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arxiv 0906.2478 v1 pith:YHIPGPU6 submitted 2009-06-13 hep-ex

Transverse momentum broadening of hadrons produced in semi-inclusive deep-inelastic scattering on nuclei

classification hep-ex
keywords functionmomentumtransverseaveragedeep-inelasticenergyleptonmass
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The first direct measurement of the dependence on target nuclear mass of the average squared transverse momentum <pt**2> of pi+, pi-, 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 Q**2 and x and remains constant as a function of both the virtual photon energy nu and the fractional hadron energy z, except that it vanishes as z approaches unity.

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