Enhanced deuteron coalescence probability in jets
- The transverse-momentum (pT) spectra and coalescence parameters B2 of (anti)deuterons are measured in pp collisions at s√=13 TeV in and out of jets. In this measurement, the direction of the leading particle with the highest pT in the event (pleadT>5 GeV/c) is used as an approximation for the jet axis. The event is consequently divided into three azimuthal regions and the jet signal is obtained as the difference between the Toward region, that contains jet fragmentation products in addition to the underlying event (UE), and the Transverse region, which is dominated by the UE. The coalescence parameter in the jet is found to be approximately a factor of 10 larger than that in the underlying event. This experimental observation is consistent with the coalescence picture and can be attributed to the smaller average phase-space distance between nucleons inside the jet cone as compared to the underlying event. The results presented in this Letter are compared to predictions from a simple nucleon coalescence model, where the phase space distributions of nucleons are generated using PYTHIA 8 with the Monash 2013 tuning, and to predictions from a deuteron production model based on ordinary nuclear reactions with parametrized energy-dependent cross sections tuned on data. The latter model is implemented in PYTHIA 8.3. Both models reproduce the observed large difference between in-jet and out-of-jet coalescence parameters.
| URN: | urn:nbn:de:hebis:30:3-799999 |
|---|---|
| URL: | https://arxiv.org/abs/2211.15204v1 |
| DOI: | https://doi.org/10.48550/arXiv.2211.15204 |
| ArXiv Id: | http://arxiv.org/abs/2211.15204v1 |
| Parent Title (German): | arXiv |
| Series (Serial Number): | CERN Report (CERN-EP-2022-264) |
| Publisher: | arXiv |
| Document Type: | Preprint |
| Language: | English |
| Date of Publication (online): | 2022/11/28 |
| Date of first Publication: | 2022/11/28 |
| Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
| Creating Corporation: | ALICE (Körperschaft) |
| Release Date: | 2023/12/07 |
| Issue: | 2211.15204 Version 1 |
| Edition: | Version 1 |
| Page Number: | 11 |
| HeBIS-PPN: | 514670762 |
| Institutes: | Physik / Physik |
| Informatik und Mathematik / Informatik | |
| Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS) | |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Sammlungen: | Universitätspublikationen |
| Licence (German): |  Creative Commons - Namensnennung 4.0 |
