Probing the noncommutative standard model at hadron colliders

Abstract

We study collider signals for the noncommutative extension of the standard model using the Seiberg-Witten maps for SU(3) C ⊗SU(2) L ⊗ U(1) Y to first order in the noncommutativity parameters θ µν . In particular, we investigate the sensitivity of Zγ-production at the Tevatron and the LHC to the components of θ µν . We discuss the range of validity of this approximation and estimate exclusion limits from a Monte Carlo simulation. *

Noncommutative standard model in the top quark sector

“…The obtained limit on Λ N C from W boson polarization is higher than the one obtained from the top width and also is higher than the limits obtained in [28] from Zγ production and the limits estimated in [34] from SM forbidden decays. The 95% exclusion contours on B 1,2,3 lead to |θ ij | ≤ 10 −7 GeV −2 .…”

“…With the increase in Λ N C , F R approaches the SM value which is zero. The combination of the upper limit on F R measured by CDF, mentioned in Section 3, and the above relation leads to: This bound is higher than the one obtained in [28] (from Zγ production at the Tevatron and the LHC) and the bound obtained in [34] from SM forbidden decays which is Λ N C > 1…”

“…The effects of noncommutative space-time on some rare decay, collider processes, leptonic decay of the W and Z bosons and additional phenomenological results have been presented in [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [39] and some limits have been set on noncommutative scale.…”

Hybrid Seiberg-Witten map, itsθ-exact expansion, and the antifield formalism

“…Some phenomenological consequences that arise when the standard model is formulated on noncommutative spacetime have been analyzed in Refs. [7][8][9][10][11][12][13][14][15][16][17][18]. The general construction of noncommutative grand unified theories was discussed in Ref.…”

Drell-Yan process as an avenue to test a noncommutative standard model at the Large Hadron Collider

“…In the context of LHC, the following investigations are in order. Noncommutative contribution of neutral vector boson (γ, z) pair production was studied [23] at the LHC and obtained the bound for the NC scale Λ ≥ 1 TeV under some conservative assumptions.…”