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LOCH LEMAN MONSTERDrift Tubes in CMS at LHC
Where
100 m underneath Earth, near a city called Geneva, a 27 km tunnel hostes 4 of the greatest monsters of nature.
1011 protons are bolted down 40 million times a second bythese monsters. Within it, a milliard of particles are created, making its diet very divers (muons, neutrinos, s-particles… Higgs bosons?)
diet
This cilinder-shaped monster with the size of a 5-story building is supposed to live inside thetunnel. The particles created after the collision are
bended due to its solenoidal B field, identiying them and measuring their momenta
CMS
Muons are an essential part in CMS diet. They are a very clear signal to detect more interesting particles such as theHiggs boson or s-particles. Muons are detected in DT, RPC and CSC stomachs.
DT
CRUZET AND CRAFT
DRIFT VELOCITY
DT CHAMBER EFFICIENCY
There are 250 DT chambers in CMS, 25% built in CIEMAT (Madrid)
MB4MB3
MB2MB1
S5
DT CALIBRATION
driftTDC vttx )( 0 Calibration
Transformation from time to position
Time measured in DT cell
µ µ
t0 calibration
vd calibration
Detection in a DT cell
My fight against the monster
µ
trigger
Eff vs #hitsEff vs pt
B field effect
Efficiency
)/(21000
max
nsmT
vdrift
231
2t
ttT
)(max
MUONS in cms
Javier Santaolalla, SUSSP 2009, St Andrews
MB2