Measurement of the Top Quark mass
using data from CDF experimentat Tevatron
Fedor Prokoshin
Particles our world is made of
Neutrino
Leptons and quarks
Top Quark
Top QuarkmassMtop = 173.1±1.3 GeV/c2
• twice of W±, Z0
• 2 orders b• 4 orders u, d• 5 orders e-
Why Measure the Top Quark Mass?
• mtop is a fundamental parameter of the Standard Model
• constrains the mass of the elusive Higgs Boson: 1-loop corrections to mW depend quadratically on the top quark mass mtop and logarithmically on mH. Measuring mtop and mW one can extract information on mH
22tW mm
W W
H
W
W W
t
b
HW mm log2
173.1 1.3tM GeV 2009
174 15tM GeV 1994-95
CDF199 30tM GeV DǾ
History of top mass measurements
172.1 1.4tM GeV 2008
170.9 1.8tM GeV 2007
171.4 2.1tM GeV 2006
178.0 4.3tM GeV 2004 (Data 1992-1996)
172.7 2.9tM GeV 2005
176.7 7.1tM GeV 2004
Main Injectorand Recycler
p source
Booster
DD Tevatron
• Collisions every 396 ns• Beam energy 980 GeV s = 1.96 TeV
• Inst. Lum. ~5x1032 cm-
2s-1
CDF Detector
CDF II Collaboration
BACKUP SLIDES
Gervasio Gomez/CDF Moriond EW 2005 14
Top MassMt 175 GeV Yukawa coupling 1 Special role in EWSB?
Dominant parameter in radiative corrections:
quadratic in mt , logarithmic in mH
GeV166181
),(,sin,, 2
top
WFBZZ
M
MZAM
GeV100070HiggsMHiggstop MEWM
Mt from precision EW measurements
