Momentum Spectra in the Current Region of the Breit Frame in Deep Inelastic Scattering at HERA
نویسنده
چکیده
The production of charged particles has been measured in deep inelastic scattering (DIS) with the ZEUS detector. The evolution of the moments of the scaled momenta distributions in Q 2 and x has been investigated in the current fragmentation region of the Breit frame. The results in the current region are compared to e + e − data and QCD analytical calculations. The results are consistent with the universality of single-particle spectra in DIS and e + e − annihilation at high Q 2. The results at low Q 2 disagree with analytical calculations based on the modified leading log approximation (MLLA) and local parton hadron duality (LPHD).
منابع مشابه
Scaled Momentum Spectra in Deep Inelastic Scattering
Charged particle production has been studied in deep inelastic scattering (DIS) using an integrated luminosity of about 0.44 fb−1 taken with the ZEUS detector at HERA. The fragmentation properties of the struck quark in deep inelastic scattering have been investigated in the current fragmentation region of the Breit frame as a function of the exchanged boson virtuality Q. The measured evolution...
متن کاملMultiplicity and momentum distributions of hadrons in deep inelastic scattering at HERA energies
The universality and scaling behaviour of hadronisation have been investigated in semi-inclusive neutral current deep inelastic ep scattering; specifically the multiplicity and scaled momentum spectra of charged hadrons have been measured and analysed. The measurements are performed in the current region of the Breit frame, as well as in the current fragmentation region of the hadronic centre-o...
متن کاملProgress in the Understanding of Dijet Production in Deep-Inelastic Scattering
Recent results on dijet production in deep-inelastic scattering from the H1 experiment at the ep-collider HERA are presented. Internal jet structure has been studied in terms of jet shapes and subjet multiplicities in the Breit frame. Both observables are seen to be well described by QCD models. We observe a broadening of the jets towards the proton direction and at lower transverse jet energie...
متن کاملInternal Jet Structure in Dijet Production in Deep-Inelastic Scattering
The internal jet structure in dijet production in deep-inelastic scattering is measured with the H1 detector at HERA. Jets with transverse energies ET,Breit > 5 GeV are selected in the Breit frame employing k⊥ and cone jet algorithms in the kinematic region of squared momentum transfers of 10 < Q . 120 GeV and x-Bjorken values of 2 ·10 . xBj . 8 ·10 . Jet shapes and subjet multiplicities are me...
متن کاملDoes Efficiency of High Energy Collisions Depend on a Hard Scale?
The multiplicity of charged hadrons in the current fragmentation region of both the c.m.s. and the Breit frame of deep inelastic scattering is calculated and compared with the HERA data. The results are in agreeement with Yang’s hypothesis that the efficiency of high energy processes increases at larger momentum transfer. CERN-TH/2000-075 March 2000 ∗) Permanent address: Institute for High Ener...
متن کامل