CBM Muon Detector (MUCH)

CBM Muon Detector (MUCH)

Welcome to the Muon System web used by CbmMuonGroup^?: Anna Kiseleva, Iouri Vassiliev, Victor Baublis, Ivan Kisel, Sergey Gorbunov, Premomoy Ghosh and Subhasis Chattopadhyay.

Physics

The measurements of $J/\psi$ -> $\mu^{+}$$\mu^{-}$ and low mass vector mesons decay $\rho^{0}$ -> $\mu^{+}$$\mu^{-}$ , $\omega^{0}$ -> $\mu^{+}$$\mu^{-}$ and $\phi^{0}$ -> $\mu^{+}$$\mu^{-}$ in Au + Au collisions at 25 AGeV have been proposed, as a key probe to indication of:

in-medium modification of hadrons
chiral symmetry restoration
deconfinement

at high $\rho_{b}$ .

MUCH layout

This measurements would require a sophisticated muon detector located after the STS. The current design of the muon system consists of 16 detector layers with 100 $\mu$ m position resolution and 5 absorber layers made of tungsten, iron and carbon of variable thickness. The structure of the muon detector is following: one sensitive layer is in front of the first absorber, three sensitive layers are between each two absorbers and three — behind last absorber.

CBM Much detector:

The vector meson decays were simulated with the PLUTO generator assuming a thermal source with a temperature of 130 MeV. The multiplicities of the signals for central Au + Au collisions at 25 AGeV beam energy were taken from the HSD transport code. The background, consisting mainly of decays of charged pions and kaons, was calculated with the UrQMD event generator for the same system. Both signal and background are transported through the detector setup with cbmroot v.APR05 employing GEANT3. The L1 tracking procedure has been used for the track finding at STS and muon system and momentum reconstruction at STS.

MUCH software

Much software consist of the routines, like CbmMuchHitProducer.cxx, placed in the /cbmroot2/much/ subdirectory; much track finder CbmL1MuchFinder.cxx is located at /cbmroot2/L1/OffLineInterface, where users can also put the analysis routines. Process of the typical MUCH analysis includs 4 major steps:

MC transport of UrQmd event with embedded signal through choosen MUCH geometry
STS track reconstruction (L1CATrackFinder, L1TrackFitter, PrimaryVertexFinder)
Much track reconstruction, based on Kalman filter technique
Analysis (invariant mass spectra, "Super Event", etc.)

Correspondent macros (see for example much_sim*.C, sts_reco*.C and much_reco*.C) are located at /cbmroot2/macro/much/ directory.

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I	Attachment	Action	Size	Date	Who	Comment
	CBM_MuonW.jpg	manage	47.0 K	29 Nov 2006 - 16:55	IouriVassiliev	CBM Much detector

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