Quarkonia decays into two photons induced by space-time noncommutativity

Abstract

In this article we propose standard model strictly forbidden decay modes, quarkonia ( QQ 1 ÿÿ J= ; ) decays into two photons, as a possible signature of space-time noncommutativity. An experimental discovery of J= ! and/or ! processes would certainly indicate a violation of the LandauPomeranchuk-Yang theorem and a definitive appearance of new physics.

Higgs-strahlung and pair production in thee+e−collision in the noncommutative standard model

“…(16) and (17), which is corresponding to the case as that in Ref. [10], i.e., the process is only Z mediated.…”

Enveloping algebra Noncommutative SM: Renormalisability and High Energy Physics Phenomenology

“…Considering SM forbidden decays, recently we have found the following lower limit Λ NC > 1 TeV [18] from Z → γγ decay. Note here that earlier limits obtained from γ pl → ν ν decay (astrophysics analysis) produces Λ NC > 81 GeV [19] while from the SM forbidden J/ψ → γγ and K → πγ [20] decays we obtain Λ NC > 9 GeV, and Λ NC > 43 GeV, respectively. Last two bounds are not usefull due to the too high lower limit of the relevant branching ratios.…”

“…In this article we consider θ-expanded theories, constructed as an effective, anomaly free [11] and one-loop renormalizable NCGFT [12,14,15,16], at the first order in noncommutative parameter θ. Finally we discuss related phenomenology and determine the scale of noncommutativity Λ NC , [18,19,20].…”

PHOTON-NEUTRINO INTERACTION IN Θ-Exact COVARIANT MODEL: PHENOMENOLOGY AND QUANTUM PROPERTIES

“…This fact is particularly true for the models constructed by using SW map expansion in the NC parameter θ, including NCSM [9][10][11][12]. However the resulting models are very useful as effective field theories including relevant phenomenology [13][14][15][16] and their one-loop quantum properties [17][18][19][20][21][22][23][24][25][26][27].…”