Azimuthal Decorrelations And Multiple Parton Interactions In Photon 2 Jet And Photon 3 Jet Events In Ppbar Collisions At Sqrts PDF Download
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| Release | : 2011 |
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Download Azimuthal Decorrelations and Multiple Parton Interactions in Photon+2 Jet and Photon+3 Jet Events in Ppbar Collisions at Sqrt{s} Book in PDF, ePub and Kindle
Samples of inclusive [gamma] + 2 jet and [gamma] + 3 jet events collected by the D0 experiment with an integrated luminosity of about 1 fb−1 in p{bar p} collisions at √s = 1.96 TeV are used to measure cross sections as a function of the angle in the plane transverse to the beam direction between the transverse momentum (p{sub T}) of the [gamma] + leading jet system (jets are ordered in p{sub T}) and p{sub T} of the other jet for [gamma] + 2 jet, or p{sub T} sum of the two other jets for [gamma] + 3 jet events. The results are compared to different models of multiple parton interactions (MPI) in the pythia and sherpa Monte Carlo (MC) generators. The data indicate a contribution from events with double parton (DP) interactions and are well described by predictions provided by the pythia MPI models with p{sub T}-ordered showers and by sherpa with the default MPI model. The [gamma] + 2 jet data are also used to determine the fraction of events with DP interactions as a function of the azimuthal angle and as a function of the second jet p{sub T}.
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| Total Pages | : 15 |
| Release | : 2009 |
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Download Double Parton Interactions in Photon+3 Jet Events in Ppbar Collisions Sqrt{s} Book in PDF, ePub and Kindle
We have used a sample of photon+3 jets events collected by the D0 experiment with an integrated luminosity of about 1 fb−1 to determine the fraction of events with double parton scattering (f{sub DP}) in a single ppbar collision at √s = 1.96 TeV. The DP fraction and effective cross section (sigma{sub eff}), a process-independent scale parameter related to the parton density inside the nucleon, are measured in three intervals of the second (ordered in p{sub T}) jet transverse momentum pT{sub jet2} within the range 15
| Author | : Klaus Rabbertz |
| Publisher | : Springer |
| Total Pages | : 226 |
| Release | : 2016-10-11 |
| Genre | : Science |
| ISBN | : 3319421158 |
Download Jet Physics at the LHC Book in PDF, ePub and Kindle
This book reviews the latest experimental results on jet physics from proton-proton collisons at the LHC. Jets allow to determine the strong coupling constant over a wide range of energies up the highest ones possible so far, and to constrain the gluon parton distribution of the proton, both of which are important uncertainties on theory predictions in general and for the Higgs boson in particular.A novel approach in this book is to categorize the examined quantities according to the types of absolute, ratio, or shape measurements and to explain in detail the advantages and differences. Including numerous illustrations and tables the physics message and impact of each observable is clearly elaborated.
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| Total Pages | : 4 |
| Release | : 2011 |
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Download Studies of Multi-Parton Interactions in Photon+Jets Events at Book in PDF, ePub and Kindle
We consider sample of inclusive [gamma] + 3 jet events collected by the D0 experiment. The double parton fraction (f{sub DP}) and effective cross section [sigma]{sub eff}, a process-independent scale parameter related to the parton density inside the nucleon, are measured in three intervals of the second (ordered in p{sub T}) jet transverse momentum p{sub T}{sup jet2} within the 15 ≤ p{sub T}{sup jet2} ≤ 30 GeV range. Also we measured cross sections as a function of the angle in the plane transverse to the beam direction between the transverse momentum (p{sub T}) of the [gamma] + leading jet system and p{sub T} of the other jet for [gamma] + 2 jet, or p{sub T} sum of the two other jets for [gamma] + 3 jet events. The results are compared to different models of multiple parton interactions (MPI) in the PYTHIA and SHERPA Monte Carlo (MC) generators.
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| Release | : 2016 |
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Download Multiple Parton Interactions in Ppbar Collisions in D0 Experiment at the Tevatron Collider Book in PDF, ePub and Kindle
The thesis is devoted to the study of processes with multiple parton interactions (MPI) in a ppbar collision collected by D0 detector at the Fermilab Tevatron collider at sqrt(s) = 1.96 TeV. The study includes measurements of MPI event fraction and effective cross section, a process-independent parameter related to the effective interaction region inside the nucleon. The measurements are done using events with a photon and three hadronic jets in the final state. The measured effective cross section is used to estimate background from MPI for WH production at the Tevatron energy.
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| Total Pages | : 4 |
| Release | : 2016 |
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Download Multiple Parton Interaction Studies at DØ Book in PDF, ePub and Kindle
Here, we present the results of studies of multiparton interactions done by the DØ collaboration using the Fermilab Tevatron at a center of mass energy of 1.96 TeV. We also present three analyses, involving three distinct final signatures: (a) a photon with at least 3 jets ([gamma] + 3jets), (b) a photon with a bottom or charm quark tagged jet and at least 2 other jets ([gamma] + b/c + 2jets), and (c) two J/ [psi] mesons. The fraction of photon + jet events initiated by double parton scattering is about 20%, while the fraction for events in which two J/ [psi] mesons were produced is 30 ± 10. While the two measurements are statistically compatible, the difference might indicate differences in the quark and gluon distribution within a nucleon. Finally, this speculation originates from the fact that photon + jet events are created by collisions with quarks in the initial states, while J/ [psi] events are produced preferentially by a gluonic initial state.
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| Release | : 2016 |
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Download Measurement of Dijet Azimuthal Decorrelation in Pp Collisions at $\sqrt{s}$ Book in PDF, ePub and Kindle
A measurement of the decorrelation of azimuthal angles between the two jets with the largest transverse momenta is presented for seven regions of leading jet transverse momentum up to 2.2 TeV. The analysis is based on the proton-proton collision data collected with the CMS experiment at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 fb$^{-1}$. The dijet azimuthal decorrelation is caused by the radiation of additional jets and probes the dynamics of multijet production. The results are compared to fixed-order predictions of perturbative quantum chromodynamics (QCD), and to simulations using Monte Carlo event generators that include parton showers, hadronization, and multiparton interactions. Event generators with only two outgoing high transverse momentum partons fail to describe the measurement, even when supplemented with next-to-leading-order QCD corrections and parton showers. Much better agreement is achieved when at least three outgoing partons are complemented through either next-to-leading-order predictions or parton showers. This observation emphasizes the need to improve predictions for multijet production.
| Author | : You-Hao Chang |
| Publisher | : Springer |
| Total Pages | : 107 |
| Release | : 2017-01-20 |
| Genre | : Science |
| ISBN | : 9811038244 |
Download Study of Double Parton Scattering in Photon + 3 Jets Final State Book in PDF, ePub and Kindle
This book mainly focuses on the study of photon + 3 jets final state in Proton-Proton Collisions at √s = 7TeV, searching for patterns of two (or more) distinct hard scatterings in the same collision, i.e the so-called Double Parton Scattering (DPS). A new method by using Monte Carlo generators was performed and provides higher order corrections to the description of the Single Parton Scattering (SPS) background. Further it is investigated whether additional contributions from DPS can improve the agreement between the measured data and the Monte Carlo predictions. The current theoretical uncertainties related to the SPS background are found to be larger than expectation. At the same time a rich set of DPS-sensitive measurements is reported for possible further interpretation.
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| Total Pages | : 172 |
| Release | : 1993 |
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Download Properties of Events Containing a Photon and Several Jets Seen in P{bar P} Collisions at (square Root)s Book in PDF, ePub and Kindle
The CDF detector is used to investigate the properties of events containing a photon and two jets. The rate of photon +2 jet production is higher than the theoretical calculation, but the shape of the events agrees with QCD predictions.
| Author | : Paul Douglas Sheldon |
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| Total Pages | : 182 |
| Release | : 1986 |
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Download Comparison of Three-jet and Radiative Two-jet Events in Electron-positron Annihilation at 29 GeV Book in PDF, ePub and Kindle
