Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-09-22
Nucl.Phys.B814:15679,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
46 pages, 36 figures, comments and citations added
Scientific paper
10.1016/j.nuclphysb.2009.01.016
We quantify the impact of gauge anomalies at the Large Hadron Collider by studying the invariant mass distributions in Drell-Yan and in double prompt photon, using an extension of the Standard Model characterized by an additional anomalous U(1) derived from intersecting branes. The approach is rather general and applies to any anomalous abelian gauge current. Anomalies are cancelled using either the Wess-Zumino mechanism with suitable Peccei-Quinn-like interactions and a Stueckelberg axion, or by the Green-Schwarz mechanism. We compare predictions for the corresponding extra Z-prime to anomaly-free realizations such as those involving U(1)_{B-L}. We identify the leading anomalous corrections to both channels, which contribute at higher orders, and compare them against the next-to-next-to-leading order (NNLO) QCD background. Anomalous effects in these inclusive observables are found to be very small, far below the percent level and below the size of the typical QCD corrections quantified by NNLO K-factors.
Armillis Roberta
Coriano' Claudio
Guzzi Marco
Morelli Simone
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