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SUMMARY:Determination of supersymmetric masses using kinematical fits at t
 he LHC - Dr. Christian Sander (Hamburg)
DTSTART:20100225T160000Z
DTEND:20100225T170000Z
UID:TALK22206@talks.cam.ac.uk
CONTACT:Kazuki Sakurai
DESCRIPTION:If physics beyond the Standard Model is discovered at the LHC\
 , the next challenge will be the identification of the underlying theory a
 nd the determination of its fundamental parameters. Observables which are 
 sensitive to masses or mass differences are of special interest\, and ther
 e are various approaches to define them. An overview of possible observabl
 es will be given.\n\nIn R-parity conserving SUSY models a typical event to
 pology at colliders will be the cascade decay of the two produced SUSY par
 ticles. Depending on the SUSY model cascade decays via SUSY particles of e
 qual or similar masses at one particular position in the decay chains migh
 t occur with a high abundance. For the kinematics of all events the few ma
 sses of the involved SUSY particles are unknowns. The momentum components 
 of the LSPs are also unknown parameters but unique for each event. If the 
 cascades are sufficiently long\, e.g. enough mass constraints are availabl
 e\, then the problem can be over constrained by making use of a large numb
 er of events. If an efficient selection of these events is possible one ca
 n utilize kinematic fits to determine the masses of the involved SUSY part
 icles. In this talk techniques are presented for the solution of this prob
 lem. Additionally the problem of the huge combinatorial background is addr
 essed.
LOCATION:MR13\, CMS
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