15 research outputs found
Neutrino-electron scattering in noncommutative space
Neutral particles can couple with the gauge field in the adjoint
representation at the tree level if the space-time coordinates are
noncommutative (NC). Considering neutrino-photon coupling in the NC QED
framework, we obtain the differential cross section of neutrino-electron
scattering. Similar to the magnetic moment effect, one of the NC terms is
proportional to , where is the electron recoil energy.
Therefore, this scattering provides a chance to achieve a stringent bound on
the NC scale in low energy by improving the sensitivity to the smaller electron
recoil energy.Comment: 12 pages, 2 figure
TeV Scale Implications of Non Commutative Space time in Laboratory Frame with Polarized Beams
We analyze , and processes within the
Seiberg-Witten expanded noncommutative scenario using polarized beams. With
unpolarized beams the leading order effects of non commutativity starts from
second order in non commutative(NC) parameter i.e. , while with
polarized beams these corrections appear at first order () in cross
section. The corrections in Compton case can probe the magnetic
component() while in Pair production and Pair annihilation
probe the electric component() of NC parameter. We include the
effects of earth rotation in our analysis. This study is done by investigating
the effects of non commutativity on different time averaged cross section
observables. The results which also depends on the position of the collider,
can provide clear and distinct signatures of the model testable at the
International Linear Collider(ILC).Comment: 22 pages, 19 figures, new comments and references added, few typos
corrected, Published in JHE
On UV/IR mixing in noncommutative gauge field theories
In formulating gauge field theories on noncommutative (NC) spaces it is
suggested that particles carrying gauge invariant quantities should not be
viewed as pointlike, but rather as extended objects whose sizes grow linearly
with their momenta. This and other generic properties deriving from the
nonlocal character of interactions (showing thus unambiguously their
quantum-gravity origin) lead to a specific form of UV/IR mixing as well as to a
pathological behavior at the quantum level when the noncommutativity parameter
theta is set to be arbitrarily small. In spite of previous suggestions that in
a NC gauge theory based on the theta-expanded Seiberg-Witten (SW) maps UV/IR
mixing effects may be under control, a fairly recent study of photon
self-energy within a SW theta-exact approach has shown that UV/IR mixing is
still present. We study the self-energy contribution for neutral fermions in
the theta-exact approach of NC QED, and show by explicit calculation that all
but one divergence can be eliminated for a generic choice of the
noncommutativity parameter theta. The remaining divergence is linked to the
pointlike limit of an extended object.Comment: 10 pages, a figure added, version to appear in JHE
Polarized electron-muon neutrino scattering to electron and neutrino in noncommutative space
For neutrino scattering from polarized electron, the weak interaction term in the cross section is significantly suppressed by the polarized term. The magnetic moment term does not receive any correction from the electron polarization. Hence, the study of the magnetic moment of neutrinos through scattering from the polarized electron leads to a stronger bound on the neutrino magnetic moment compared with the unpolarized case. On the other hand, neutrinos which are electrically neutral can couple directly with photons in Noncommutative (NC) QED. In this paper, we calculate the NC QED corrections on this scattering are calculated. The phase difference between the NC term and the polarized weak interaction term is π/2. Therefore, the NC term does not destroy the above suppression