Double Parton Scattering In Pbar P Interactions At Sqrts PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Double Parton Scattering In Pbar P Interactions At Sqrts PDF full book. Access full book title Double Parton Scattering In Pbar P Interactions At Sqrts.
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2016 |
Genre | : |
ISBN | : |
Download Double Parton Scattering in $p\bar P$ Interactions at $\sqrt{s} Book in PDF, ePub and Kindle
We present the observation of doubly produced $J / \psi$ mesons as an example of processes containing a substantial fraction of double parton scattering. Measurements of the production cross sections for singly and doubly-produced $J/\psi$ mesons were done with the D0 detector at Fermilab in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.96 TeV with an integrated luminosity of 8.1 fb$^{-1}$. For the first time, the double $J / \psi$ production cross section is separated into two parts: contributions from both single and double parton scattering. Lastly, this separation allowed us to determine the effective cross section [sigma]eff, a parameter related to the parton spatial density inside the hadron.
Author | : |
Publisher | : |
Total Pages | : |
Release | : 2016 |
Genre | : |
ISBN | : |
Download Study of Double Parton Interactions in Diphoton + Dijet Events in $p\bar{p}$ Collisions at $\sqrt{s} Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 15 |
Release | : 2009 |
Genre | : |
ISBN | : |
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 | : |
Publisher | : |
Total Pages | : 45 |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Study of Double Parton Scattering Using W + 2-jet Events in Proton-proton Collisions at $\sqrt{s}$ Book in PDF, ePub and Kindle
Double parton scattering is investigated in proton-proton collisions at √s = 7 TeV where the final state includes a W boson, which decays into a muon and a neutrino, and two jets. The data sample corresponds to an integrated luminosity of 5 fb-1, collected with the CMS detector at the LHC. Observables sensitive to double parton scattering are investigated after being corrected for detector effects and selection efficiencies. The fraction of W + 2-jet events due to double parton scattering is measured to be 0.055 +/- 0.002 (stat.) +/- 0.014 (syst.). Finally, the effective cross section, [sigma]eff, characterizing the effective transverse area of hard partonic interactions in collisions between protons is measured to be 20.7 +/- 0.8 (stat.) +/- 6.6 (syst.) mb.
Author | : T. Åkesson |
Publisher | : |
Total Pages | : 12 |
Release | : 1987 |
Genre | : |
ISBN | : |
Download Double Parton Scattering in Pp Collisions at Sqrt(s) Book in PDF, ePub and Kindle
Author | : Alessio Del Fabbro |
Publisher | : |
Total Pages | : 129 |
Release | : 2002 |
Genre | : |
ISBN | : |
Download Double Parton Scattering in High Energy Hadronic Interactions Book in PDF, ePub and Kindle
Author | : Jonathan Gaunt |
Publisher | : |
Total Pages | : |
Release | : 2012 |
Genre | : |
ISBN | : |
Download Double Parton Scattering in Proton-proton Collisions Book in PDF, ePub and Kindle
Double hard parton-parton interactions are expected to occur frequently in proton-proton (p-p) collisions at the LHC. They can give rise to significant backgrounds to certain rare single scattering (SPS) signals, and are an interesting signal process in their own right. In this thesis, we discuss the theoretical description of the double parton scattering (DPS) cross section in the context of Quantum ChromoDynamics (QCD). After an overview of QCD and an introduction to DPS in Chapter 1, we describe in Chapter 2 a framework for calculating the p-p DPS cross section introduced by Snigirev et al., in which this cross section is expressed in terms of double PDFs D_p {ij}(x_1,x_2,Q_A 2,Q_B 2) (dPDFs). We show that the equal-scale dPDFs are subject to momentum and number sum rule constraints, and use these in the construction of an explicit set of leading order (LO) equal-scale dPDFs (the 'GS09' dPDFs). The leptonic same-sign WW DPS signal obtained using GS09 dPDFs is compared with that obtained using simple factorised forms, and the prospects of observing this signal taking into account SPS backgrounds are analysed. We discuss two ways in which the dPDF framework for describing p-p DPS is deficient in Chapter 3. We discuss interference and correlated parton effects in flavour, spin, colour, and parton type, which are ignored by the dPDF framework. We then study DPS-type graphs in which the parton pairs from both protons have arisen from a perturbative 1->2 branching, derive an expression for the part of such graphs associated with the particles arising from the 1->2 branchings being almost on-shell, and use this to demonstrate that the treatment of these graphs by the the dPDF framework is unsatisfactory. In Chapter 4, we study DPS-type graphs in which the parton pair from only one proton has arisen from a perturbative 1->2 branching. We discover that such graphs contribute to the LO p-p DPS cross section, and that crosstalk between partons in the 'nonperturbatively generated' pair is allowed provided that it occurs at a lower scale than that of the perturbative 1->2 branching in the other proton. The result of this analysis is combined with that of the previous chapter to propose a formula for the LO total DPS cross section, and our proposal is compared with those from other authors. We finish in Chapter 5 with some conclusions and suggestions for further work.
Author | : |
Publisher | : |
Total Pages | : 548 |
Release | : 1978 |
Genre | : Power resources |
ISBN | : |
Download Energy Research Abstracts Book in PDF, ePub and Kindle
Author | : AFS. Collaboration |
Publisher | : |
Total Pages | : |
Release | : 1987 |
Genre | : |
ISBN | : |
Download Gluon Bremsstrahlung and Double Parton Scattering in Pp Collisions at Sqrt(s) Book in PDF, ePub and Kindle
Author | : Roel Aaij |
Publisher | : |
Total Pages | : |
Release | : 2020 |
Genre | : |
ISBN | : |
Download Observation of Enhanced Double Parton Scattering in Proton-lead Collisions at $\sqrts_\mathrm{NN}} Book in PDF, ePub and Kindle