Combined higher-order QCD and EW corrections for high-energy V+jets production at the LHC

Research Group: 
Particle Physics Research Centre
Number of Students: 
1
Length of Study in Years: 
4
Full-time Project: 
Yes
Funding: 
Other
Project Description: 

With increasing integrated luminosity and higher collision energies at the LHC, searches for new particles start to exploit highly energetic signatures. Many well-motivated theories Beyond the Standard Model involve signatures characterized by final states with high transverse momentum leptons and/or significant missing transverse energy accompanied by highly energetic jets These signatures are especially representative of new physics models involving Dark Matter.
The purely Standard-Model associated production of Electro-Weak gauge bosons with jets constitutes a dominant background source for these new processes, with two challenging types of signatures: boosted (Electro-Weak boson recoiling against highly energetic jets) and collinear (emission of Electro-Weak bosons parallel to the quark emitter in di-jet events) signatures. In these kinematic regimes the masses of the Electro-Weak gauge bosons are small in comparison to the energy scale and large higher order virtual and real Electro-Weak corrections are expected, which do not cancel each other, unlike in QCD.
A precise description of these processes is crucial to search for new physics on top of the gauge-boson +jets background. Its theoretical description has progressed a lot in the past years. At fixed order, exclusive production of gauge bosons and jets is described at Next-to-Leading Order QCD/Electro-Weak in a factorized approach. For particle-level event generators though, only approximate solutions are presently implemented. Hence a step-change is required in the emulation of such processes. In achieving this, many challenges need to be faced. Could the factorisation of mixed Electro-Weak and QCD correction break down? How do we account properly for Next-to-Leading Order Electro-Weak (or even QED) effects in the proton structure? Will it be possible to implement proper QCD+Electro-Weak matching and merging in parton shower generators? The project will address all this.

Please apply online using the following page: https://www.qmul.ac.uk/postgraduate/research/subjects/physics.html
email for enquiries: u.blumenschein@qmul.ac.uk


Requirements: 
The studentship will be organised as follows.
1. The student will receive UK/EU fees plus a yearly stipend and London weighting when based at QMUL.
2. In addition, a Research Training Support Grant (RTSG) will be awarded for travel and subsistence within and outside the Institute.
3. The main purpose of this studentship is to provide an opportunity to carry out research to PhD level on topics in particle physics phenomenology in the area of collider physics. The student will become a full or associate member of ATLAS working within the LHC EW Working Group.
4. Training and research will be part of a novel PhD programme developed in the context of the NExT Institute. This will involve mixed (theoretical and experimental) training and joint/shared supervision, networking across all nodes, video-linked delivery of seminars and graduate lectures as well as an annual residential workshop plus regular scientific meetings. Attendance to the London Intercollegiate Postgraduate Course in Elementary Particle Physics is also foreseen.
5. The student will also undergo training on data intensive science via the DISCnet programme. The DISCnet training additionally involves two 3-months placements in local data science industrial partners or non-profit organisations.
6. The student will formally be enrolled with both QMUL and the University of Southampton, thus he/she will need to satisfy the entry requirements of and apply to both universities by adopting the procedures described at the two following webpages:
http://pprc.qmul.ac.uk/postgraduate/phd-programme/
http://www.hep.phys.soton.ac.uk/opportunities/
7. The ultimate deadline for both applications is 30 June 2018 but early submissions are strongly encouraged and interviews will be arranged straight after so that the position will be filled as soon as a suitable candidate will be identified on a first come first serve basis.
8. The student will tentatively spend the first half of the studentship at Southampton and the second half at QMUL but this will be defined in due course.
9. The studentship will start at the end of September 2018 and stop at the end of September 2022. The student will be issued with a joint PhD award from the two institutions involved. Financial support will be provided by both QMUL and the University of Southampton.
SPA Academics: 
Ulla Blumenschein