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Department of Physics

The Cavendish Laboratory
 
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This list is intended to include all research talks taking place in the Department of Physics.
Updated: 53 min 4 sec ago

Wed 20 Oct 11:15: Unconventional superconductivity and quadrupolar-density- wave phases in the locally noncentrosymmetric compound CeRh2As2

Fri, 15/10/2021 - 14:31
Unconventional superconductivity and quadrupolar-density- wave phases in the locally noncentrosymmetric compound CeRh2As2

S. Khim et al. Science 373, 1012 (2021) D. Hafner et al. arXiv:2108.06267 (2021)

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Fri 15 Oct 16:00: The Geometric SMEFT description of curved Higgs Field Space(s) - Michael Trott

Wed, 13/10/2021 - 08:29
The Geometric SMEFT description of curved Higgs Field Space(s) - Michael Trott

The seminar will take place in the Potter Room at DAMPT and will be broadcast via Zoom here.

Abstract: In recent years, the effective field theory approach to the Standard Model, the SMEFT , has been used to study LHC data with ever increasing theoretical precision and sophistication. However, the complexity of this theory lead to several barriers to substantial theoretical progress. In particular, the explosion in the number of parameters in the SMEFT as a function of operator mass dimension, and the technical challenge or reformulating SM predictions consistently into the SMEFT were very serious problems, that called into question the possible success and value of the SMEFT physics program over the long term. I will discuss how these challenges have been overcome. The key point leading to this advance is the understanding that the projection of curved scalar field spaces generated by the Higgs onto a naive flat field space understanding implicitly embedded into the usual SMEFT Lagrangian and approach was the root cause of many problems, technical challenges and confusions. Many outstanding issues have now been addressed and immediately overcome by reformulating the SMEFT noting its curved scalar field space(s) – in the Geometric SMEFT . Some examples of the benefits of this approach will be presented, and explained.

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Fri 22 Oct 16:00: Searches for new interactions within the SMEFT framework at the LHC

Tue, 12/10/2021 - 10:41
Searches for new interactions within the SMEFT framework at the LHC

The existence of Beyond Standard Model (BSM) physics is firmly suggested by both experimental observations (Dark Matter, neutrino masses) and theoretical arguments. In the hypothesis that the scale of new physics is considerably higher than the energies probed at colliders, we can parametrise modified interactions induced by BSM effects among SM particles in a model-independent framework, the Standard Model Effective Field Theory (SMEFT). Searches for indirect evidence of new physics are conceptually different from the direct ones that have characterised the first part of the LHC program, and both experimental and phenomenological studies are needed in order to maximise the chances of uncovering a BSM signal. A characteristic feature of modified interactions is that they can induce unitarity violating effects which can be exploited to gain sensitivity. In this direction, a study of the top quark electroweak sector will be presented, focusing on 2 → 2 scatterings and their embeddings in physical processes at colliders. One of the key features of the SMEFT is that deviations from the SM interactions are correlated and global interpretations are therefore of fundamental importance. A combined interpretation of the Higgs, top and diboson data from the LHC will be presented and the interplay between the various datasets discussed.

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Fri 15 Oct 16:00: The Geometric SMEFT description of curved Higgs Field Space(s) - Michael Trott

Mon, 11/10/2021 - 10:01
The Geometric SMEFT description of curved Higgs Field Space(s) - Michael Trott

The seminar will take place in the Potter Room at DAMPT and will be broadcast via Zoom here.

Abstract: In recent years, the effective field theory approach to the Standard Model, the SMEFT , has been used to study LHC data with ever increasing theoretical precision and sophistication. However, the complexity of this theory lead to several barriers to substantial theoretical progress. In particular, the explosion in the number of parameters in the SMEFT as a function of operator mass dimension, and the technical challenge or reformulating SM predictions consistently into the SMEFT were very serious problems, that called into question the possible success and value of the SMEFT physics program over the long term. I will discuss how these challenges have been overcome. The key point leading to this advance is the understanding that the projection of curved scalar field spaces generated by the Higgs onto a naive flat field space understanding implicitly embedded into the usual SMEFT Lagrangian and approach was the root cause of many problems, technical challenges and confusions. Many outstanding issues have now been addressed and immediately overcome by reformulating the SMEFT noting its curved scalar field space(s) – in the Geometric SMEFT . Some examples of the benefits of this approach will be presented, and explained.

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Tue 23 Nov 16:00: TBA

Fri, 08/10/2021 - 12:18
TBA

Abstract not available

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Tue 16 Nov 16:00: TBA

Fri, 08/10/2021 - 11:55
TBA

Abstract not available

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Tue 02 Nov 16:00: BSM physics with b-quarks

Fri, 08/10/2021 - 11:53
BSM physics with b-quarks

Abstract not available

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Tue 23 Nov 16:00: TBA

Fri, 08/10/2021 - 11:52
TBA

Abstract not available

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Tue 09 Nov 16:00: FASER: Commissioning of a not-so-large LHC experiment in search for new physics in far corner

Fri, 08/10/2021 - 11:52
FASER: Commissioning of a not-so-large LHC experiment in search for new physics in far corner

FASER is a newly installed experiment at the LHC designed to look for new forward long-lived particles, produced in proton collisions at Point 1, and decaying several hundred meters downstream. The detector components were commissioned in a surface lab in 2020 and the full detector was installed in the tunnel in March 2021. The experiment is now set to go live at the start of LHC Run 3 and collect data 24 hours a day for several years. During data taking there will be no control room with dedicated shifters onsite to watch over the run continuously. Thus the TDAQ system, monitoring and automatic alerts have been tirelessly stress-tested since installation while collecting on the order of 100 million noise and cosmic-ray events. During the seminar, I will explain what FASER aims to do as well as what it took to fully commission this small detector at a large collider, the custom software infrastructure we built and the unexpected challenges we faced.

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Fri 26 Nov 16:00: D to K semileptonic decays on the lattice

Thu, 07/10/2021 - 14:11
D to K semileptonic decays on the lattice

The seminar will take place via Zoom here.

Abstract:

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Fri 15 Oct 16:00: TBA - Michael Trott

Thu, 07/10/2021 - 12:45
TBA - Michael Trott

TBA

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Fri 08 Oct 16:00: D to K semileptonic decays on the lattice

Thu, 07/10/2021 - 12:44
D to K semileptonic decays on the lattice

The seminar will take place via Zoom here.

Abstract:

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Fri 22 Oct 16:00: TBA - Luca Mantani

Thu, 07/10/2021 - 12:42
TBA - Luca Mantani

Abstract not available

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Fri 29 Oct 16:00: TBA - Bernhard Mistlberger

Thu, 07/10/2021 - 12:42
TBA - Bernhard Mistlberger

Abstract not available

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Fri 05 Nov 16:00: TBA - Stefania Gori

Thu, 07/10/2021 - 12:42
TBA - Stefania Gori

Abstract not available

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Fri 12 Nov 16:00: TBA - Peter Stangl

Thu, 07/10/2021 - 12:42
TBA - Peter Stangl

Abstract not available

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Fri 19 Nov 16:00: TBA - Andreas Vogt

Thu, 07/10/2021 - 12:42
TBA - Andreas Vogt

Abstract not available

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Tue 12 Oct 16:00: Electroweak measurements and measurement of the W boson mass with the LHCb detector

Wed, 06/10/2021 - 14:48
Electroweak measurements and measurement of the W boson mass with the LHCb detector

The LHCb detector offers unique opportunities to explore QCD and EW physics, owing to its high precision coverage of the forward region at the LHC . I will report on LHCb measurements using W and Z bosons. I will discuss in detail the recent measurement of the W boson mass (mW) at LHCb. LHCb has a critical role in LHC measurements of mW, since important theoretical uncertainties on mW are known to be anti-correlated between LHCb and the other LHC experiments: LHCb results are expected to significantly improve the LHC -wide mW average. I will also set out plans in this programme for the next decade and beyond. LHCb is currently being upgraded for higher intensity proton collisions, with a further upgrade proposed for around 2030.

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