Month: Marzec 2023

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 24 marca (piątek) o godzinie 10:15, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Searching for dark matter with liquid-argon detectors”

Referuje: mgr Marek Walczak (IFD UW)

The nature of dark matter remains unknown and its origin is currently one of the most important questions in physics. In particular direct searches for WIMP dark matter particle interactions with ordinary matter are carried out with large detectors located in underground laboratories to suppress the background of cosmic rays. One of the currently most promising detection technologies is based on the use of a large mass of liquid argon or xenon as a target in the detector.

In this talk, I will discuss the status and plans for dark matter searches with detectors based on liquid argon. I will present the currently operating DEAP-3600 experiment (at SNOLAB, Canada) and introduce the DarkSide-20k detector (under construction at the Gran Sasso laboratory, Italy) and in particular the design of its neutron veto.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Jan Królikowski
prof. dr hab. Aleksander Filip Żarneck

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 17 marca (piątek) o godzinie 10:15, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„Theoretical motivations and experimental signals for a second resonance of the Higgs field”

Referuje: prof. Maurizio Consoli, INFN, Sezione di Catania, Italy

Theoretical arguments and lattice simulations suggest that, beside the known resonance of mass m_h= 125 GeV, defined by its quadratic shape, the effective potential of the Higgs field could exhibit a second, much heavier mass scale M_H = 690 +/- 30 GeV associated with the zero-point energy which determines its depth. In spite of its large mass, however, the heavier state would couple to longitudinal W’s with the same typical strength as the low-mass state at 125 GeV and thus represent a relatively narrow resonance mainly produced at LHC by gluon-gluon fusion. After summarizing the general aspects, I will consider 4 samples of LHC data (2 from ATLAS and 2 from CMS) which suggest a new resonance with a combined mass value of 691(10) GeV. Since the considered measurements have a negligible correlation and since, when comparing with a definite theoretical prediction, local excesses are not downgraded by the so called look-elsewhere effect, the cumulated statistical significance is now substantial. The issue of the second resonance could thus definitely be settled by just adding one or two crucial, missing samples of RUN2 data.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Jan Królikowski
prof. dr hab. Aleksander Filip Żarneck

SEMINARIUM FIZYKI WIELKICH ENERGII

Dnia 10 marca (piątek) o godzinie 10:15, w sali B2.38 odbędzie się seminarium, na którym zostanie wygłoszony referat pt.:

„LHC searches beyond simplified models”

Referuje: dr hab. Krzysztof Rolbiecki (IFT UW)

In this talk I will discuss a concept of simplified models which is used for interpretation of searches for new physics at the LHC. I will discuss limitations of this approach and the need for reinterpretation of results. Then I will introduce several computer programs that are used to reinterpret ATLAS and CMS searches beyond Standard Model physics. Finally I will show recent examples of reinterpretation efforts from the theory community.

Serdecznie zapraszamy

dr hab. Katarzyna Grzelak
prof. dr hab. Jan Królikowski
prof. dr hab. Aleksander Filip Żarneck