The production of heavy particles at hadron colliders is associated with radiation of additional quarks and gluons from incoming partons. They can have significant transverse momenta and the additional initial state radiation (ISR) jets complicate the reconstruction of new particle masses. Taking gluino pair production and decay at the Large Hadron Collider as an example, we develop a novel tec...

simulation of gamma and hadron showers in the energy range 100gev- 25tev has been carried out. for a big ideal cherenkov light array, characteristics of lateral distribution of cherenkov photon density have been studied. results from this ideal detector are compared with those simulated for a real tunka- like array to investigate experimental potential of using existence of a hump in lateral di...

We show that linearly polarized gluons inside unpolarized hadrons can be directly probed in jet or heavy quark pair production in electron-hadron collisions. We discuss the simplest cos2ϕ asymmetries and estimate their maximal value, concluding that measurements of the unknown linearly polarized gluon distribution in the proton should be feasible in future Electron-Ion Collider or Large Hadron ...

We study nuclear shadowing in J/ψ and Υ production in hadron-nucleus interactions and in nucleus-nucleus collisions at the Relativistic Heavy Ion Collider and the Large Hadron Collider. As a consequence of the perturbative Q2-dependence of gluon shadowing, we predict that Υ production is less suppressed than the J/ψ. We show that antishadowing leads to enhanced J/ψ production at xf ∼ 0, an effe...

Measurements of intermediate pT (1.5 < pT < 5.0 GeV/c) identified particle distributions in heavy ion collisions at SPS and RHIC energies display striking dependencies on the number of constituent quarks in the corresponding hadron. One finds that elliptic flow at intermediate pT follows a constituent quark scaling law as predicted by models of hadron formation through coalescence. In addition,...

We investigate Higgs boson pair production at hadron colliders for Higgs boson masses mH<140 GeV and the rare decay of one of the two Higgs bosons. While in the standard model the number of events is quite low at the CERN Large Hadron Collider ~LHC!, a first, albeit not very precise, measurement of the Higgs boson self-coupling is possible in the gg→HH→bb̄gg channel. A luminosity-upgraded LHC co...

In high energy collisions of leptons, hadrons and nuclei we observe the production of many particles, mainly hadrons. The ultimate goal in multiparticle production studies is the explanation of the hadronic phenomena within QCD, the basic theory of the strong interactions, along with the other interactions of the standard model and possibly beyond. A basic problem in the QCD study of multiparti...

The inclusive charged hadron momentum spectra from the $ and $' decays produced in e+ecoilisions at SPEAR are presented, The data were obtained with a small solid-angle, single-arm magnetic spectrometer with good particle identification abilities centered at 90 degrees with respect to the beams. The particle-separated invariant cross sections are compared with data from e+ecollisions at 6 = 4.8...

The role of gauge invariance in single-spin asymmetries. The Sivers single-spin asymmetry in photon-jet production. DESY-07-028 (2007), hep-ph/0703153. Single-transverse spin asymmetry in dijet correlations at hadron colliders. Gluonic pole cross-sections and single spin asymmetries in hadron-hadron scattering. JHEP 02, 029 (2007), hep-ph/0609206. The construction of gauge-links in arbitrary ha...

Hadron production in lepton-nucleus deep inelastic scattering is studied in an absorption model. In the proposed model, the early stage of hadronization in the nuclear medium is dominated by prehadron formation and absorption, controlled by flavor-dependent formation lengths and absorption cross sections. Computations for hadron multiplicity ratios are presented and compared with the HERMES exp...