270 research outputs found
Getting ready for Physics at the LHC with the CMS Detector
In order to get ready for physics at the LHC, the CMS experiment has to be
set up for data taking. The data have to be well understood before new physics
can be investigated. On the other hand, there are standard processes, well
known from previous experiments and from simulation, which will help to
understand the data of the detector in the early days of the LHC.Comment: presented at Lake Louise Winter Institute 2006, 17-23 February 2006,
Alberta, Canad
Comparison of Higgs Boson Mass and Width Determination of the LHC and a Linear Collider
Two important properties of a Higgs boson are its mass and width. They may
distinguish the Standard Model (SM) Higgs boson from Higgs bosons of extended
models. We show results from a direct mass and width reconstruction for a Higgs
boson mass range from 120 to 340 GeV. The mass and width have been
reconstructed from the H --> ZZstar --> mu+mu-mu+mu- reaction in an LHC
simulation of the CMS detector. The determined mass accuracy has been compared
with that obtained from studies for a linear collider (LC). The mass precision
from the latter studies is derived by scaling previous LC simulation results
according to the expected event rates. For the Higgs boson width we compare a
direct determination with indirect methods and find good complementarity.Comment: 4 pages, 4 figure
Searching for Higgs Bosons in Association with Top Quark Pairs in the H -> bb Decay Mode
Search for the Higgs Boson is one of the prime goals of the LHC. Higgs bosons
lighter than 130 GeV decay mainly to a b-quark pair. While the detection of a
directly produced Higgs boson in the bb channel is impossible because of the
huge QCD background, the channel ttH -> lnqqbbbb is very promising in the
Standard Model and the MSSM.
We discuss an event reconstruction and selection method based on likelihood
functions. The CMS detector response is performed with parametrisations
obtained from detailed simulations. Various physics and detector performance
scenarios are investigated and the results are presented. It turns out that
excellent b-tagging performance and good mass resolution are essential for this
channel.Comment: 10 pages, 6 figure
Prospects for Higgs Boson Searches in the Channel WH -> lnbb
We present a method how to detect the WH -> lnbb in the high luminosity LHC
environment with the CMS detector. This study is performed with fast detector
response simulation including high luminosity event pile up. The main aspects
of reconstruction are pile up jet rejection, identification of b-jets and
improvement of Higgs mass resolution.
The detection potential in the SM for m(H) < 130 GeV and in the MSSM is only
encouraging for high integrated luminosity. Nevertheless it is possible to
extract important Higgs parameters which are useful to elucidate the nature of
the Higgs sector. In combination with other channels, this channel provides
valuable information on Higgs boson couplings.Comment: 8 pages, 8 figure
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