Abstract
The Drell-Yan process is a copious source of lepton pairs at high energy and is measured with great precision at the Large Hadron Collider (LHC). Barring any new light particles, beyond the Standard Model effects can be studied in Drell-Yan production using an effective field theory. At tree level, new 4-fermion interactions dominate, while at one loop operators modifying 3-gauge boson couplings contribute effects that are enhanced at high energy. We study the sensitivity of the neutral Drell-Yan process to these dimension-6 operators and compare the sensitivity to that of $W^+W^-$ pair production at the LHC.
Highlights
INTRODUCTIONWithout new low scale particles, the only tools available for studying deviations from the SM predictions are effective field theories (EFT)
The exploration of the electroweak sector is a major task for the Large Hadron Collider (LHC)
In the absence of new light physics, the effective field theories (EFT) approach provides a parametrization of beyond the SM (BSM) effects in terms of higher dimension operators
Summary
Without new low scale particles, the only tools available for studying deviations from the SM predictions are effective field theories (EFT) In this approach, low scale physics is assumed to be sensitive to the presence of higher dimension operators. We study neutral Drell-Yan production in the context of the Standard Model effective field theory (SMEFT) [23], where the Higgs boson is assumed to be part of an SUð2Þ doublet. We find that while Drell-Yan provides additional information, the impact of anomalous 3-gauge boson interactions is generally more observable in WþW− pair production. [38] affect the Drell-Yan process at tree level, and unless they are set to zero, as in a universal theory, they can overwhelm the impact of loop corrections from other operators.
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