Measurement of J/ψ production in 280 GeV/c μ+ iron interactions

Aubert, J.J.; Bassompierre, G.; Becks, K. H.; Bertsch, Y.; Besson, Christian; Best, C.; Böhm, E.; Botterill, D.; Brasse, F.W.; Broll, C.; Carr, J.; Charles, B.J.; Clifft, R. W.; Cobb, J.H.; Coignet, G.; Combley, F.; Court, G.R.; Crespo, J.M.; Dalpiaz, P.; Dau, W.D.; Davies, Joshua; Déclais, Y.; Dobinson, R.; Dress, J.; Drees, J.; Edwards, A.; Edwards, M.; Favier, Jean; Ferrero, M. I.; Field, J. H.; Flauger, W.; Gabathuler, E.; Gamet, R.; Gayler, J.; Ghez, Ph.; Gößling, C.; Haas, J.; Hahn, U.; Hamacher, K.; Hayman, P.; Henckes, M.; Jokisch, H.; Kadyk, J.; Korbel, V.; Maire, M.; Massonnet, L.; Melissinos, Adrian C.; Mohr, W.; Montgomery, H. E.; Moser, K.; Mount, R.; Norton, P. R.; Osborne, A.M.; Payre, P.; Peroni, C.; Pessard, H.; Pietrzyk, U.; Rith, Klaus; Rousseau, Martine; Schlosser, E.; Schneegans, M.; Sloan, T.; Stockhausen, W.; Stier, H. E.; Thénard, J.M.; Thompson, J.C.; Urbán, L.; Holtey, G. von; Wahlen, H.; White, V.; Williams, D. C.; Williams, W. S. C.; Wimpenny, S.

doi:10.1016/0370-2693(80)90027-1

Cited by 44 publications

(2 citation statements)

References 16 publications

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“…We notice that for W-dependence of the γp → J/ψp differential cross section, extrapolated to the forward direction (t = 0), for different values of the subtraction constant T ψp (0) in the forward ψ-p scattering amplitude. The data are from SLAC[30], CERN/EMC[40], Fermilab[31], and HERA[34]. The black curve T ψp (0) = 22.45 shows the best fit value, with corresponding error band resulting from our fitting procedure.…”

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confidence: 99%

Accessing the real part of the forwardJ/ψ−pscattering amplitude fromJ/ψphotoproduction on protons around threshold

Gryniuk

Vanderhaeghen

2016

Phys. Rev. D

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We provide an updated analysis of the forward J/ψ-p scattering amplitude, relating its imaginary part to γp → J/ψp and γp → ccX cross section data, and calculating its real part through a once-subtracted dispersion relation. From a global fit to both differential and total cross section data, we extract a value for the spin-averaged J/ψ-p s-wave scattering length a ψp = 0.046 ± 0.005 fm, which can be translated into a J/ψ binding energy in nuclear matter of B ψ = 2.7 ± 0.3 MeV. We estimate the forward-backward asymmetry to the γp → e − e + p process around the J/ψ resonance, which results from interchanging the leptons in the interference between the J/ψ production and the Bethe-Heitler mechanisms. We show that to good approximation this asymmetry depends linearly on a ψp , and can reach values around -25% for forthcoming J/ψ threshold production experiments at Jefferson Lab. Its measurement can thus provide a very sensitive observable for a refined extraction of a ψp .

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mentioning

confidence: 99%

Accessing the real part of the forwardJ/ψ−pscattering amplitude fromJ/ψphotoproduction on protons around threshold

Gryniuk

Vanderhaeghen

2016

Phys. Rev. D

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“…However, there is still a large uncertainty in such a region of x for different PDF sets. In this calculation, we use the world-wide experimental data [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] for the exclusive photoproduction to perform a parametrization of the cross-section estimates. The measurements of photoproduction have been performed for more than forty years.…”

Section: Methodsmentioning

confidence: 99%

Photoproduction of J/ψ in non-single-diffractive p+p collisions *

et al. 2019

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Recently, significant enhancements of J/ψ production at very low transverse momenta were observed by the ALICE and STAR collaboration in peripheral hadronic A+A collisions. The anomaly excesses point to evidence of coherent photon-nucleus interactions in violent hadronic heavy-ion collisions, which were conventionally studied only in ultra-peripheral collisions. Assuming that the coherent photoproduction is the underlying mechanism which is responsible for the excess observed in peripheral A+A collisions, its contribution in p+p collisions with nuclear overlap, i.e. non-singlediffractive collisions, is of particular interest. In this paper, we perform a calculation of exclusive J/ψ photoproduction in non-single-diffractive p+p collisions at RHIC and LHC energies base on the pQCD motivated parametrization from world-wide experimental data, which could be further employed to improve the precision of phenomenal calculations for photoproduction in A+A collisions. The differential rapidity and transverse momentum distributions of J/ψ from photoproduction are presented. In comparison with the J/ψ production from hadronic interactions, we find that the contribution of photoproduction is negligible.

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