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Welcome to the LHCb web

Organisation

We joined the LHCb experiment early in 2011, after first data taking so our responsibilities are for core software and not experimental hardware. This section will keep track of who is working on what. Please feel free to edit your section if I have missed anything out.

  • Nigel Watson: Head of the LHCb group. Responsible for implementing new versions of Geant4 within the LHCb framework, and testing performance against previous versions. Working on the rare decay Λb → Λ μ+ μ- analysis.
  • Cristina Lazzeroni: Worked on the rare decay K → piμ+μ- analysis. Also leads the UK effort on the NA62 experiment.
  • Simone Bifani: Research Fellow in Particle Physics. Currently working on electroweak penguin decays and electroweak physics studies.
  • Mark Slater: Responsible for GRID operations and GANGA development.
  • Jonathan Plews: Final year student, working on Drell-Yan to cross sections.
  • Naomi Cooke: 4th year student, working on production mechanisms of quarkonia with Run 2 data.
  • Paul Swallow: 3rd year student, studying Rare Decays with a focus on rare Λb decays, attempting to further explore the pattern of B anomalies observed at LHCb during Run 1 and 2 through a Lepton Flavour Violation search of Λb → Λ e± μ, which directly probes new physics, and a Lepton Flavour Universality ratio of R(Λ), which is one of the few that use baryons and would give the first observation of the channel Λb → Λ e+ e-.
  • Dan Thompson: 2nd year student, working on lepton flavour violation in Λb → Λ(1520) μ± decays.

Alumni

  • Jimmy McCarthy: (thesis) Carried out the search for Λb → Λ η(') decays, JHEP 1509 (2015) 006. Optimised the Geant4 generator cuts used by LHCb in order to improve the performance of Monte Carlo productions, responsible for the XML description of the beam pipe supports.
  • Pete Griffith: (thesis) Worked on analysis into Λb → pKμ+μ- , and EM benchmarking tests in Geant4.
  • Luca Pescatore: (thesis) Worked on RK* analysis, and analysis into the rare decay Λb → Λμ+μ- from Run I data, including branching fraction and angular analysis ( JHEP 1506 (2015) 115), also set up hadronic and material benchmarking tests for Geant4.
  • Tim Williams: (thesis) Worked on search for Λb → pK; η(') decay, EM benchmarking for Geant4.
  • Nathanael Farley: Worked on the search for B+c → K*0(892) K+ , contributing to B+c → ϕ K+ at Run 1, performed ageing tests for RICH and contributed to the development of LHCbPR.
  • Georgios Chatzikonstantinidis: thesis) Worked on Λb → Λμ+μ (run I and II) angular analysis with moments; previously at Nikhef, masters on study of CPT and Lorentz-invariance violation in B s mixing
  • Kristian Zarebski: (thesis) Worked on searches for K → πμ+μ- at Run 2, B+c → ϕ K+ at Run 1, and maintained the Radiation Length and Hadronic Multiplicity & Cross Section Tests for Sim10, as well as created the Gamma to DiLepton Conversion Test for validation via LHCbPR.
  • Sasha Mazurov: Former Birmingham colleague. Analysis included Χb(3P), Χb1,2(1P), also worked on developing the new performance and regression testing framework LHCbPR for simulation and more general use.
  • Tonino Sergi: worked on K → piμ+μ- analysis, currently coordinating integration tests of elementary module for RICH upgrade, developing firmware for irradiation tests of FE board FPGA, carrying out PMT ageing tests, and responsible for RICH aspects of firmware on the TELL40 boards.
  • Dmitry Popov: Maintenance and development of the LHCbPR framework for LHCb software performance monitoring.
  • Phil Ilten: working on Dark Photon searches, HLT trigger and Pythia simulations for LHCb.
  • Ryan Calladine: 4th year student, working on RK* measurement in Run 2 and Muon Multiple Scattering benchmarking tests for Sim10

Local Meetings

We currently have regular meetings every Monday, 09:00 in a hybrid format.

For New Students

Welcome to Birmingham. Click here for information to get yourself started.

Analyses & Other Activities

A full summary of publications with contributions from LHCb at Birmingham can be found on CDS

Software repositories

Ongoing and Past Analyses

Hardware Tests

Paper Reviews

Tips & Tricks

A list of tips and tricks discovered during the analysis journey, please DO add new entries if you come across anything that could be beneficial to others!

Tips & Tricks

Physics Analysis

These pages are aimed at giving a brief introduction to the tools needed for a physics analysis. It is supposed to be guide only to jog your memory and give some example code. Please refer to the manuals and tutorials for a full description of how everything works.

  • Using DaVinci to fill an nTuple from Data or Monte Carlo.
  • Using ROOT? to analyse the nTuple.
  • Using the TMVA tool to refine your selection.
  • Using RooFit? to perform fits to Data.

Also a very good set of tutorials are available via the LHCb Starter and Impact kits held at CERN/Online every year:

  • Analysis Esssentials: An excellent introduction to python followed by advanced tutorials on particle physics applications including multivariate classifiers, re-weighting, likelihood inference, fitting, sPlot followed by an introduction to UNIX and Git.
  • LHCb Starter Kit: An introduction to the LHCb experiment and the necessary software to start an analysis. Can be followed independently but it is recommended to join the organised "Starterkit Sessions" usually within the last few months of each year.
  • LHCb Impact Kit: A follow up to the starterkit, explaining some more advanced techniques and LHCb software that many proponents will require at some point in the course of a PhD? . These are often run in late spring each year, recommended for first/second year PhD? or anyone that is interested!

Simulations

Birmingham is responsible for the development and maintenance of software tests used to monitor the progress and regression of LHCb simulation software. These tests are written to run in either standalone Geant4 or Gauss, the main LHCb simulation project which combines particle generation using frameworks such as Pythia, with detector response as modelled by Geant4. The pages below outline information regarding the tests under our responsibility as well as give an overview of how to execute them. The software testing and comparison itself is hosted on LHCbPR2? , which displays the information relating to the running of each test on different nightly slots containing various builds of Gauss/LHCb-Geant4 in development. If your test is not displayed for a date where it is expected to have run, this could be due to a failed build of the main software, as such it is recommended you keep an eye on the nightly build results.

LHCb Nightlies Website

LHCbPR and Test Development

Summary of Tests & Allocations

Validation Studies

Creating a New DecFile

Useful Information

Working Locally

Cern Openstack

CernVM can be used to access the LHCb software locally. The advantage to working locally is that it is a lot quicker than trying to run emacs etc. over the network.

Useful Links

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