3,332 research outputs found
Measuring properties of a Heavy Higgs boson in the decay
In many extensions of the standard model, there exist a few extra Higgs
bosons. Suppose a heavy neutral Higgs boson H is discovered at the LHC, one
could then investigate CP and CPT~ properties of its couplings to a pair of
bosons through . We use the helicity-amplitude method to
write down the most general form for the angular distributions of the four
final-state leptons, which can cover the case of CP-even, -odd, and -mixed
state for the Higgs boson. We figure out there are 9 types of angular
observables and all the couplings to bosons can be fully determined by
exploiting them. A Higgs-boson mass of 260 GeV below the threshold is
illustrated with full details. With a total of events of , one can determine the couplings up to 12-20\% uncertainties.Comment: 23 pages, 4 figures, 3 tables, to appear in JHE
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Research Not
Higgs-boson-pair production from gluon fusion at the HL-LHC and HL-100 TeV hadron collider
We perform the most up-to-date comprehensive signal-background analysis for
Higgs-pair production in channel at the HL-LHC
and HL-100 TeV hadron collider, with the goal of probing the self-coupling
of the Higgs boson. We simulate all the standard-model signal
and background processes with the simulation tools almost as sophisticated as
what experimentalists are using. We find that even for the most promising
channel at the HL-LHC with a luminosity of 3000
fb, the significance is still not high enough to establish the Higgs
self-coupling at the standard model (SM) value. Instead, we can only constrain
the self-coupling to at confidence level
after considering the uncertainties associated with the top-Yukawa coupling and
the estimation of backgrounds. Here we also extend the study to the HL-100 TeV
hadron collider. With a luminosity of 3 ab, we find there exists a bulk
region of 2.6 \lsim \lambda_{3H} \lsim 4.8 in which one cannot pin down the
trilinear coupling. Otherwise one can measure the coupling with a high
precision. At the SM value, for example, we show that the coupling can be
measured with about 20 \% accuracy. While assuming 30 ab, the bulk
region reduces to 3.1 \lsim \lambda_{3H} \lsim 4.3 and the trilinear coupling
can be measured with about 7 \% accuracy at the SM value. With all the
simulated background events and results, our study can be useful to probe the
Higgs potential of various models with extended Higgs sector, such as
two-Higgs-doublet model, MSSM, etc.Comment: 35 pages, 21 figures, 15 tables; New section V. FURTHER IMPROVEMENTS
ENVISAGED added, Tables VI and XII updated, references added; New Appendix C
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