We present a next-to-leading order calculation for the virtual photoproduction of one and two jets in ep collisions. Soft and collinear singularities are extracted using the phase space slicing method. The collinear photon initial state singularity depends logarithmically on the mass of the virtual photon and is absorbed into the virtual photon structure function. An MS factorization scheme is ...

Approximately taking into account the higher-order e ects due to multiple-gluon initial-state radiation, we extract from the latest Tevatron data of prompt J= hadroproduction the leading colour-octet matrix elements within the nonrelativisticQCD (NRQCD) factorization formalism proposed by Bodwin, Braaten, and Lepage. We nd that the matrix elements which describe the formation of J= mesons from ...

Background: Amyloid precursor protein (APP) undergoes cleavage under physiological conditions, predominantly by αand γ-secretases, to form the nonpathogenic sAPPα and p3 fragments. By contrast, amyloid-beta (Aβ) is produced via proteolytic cleavage by βand γ-secretases. In Alzheimer’s disease (AD), APP is preferentially processed via the amyloidogenic pathway, producing large amounts of Aβ that...

We present next-to-leading order calculations of oneand two-jet production in eP collisions at HERA for photon virtualities in the range 1 < Q2 < 100 GeV2 . Soft and collinear singularities are extracted using the phase space slicing method. Numerical results are presented for HERA conditions with the Snowmass jet definition. The transition between photoproduction and deep-inelastic scattering ...

The next-to-leading-order (NLO) cross section for the production of heavy quarks at large transverse momenta (p⊥) in γγ collisions is calculated with perturbative fragmentation functions (PFF’s). This approach allows for a resummation of terms ∝ αs ln(p2⊥/m2) which arise in NLO from collinear emission of gluons by heavy quarks at large p⊥ or from almost collinear branching of photons or gluons ...

Approximately taking into account the higher-order effects due to multiple-gluon initial-state radiation, we extract from the latest Tevatron data of prompt J/ψ hadroproduction the leading colour-octet matrix elements within the nonrelativisticQCD (NRQCD) factorization formalism proposed by Bodwin, Braaten, and Lepage. We find that the matrix elements which describe the formation of J/ψ mesons ...

The cross section for the photoproduction of large-pT J/ψ mesons at HERA is calculated at next-to-leading order, adopting a perturbative approach to describe the fragmentation of charm quarks and gluons into J/ψ mesons. We treat the charm quark according to the massless factorization scheme, where it is assumed to be one of the active flavours inside the proton and the resolved photon. We prese...

The strength of the Yukawa coupling of the leptons and quarks with the Higgs boson is uniquely determined by the Higgs mechanism for generating masses in the Standard Model. The top-Higgs coupling can be measured directly in the process ee → tt̄H. This process therefore provides a fundamental test of the Higgs mechanism. Extending earlier analyses carried out in the Born approximation, we have d...