Instantons in lepton pair production
نویسندگان
چکیده
منابع مشابه
Angular Distributions in the Lepton Pair Production
The angular distributions of high mass lepton pairs are reviewed. It is argued that the detailed study of polar distributions provide the evidence for the substantial contributions to the Drell-Yan process from the higher order QCD effects. It is also pointed out that the first order QCD "Comptonfl diagrams predict non-trivial azimuthal dependence which could be measured experimentally. (Contri...
متن کاملSchwinger Pair Production via Instantons in a Strong Electric Field
In the space-dependent gauge, each mode of the Klein-Gordon equation in a strong electric field takes the form of a time-independent Schrödinger equation with a potential barrier. We propose that the singleand multi-instantons of quantum tunneling may be related with the singleand multi-pair production of bosons and the relative probability for the no-pair production is determined by the total ...
متن کاملLepton Pair Production in Tagged Collisions at the L3 Experiment
We studied lepton pair production in single-tagged events using the L3 detector at LEP. A measurement of the process cross section is given for 1:4 GeV 2 < Q 2 < 7:6 GeV 2 and 60 GeV 2 < Q 2 < 140 GeV 2. The F 2 photon structure function is then extracted at < Q 2 >= 1:7 GeV 2. Finally a study of az-imuthal correlations is used to gain access to some so far unmeasured photon structure functions.
متن کاملLepton pair production in heavy ion collisions and hadronic phenomenology
We first review the calculations of low invariant mass dilepton production in relativistic heavy ion collisions, using effective hadronic Lagrangians. We go through some of the theoretical techniques used in this kinematical region and we consider some of the appropriate experimental measurements. Moving up to the intermediate invariant mass region, we point out some of the uncertainties that s...
متن کاملNuclear Effects in J / tl , and Lepton - Pair Production
1. Introduction High-energy processes in nuclear media provide important tests of quantum chromodynamics, since in principle one can use the nuclear environment to perturb and study the mechanisms involved in confinement and hadronization. In this talk I will discuss several examples of nuclear effects in QCD affecting the propagation and hadronization of quarks and gluons in nuclear matter. Th...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2006
ISSN: 0550-3213
DOI: 10.1016/j.nuclphysb.2006.07.020