Fragmentation of transversely polarized quarks probed in transverse momentum distributions

We consider the various asymmetries, notably single spin asymmetries, that appear in leptoproduction as a consequence of the presence of time-reversal odd distribution functions. This could facilitate experimental searches for time-reversal odd phenomena.

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Time reversal odd distribution functions in leptoproduction

A Universal Gauge Theory Model Based on E6

Equation of state in the gravitational collapse of stars

We consider the standard model on a non-commutative space and expand the action in the non-commutativity parameter $\theta^{\mu \nu}$
 . No new particles are introduced; the structure group is $SU(3)\times SU(2)\times U(1)$
 . We derive the leading order action. At zeroth order the action coincides with the ordinary standard model. At leading order in $\theta^{\mu\nu}$
 we find new vertices which are absent in the standard model on commutative space-time. The most striking features are couplings between quarks, gluons and electroweak bosons and many new vertices in the charged and neutral currents. We find that parity is violated in non-commutative QCD. The Higgs mechanism can be applied. QED is not deformed in the minimal version of the NCSM to the order considered.

Stephen Gasiorowicz

Papers

Elementary particle physics