The high production rate and x F > 0.33 of the doubly charmed baryons measured by the SELEX experiment is not amenable to perturbative QCD analysis. In this paper we calculate the production of the doubly heavy baryons with the double intrinsic charm Fock states whose existence is rigorously predicted by QCD. The production rate and the longitudinal momentum distribution are both reproduced. We also show that the production rates of the doubly charmed baryons and double J/ψ production observed by NA3 collaboration are comparable. Recent experimental results are reviewed. The production cross section of the doubly charmed baryons at a fixed-target experiment at the LHC is presented.

Samples of inclusive γ+2 jet and γ+3 jet events collected by the D0 experiment with an integrated luminosity of about 1 fb −1 in pp collisions at √ s = 1.96 TeV are used to measure cross sections as a function of the angle in the plane transverse to the beam direction between the transverse momentum (pT ) of the γ+leading jet system (jets are ordered in pT ) and pT of the other jet for γ + 2 jet, or pT sum of the two other jets for γ + 3 jet events. The results are compared to different models of multiple parton interactions (MPI) in the pythia and sherpa Monte Carlo (MC) generators. The data indicate a contribution from events with double parton (DP) interactions and are well described by predictions provided by the pythia MPI models with pT -ordered showers and by sherpa with the default MPI model. The γ + 2 jet data are also used to determine the fraction of events with DP interactions as a function of the azimuthal angle and as a function of the second jet pT .

No abstract

No abstract

Measurements of the Charge Asymmetry of the Dalitz Plot Parameters for Decays AbstractThe charge asymmetry of the g, h, and k Dalitz plot parameters for K ± → π ± π 0 π 0 decays has been measured with 35 GeV/c hadron beams at the 70 GeV IHEP accelerator. The g, h, and k values obtained appear to be identical for K ± decays within the errors quoted. In particular, the charge asymmetry A g = (g + −g − )/(g + + g − ) of the slope g is equal to (0.2 ± 1.9) · 10 −3 .