Journal Club

Seminar Room

If you want to propose a paper, you can contact Supratim Das Bakshi (sdb AT ugr.es)

Tuesday 31st of May, 2022

dE/dx from boosted long-lived particles

Gian F. Giudice, Matthew McCullough, Daniele Teresi
At colliders massive long-lived charged particles could be revealed through their anomalously large ionisation energy loss $dE/dx$. In this paper we explore a class of scenarios in which the LLPs are particularly boosted, owing to production from the decay of a heavy parent resonance. Such scenarios give rise to unique signatures as compared to traditionally considered $dE/dx$ new-physics benchmarks. We demonstrate that this class of models, unlike traditional new-physics theories, can explain the recently reported excess of events in the $dE/dx$ search by the ATLAS collaboration without conflicting with the determination of $\beta$ from ionisation and time-of-flight measurements.
Comments: 16 pages, 8 figures; updated references and discussion
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Report number: CERN-TH-2022-078
Cite as: arXiv:2205.04473 [hep-ph]
  (or arXiv:2205.04473v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2205.04473

Submission history

From: Daniele Teresi [view email]
[v1] Mon, 9 May 2022 18:00:00 UTC (597 KB)
[v2] Wed, 18 May 2022 12:26:47 UTC (579 KB)

Presented by Pablo

 

Impact of the recent measurements of the top-quark and W-boson masses on electroweak precision fits

J. de Blas, M. Pierini, L. Reina, L. Silvestrini
We assess the impact of the very recent measurement of the top-quark mass by the CMS Collaboration on the fit of electroweak data in the Standard Model and beyond, with particular emphasis on the prediction for the mass of the W boson. We then compare this prediction with the average of the corresponding experimental measurements including the new measurement by the CDF Collaboration, and discuss its compatibility in the Standard Model, in new physics models with oblique corrections, and in the dimension-six Standard Model Effective Field Theory. Finally, we present the updated global fit to electroweak precision data in these models.
Comments: 10 pages, 9 tables, 4 figures. v2: several misprints fixed, discussion expanded, individual predictions in the SM for all observables added, figures improved
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:2204.04204 [hep-ph]
  (or arXiv:2204.04204v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.2204.04204

Submission history

From: Luca Silvestrini [view email]
[v1] Fri, 8 Apr 2022 17:58:05 UTC (171 KB)
[v2] Fri, 22 Apr 2022 16:54:58 UTC (398 KB)

Presented by Jorge