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# Welcome to the LHCb web

## Organisation

We are a relatively new group on the LHCb experiment, and as such we are quite small. However, we are rapidly growing, and this section will keep track of who is working on what. Please feel free to edit your section if I have missed anything out. %$\mu$%

• 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 %$\Lambda_{\rm b}^{0} \rightarrow \Lambda^0 \mu^+ \mu^-$% analysis.
• Cristina Lazerroni: Working on the %$\Lambda_{\rm b}^{0} \rightarrow \Lambda^0 \mu^+ \mu^-$% analysis. Also head of the NA62 experiment at Birmingham.
• Mark Slater: Responsible for GRID operations and GANGA developement.
• Jimmy McCarthy: 4th year PhD student. Working on the search for %$\Lambda_{b}^{0} \rightarrow \Lambda^{0} \eta^{(\prime)}$% decays. Optimising the Geant4 generator cuts used by LHCb in order to improve the performance of Monte Carlo productions. Also responsible for the XML description of the beam pipe supports.
• Pete Griffith: 3rd year PhD student. Currently working on the analysis, %$\Lambda_{b}^{0} \rightarrow J/\psi p K$% and the search for promt %$\psi(3770)$%.
• Luca Pescatore: 3rd year PhD student. Currently working on the RK* analysis and on the update of %$\Lambda_{\rm b}^{0} \rightarrow \Lambda^0 \mu^+ \mu^-$% including also 2012 data and angular analysis.
• Simone Bifani: Research Fellow in Particle Physics. Currently working on RK*.
• Nathanael Farley: 2nd year PhD student. Working on the search for %$B_{c}^{+} \rightarrow K*(892) K^{-}$%
• Tim Williams: 1st year student.

We currently have regular meetings every Wednesday, 09:00 in the West 229 meeting room

## 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.

## Simulations

These pages are aimed at giving a brief introduction to the tools needed to run simulations for your technical work. 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 Gauss? and Boole to perform simulations.
• Using Panoramix? to visualize the detector.
• Writing XML for the detector Descriptions?
• Making a new release of Geant4? for LHCb.

## Working Locally

We have local copies of the LHCb software installed on eprexb. The advanage to working locally is that it is a lot quicker than trying to run emacs etc. over the network. The disadvatage is that every project has to be installed before it can be used, and you can only use the installed version. When a new version is released by LHCb, it needs to be installed locally before it can be used.

The current project which are currently available are:

• Bender v21r2, v22r3
• Geant4 v94r2p2, v94r2p4, v94r2p6, v95r2, v95r2p4g1 v94r2p5, v95r2p5g1, v95r2p5g3
• Gauss v41r1, v41r4, v42r1, v43r3, v44r4, v45r3, v46r1, v46r2, v46r2p1
• Boole v25r1, v26r6
• Moore v14r8p1, v20r3p1
• Brunel v44r8
• DaVinci? v32r2, v32r2p1, v33r1 , v46r3
• Panoramix v21r3, v22r0
• Erasmus v8r1, v9r0

All the software is stored in:

/home/lhsoft

We also have a directory in which to store any large data files we use. This can be found in:

/home/lhdata1

Everybody in the group has write access to both areas, so feel free to add your own data, or install software. These areas are not backed up very regularly, so it is a good idea to keep a copy of all the data files on castor as well.

To use the LHCb software locally, you need to first setup and LHCb environment with the login scripts available. You can then setup a project in the same way you would on lxplus.

source /home/lhsoft/LbLogin.sh
SetupProject davinci

Installing a new version of the software is easy to do:

export MYSITEROOT=/home/lhsoft/
cd \$MYSITEROOT
python install_project.py -b DaVinci v33r0

And then please update the list above so we can keep track of which projects are available.