Abstract
The predicted high sensitivity of the nuclear modification factor for K– in SIDIS due to the QCD based effect of medium-induced flavour conversion in the fragmentation function is studied at HERMES experiment. Unlike π+, π– and K+ nuclear modification factor for K– is assumed to increase at high value of Bjorken variable xB and a hadron fraction energy z. The experimental signature of this phenomenon is an enhanced K– nuclear modification factor compared with those of K+ for high xB and z range. The z spectra of nuclear attenuation ratios for charged kaons in different slices of xB extracted on Ne, Kr and Xe targets will be presented and discussed.
Highlights
In Semi-Inclusive Deep Inelastic Scattering (SIDIS) process at large values of the struck quark momentum fraction xB (Bjorken variable), the virtual photon interacts mainly with the valence quarks (u and d) from the target of nucleus
Enhancement of K− meson is a consequence of medium-induced flavor conversion [1], but this requires large values of xB and z, to counter the effect of parton energy loss in SIDIS
The nuclear modification factor RhA/D, which can be measured experimentally, is defined as the ratio of the number of hadrons h produced per Deep-Inelastic Scattering (DIS) event on a nuclear target with the atomic mass number A to that for a deuterium (D) target, and can be written as: Nh(xB,z,ν,p2t )
Summary
In Semi-Inclusive Deep Inelastic Scattering (SIDIS) process at large values of the struck quark momentum fraction xB (Bjorken variable), the virtual photon interacts mainly with the valence quarks (u and d) from the target of nucleus. Since K− strange mesons consist of (s, u) quarks they can only come from pair production in the shower evolution of the u and d quarks. Their spectra are sensitive to the medium-induced flavor conversion during the propagation of the struck valence quark in the nucleus. Enhancement of K− meson is a consequence of medium-induced flavor conversion [1], but this requires large values of xB and z (fractional hadron energy), to counter the effect of parton energy loss in SIDIS. The ratio RhA/D depends on leptonic variables: the energy of the virtual photon ν and its positive four-momentum square Q2, and on hardonic variables: the fraction of the virtual-photon energy carried by the hadron z, and the square of the hadron momentum component transverse to the direction of the virtual photon p2t
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