Dear Experts
I have a question about a 2HDM-QFV UFO sample for FCC-ee H->bs at sqrt(s)=240 GeV.
We tested wzp6_ee_mumuH_Hbs_ecm240, which is a 2HDM-QFV UFO sample with the four-body process
process proc = “e-”, “e+” => (“mu-”, “mu+”, “b~”, s)
- (“mu-”, “mu+”, b, “s~”) {
$restrictions = “5+6~h1”
}
The UFO has MZ = 91.1876 GeV, mh1 = 125 GeV, and a ZZh1 coupling scale of about 0.95. However, this sample gives an m_mumu peak about 1 GeV lower than expected.
To understand this, we compared with the standard wzp6_ee_mumuH_ecm240 and wzp6_ee_mumuH_Hbb_ecm240 samples. In both cases, our workflow correctly reconstructs the m_mumu peak around the Z mass.
We also found the card/sample name
wzp6_ee_mumuH_Hbs_W4p1MeV_ecm240
in FCC-config and on the FCC physics events website. My understanding is that it uses
process proc = e1, E1 => e2, E2, H
with PYTHIA6 forced to decay H → b sbar and H → bbar s.
However, the corresponding directory on the website seems to be empty. Could you confirm whether this sample is available somewhere, or whether only the configuration exists?
For the QFV UFO case, could you advise whether the clean resonant topology should instead be generated with both restrictions,
$restrictions = “3+4Z && 5+6h1”
and whether the shifted m_mumu shape with only 5+6~h1 is expected from the unrestricted four-body process definition?
Best,
Ang
