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CMS search excludes some microscopic black hole masses

Physics and Astronomy research
Photo by bt_real on Pixabay
Research area:Particle physicsNuclear and High Energy PhysicsHigh-Energy Particle Collisions Research

What the study found

The study reports a search for microscopic black holes and electroweak sphalerons using proton-proton collision data from CMS. It finds that semiclassical black holes with masses below 9.0-11.4 TeV are excluded in models with large extra dimensions, and it sets a 95% confidence-level upper limit of 0.0025 for sphaleron transitions in quark-quark interactions above 9 TeV center-of-mass energy.

Why the authors say this matters

The authors state that the black hole result significantly extends previous sensitivity. They also present the sphaleron limit as part of a dedicated search for electroweak sphaleron transitions.

What the researchers tested

The researchers analyzed proton-proton collision data collected by the CMS detector from 2016 to 2018, corresponding to an integrated luminosity of 138 fb−1. They used a novel tool to identify collider events with distinct kinematic features, based on the phase space distance between events.

What worked and what didn't

For the black hole search, the data exclude semiclassical black holes below 9.0-11.4 TeV in the specified large-extra-dimension models. For the sphaleron search, the study sets an upper limit of 0.0025 at 95% confidence level on the fraction of quark-quark interactions above the nominal 9 TeV threshold that produce sphaleron transitions.

What to keep in mind

The abstract does not describe detailed limitations beyond the stated model context and energy threshold. The black hole exclusion is given for models with large extra dimensions, and the sphaleron limit applies to quark-quark interactions above a nominal 9 TeV threshold.

Key points

  • CMS analyzed 2016-2018 proton-proton collision data totaling 138 fb−1.
  • The search excluded semiclassical black holes below 9.0-11.4 TeV in models with large extra dimensions.
  • The authors say the black hole result significantly extends previous sensitivity.
  • A 95% confidence-level upper limit of 0.0025 was set for sphaleron transitions in quark-quark interactions above 9 TeV.
  • The event selection used a novel tool based on phase space distance between events.

Disclosure

Research title:
CMS search excludes some microscopic black hole masses
Image credit:
Photo by bt_real on Pixabay
AI provenance: AI provenance information is not available for this post.

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