Download or read book Hadroproduction of Massive Lepton Pairs and Tests of QCD Transverse Momentum Distribution Dependence written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Tests of quantum chromodynamics are proposed in the production of massive lepton pairs in hadronic collisions. Predictions are presented for the manner in which the transverse momentum distribution of the pair should change with changes in the mass and longitudinal momentum of the pair, and with changes in the overall energy of the collision. Data are shown to determine the average gluon momentum distribution in the nucleon. Lepton pair production in .pi. N and anti p N processes provides a method to isolate a gluon jet. 20 references.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1979 with total page 1180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spin Dependence of Massive Lepton Pair Production in Proton proton Collisions written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors calculate the transverse momentum distribution for the production of massive lepton-pairs in longitudinally polarized, proton-proton collider energies within the context of perturbative quantum chromodynamics. For values of the transverse momentum Q{sub {Tau}} greater than roughly half the pair mass Q, Q{sub {Tau}}> Q/2, they show that the differential cross section is dominated by subprocesses initiated by incident gluons, provided that the polarized gluon density is not too small. Massive lepton-pair differential cross sections should be a good source of independent constraints on the polarized gluon density, free from the experimental and theoretical complications of photon isolation that beset studies of prompt photon production. They provide predictions for the spin-averaged and spin-dependent differential cross sections as a function of Q{sub {Tau}} at energies relevant for the Relativistic Heavy Ion Collider (RHIC) at Brookhaven, and they compare these with predictions for real prompt photon production.

Download or read book Massive Lepton Pair Production written by and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A report is presented of recent experimental and theoretical progress in studies of the production of massive lepton pairs in hadronic collisions. Among the topics discussed are deviations from scaling, the status of the proofs of factorization in the parton model, higher-order terms in the QCD expansion, the discrepancy between measured and predicted yields (K factor), high-twist terms, soft gluon effects, and transverse momentum distributions.

Download or read book Theoretical Uncertainties in the QCD Predictions for Transverse Momentum Distributions in pi Nucleon Production of Lepton Pairs written by Kevin R. Barger and published by . This book was released on 1992 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Sixteenth Rencontre de Moriond QCD and lepton physics written by J. Thanh Van Tran and published by Atlantica Séguier Frontières. This book was released on 1981 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book INIS Atomindex written by and published by . This book was released on 1980 with total page 1692 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Massive Lepton Pairs as a Prompt Photon Surrogate written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors discuss the transverse momentum distribution for the production of massive lepton-pairs in hadron reactions at fixed target and collider energies within the context of next-to-leading order perturbative quantum chromodynamics. For values of the transverse momentum Q{sub T} greater than the pair mass Q, Q{sub T}> Q, they show that the differential cross section is dominated by subprocesses initiated by incident gluons. Massive lepton-pair differential cross sections are an advantageous source of constraints on the gluon density, free from the experimental and theoretical complications of photon isolation that beset studies of prompt photon production. They compare calculations with data and provide predictions for the differential cross section as a function of Q{sub T} in proton-antiproton reactions at center-of-mass energies of 1.8 TeV, and in proton-nucleon reactions at fixed target and LHC energies.

Download or read book Constraints on the Gluon Density from Lepton Pair Production written by and published by . This book was released on 2000 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hadroproduction of lepton pairs with mass Q and finite transverse momentum Q{sub T} is described in perturbative QCD by the same partonic subprocesses as prompt photon production. The authors demonstrate that, like prompt photon production, lepton pair production is dominated by quark-gluon scattering in the region Q{sub T}> Q/2. This feature leads to sensitivity to the gluon density in kinematical regimes accessible in collider and fixed target experiments, and it provides a new independent method for constraining the gluon density.

Download or read book Low Mass Lepton Pair Production in Hadron Collisions written by and published by . This book was released on 1999 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The hadroproduction of lepton pairs with mass Q and transverse momentum Q{sub T} can be described in perturbative QCD by the same partonic subprocesses as prompt photon production. They demonstrate that, like prompt photon production, lepton pair production is dominated by quark-gluon scattering in the region Q{sub T}> Q/2. This leads to sensitivity to the gluon density in kinematical regimes that are accessible both at collider and fixed target experiments while eliminating the theoretical and experimental uncertainties present in prompt photon production.

Download or read book Lepton Scattering Hadrons And Qcd Procs Of The Workshop written by W Melnitchouk and published by World Scientific. This book was released on 2001-10-19 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is centered on recent developments in the exploration of hadronic structure through lepton scattering, in the description of hadron physics directly from lattice QCD and non-perturbative QCD models, and in efforts to strengthen the links between these activities. Specific topics that are covered include: parton distribution functions, polarized structure functions, generalized structure functions, nuclear effects, quark-hadron duality, electromagnetic form factors, structure functions and hadron properties from lattice QCD, and QCD models based on the Dyson-Schwinger equations.

Download or read book Lepton Pair Production written by J. Thanh Van Tran and published by Atlantica Séguier Frontières. This book was released on 1981 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Annual Rochester Conference on High Energy Nuclear Physics written by and published by . This book was released on 1979 with total page 1068 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the 19th International Conference on High Energy Physics Tokyo August 23 30 1978 written by and published by . This book was released on 1979 with total page 1064 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings written by and published by . This book was released on 1979 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Casimir Dependence of Transverse Distribution of Pairs Produced from a Strong Constant Chromo electric Background Field written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recently the transverse distribution of particle production from strong constant chromo-electric fields has been explicitly calculated in Ref. 1 for soft-gluon production and in Ref. 2 for quark (antiquark) production. This particle production method, originally discussed by Heisenberg and Euler, Schwinger and Weisskopf, has a long history as a model of the production of the quark gluon plasma following a relativistic heavy ion collision. The physical picture considered here is that of two relativistic heavy nuclei colliding and leaving behind a semi-classical gluon field which then non-perturbatively produces gluon and quark-antiquark pairs via the Schwinger mechanism. At high energy large hadron colliders, such as RHIC (Au-Au collisions at √{ovr s} = 200 GeV) and LHC (Pb-Pb collisions at √{ovr s} = 5.5 TeV), about half the total center-of-mass energy, E{sub cm}, goes into the production of a semi-classical gluon field, which can be thought to be initially in a Lorentz contracted disc. The gluon field in SU(3) is described by two Casimir invariants, the first one, C1 = E{sup a}E{sup a}, being related to the energy density of the initial field, where the second one, C2 = [d{sub abc}E{sup a}E{sup b}E{sup c}]2, is related to the SU(3) color hypercharge left behind by the leading particles. So the question we want to study in this short note is how sensitive the transverse distribution is to this second Casimir invariant C2. We have considered the dependence of the pair production rate of quarks and gluons from a strong chromo-electric field and have discovered that the effect of the second Casimir invariant of SU(3), which was not present in the electric field problem, effects the distribution by less than 15%. This event by event dependence of the transverse momentum distribution of jets on C2 may be something of interest at heavy ion colliders.

Download or read book La Guerra del Millecinquecento written by and published by . This book was released on 1845 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: