We investigate the Higgs sector of a non-linear sypersymmetric standard model at LEP 1 and LEP 2, as well as at future linear
e
+
e
− colliders with
s
= 500, 1000,
and 2000
GeV
. The LEP 1 data do ...not put any constraints on the parameters of the model, and allow a massless Higgs boson in particular. For LEP 2, there are remarkable differences between the Higgs productions at
s
= 175
GeV
on the one hand and that at
s
= 192
GeV
and 205
GeV
on the other hand. The case for
s
= 175
GeV
is similar to LEP 1, whereas those for
s
= 192
GeV
and 205
GeV
will be able to give experimental constraints on the parameters. Finally the
e
+
e
− colliders with
s
= 500, 1000,
and 2000
GeV
are most probably able to test the model conclusively.
Physics with e+e− linear colliders Accomando, E.; Andreazza, A.; Ballestrero, A. ...
Physics reports,
06/1998, Letnik:
299, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The physics potential of
e
+
e
− linear colliders is summarized in this report. These machines are planned to operate in the first phase at a center-of-mass energy of 500
GeV, before being scaled up ...to about 1
TeV. In the second phase of the operation, a final energy of about 2
TeV is expected. The machines will allow us to perform precision tests of the heavy particles in the Standard Model, the top quark and the electroweak bosons. They are ideal facilities for exploring the properties of Higgs particles, in particular in the intermediate mass range. New vector bosons and novel matter particles in extended gauge theories can be searched for and studied thoroughly. The machines provide unique opportunities for the discovery of particles in supersymmetric extensions of the Standard Model, the spectrum of Higgs particles, the supersymmetric partners of the electroweak gauge and Higgs bosons, and of the matter particles. High precision analyses of their properties and interactions will allow for extrapolations to energy scales close to the Planck scale where gravity becomes significant. In alternative scenarios, i.e. compositeness models, novel matter particles and interactions can be discovered and investigated in the energy range above the existing colliders up to the TeV scale. Whatever scenario is realized in Nature, the discovery potential of
e
+
e
− linear colliders and the high precision with which the properties of particles and their interactions can be analyzed, define an exciting physics program complementary to hadron machines.
Phys.Lett. B383 (1996) 179-186 We investigate the Higgs sector of a nonlinear supersymmetric standard model
at LEP 1 and LEP 2, as well as at future linear $e^+ e^-$ colliders with $\sqrt
s = 500$, ...1000, and 2000 GeV. The LEP 1 data do not put any constraints on the
parameters of the model, and allow a massless Higgs boson in particular. For
LEP 2, there are remarkable differences between the Higgs productions at $\sqrt
s = 175$ GeV on the one hand and that at $\sqrt s = 192$ GeV and 205 GeV on the
other hand. The case for $\sqrt s = 175$ GeV is similar to LEP 2, whereas those
for $\sqrt s = 192$ GeV and 205 GeV will be able to give experimental
constraints on the parameters. Finally the $e^+ e^-$ colliders with $\sqrt s =
500$, 1000, and 2000 GeV are most probably able to test the model conclusively.
We investigate the Higgs sector of a nonlinear supersymmetric standard model at LEP 1 and LEP 2, as well as at future linear \(e^+ e^-\) colliders with \(\sqrt s = 500\), 1000, and 2000 GeV. The LEP ...1 data do not put any constraints on the parameters of the model, and allow a massless Higgs boson in particular. For LEP 2, there are remarkable differences between the Higgs productions at \(\sqrt s = 175\) GeV on the one hand and that at \(\sqrt s = 192\) GeV and 205 GeV on the other hand. The case for \(\sqrt s = 175\) GeV is similar to LEP 2, whereas those for \(\sqrt s = 192\) GeV and 205 GeV will be able to give experimental constraints on the parameters. Finally the \(e^+ e^-\) colliders with \(\sqrt s = 500\), 1000, and 2000 GeV are most probably able to test the model conclusively.
Higgs Physics at LEP2 Carena, M; Zerwas, P; Accomando, E ...
arXiv (Cornell University),
02/1996
Journal Article
Odprti dostop
In this report we review the prospects for Higgs physics at LEP2. The
theoretical aspects and the phenomenology of Higgs particles are discussed
within the Standard Model (SM) and the Minimal ...Supersymmetric Standard Model
(MSSM). The experimental search techniques are described and the discovery
limits for Higgs bosons in the LEP2 energy range are summarized. In addition,
opportunities of detecting Higgs particles in non-minimal extensions of the SM
and the MSSM are investigated.
Higgs Physics at LEP2 Carena, M; Zerwas, P; Accomando, E ...
arXiv.org,
02/1996
Paper
Odprti dostop
In this report we review the prospects for Higgs physics at LEP2. The theoretical aspects and the phenomenology of Higgs particles are discussed within the Standard Model (SM) and the Minimal ...Supersymmetric Standard Model (MSSM). The experimental search techniques are described and the discovery limits for Higgs bosons in the LEP2 energy range are summarized. In addition, opportunities of detecting Higgs particles in non-minimal extensions of the SM and the MSSM are investigated.
Protein kinase C (PKC), a calcium and phospholipid-dependent kinase, has been implicated in carcinogenesis of melanocytic cells. However, its role in melanoma cell growth remains controversial. We ...therefore investigated the growth dependence of PKC isozyme expression in human normal melanocytes and melanoma cells. Logarithmic and stationary growth phases in culture were clearly distinguished by nuclear cell staining with the proliferation marker Ki-67. PKC-beta I and -beta II were expressed exclusively in normal melanocytes but not in melanoma cells, whereas PKC-gamma was not found in any of the cultures studied. Low PKC-delta, -epsilon and -zeta mRNA levels were detected by RT-PCR in proliferating melanoma cells and higher in confluent non-proliferating cells, whereas levels of PKC-alpha mRNA remained rather stable. Subcellular fractionation and immunoblotting revealed accordingly low expression of PKC-alpha, -delta, -epsilon, and -zeta in the logarithmic growth phase of melanoma cells, with subsequent increase of expression and of membrane association in the stationary phase. Only weak differences were detected between the growth phases in normal melanocytes for the respective PKC isozymes, except for membrane-associated PKC-beta I and -beta II which were clearly elevated in confluent melanocyte cultures. These data suggest that certain PKC isozymes are involved in the intracellular signalling that regulates melanoma cell proliferation, and may function as suppressors of tumour cell growth.
The physiological importance of recognitive protein-carbohydrate interactions is by no means restricted to mammals. Thus, the analysis of expression of sugar receptors in lower vertebrates is ...warranted, employing carrier-immobilized carbohydrate ligands. The present work initiates such a systematic glycohistochemical mapping of endogenous sugar receptor expression, focussing on fish epidermis. A battery of biotinylated neoglycoproteins exposing 11 different types of ligand structures, and the avidin-biotin-peroxidase complex (ABC) technique has been used to assess extent of binding on Bouin's solution-fixed paraffin-embedded specimens. The semi-quantitative evaluation disclosed both quantitative and qualitative site-associated differences in expression of endogenous lectins by the integument constituents. Moreover, a distinct expression of sugar receptors by two or three types of trunk myocytes was also observed. This study thus emphasized the feasibility of glycohistochemistry with neoglycoproteins, conducted in lower vertebrates. The approach used with carbohydrate constituents of cellular glycosubstances as ligands in search of specific receptors is proposed to be a powerful complementary tool in carbohydrate histochemistry to the monitoring of the carbohydrate structures by labelled plant or invertebrate lectins and a step to elucidate the functional significance of protein-carbohydrate interactions.
DEUTSCH: In den letzten Jahren stieg der Kohlendioxidgehalt (CO2) der Atmosphaere staendig an. Seit 1958 wird dies mit den heutigen Hilfsmitteln wie Satteliten, Klima-Rechen-Modellen etc. durch das ...Scripps Inst. of Oceanography, Kalifornien, ueberwacht. In diesem Bericht - der Fakten und Beobachtungen in den Vordergrund rueckt-werden zunaechst die wichtigsten Spurengase behandelt, die an dem Treibhauseffekt beteiligt sind, dann unsere Kenntnisse ueber die Entwicklung von CO(2)-Gehalt und Klima im Laufe der letzten 100000-150000 Jahre und die Modellergebnisse ueber den Zusammenhang zwischen CO(2) und Klima. Hieran schliesst sich ein Abschnitt ueber die Zeitskala natuerlicher Klimaschwankungen an; nach einer kurzen Zusammenfassung werden die Perspektiven fuer eine nahe Zukunft eroertert.
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