tunes. The results are compared with other experiments at the LHC and the Tevatron. These results can be used to add further constrains on the Monte-Carlo generators used to simulate these collisions. It will also enable us to give better predictions for hadronic collisions at the higher energies the LHC is planning to reach in the future.
Book Synopsis A Measurement of the Proton-proton Inelastic Scattering Cross-section at Sqrt(s) by : Lauren Alexandra Tompkins
Download or read book A Measurement of the Proton-proton Inelastic Scattering Cross-section at Sqrt(s) written by Lauren Alexandra Tompkins and published by . This book was released on 2011 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first measurement of the inelastic cross-section for proton-proton collisions at a center of mass energy of 7 TeV using the ATLAS detector at the Large Hadron Collider is presented. From a dataset corresponding to an integrated luminosity of 20 inverse microbarns, events are selected by requiring activity in scintillation counters mounted in the forward region of the ATLAS detector. An inelastic cross-section of 60.1 +/- 2.1 millibarns is measured for the subset of events visible to the scintillation counters. The uncertainty includes the statistical and systematic uncertainty on the measurement. The visible events satisfy [xi]> 5\times 10-6, where [xi]=MX2/s is calculated from the invariant mass, MX, of hadrons selected using the largest rapidity gap in the event. For diffractive events this corresponds to requiring at least one of the dissociation masses to be larger than 15.7~GeV. Using an extrapolation dependent on the model for the differential diffractive mass distribution, an inelastic cross-section of 69.1 +/- 2.4 (exp) +/- 6.9 (extr) millibarns is determined, where (exp) indicates the experimental uncertainties and (extr) indicates the uncertainty due to the extrapolation from the limited [xi]-range to the full inelastic cross-section.
Book Synopsis Measurement of Pseudorapidity Distributions of Charged Particles in Proton-proton Collisions at $\sqrt{s}$ by :
Download or read book Measurement of Pseudorapidity Distributions of Charged Particles in Proton-proton Collisions at $\sqrt{s}$ written by and published by . This book was released on 2014 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pseudorapidity ($\eta $) distributions of charged particles produced in proton-proton collisions at a centre-of-mass energy of 8 $~\text {TeV}$ are measured in the ranges $
Book Synopsis Search for New Physics with Dijet Angular Distributions in Proton-proton Collisions at $\sqrt{s}$ by :
Download or read book Search for New Physics with Dijet Angular Distributions in Proton-proton Collisions at $\sqrt{s}$ written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is presented for extra spatial dimensions, quantum black holes, and quark contact interactions in measurements of dijet angular distributions in proton-proton collisions at sqrt(s) = 13 TeV. The data were collected with the CMS detector at the LHC and correspond to an integrated luminosity of 2.6 inverse femtobarns. The distributions are found to be in agreement with predictions from perturbative quantum chromodynamics that include electroweak corrections. Limits for different contact interaction models are obtained in a benchmark model, valid to next-to-leading order in QCD, in which only left-handed quarks participate, with quark contact interactions excluded up to a scale of 11.5 or 14.7 TeV for destructive or constructive interference, respectively. The production of quantum black holes is excluded for masses below 7.8 or 5.3 TeV, depending on the model. The lower limits for the scales of virtual graviton exchange in the Arkani-Hamed--Dimopoulos--Dvali model of extra spatial dimensions are in the range 7.9-11.2 TeV, and are the most stringent set of limits available.
Book Synopsis Charged-particle Distributions at Low Transverse Momentum in $\sqrt{s} by :
Download or read book Charged-particle Distributions at Low Transverse Momentum in $\sqrt{s} written by and published by . This book was released on 2016 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, measurements of distributions of charged particles produced in proton-proton collisions with a centre-of-mass energy of 13 TeV are presented. The data were recorded by the ATLAS detector at the LHC and correspond to an integrated luminosity of 151 [mu]b-1. The particles are required to have a transverse momentum greater than 100 MeV and an absolute pseudorapidity less than 2.5. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity and the dependence of the mean transverse momentum on multiplicity are measured in events containing at least two charged particles satisfying the above kinematic criteria. The results are corrected for detector effects and compared to the predictions from several Monte Carlo event generators.
Book Synopsis The Underlying Event in Proton-proton Collisions by : Florian Bechtel
Download or read book The Underlying Event in Proton-proton Collisions written by Florian Bechtel and published by . This book was released on 2009 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for New Phenomena in Dijet Angular Distributions Measured with the ATLAS Detector in Proton-Proton Collisions at Sqrt(s) by : Thorsten Dietzsch
Download or read book Search for New Phenomena in Dijet Angular Distributions Measured with the ATLAS Detector in Proton-Proton Collisions at Sqrt(s) written by Thorsten Dietzsch and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Event Shapes in Proton-Antiproton Collisions at Center-of-Mass Energy 1.96 TeV. by :
Download or read book Measurement of Event Shapes in Proton-Antiproton Collisions at Center-of-Mass Energy 1.96 TeV. written by and published by . This book was released on 2011 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of event shape observables in proton-antiproton collisions at √s = 1.96 TeV is presented. The data for this analysis were recorded by the CDF II detector at the Tevatron collider. The variables studied are the transverse thrust and thrust minor, both defined in the plane perpendicular to the beam direction. The observables are measured using energies from unclustered calorimeter cells. In addition to studies of the differential distributions, we present the dependence of event shape mean values on the leading jet transverse energy. Data are compared with pythia Tune A and to resummed parton level predictions that were matched to fixed order results at NLO accuracy (NLO+NLL). Predictions from pythia Tune A agree fairly well with the data. However, the underlying event contributes significantly to these observables, making it difficult to make direct comparisons to the NLO+NLL predictions, which do not account for the underlying event. To overcome this difficulty, we introduce a new observable, a weighted difference of the mean values of the thrust and thrust minor, which is less sensitive to the underlying event, allowing for a comparison with NLO+NLL. Both pythia Tune A and the NLO+NLL calculations agree well within the 20% theoretical uncertainty with the data for this observable, indicating that perturbative QCD successfully describes shapes of the hadronic final states.
Book Synopsis Measurement of the Transverse Momentum and $\phi ^*_{\eta }$ Distributions of Drell-Yan Lepton Pairs in Proton-proton Collisions at $\sqrt{s} by :
Download or read book Measurement of the Transverse Momentum and $\phi ^*_{\eta }$ Distributions of Drell-Yan Lepton Pairs in Proton-proton Collisions at $\sqrt{s} written by and published by . This book was released on 2016 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: Distributions of transverse momentum pTll and the related angular variable $\phi ^*_{\eta }$ of Drell-Yan lepton pairs are measured in 20.3 fb-1 of proton-proton collisions at √s=8 TeV with the ATLAS detector at the LHC. Measurements in electron-pair and muon-pair final states are corrected for detector effects and combined. Compared to previous measurements in proton[Gamma]Çôproton collisions at √s=7 TeV these new measurements benefit from a larger data sample and improved control of systematic uncertainties. Measurements are performed in bins of lepton-pair mass above, around and below the Z -boson mass peak. The data are compared to predictions from perturbative and resummed QCD calculations. For values of $\phi ^*_{\eta }$
Book Synopsis Transverse-momentum and Pseudorapidity Distributions of Charged Hadrons in Pp Collisions at Sqrt(s) by :
Download or read book Transverse-momentum and Pseudorapidity Distributions of Charged Hadrons in Pp Collisions at Sqrt(s) written by and published by . This book was released on 2010 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at √s = 7 TeV are measured with the inner tracking system of the CMS detector at the LHC. The charged-hadron yield is obtained by counting the number of reconstructed hits, hit-pairs, and fully reconstructed charged-particle tracks. The combination of the three methods gives a charged-particle multiplicity per unit of pseudorapidity dN{sub ch}/d[eta].
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