Transcript Document
Higgs & Precision Electroweak Group Summary
Berger et al., hep-ph/0205342 (published)
Higgs jets (no specific flavor),
dominantly, e.g.,
• into pair light bottom squarks. R-parity
violating decays in to jets
• light CP-odd scalars
LHC “flails around”, loses normal
discovery modes, sees odd excesses,
SUSY cascades through Higgs to jets
LC still viable to sort out!
LHC loses
all > 3s
Rick Van Kooten, Indiana University, LC Workship, Cornell, 16 July 2003
Baur, Plehn, Rainwater: for trilinear Higgs self-coupling, compare
LHC
to
Mh < 140–150 GeV, HH bbbb (bbtt)
LC
Mh < 140–150 GeV, HH WWWW
Higgs mass 150 – 200 GeV,
LHC with 300 fb–1 can rule out
l = 0 @ 95% C.L.
LC: l to ±20%,
decent to ~150 GeV
In this heavier mass range,
extrapolating other analyses,
LHC can be better at
constraining l (but needs
checking…)
LC better lighter,
LHC better heavier,
complementary
Barklow: to better on Br precisions by going to higher energy and
larger cross section for WW fusion? (c.f. Battaglia et al.)
Kilian: see plenary talk, Sunday
Little Higgs?
BIG PHYSICS!!
Tailor-made for the LC!:
• light Higgs doublet(s), heavy Higgs multiplets, sort it out!
absolute Br’s, total width, self-coupling
• new heavy vector bosons, W’, Z’
precision measurements, virtual effects
• heavy vector-like top quark
tt pair measurements
Precision Electroweak Summary
Graham Wilson
Achim Weidemann
E-166 Experiment
45 collaborators
E-166 is a demonstration of undulator-based
polarized positron production for linear colliders
• E-166 uses the 50 GeV SLAC beam in conjunction with 1 m-long, helical
undulator to make polarized photons in the FFTB.
• These photons are converted in a ~0.5 rad. len. thick target into polarized
positrons (and electrons).
• The polarization of the positrons and photons will be measured.
Polarimeter Overview
4 x 109
4 x 107
1 x 1010 e 4 x 109
4 x 109
2 x 107 e+
2 x 107 e+
4 x 105 e+
4 x 105 e+
1 x 103
(N_n “discrepancy” and
NuTeV)
Preprint to appear soon
Neutrino-electron scattering experiment is another possibility