We present a multichannel-scattering calculation of elastic and inelastic cold collisions between two low-field seeking, metastable 88Sr [(5s5p)3P2] atoms in the presence of an external magnetic field. The scattering physics is governed by strong anisotropic long-range interactions, which lead to pronounced coupling among the partial waves of relative motion. As a result, nonadiabatic transitio...

We present model calculations for the inelastic cross sections of electron collisions with tetrahedral molecules XH4 ~X5C, Si, Ge! when only the molecular ‘‘breathing’’ mode, n1 , is being excited. The collision energy range is well above the excited thresholds and up to 12 eV, where the adiabatic approximation for the inelastic T matrix is expected to hold. The results show the efficiency of t...

In this paper we address stereo-dynamical issues in the inelastic encounters between OH (chi2pi) radicals and HCl (chi1sigma+). The experiments were performed in a crossed molecular-beam machine at the nominal collision energy of 920 cm(-1). Prior to the collisions, the OH molecules were selected using a hexapole in a well-defined rotational state v=0, omega=32, J=32, M(J)=32, f, and subsequent...

relaxation induced by spin-orbit coupling in cold antimony-helium collisions. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We investigate Zeeman relaxation in c...

HADRON PRODUCTION IN NUCLEAR COLLISIONS A NEW PARTON MODEL APPROACH* 4 Stanley J, Brodsky Stanford Linear Accelerator Center Stanford University, Stanford, California 94305 John F. Gunion Department of Physics University of California, Davis, California 95616 J, H. Kchn Max Planck Ins$itut fcr Physik und Astrophysik Munchen 40, Germany ABSTRACT We consider a simple quark-parton model for inelas...

We discuss novel QCD phenomena in pA collisions at LHC energies such as the possibility to invesigate the behaviour of hard processes at x as low as 10 −7 , signals for onset of the black body limit in the hard processes and in the nucleon fragmentation, multijet production. 1. Physics motivations The proton-ion collisions at LHC will be qualitatively different from those at fixed target energi...

Recent observation of high-pT hadron spectra suppression and mono-jet production in central Au + Au collisions and their absence in d + Au collisions at RHIC have confirmed the long predicted phenomenon of jet quenching in high-energy heavy-ion collisions. Detailed analyses of the experimental data also show parton energy loss as the mechanism for the discovered jet quenching. Using a pQCD part...

We report on the dynamics of ultracold collisions induced by near-resonant frequency-chirped light. A series of identical chirped pulses, separated by a variable delay, is applied to an ultracold sample of Rb, and the rate of inelastic trap-loss collisions is measured. For small detunings of the chirped light below the atomic resonance, we observe that the rate of collisions induced by a given ...

Hadronic nal states are analyzed with the ZEUS detector for deep inelastic di ractive scattering ep ! eXp, in which the virtual photon dissociates into a hadronic nal state of mass 4 < MX < 35 GeV and the scattered proton, carrying more than 95% of the initial proton momentum, is detected in the Leading Proton Spectrometer. The event shape variables thrust and sphericity are studied as a functi...

We review applicability of QCD factorization theorem to multiple scattering in deeply inelastic lepton-nucleus scattering. We show why A1/3-type nuclear enhancement can be calculated consistently in perturbative QCD. We derive the transverse momentum broadening of the leading pions in deeply inelastic lepton-nucleus collisions. We argue that the measurement of such transverse momentum broadenin...