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The role of the underlying event in the charm-baryon enhancement observed in pp collisions at LHC energies
by Zoltan Varga, Anett Misak, Robert Vertesi
This Submission thread is now published as
Submission summary
| Authors (as registered SciPost users): | Zoltan Varga |
| Submission information | |
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| Preprint Link: | scipost_202210_00033v2 (pdf) |
| Date accepted: | 2023-07-04 |
| Date submitted: | 2022-12-02 15:22 |
| Submitted by: | Varga, Zoltan |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 51st International Symposium on Multiparticle Dynamics (ISMD2022) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Phenomenological |
Abstract
We study the enhanced production of $\Lambda_c$ charmed baryons relative to that of charmed $D^0$ mesons in proton-proton collisions at LHC energies. We simulated collision events with the enhanced color-reconnection model in PYTHIA 8 MC generator and propose measurements based on the comparative use of different event-activity classifiers to identify the source of the charmed-baryon enhancement. We demonstrate that in this enhanced color-reconnection scenario the excess production is primarily linked to the underlying event and not to the production of high-momentum jets.
Author comments upon resubmission
We agree that the results in our contribution raise a few questions. We find remark 6 especially useful and we extended the discussion on that.
We are also carrying out further studies that do not fit into these proceedings. Some of the questions will eventually be answered by high-quality data from the LHC Run3 period.
List of changes
We addressed all the comments of the Referee as follows:
1 Introduction
We added the sentences "We used the enhanced CR mode 2 as it is found to describe data the best [2]. Note that PYTHIA with the built-in CR that does not feature color junctions and does not predict any enhancement." before the last sentence.
2 Results
We changed the 2nd sentence as " the highest transverse-momentum (trigger) particle in the acceptance has pT trig > 5 GeV/c in the selected event. "
In the last paragraph we changed the 2nd sentence, added a 3rd and changed the 4th sentence as:
"However, in the coalescence regime 2 < pT < 8 GeV/c there is no difference among the near-side cone activity classes, which measure the jet region activity. (Note that an ordering with event activity is present in the higher transverse-momentum range which can be a bias as the trigger is often provided by the heavy-flavor process.) We can draw the conclusion that the mechanism beyond the enhancement in the coalescence regime is connected to the underlying event, rather than the jet region."
We fixed a typo "constraint".
We eliminated the trapped text by moving the Figure 1 to the end of the document.
Published as SciPost Phys. Proc. 15, 014 (2024)