By A Deshpande; R Milner; R Venugopalan; W Vogelsang
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Extra info for Study of the Fundamental Structure of Matter with an Electron-Ion Collider
Indeed, bulk features of multiplicity distributions may be described by the CGC precisely as a consequence of early thermalization–leading to entropy conservation (254). Initial-state effects will be more important in heavy ion collisions at the LHC because one is probing smaller x in the wave function. Measurements of saturation scales for nuclei at the EIC will independently corroborate equations such as Eq. 37 and therefore the picture of heavy ion collisions outlined above. Further, a systematic study of energy loss in cold matter will help constrain extrapolations of pQCD (131) used to study jet quenching in hot matter.
A unique application of eRHIC would be to study the parton distributions of polarized quasi-real photons, defined as (172, 173) γ γ γ γ ∆f γ (x) ≡ f++ (x) − f−+ (x) , (31) where f++ (f−+ ) denotes the density of a parton f = u, d, s, . . , g with positive (negative) helicity in a photon with positive helicity. The ∆f γ (x) give information on the spin structure of the photon; they are completely unmeasured so far. Figure 22 shows samples from studies (174,175) for observables at eRHIC that would give information on the ∆f γ (x).
Deshpande et al. our knowledge of the hadronic structure of the photon. The structure of the photon manifests itself in so-called “resolved” contributions to cross sections. We show this in Figure 21 for the case of photoproduction of hadrons. On the left, the photon participates itself in the hard scattering, through “direct” contributions. On the right, the photon behaves like a hadron. This possibility occurs because of (perturbative) short-time fluctuations of the photon into q q¯ pairs and gluons, and because of (non-perturbative) fluctuations into vector mesons ρ, φ, ω with the same quantum numbers (170).
Study of the Fundamental Structure of Matter with an Electron-Ion Collider by A Deshpande; R Milner; R Venugopalan; W Vogelsang