Speaker
Description
The transverse region of di-hadron correlations is known to be
very sensitive to the underlying event (UE), and initial- and
final-state radiation (ISR and FSR). In pp collisions, particle
production in the transverse azimuthal region, with respect to
the leading particle, reaches a plateau for $p^{leading}_{T}>$ 5
GeV/c. In this contribution, a study of the multiplicity
distributions in the plateau region for pp collisions at
$\sqrt{s}$ = 0.9, 2.76, 5.02, 7 and 13 TeV with ALICE is
reported within $|\eta|<$ 0.8. This region is further divided
into trans-max and trans-min regions which are sensitive to ISR,
FSR and UE, respectively. The UE component is found to increase
like a power of the center-of-mass energy, resembling the
center-of-mass energy dependence of the parameter which
regulates multiparton interactions in event generators like
Pythia. KNO-like scaling properties of the multiplicity
distributions are also reported. Measurements are compared with
general-purpose Monte Carlo generators.
