Drell-Yan trial
The Drell – Yan process is a hadron- hadron scattering process in high energy physics . This is understood to mean the mutual annihilation of a quark from one hadron with an antiquark from another hadron, forming a virtual photon or Z boson , which then decays into a pair of oppositely charged leptons .
The Drell – Yan process was first proposed in 1970 by Sidney Drell and Tung-Mow Yan to describe the production of lepton- antilepton pairs in high-energy collisions of hadrons. This process was first used experimentally by JH Christenson et al. observed in proton - uranium collisions at Brookhaven National Laboratory , Alternating Gradient Synchrotron .
overview
The Drell-Yan process provides important information about the Parton distribution functions , which are an essential part of the calculation and prediction of all processes in hadron accelerators . So far it has not been possible to calculate the Parton distribution functions directly, but only to determine them experimentally on accelerators.
The production of Z bosons in the Drell-Yan process offers the possibility of the couplings, i.e. H. to investigate the interaction strength of the Z boson with quarks. The most important observation variable is the forward-backward asymmetry of the angular distribution of the two generated leptons in their center of gravity .
If heavier, neutral gauge bosons such as the Z'-boson exist, they could be detected as a peak in the spectrum of the invariant mass of the lepton pair, just as the Z-boson of the Standard Model can be seen there.
swell
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↑ SD Drell, T.-M. Yan: Massive Lepton-Pair Production in Hadron-Hadron Collisions at High Energies . In: Physical Review Letters . 25, No. 5, 1970, pp. 316-320. doi : 10.1103 / PhysRevLett.25.316 .
- and the erratum in
- ^ JH Christenton, GS Hicks, LM Lederman, PJ Limon, BG Pope, E. Zavatinni: Observation of Massive Muon Pairs in Hadron Collisions . In: Physical Review Letters . 25, No. 21, 1970, pp. 1523-1526. doi : 10.1103 / PhysRevLett.25.1523 .