Speaker
Description
A jet is a spray of collimated hadrons originated in the fragmentation of an energetic parton. The cross section measurement provides a good test for pQCD calculations. Jet $p_{\rm T}$ spectrum measurement in pp collisions sets a reference for jet quenching study in nucleus-nucleus collisions. In addition, high multiplicity pp collisions show similar collective behavior as found in heavy-ion collisions with comparable event activities, such as long-range correlations or the $v_{n}$ coefficients. In pp collisions, these effects may be caused by multiple-parton interactions or other QCD effects, therefore, the measurements in different multiplicity intervals will provide insights to understand the properties of small interacting system.
In this contribution, we will present charged jet cross section measurement in pp collisions at $\sqrt{s}=$ 13 TeV with the high statistics collected by ALICE. The jet cross section ratio for various jet resolution parameters will be also shown. Such kind of cross section ratio is sensitive to the transverse energy profile of the jets. In particular, we will present the charged particle jet production in different multiplicity intervals, which will provide important input for understanding the correlations between the hard process and event activities in small colliding systems.
