نتایج جستجو برای: gev
تعداد نتایج: 18737 فیلتر نتایج به سال:
We consider six dimensional gauge models compactified on the orbifold T /ZN (N = 2, 3, 4, 6) such that the Standard Model (SM) Higgs doublet arises from the extra-dimensional components of the gauge field. For Λ ≤ 10 GeV, where Λ denotes the compactification scale, we obtain 114.4 GeV ≤ mH ≤ 164 GeV for the SM Higgs boson mass. We also consider gaugeHiggs-top and gauge-Higgs-bottom Yukawa unifi...
Using the ZEUS detector at HERA, we have searched for heavy excited states of electrons, neutrinos, and quarks in e + p collisions at a center-of-mass energy of 300 GeV. With an integrated luminosity of 9.4 pb ?1 , no evidence was found for electroweak production and decay of such states. Limits on the production cross section times branching ratio and on the characteristic couplings, f =, are ...
We show that there is a calculable upper limit on the mass of the lightest Higgs boson in any supersymmetric theory that remains perturbative up to a high scale . There are no restrictions on the Higgs sector, or the gauge group or particle content. We estimate the value of the upper limit to be mh◦ < 146 GeV for 100 GeV <∼ Mt <∼ 145 GeV, from all effects except possibly additional heavy fermio...
Separated longitudinal and transverse cross sections for charged pion electroproduction from (1)H, (2)H, and (3)He were measured at Q(2) = 0.4 (GeV/c)(2) for two values of the invariant mass, W = 1.15 GeV and W = 1.60 GeV, in a search for a mass dependence which would signal the effect of nuclear pions. This is the first such study that includes recoil momenta significantly above the Fermi surf...
A study is made of what SUSY signals would be observable for mSUGRA models in a 500-GeV linear collider. All current experimental bounds on the mSUGRA parameter space are imposed. For m0 < 1 TeV (or alternately if the current gμ − 2 anomaly maintains) the only observable signals that remain are slepton pair production and neutralino production of χ̃ 2 + χ̃ 1 . Slepton pair production can occur fo...
If the Standard Model is valid up to scales near the Planck mass, and if the cosmological constant and Higgs mass parameters scan on a landscape of vacua, it is well-known that the observed orders of magnitude of these quantities can be understood from environmental selection for large scale structure and atoms. If in addition the Higgs quartic coupling scans, with a probability distribution pe...
The role of beamstrahlung in high-energy e(+)e(-) storage-ring colliders (SRCs) is examined. Particle loss due to the emission of single energetic beamstrahlung photons is shown to impose a fundamental limit on SRC luminosities at energies 2E(0)≳140 GeV for head-on collisions and 2E(0)≳40 GeV for crab-waist collisions. With beamstrahlung taken into account, we explore the viability of SRCs in...
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