Search

Abstract: We investigate the effect of one-loop corrections of on the invariant mass spectrum at the Large Hadron Collider (LHC) in presence of both resonant and non-resonant Higgs boson effects. We show that corrections of involving a non-resonant Higgs boson are comparable to or even larger than those involving interference with the s-channel resonant Higgs boson amplitude and that both of these are subdominant with respect to all other (non-Higgs) diagrams through that order. We also compute the contribution through of resonant Higgs boson production (i.e. Higgs production via gg fusion) as well as the pure QCD ones of . Altogether, we show that the well-known peak–dip structure of the spectrum emerging from interference effects between the -channel gg-induced Leading Order (LO) QCD diagrams and the one due to a Higgs boson in s-channel via gg-fusion is drastically swamped by the remainder of the terms of discussed above. [Copyright &y& Elsevier]

Abstract: I this talk I discuss the new HERA data on the structure function obtained from a combination of H1 and ZEUS results. Their high precision allows to determine the infrared behaviour of the BFKL forward amplitude for gluon–gluon scattering. This amplitude leads to an excellent description of the new data at low values of x (<0.01) and at the same time determines the unintegrated gluon density inside the proton, for squared transverse momenta of the gluon less than . The phases of this amplitude are sensitive to the non-perturbative gluonic dynamics and to the presence of Beyond-the-Standard-Model particles at very high energies. [Copyright &y& Elsevier]