Measurement of the Forward-Backward Asymmetry in the Drell-Yan Dilepton Production in Proton-Proton Collisions at the CMS Experiment at the LHC

V Shalaev,I Gorbunov,S Shmatov,A Verkheev,A Friesen,V Chudoba,A Aparin,I Bobrikov

doi:10.1051/epjconf/201817704010

V Shalaev, I Gorbunov + Show 6 more

Open Access

https://doi.org/10.1051/epjconf/201817704010

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Journal: EPJ web of conferences	Publication Date: Jan 1, 2018
Citations: 2	License type: CC BY 4.0

Affiliation: Dubna State University

Abstract

In this paper we review the results of a measurement of the forward-backward asymmetry of oppositely charged lepton pairs produced via Z/γ* boson in pp collisions during the LHC Run 1 at √s = 8 TeV with integrated luminosity 19.1 fb-1 (2012). We also present our preliminary results obtained with Monte Carlo samples at √s = 13 TeV

Highlights

The study of the lepton pairs production in the Drell-Yan processes [1], qq → γ∗/Z → l+l− (Fig. 1a), is of extreme importance: these processes allow us to verify the Standard Model (SM) predictions for the elementary particles interaction at the new energy region and to search for new physics beyond the SM [2, 3]
Where θ⋆ is the angle of lepton emission with respect to the direction of the quark momentum in the center mass of the lepton pair system (Fig. 1b), A and B – the coefficients dependent on weak isospin and a charge of fermions in the initial states
In general the value of the asymmetry given by the coefficient B depends on the values of vector and axial-vector couplings which makes B sensitive to the presence of additional contributions to the SM processes

Summary

Introduction

The study of the lepton pairs production in the Drell-Yan processes [1], qq → γ∗/Z → l+l− (Fig. 1a), is of extreme importance: these processes allow us to verify the Standard Model (SM) predictions for the elementary particles interaction at the new energy region and to search for new physics beyond the SM [2, 3]. The possible difference between the asymmetry value and the SM predictions can indicate the existence of processes beyond the SM namely new neutral gauge bosons [4], the internal structure of quarks and leptons [5], supersymmetric particles and extra dimension [6]. One of the distinguishing features of the asymmetry is its dependence on the pseudorapidity of the new neutral gauge boson predicted by various models with extended gauge sector [7]. This will allow us to choose between different. Definition of the angle θ∗ in the decay of the exchanged particle X In this oppositely paper we review the results of charged lepton pairs

CMS Experiment

AFB measurements with 8 TeV Data

Monte Carlo Studies at 13 TeV