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TOPIC: Higgs Particles


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Title: Higgs production and decay processes via loop diagrams in various 6D Universal Extra Dimension Models at LHC
Authors: Kenji Nishiwaki

We calculate loop-induced Higgs production and decay processes which are relevant for the LHC in various six-dimensional Universal Extra Dimension models. More concretely, we focus on Higgs production through gluon fusion and Higgs decay into two photons induced by loop diagrams. They are one-loop leading processes and the contribution of Kaluza-Klein particles is considered to be significant. These processes are divergent in six dimensions. Therefore, we employ momentum cutoff, whose size is fixed from the validity of perturbative calculation through naive dimensional analysis. In these models, the Higgs production cross section strongly increases considerably and the Higgs decay width is somehow reduced. Especially in the case of the compactification on Real Projective Plane, these effects are remarkable. We can put a bound on the inverse compactification radius by use of the recent Tevatron experimental data. The deviation of the h^{(0)}
ightarrow 2 \gamma signal from the prediction of the Standard model is much larger than that in the case of the five-dimensional minimal UED model.

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Title: Higgs Discovery through Top-Partners using Jet Substructure
Authors: Graham D. Kribs, Adam Martin, Tuhin S. Roy

Top-partners -- vector-like quarks which mix predominantly with the top quark -- are simple extensions of the standard model present in many theories of new physics such as little Higgs models, topcolor models, and extra dimensions. Through renormalizable mixing with the top quark, these top-partners inherit couplings to the Higgs boson. Higgs bosons produced from the decay of top-partners are often highly boosted and ideal candidates for analyses based on jet substructure. Using substructure methods, we show that light Higgs bosons decaying to b b-bar can be discovered at the 14 TeV LHC with less than 10 inverse fb for top-partner masses up to 1 TeV.

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Physicists have moved to quash rumours that the elusive Higgs boson - dubbed the God particle - has been detected by a US "atom smasher".
A spokesman for the lab which operated the Tevatron accelerator denied scientists had made a discovery there.

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Rumours are emerging from the rival to the Large Hadron Collider that the Higgs boson, or so-called "God particle", has been found.
Tommaso Dorigo, a physicist  at the University of Padua, has said in his blog that there has been talk coming out of the Fermi National Accelerator Laboratory in Batavia, Illinois, that the Higgs has been discovered.
The Tevatron, the huge particle accelerator at Fermi - the most powerful in the world after the LHC - is expected to be retired when the CERN accelerator becomes fully operational, but may have struck a final blow before it becomes obsolete.

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Scientists have simulated the sounds set to be made by sub-atomic particles such as the Higgs boson when they are produced at the Large Hadron Collider.
Their aim is to develop a means for physicists at Cern to "listen to the data" and pick out the Higgs particle if and when they finally detect it.

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US experiment hints at 'multiple God particles'

There may be multiple versions of the elusive "God particle" - or Higgs boson - according to a new study.
Finding the Higgs is the primary aim of the £6bn ($10bn) Large Hadron Collider (LHC) experiment near Geneva.
But recent results from the LHC's US rival suggest physicists could be hunting five particles, not one.
The data may point to new laws of physics beyond the current accepted theory - known as the Standard Model.

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Title: CDMS II result and Light Higgs Boson Scenario of the MSSM
Authors: Masaki Asano, Shigeki Matsumoto, Masato Senami, Hiroaki Sugiyama
(Version v2)

The CDMS Collaboration has reported two candidate events for dark matter. If the events are due to the elastic scattering of dark matter, the dark matter would be a WIMP dark matter with its mass of the order of 10-100GeV and its scattering cross section with a nucleon is about 10^-43cm^2. We show that such a dark matter is properly realised as a neutralino dark matter in the light higgs boson scenario of the MSSM. The lightest higgs boson mass can be lighter than 114.4GeV in the scenario because of a suppressed interaction between higgs boson and Z bosons. As a result, a large scattering cross section between the dark matter and ordinary matter is obtained.

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'Quantum spread' threat to Hawking's bet

Stephen Hawking is something of a gambler when it comes to physics, placing bets on everything from the action of black holes to the discovery of gravitational waves. The bad news for Hawking is that a touch of "quantum smearing" could significantly lower his chances of winning his latest wager.
In 2002, Hawking bet his University of Cambridge colleague Neil Turok that cosmologists would soon discover primordial gravitational waves and so verify the theory of inflation. Our universe is thought to have undergone inflation - a period of exponential expansion - a fraction of a second after the big bang, generating ripples in the fabric of space-time called gravitational waves.

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Orbiting telescope could beat the LHC

Evidence for the Higgs boson could be pouring down upon us from deep space. If so, an orbiting space telescope could upstage the Large Hadron Collider in the search for the elusive particle.
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