Abstract
Abstract We present the measurements of particle pair yields per trigger particle obtained from di-hadron azimuthal correlations in pp collisions at $ \sqrt{s} $ = 0.9, 2.76, and 7 TeV recorded with the ALICE detector. The yields are studied as a function of the charged particle multiplicity. Taken together with the single particle yields the pair yields provide information about parton fragmentation at low transverse momenta, as well as on the contribution of multiple parton interactions to particle production. Data are compared to calculations using the PYTHIA6, PYTHIA8, and PHOJET event generators.
Highlights
The full final state of pp collisions cannot be calculated in perturbative QCD, pQCD-inspired models based on multiple parton interactions provide a consistent way to describe high multiplicity pp collisions, and have been implemented in recent Monte Carlo (MC) generators like PYTHIA6 [7, 11], PYTHIA8 [12], PHOJET [13] and HERWIG [14]
We compare our results for pp collisions at s = 0.9, 2.76 and 7 TeV among each other and to the outcome of Monte Carlo simulations on generator level with different PYTHIA6 tunes (Perugia-0 and Perugia2011 [16]), PYTHIA8 and PHOJET
We have studied the pair-yields per trigger in two-particle √azimuthal correlations between charged trigger and associated particles in pp collisions at s = 0.9, 2.76, and 7 TeV
Summary
If multiple semi-hard scatterings play a dominant role in the production of high multiplicity events, this should lead to distinct experimentally observable effects The search for these is the aim of the present analysis of pp collisions recorded with the ALICE detector at the LHC. The mean number of trigger particles per event and the correlated pair-yield per trigger are measured and combined in a way that they can provide information about the number of semi-hard scatterings in the event of a given charged particle multiplicity as well as the fragmentation properties of low-pT partons biased by the multiplicity selection. We have chosen this set of generators and tunes since they have been already compared to previous ALICE measurements based on azimuthal correlations: the underlying event [17] and transverse sphericity [18]; ref. [17] contains a short description of them
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
