Explore collider kinematics with masses and luminosity controls. Estimate cross section, recoil and selected events. Plot energy scans for clearer threshold and peak behavior.
Use the responsive input grid below. It shows three columns on large screens, two on smaller screens, and one on mobile.
The graph tracks polarized effective cross section and selected event yield versus center-of-mass energy.
| Example | √s (GeV) | mZ (GeV) | mH (GeV) | σpol (fb) | Recoil Mass (GeV) | Selected Events |
|---|---|---|---|---|---|---|
| Inclusive default setup | 250.0 | 91.1876 | 125.25 | 237.4743 | 125.2500 | 118737.128 |
| Z→ℓℓ, H→bb, 70% efficiency | 250.0 | 91.1876 | 125.25 | 237.4743 | 125.2500 | 3258.743 |
| Near threshold test | 220.0 | 91.1876 | 125.25 | 105.9007 | 125.2500 | 52950.340 |
The example values are tree-level style estimates using the formulas implemented in this page.
For a stationary pair, the minimum released rest energy is 1.022 MeV, usually appearing as two 511 keV photons. In collider conditions, the total available center-of-mass energy can be much larger and may produce heavy states such as ZH once the threshold is exceeded.
The basic threshold is the sum of the final-state masses: mZ + mH. Using the default values here, that is about 216.4376 GeV. Below this energy, on-shell ZH production is not kinematically allowed.
Near threshold, the phase space opens quickly, so the rate rises. At higher energies, the s-channel behavior falls. Their combination creates a broad maximum around the low few-hundred-GeV region for Standard Model style Higgsstrahlung studies.
Recoil mass is the invariant mass of everything opposite the reconstructed Z boson. If the measured Z energy and visible mass are accurate, the recoil peak can identify the Higgs without requiring direct reconstruction of its decay products.
Electron and positron polarizations change the effective initial-state chiral weights. That can enhance or suppress the production rate. This page applies a compact scaling factor based on the left- and right-handed electron couplings to the Z boson.
No. It is a tree-level style calculator designed for fast studies and educational estimates. Precision collider analyses usually include radiative corrections, beam effects, acceptance modeling, and detector smearing.
The page multiplies the polarized effective cross section by integrated luminosity, then scales by the chosen Z branching ratio, Higgs branching ratio, and efficiency. This gives a selected-event estimate for your chosen channel and analysis setup.
Masses, energies, and momentum are reported in GeV. Cross section is shown in femtobarns. Luminosity is entered in inverse femtobarns. Event yields are simple counts, while beta and gamma are dimensionless relativistic quantities.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.