MUON PAIR PHOTOPRODUCTION AT 20.5 GeV
نویسندگان
چکیده
We have studied the production of muon pairs with invariant masses from 1 to 4 GeV by 20.5 GeV bremsstrahlung radiation. The invariant mass distribution has' a large deviation from the expected Bethe-Heitler shape which we attribute to the Q(3.1 GeV). We determine the $(3.1 GeV) photoproduction cross section to be 1 3.7 + 2.2 1.5 nb at an average photon energy of.18 GeV. (Submitted to Physics Letters) l %ork supported by U.S. National Science Foundation *Work supported by U.S. Energy Research and.Depelopment Administration. ~ /' .1'
منابع مشابه
Photoproduction of the Psi Particles *
The s and t dependence of incoherent +(3100) photoproduction from deuterium has been measured at the Stanford Linear Accelerator Center. $(3'700) photoproduction and #(3100) photoproduction from hydrogen have also been measured,Two narrow resonances have recently been discovered, the $(3100) and the zjJ(3700). l Since the original discovery, the $(3100) has been observed in photo-production by ...
متن کاملA Measurement of the Beauty and Charm Production Cross Sections at the ep Collider HERA
Heavy avor production at HERA is dominated by photoproduction where a quasi real photon scatters o a gluon in the proton While open D and hidden J charm have been measured since the rst real evidence of hidden beauty was seen only in The present analysis measures open beauty and charm photoproduction in the kinematic range Q GeV and yJB and uses data taken with the H detector in the years corre...
متن کاملMeasurement of the Forward-Backward Asymmetry in Bottom-Quark Pair Production Using Soft Muon
We investigate the forward-backward asymmetry, AFB, in b-quark pair production in protonantiproton collision at √ s = 1.96 GeV with the CDF detector. The soft muon tag technique has been applied to identify bb̄ production. Using the full CDF data set (6.9 fb−1) we have obtained the integrated asymmetry at particle level of AFB= (1.2 ± 0.7)% for dijet invariant mass above 40 GeV/c. Dependence of ...
متن کاملExclusive High Mass Di-leptons in CDF
In the Collider Detector at Fermilab, CDF, we have measured central exclusive production, p + p̄ → p + X + p̄, where X is a pair of leptons or photons and nothing else. In this talk I focus on central masses M(X) > 8 GeV/c. We measured QED production γγ → ee, μμ up to M(X) = 75 GeV/c, and candidates for photoproduction of Upsilons, γIP → Y (1S), Y (2S), Y (3S). I report a search for exclusive pho...
متن کاملGamma ray astronomy with muons
Although gamma ray showers are muon-poor, they still produce a number of muons sufficient to make the sources observed by GeV and TeV telescopes observable also in muons. For sources with hard gamma ray spectra there is a relative ‘enhancement’ of muons from gamma ray primaries as compared to that from nucleon primaries. All shower gamma rays above the photoproduction threshold contribute to th...
متن کامل