Synopsis: No Hint of Exotic Higgs Particles

An analysis of data from the now-shuttered Tevatron excludes certain Higgs bosons with exotic properties.
Synopsis figure
Tevatron/Fermilab

In 2012, the ATLAS and CMS collaborations at the Large Hadron Collider (LHC) in Geneva discovered a Higgs boson that was consistent with the standard model of particle physics. However, some theories propose that other Higgs-like particles with different properties may exist alongside the standard model Higgs. A new analysis of data from Fermilab’s Tevatron outside of Chicago sets limits on some of these “exotic Higgs” particles.

The standard model predicts that the Higgs boson is a scalar particle, which means it has zero spin and even parity (describing how it behaves in a mirror reflection). The Higgs discovered at the LHC is a scalar particle, as verified in data where the particle decays into other bosons (W and Z bosons, as well as photons). It’s still possible, however, that an exotic Higgs boson of similar mass exists but decays preferentially through other channels.

The Tevatron, which shut down in 2011, studied proton-antiproton collisions at energies of 1.96 tera-electron-volts, about a factor of 4 below the LHC’s collision energy in 2012. In spite of this, the two Tevatron-based experiments, CDF and D0, uncovered evidence in 2012 of a Higgs boson decaying into fermions, specifically, a pair of bottom quarks. The two collaborations have again combined their data to check for exoticness in this fermion decay channel. The Tevatron data show no signal consistent with a Higgs boson having spin zero and odd parity (a so-called pseudoscalar) or spin 2 and even parity (gravitonlike). The results are important for building the case that the Higgs boson seen in particle colliders is indeed the standard model Higgs.

This research is published in Physical Review Letters.

–Michael Schirber


Features

More Features »

Announcements

More Announcements »

Subject Areas

Particles and Fields

Previous Synopsis

Atomic and Molecular Physics

Rapid Alignment

Read More »

Next Synopsis

Superconductivity

Superconductors Under Pressure

Read More »

Related Articles

Viewpoint: A Doubly Charming Particle
Particles and Fields

Viewpoint: A Doubly Charming Particle

High-precision experiments at CERN find a new baryon containing two charm quarks. Read More »

Synopsis: A Precise Probe of the Quark-Gluon Plasma
Particles and Fields

Synopsis: A Precise Probe of the Quark-Gluon Plasma

Properties of the quark-gluon plasma can be inferred from measurements of jets and Z bosons simultaneously produced in the ion collisions that create the plasma. Read More »

Synopsis: Filling in a Tetraquark’s Profile
Particles and Fields

Synopsis: Filling in a Tetraquark’s Profile

An analysis of electron-positron collision data has determined the spin and parity of a particle thought to consist of four quarks. Read More »

More Articles