CMS has recently produced an updated search for black hole production in the 7 TeV proton-proton collisions delivered by the LHC. The data sample now consists of 190 inverse picobarns of collisions collected in 2011, and the limits set on black hole production are more stringent.
The search uses a variable called "S_T", which is the sum of transverse energies of all energetic objects detected in the final state: jets, but also, when present, electrons and muons, as well as photons and missing transverse energy. This variable would be sensitive to the production of black holes, which would produce a enhancement in the high-end of the S_T spectrum. In the figure below you can see what I am talking about, for the subset of events having at least six identified bodies with transverse energy above 50 GeV:
As you can see, the data (black point with error bars) follow the blue background prediction, while enhancements (the dashed curves) would be present at large S_T if black holes existed with the parameter values specified. There are some very high-S_T events in the tail of the distribution, but they are compatible with expected backgrounds; from the agreement, limits can be set on the existence of black holes.
The figure below shows a nice event display, where ten energetic jets are produced together. Calling this a "black-hole candidate" would appear sensationalistic, but it is actually what the CMS experiment does in its public document.
The detector in this graph is seen in its transverse view, just as if you were looking at it from the beam line. Charged tracks are emitted in all directions, and they cluster in 10 different jets of hadrons, which produce as many energy deposits in the calorimeter. The latter are displayed as red and blue bars outside the schematized detector view.
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Erupting Bardarbunga Volcano In Iceland Sits On A Massive Magma Hot Spot
- Genetically Modified Stem Cells Kill Brain Tumors
- Researchers Created A Laser Bullet To See What It Would Look Like - And Here It Is
- How Gut Bacteria Ensure A Healthy Brain – and Could Play A Role In Treating Depression
- Ebola's Evolutionary Roots Are Ancient
- We're Too Late To Prevent 137,000 More Ebola Cases, Says Epidemiology Paper
- ECFA Workshop: Planning For The High Luminosity LHC
- "Hi Dhrou,of course the HL-LHC lumi leveling is different from the LHCb one - a glance at the plot..."
- "Sorry but a ridiculous test made by an anonymous source does not even qualify to be discussed here..."
- "/* Science advances as much by mistakes as by plans. */ Apparently the mainstream physicists are..."
- "Part of being a theorist in any subfield is trying to explain the results that we have in hand..."
- "This essay interested me immensely. My father claimed to be an 'atheist' all his life but..."
- How to sell a toxic pesticide the smart way–call it organic
- Leftist dystopia? Anti-technology fever animates opposition to GMOs and other ‘disruptive’ technologies
- CDC faced a nearly impossible balancing act with Ebola, and failed
- Why Chobani reversed course, making yoghurt only from milk from cows not fed GMO grain
- Monterey, California, hotbed of anti-GMO activism, home to new GMO corn farm
- Evolution is sometimes messy or even outright ridiculous