Kavli Affiliate: Feng Yuan
| First 5 Authors: Yuxun Guo, Xiaohui Liu, Feng Yuan, ,
| Summary:
We study the forward-backward azimuthal angular correlations of hadrons in
association with multi-particle production in the central rapidity region in
proton-proton collisions at the LHC. We apply the nucleon energy-energy
correlator framework, where the spinning gluon distribution introduces a
nontrivial $cos(2phi)$ asymmetries. We will demonstrate that the fundamental
helicity structure of QCD amplitudes predicts a unique power counting rule:
$cos(2phi)$ asymmetry starts at ${O}(alpha_s^2)$ order for dijet,
${O}(alpha_s)$ for three jet and ${O}(1)$ for four (and more) jet productions.
Our results will help us to understand the long standing puzzle of nearside
ridge behavior observed in high multiplicity events of $pp$ collisions at the
LHC.
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