Spåtind 2023 - Nordic Conference on Particle Physics

Session

Contributed Talks V

6 Jan 2023, 17:00

Fefor Høifjellshotell - Norge

Conveners

Contributed Talks V

• Bernhard Meirose (Stockholms Universitet + Lunds Universitet)
• Bernhard Meirose (Stockholms Universitet + Lunds Universitet)

10. Supermassive black holes as detectors for ultralight bosons

Yifan Chen (Niels Bohr International Academy)

06/01/2023, 17:00

Axions

Contributed Talk

Ultralight bosons behave like coherent waves when the occupation number is large enough. If they are coupled to the Standard Model sector of the particle physics, such an oscillating background can induce a tiny signal. Near a fast rotating black hole, ultralight bosons within one order of the mass window can accumulate through superradiance with a large density expected. If linearly polarized...

18. Effective Field Theory interpretation of the search for Higgs boson pair production in the two bottom quarks plus two photons final state with the ATLAS detector

Laura Pereira Sanchez (Stockholm University (SE))

06/01/2023, 17:20

Higgs physics

Contributed Talk

Measuring Higgs pair production will give us information about the Higgs self coupling, which is key to determine the shape of the Higgs potential at higher order O(3).

The leading production mode is gluon gluon fusion, with a cross section of 31.05 fb at a centre of mass energy of 13 TeV. Given the small cross section, Higgs pair production has not yet been observed. However, despite...

15. SMARTHEP network: Studies on online vs. offline jet energy corrections at CMS

Henning Kirschenmann (Helsinki Institute of Physics (FI)), Patin Inkaew (Helsinki Institute of Physics (FI))

06/01/2023, 17:40

ML and AI for physics

Contributed Talk

SMARTHEP is an Innovative Training Network, bringing together researchers from all major four LHC collaborations and partners from industry, all working on real-time analysis. In this contribution, I will present work on intertwining the online and offline calibration of jets at CMS. We investigate the transverse momentum response between high level trigger (HLT) and several types of offline...

28. Constraints on spin-0 dark matter mediators and invisible Higgs decays using ATLAS 13 TeV pp collision data with two top quarks and missing transverse momentum in the final state

Xuanhong Lou (Stockholm University (SE))

06/01/2023, 18:00

BSM physics

Contributed Talk

This paper presents a statistical combination of searches targeting final states with two top quarks and invisible particles, characterised by the presence
of zero, one or two leptons, at least one jet originating from a b-quark and missing transverse momentum.
The analyses are searches for phenomena beyond the Standard Model consistent with the direct production of dark matter in pp...

17. Top quark mass measurement in lepton and jets final state at the CMS experiment

Mikael Myllymaki (Helsinki Institute of Physics (FI))

06/01/2023, 18:20

Precision measurements

Contributed Talk

Our analysis is a direct top quark mass measurement where the mass is extracted from the reconstruction of the top quark decay products.The analysis operates on a lepton and jets final state in top quark pair event topology. Our analysis is based on a binned profile likelihood method which has been introduced to the top quark mass measurements at CMS during the LHC Run II data taking...

32. Searches for baryon number violation via neutron conversions at the European Spallation Source

Sze Chun Yiu (Stockholm University (SE))

06/01/2023, 18:40

BSM physics

Contributed Talk

The observation of neutrons converting to antineutrons and/or sterile neutrons would demonstrate Baryon Number Violation (BNV) for the first time. BNV is an essential condition needed to produce the matter/anti-matter asymmetry in the universe and appears in a number of theories beyond the Standard Model. The existence of sterile neutrons would address the issue of a possible dark sector of...