[en] We study the general Higgs--weak-boson coupling with CP violation via the process e⁺e^-→fbar fh. We categorize the signal channels by the subprocesses of Zh production and ZZ fusion and construct four CP asymmetries by exploiting polarized e⁺e^- beams. We find complementarity among the subprocesses and the asymmetries to probe the real and imaginary parts of the CP-violating form factor. Certain asymmetries with unpolarized beams can retain significant sensitivity to the coupling. We conclude that at a linear collider with high luminosity, the CP-odd ZZh coupling may be sensitively probed via measurements of the asymmetries

[en] The potential for the Higgs boson and Z-pole physics at the first muon collider is summarized, based on the discussions at the ''Workshop on the Physics at the First Muon Collider and at the Front End of a Muon Collider''

[en] We study the production at future e⁺e^- linear colliders of the heavy neutral Higgs bosons H and A of the minimal supersymmetric standard model in association with top and bottom quarks. The cross sections have a strong dependence on the parameter tanβ, and thus provide a good way to determine it. At a linear collider with s=0.5--1 TeV and expected integrated luminosities, we find significant sensitivities for determining tanβ. In the supergravity scenario, the sensitivity is particularly strong for tanβ∼>10, reaching a 15% or better measurement. In the general MSSM scenario, the interplay between the 4b and 4t channels results in a good determination for tanβ∼<10, while the sensitivity is weakened for higher values of tanβ

No abstract available

[en] The ratio of neutral Higgs field vacuum expectation values, tanβ, is one of the most important parameters to determine in either the minimal supersymmetric standard model (MSSM) or a general type-II two-Higgs doublet model (2HDM). Assuming an energy and integrated luminosity of √s=500 GeV and L=2000 fb^-1 at a future linear collider (LC), we show that a very accurate determination of tanβ will be possible for low and high tanβ values by measuring the production rates of Higgs bosons and reconstructing Higgs boson decays. In particular, based on a TESLA simulation, and assuming no other light Higgs bosons and 100≤m_A≤200 GeV, we find that the rate for the process e⁺e^-→bb-bar A→bb-bar bb-bar provides a good determination of tanβ at high tanβ. In the MSSM Higgs sector, in the sample case of m_A=200 GeV, we find that the rates for e⁺e^-→bb-bar A+bb-bar H→bb-bar bb-bar and for e⁺e^-→HA→bb-bar bb-bar provide a good determination of tanβ at high and low tanβ, respectively. We also show that the direct measurement of the average total widths of the H and A in e⁺e^-→HA→bb-bar bb-bar events provides an excellent determination of tanβ at large values. In addition, the charged Higgs boson process e⁺e^-→H⁺H^-→tb-bar t-bar b has been studied. The sensitivity to tanβ at the LHC obtained directly from heavy Higgs boson production is briefly compared to the LC results

[en] Thirty-six patients treated for Hodgkin's disease (HD) or non-Hodgkin's lymphoma (NHL) who had been in complete remission and off all therapy for greater than two years were examined for evidence of immunosuppression. All patients were found to have marked depression of their lymphocyte blastogenic response to phytohemagglutinin (PHA) and of their skin test responses. No abnormalities of serum protein or immunoglobulins were found. T cells were significantly lower than normal in patients who had had Hodgkin's disease, but not in those who had had NHL. B cells, on the other hand, were significantly elevated in both groups. Splenectomy elevated the total lymphocyte count, while those who had not had a splenectomy had lower than normal lymphocyte counts. B cells were elevated while T cells tended to be lower in both splenectomy and nonsplenectomy groups, though only in the nonsplenectomized patients did this reach statistical significance. The PHA response tended to be higher in patients with less advanced disease and less extensive treatment than in those with more advanced disease and more extensive treatment, although there was no statistically significant difference. Skin test response though, was shown to correlate well with both stage of disease at diagnosis and extent of treatment

[en] We study the possibility of probing anomalous ZWW couplings at the LEP I collider in the decay Z→W^*W^*→lνqanti q'. By allowing both W-bosons to be off mass-shell, the rate is increased by a factor of 5 over previous calculations with one on-shell W. An anomalous ZWW coupling ΔK=±1 can be tested at 95% confidence level with 5x10⁷ Z's. (orig.)

[en] Human peripheral blood T and B lymphocytes were separated by a method based on the stable rosette formation of T lymphocytes with neuraminidase-treated sheep erythrocytes, followed by centrifugation over a Ficoll-Hypaque gradient. Monocytes were isolated from the T-depleted B lymphocyte preparation by allowing the monocytes to ingest iron particles and by subsequent centrifugation over a Ficoll-Hypaque gradient. The T lymphocytes responded extremely well to PHA and very well to PWM, while the B lymphocytes were unresponsive to either PHA or PWM. However, when the B lymphocytes were cultured together with irradiated autologous or allogeneic T lymphocytes (1 : 1,1:2 or 1 : 4 ratio), both PHA and PWM became mitogenic to B lymphocytes. Irradiated T lymphocytes alone did not respond to either PHA or PWM, indicating that the ³H-thymidine incorporation seen in the mixed-cell culture was due to the activation of unirradiated B lymphocytes. The B lymphocytes failed to respond to these phytomitogens in the presence of lower concentrations of irradiated T lymphocytes. The monocytes were found to be incapable of helping the B lymphocytes to respond to PHA or PWM. (author)

[en] Cross sections for the production of three gauge bosons at e⁺e^- and pp colliders are presented versus CM energy. The rates are measurable at high luminosity supercolliders and would test three and four gauge boson couplings of electroweak gauge theory. For example, at a 0.6 to 2 TeV e⁺e^- machine with an annual luminosity of 10⁴-10⁵ pb^-1 there would be 400-4000 identifiable WWZ events per year. (orig.)

[en] We study the processes W_LW_L→tt-bar and W_LZ_L→tb-bar (t-barb) at future lepton colliders as probes of the couplings of the top quark to resonances at the TeV scale. We consider the cases in which the dominant low energy feature of a strongly interacting electroweak symmetry breaking sector is either a scalar or a vector resonance with mass near 1 TeV. We find that future lepton colliders with high energy and high luminosity have great potential to sensitively probe these physics scenarios. In particular, at a 1.5 TeV linear collider with an integrated luminosity of 200 fb^-1, we expect about 120 events for either a scalar or a vector to decay to tt-bar, tb. Their leading partial decay widths, which characterize the coupling strengths, can be statistically determined to about 10% level