C. Merino

On the behavior of the effective QCD coupling alpha(tau)(s) at low scales

The hadronic decays of the τ lepton can be used to determine the effective charge ατ(m τ 2,) for a hypothetical τ lepton with a mass in the range 0<m τ,<mτ. This definition provides a fundamental definition of the QCD coupling at low mass scales. We study the behavior of α τ at low mass scales directly from first principles and without any renormalization-scheme dependence by looking at the experimental data from the OPAL Collaboration. The results are consistent with the freezing of the physical coupling at mass scales s = m τ 2, of order 1 GeV 2 with a magnitude α τ ∼0.9 ±0.1.

Odderon-Pomeron Interference ∗

Abstract We show that the asymmetry in the fractional energy of charm versus anticharm jets produced in high energy diffractive photoproduction is sensitive to the interference of the Odderon ( C =−) and Pomeron ( C =+) exchange amplitudes in QCD. We predict the dynamical shape of the asymmetry in a simple model and estimate its magnitude to be of the order 15% using an Odderon coupling to the proton which saturates constraints from proton-proton vs. proton-antiproton elastic scattering. Measurements of this asymmetry at HERA could provide firm experimental evidence for the presence of Odderon exchange in the high energy limit of strong interactions.

Strange-baryon production asymmetry in K ± N interactions

Abstract.The asymmetry of strange-baryon production in Kp interactions at high energies is considered in the framework of the Quark-Gluon String Model. The contribution of the string-junction mechanism to the strange baryon production is analysed.

Quark-gluon string-model description of baryon production in K ± N interactions

AbstractThe process of baryon production in Kp collisions at high energies is considered in the framework of the quark-gluon string model. The contribution of the string-junction mechanism to the strange-baryon production is analyzed. The results of numerical calculations are in reasonable agreement with the data on inclusive spectra of p, Λ, % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfKttLearuqr1ngBPrgarmWu51MyVXgatC% vAUfeBSjuyZL2yd9gzLbvyNv2CaeHbd9wDYLwzYbItLDharyavP1wz% ZbItLDhis9wBH5garqqtubsr4rNCHbGeaGqiVu0Je9sqqrpepC0xbb% L8F4rqqrFfpeea0xe9Lq-Jc9vqaqpepm0xbba9pwe9Q8fs0-yqaqpe% pae9pg0FirpepeKkFr0xfr-xfr-xb9adbaqaaeGaciGaaiaabeqaam% aaeaqbaaGcbaGafu4MdWKbaebaaaa!3C58!

Jet asymmetry and the detection of Odderon exchange in DIS

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Basic Features of High-Energy Hadronic Interactions

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THEORETICAL APPROACHES TO HERA PHYSICS

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