Please return to : Olaf Behnke ZEUS/F1  01a/O1.132    Tel. 3854
   or email  to   : obehnke@mail.desy.de,doris.eckstein@desy.de


   Request for a DESY Summer Student in 2013
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   Name : Roberval Walsh                     email :  roberval.walsh@desy.de    
  
   Tel  : 4849                     Room : O1.203
 
   DESY-Group/Experiment : CMS

 
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   Short description of the project the student should work on  :

In summer of 2012, the CMS and ATLAS experiments at the Large Hadron Collider (LHC) at
CERN announced the discovery of a new particle with features consistent with the 
long-sought Higgs boson. Moreover, various precise measurements of the standard model, which are important inputs for new discoveries and could also give an indirect hint of 
new physics, has been performed by all experiments. The most exact determination of
the luminosity, as the measure for the number of collisions in the recorded data,
is fundamental in probing the physics at the novel energy frontier. Another crucial 
ingredient is the monitoring of the beam conditions, especially for the precise
reconstruction of physics objects relevant for this physics analyses, e.g. b-tagging.

The DESY CMS group has led the developments and studies of the CMS fast beam conditions
monitor BCM1F that has shown astonishing performance as a beam background and luminosity
monitor during the first period of the LHC running. During the so-called long shutdown 1
(LS1) (2013/2014) BCM1F will be upgraded to cope with the harsh environment for the
planned higher energy and luminosity and smaller bunch separation. 

The summer student will participate in studying simulated data of BCM1F with parameters
for the planned conditions for the LHC and upgraded geometry after the LS1 to correlate
the BCM1F signal characteristics with possible inefficiencies and identify potential
sources of systematic effects, such as non-linearity of collision rates, affecting the
measurements of luminosity and machine-induced backgrounds. The National Analysis
Facility (NAF) at DESY and CMS grid resources will be used.


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   Physics / Computing/ Engineering  Content of the project :

Luminosity, beam background. Work in a large international collaboration Grid
computing. CMS software framework for analysis.


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  Special Qualifications expected from the student ( Computing,...) :
 
Interest and skills in programming. Some experience with c++ or python as well as
basics of Root, would be helpful


 
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  Other remarks :  



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   Supervisor(s) during the project (16/07/13 - 5/09/13) :
 
  
   Name: Roberval Walsh              Tel: 4849       email : roberval.walsh@desy.de