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