Abstract
The first detailed measurement of the dependence on target nuclear mass of the average squared transverse momentum 〈pt2〉 of π+, π−, and K+ mesons from deep-inelastic lepton scattering is obtained as a function of several kinematic variables. The data were accumulated at the Hermes experiment at Desy, in which the Hera 27.6 GeV lepton beam was scattered off several nuclear gas targets. The average squared transverse momentum was clearly observed to increase with atomic mass number. The effect increases as a function of Q2 and x and remains constant as a function of both the virtual photon energy ν and the fractional hadron energy z, except that it vanishes as z approaches unity.
Highlights
Hermes Collaboration / Physics Letters B 684 (2010) 114–118 u Istituto Nazionale di Fisica Nucleare, Sezione Roma 1, Gruppo Sanità and Physics Laboratory, Istituto Superiore di Sanità, 00161 Roma, Italy v TRIUMF, Vancouver, British Columbia V6T 2A3, Canada w Department of Physics, Tokyo Institute of Technology, Tokyo 152, Japan x Department of Physics, VU University, 1081 HV Amsterdam, The Netherlands y Andrzej Soltan Institute for Nuclear Studies, 00-689 Warsaw, Poland z Yerevan Physics Institute, 375036 Yerevan, Armenia article info
The basic process of hadronization in vacuum is described by a well-developed phenomenology, constrained primarily by data from inclusive hadron production in e+e− annihilation, semi-inclusive hadron multiplicities measured in deep-inelastic scattering (DIS) of leptons on protons and deuterons, and inclusive hadron yields from p–p scattering experiments
The nuclear modification of hadron production in DIS was first observed by the pioneering semi-inclusive DIS experiments at Slac [2], followed by measurements performed by the Emc [3] and the E665
Summary
Transverse momentum broadening of hadrons produced in semi-inclusive deep-inelastic scattering on nuclei Much more precise data were collected and analyzed by the Hermes Collaboration [5,6] as a function of the kinematic variables ν, z, Q 2, and pt2, where ν is the energy of the virtual photon, z the fractional hadron energy in the target rest frame, −Q 2 being the squared four-momentum of the virtual photon, and pt the transverse momentum of the produced hadron.
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