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Title: Nonzero Z{yields}{gamma}{gamma} decays in the renormalizable gauge sector of the noncommutative standard model

Abstract

In this report we propose the Z{yields}{gamma}{gamma} decay as a process strictly forbidden in the standard model, suitable for the search of noncommutativity of coordinates at very short distances. We computed the Z{yields}{gamma}{gamma} partial width in the framework of the recently proposed one-loop renormalizable gauge sector of the noncommutative standard model. New experimental possibilities at the Large Hadron Collider are analyzed and a firm bound to the scale of noncommutativity parameter is set around 1 TeV.

Authors:
; ;  [1];  [2]
  1. Faculty of Physics, University of Belgrade, P.O. Box 368, 11001 Belgrade (Serbia)
  2. Theoretical Physics Division, Rudjer Boskovic Institute, P.O. Box 180, 10002 Zagreb (Croatia)
Publication Date:
OSTI Identifier:
21020523
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.75.097701; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CERN LHC; COMMUTATION RELATIONS; PARTICLE DECAY; PHOTONS; RENORMALIZATION; STANDARD MODEL; TEV RANGE; Z NEUTRAL BOSONS

Citation Formats

Buric, M., Latas, D., Radovanovic, V., and Trampetic, J. Nonzero Z{yields}{gamma}{gamma} decays in the renormalizable gauge sector of the noncommutative standard model. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.097701.
Buric, M., Latas, D., Radovanovic, V., & Trampetic, J. Nonzero Z{yields}{gamma}{gamma} decays in the renormalizable gauge sector of the noncommutative standard model. United States. doi:10.1103/PHYSREVD.75.097701.
Buric, M., Latas, D., Radovanovic, V., and Trampetic, J. Tue . "Nonzero Z{yields}{gamma}{gamma} decays in the renormalizable gauge sector of the noncommutative standard model". United States. doi:10.1103/PHYSREVD.75.097701.
@article{osti_21020523,
title = {Nonzero Z{yields}{gamma}{gamma} decays in the renormalizable gauge sector of the noncommutative standard model},
author = {Buric, M. and Latas, D. and Radovanovic, V. and Trampetic, J.},
abstractNote = {In this report we propose the Z{yields}{gamma}{gamma} decay as a process strictly forbidden in the standard model, suitable for the search of noncommutativity of coordinates at very short distances. We computed the Z{yields}{gamma}{gamma} partial width in the framework of the recently proposed one-loop renormalizable gauge sector of the noncommutative standard model. New experimental possibilities at the Large Hadron Collider are analyzed and a firm bound to the scale of noncommutativity parameter is set around 1 TeV.},
doi = {10.1103/PHYSREVD.75.097701},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 75,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}
  • The approach to the Z {yields} {gamma}{psi} and Z {yields} {gamma}Y decay study is presented in detail, based on the sum rules for the Z {yields} cc-bar {yields} {gamma}{gamma}* and Z {yields} bb-bar {yields} {gamma}{gamma}* amplitudes and their derivatives. The branching ratios of the Z {yields} {gamma}{psi} and Z {yields} {gamma}Y decays are calculated for different hypotheses on saturation of the sum rules. The lower bounds of {Sigma}{sub {psi}} BR(Z {yields} {gamma}{psi}) = 1.95 Multiplication-Sign 10{sup -7} and {Sigma}{sub {upsilon}} BR(Z {yields} {gamma}Y) = 7.23 Multiplication-Sign 10{sup -7} are found. Deviations from the lower bounds are discussed, including the possibilitymore » of BR(Z {yields} {gamma}J/{psi}(1S)) {approx} BR(Z {yields} {gamma}Y(1S)) {approx} 10{sup -6}, that could be probably measured in LHC. The angular distributions in the Z {yields} {gamma}{psi} and Z {yields} {gamma}Y decays are also calculated.« less
  • The one-loop induced Z{yields}gg{gamma} and Z{sup '}{yields}gg{gamma} decays are studied within the context of the minimal 331 model, which predicts the existence of new gauge bosons and three exotic quarks. It is found that the Z{yields}gg{gamma} decay is insensitive to the presence of the exotic quarks, as it is essentially governed by the first two families of known quarks. As to the Z{sup '}{yields}gg{gamma} decay, it is found that the exotic quark contribution dominates and that for a heavy Z{sup '} boson it leads to a {gamma}(Z{sup '}{yields}gg{gamma}) that is more than 1 order of magnitude larger than that associatedmore » with {gamma}(Z{sup '}{yields}ggg). This result may be used to distinguish a new neutral Z{sup '} boson from those models that do not introduce exotic quarks.« less
  • In this article we aim to estimate the bounds on the noncommutative scale {lambda}{sub NC} and to extract the 95% exclusion contours for some {theta}{sub {mu}}{sub {nu}} components using the recent measurements of the top quark width and the W boson polarization in top pair events from CDF experiments at Tevatron.
  • We study muon pair production e{sup +}e{sup -{yields}{mu}+{mu}-} in the noncommutative (NC) extension of the standard model using the Seiberg-Witten maps of this to the second order of the noncommutative parameter {Theta}{sub {mu}{nu}}. Using O({Theta}{sup 2}) Feynman rules, we find the O({Theta}{sup 4}) cross section (with all other lower order contributions simply cancelled) for the pair production. The momentum dependent O({Theta}{sup 2}) NC interaction significantly modifies the cross section and angular distributions which are different from the commuting standard model. We study the collider signatures of the space-time noncommutativity at the International Linear Collider (ILC) and find that the processmore » e{sup +}e{sup -{yields}{mu}+{mu}-} can probe the NC scale {Lambda} in the range 0.8-1.0 TeV for typical ILC energy ranges.« less