Calculation of W b b ¯ production via double parton scattering at the LHC
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Berger, Edmond L.↗
Engineering topics
Jackson, C B
Publications and source records attributed to Jackson, C B.
Higgs boson search sensitivity in the H{yields}WW dilepton decay mode at {radical}(s)=7 and 10 TeV
Prospects for discovery of the standard model Higgs boson are examined at center-of-mass energies of 7 and 10 TeV at the CERN Large Hadron Collider. We perform a simulation of the signal and principal backgrounds for Higgs boson production and decay in the W{sup +}W{sup -} dilepton mode, finding good agreement with the ATLAS and CMS collaboration estimates of signal significance at 14 TeV for Higgs boson masses near m{sub H}=160 GeV. At the lower energy of 7 TeV, using the same analysis cuts as these collaborations, we compute expected signal sensitivities of about 2 standard deviations ({sigma}'s) at m{sub H}=160 GeV in the ATLAS case, and about 3.6{sigma} in the CMS case for 1 fb{sup -1} of integrated luminosity. Integrated luminosities of 8 fb{sup -1} and 3 fb{sup -1} are needed in the ATLAS case at 7 and 10 TeV, respectively, for 5{sigma} level discovery. In the CMS case, the numbers are 2 fb{sup -1} and 1 fb{sup -1} at 7 and 10 TeV. Our different stated expectations for the two experiments arise from the more restrictive analysis cuts in the CMS case and from the different event samples in the two cases. Recast as exclusion limits, our results show that with 1 fb{sup -1} of integrated luminosity at 7 TeV, the LHC may be able to exclude m{sub H} values in the range 160 to 180 GeV provided no signal is seen.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗
Higgs in space!
We consider the possibility that the Higgs can be produced in dark matter annihilations, appearing as a line in the spectrum of gamma rays at an energy determined by the masses of the WIMP and the Higgs itself. We argue that this phenomenon occurs generally in models in which the the dark sector has large couplings to the most massive states of the SM and provide a simple example inspired by the Randall-Sundrum vision of dark matter, whose 4d dual corresponds to electroweak symmetry-breaking by strong dynamics which respect global symmetries that guarantee a stable WIMP. The dark matter is a Dirac fermion that couples to a Z{prime} acting as a portal to the Standard Model through its strong coupling to top quarks. Annihilation into light standard model degrees of freedom is suppressed and generates a feeble continuum spectrum of gamma rays. Loops of top quarks mediate annihilation into {gamma}Z, {gamma}h, and {gamma}Z{prime}, providing a forest of lines in the spectrum. Such models can be probed by the Fermi/GLAST satellite and ground-based Air Cherenkov telescopes
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗