Short description.
We study the sensitivity of ILD to detect low mass, higgs-like states. This is done with the recoil-technique, ie. we only search for and measure the Z(*) decays into two muons, and search for peaks in the the recoil-mass spectrum. The actual decay-mode of the Higgs-like object is not important. Many BSM models predict such states, and once the decay-modes and/or the coupling to the Z is significantly different (lower) than the SM-higgs, such a state might well have escaped detection at LEP (and LHC).
This benchmark in particular can probe three features:
- Muon detection, in particular isolated ones.
- Muon identification.
- Detecting, identifying and measuring ISR photons.
Main observables.
The main direct observables for the signal are the momentum and identity of decay-products of the Z, Depending on the mass of the Higgs-like object, the Z might be on-shell or off-shell. Different patterns of "return to the Z" ISR will also emerge depending on the Higgs-like object's mass. The physics observable is the exclusion/discovery range for such states as a function of their mass, and the strength of the coupling to the Z wrt that of the SM higgs - Z coupling.
Optimisation deliverables.
- Isolated muon detection and identification
- ISR finding and reconstruction
IDR plots.
reconstructed Z boson mass
2 fermion channel
lepton_pair_inm_2f.C lepton_pair_inm_difference_2f.C
M_{S}=20 GeV
lepton_pair_inm_nh_20.C lepton_pair_inm__difference_nh20.C
ISR Photon tagging efficiency
ISRphoton_tagging_efficiency.C
Recoil mass distribution
The exclusion limits plots
IDR note.
People
Main investigator: Yan Wang , assisted by Jenny List and Mikael Berggren, reviewed by Kiyotomo Kawagoe and Junping Tian.
Code
The GitHub repository is ILDbench_extraH in the ILDAnaSoft project.
References.
...
Backup plots, mainly for different scalar masses.
reconstructed Z boson mass
M_{S}=100 GeV
lepton_pair_inm_nh_100.pdf lepton_pair_inm_difference_nh_20.pdf
lepton_pair_inm_nh_100.C lepton_pair_inm__difference_nh100.C
M_{S}=200 GeV
lepton_pair_inm_nh_200.pdf lepton_pair_inm__difference_nh200.pdf
lepton_pair_inm_nh_200.C lepton_pair_inm__difference_nh200.C
M_{S}=300 GeV
lepton_pair_inm_nh_300.pdf lepton_pair_inm__difference_nh300.pdf
lepton_pair_inm_nh_300.C lepton_pair_inm_difference_nh300.C