Tau contribution and precision measurement of theta23 at a neutrino factory

We discuss precision measurements of the leading atmospheric parameters at a standard neutrino factory. The oscillation of the muon and electron neutrinos (anti-neutrinos) to tau neutrinos (anti-neutrinos) adds to the muon events sample (both right sign and wrong sign) via leptonic decays of the taus produced through charge-current interactions in the detector. We focus on how this contribution affects a precision measurement of the atmospheric mixing parameters and the deviation of muon neutrino -- tau neutrino mixing from maximality.Comment: 4 pages, 5 figures, presented by NS at the 11th International Workshop on Neutrino Factories, Superbeams and Beta Beams (Nufact09), July 20-25, 2009, Illinois Institute of Technology, Chicago, US

Study of vector meson fragmentation using a broken SU(3) model

Inclusive hadro production in e^+ e^- annihilation processes is examined to study the fragmentation process. A broken SU(3) model is used to determine the quark and gluon fragmentation functions of octet vector mesons, \rho and K^*, in a simple way with an SU(3) breaking parameter \lambda. These are expressed in terms of just two light quark fragmentation functions, V(x, Q2) and \gamma(x, Q2) and the gluon fragmentation function Dg(x, Q2). These functions are parameterized at the low input scale of Q0^2 = 1.5 GeV2, evolved through LO DGLAP evolution including charm and bottom flavour at appropriate thresholds, and fitted by comparison with data at the Z-pole. The model is extended with the introduction of a few additional parameters to include a study of singlet--octet mixing and hence \omega and \phi fragmentation. The model gives good fits to the available data for x >~ 0.01, where x is the scaled energy of the hadron. The model is then applied successfully to \omega, \phi production in pp collisions at the Relativistic Heavy Ion Collider, RHIC; these data form an important base-line for the study of Quark Gluon Plasma in heavy nucleus collisions at RHIC, and also in future at the LHC.Comment: 27 pages PRD-latex with 10 eps figure files; modified to include an analysis of RHIC pp dat

Nuclear Structure Functions

We present a general review of currently popular models of bound nucleon structure functions. The $Q^2$ dependence predicted by various models is highlighted; in principle, this can be used to experimentally distinguish between various mo