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Aidan Wiederhold

I am a PhD student in the LHCb Group of the Warwick Elementary Particle Physics Group. Before my PhD I studied here as an undergraduate student and acquired a First Class BSc MMathPhys.

Postgraduate Research

One of the goals of modern particle physics is to determine why the Universe consists primarily of matter rather than equal amounts of matter and antimatter. One phenomenon that contributes to this is CP-violation in quarks, this can be studied by measuring the Unitarity Triangle defined by elements of the CKM matrix.

The unitarity triangle defined by CKM matrix elements that is used to measure Gamma.

The angle gamma has negligible theoretical uncertainty and can be used as a benchmark of the Standard Model to probe for effects of new physics. It can be measured using B-meson decay data from the LHCb Experiment of the LHC at CERN.

The focus of my research is to measure gamma using a double Dalitz analysis of Bd to DK+pi- decays. This is a new measurement and will utilise the full Run 1 and Run 2 dataset of LHCb, it will increase the sensitivity of LHCb's gamma combination and take us one step closer to a sub 1 degree measurement of gamma. It could enhance/resolve tension between measurements of gamma using Bu or Bd decays, an enhancement of this tension may provide a sign of previously unknown physics. Similarly, increased sensitivity of the LHCb gamma combination could enhance the tension with indirect measurements of gamma, another possible way of revealing unknown physics.

Undergraduate Research

During the final year of my undergraduate degree I worked with Dr Matt Kenzie and Nick Latham on a study of combinations of Beauty and Charm data from LHCb and their sensitivity to gamma. This combined the LHCb BPGGSZ, Double Dalitz and Charm Bin-Flip analyses from LHCb and the strong-phase measurements from the CLEO-c and BES-III experiments to estimate how each of these analyses affected sensitivity to gamma and Charm parameters as the LHCb dataset grew with subsequent runs of the LHC.

One particular finding was that the double Dalitz analysis would significantly improve the sensitivity to gamma, with the magnitude of improvement growing with each run of the LHC. This motivates the use of the analysis now so that its benefits can be utilised as soon as possible.

In addition to my final year project I also spent two summers as a Summer Research Student. In 2018 I worked with Professor Paul Harrison at Warwick on parameterising the Quark Mass Matrices and in 2019 I worked with Dr Bora Isildak at CERN on an artificial neural network method for histogram deconvolution of particle physics data.


For the academic year 2021-2022 I will be working as a first-year physics lab demonstrator.

Additional Responsibilities

I am one of the Analysis Productions liaisons for the B2OC working group in the LHCb Collaboration. I am responsible for approving the productions of other members of the group and for helping them with any problems they might have during the preparation/running of their productions. I have also recently been made the Deputy Operations Manager of Analysis Productions so I am responsible for reviewing merge requests to the relevant repositories and ensuring liaisons respond to their working group requests in a timely manner.


Dr Matt Kenzie

Contact Details:

Office: P4.50 (Department of Physics, University of Warwick)