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Posts Tagged ‘LHC

Black holes, TeV-scale gravity and the LHC

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The geometry of a higher-dimensional black hole on the brane

The geometry of a higher-dimensional black hole on the brane

Elizabeth Winstanley
Over the past 15 years models with large extra space-time dimensions have been extensively studied.
We have learned from these models that the energy scale of quantum gravity may be many orders of magnitude smaller than the conventional value of 1019 GeV.
This raises the tantalizing prospect of probing quantum gravity effects at the LHC.
Of the possible quantum gravity processes at the LHC, the formation and subsequent evaporation of microscopic black holes is one of the most spectacular.
We give an overview of some of the fundamental ideas of the large extra dimensions scenarios and the resulting black hole processes at the LHC.
Read more at http://arxiv.org/pdf/1306.5409v1.pdf

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June 29, 2013 at 4:46 pm

LHC upgrade to open up ‘new realm of particle physics’

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lhcEngineers have begun a major upgrade of the Large Hadron Collider (LHC).

Their work should double the energy of what’s already the most powerful particle accelerator in the world.

BBC News is the first to be allowed to see inside the LHC – on the French-Swiss border – to watch the work being carried out.

Scientists believe the upgrade will enable them to discover new particles which will lead to a more complete theory of how the Universe works.

A project leader with the LHC’s Atlas experiment, Dr Pippa Wells told BBC News that there was much more to come from the LHC.

“The past two years have been the most exciting in my time as a particle physicist. People are absolutely fired up. They’ve made one new discovery (the Higgs) and they want to make more discoveries with the new high energies that the upgrade will give us. We could find a new realm of particle physics”.

I was taken by the technical coordinator for the upgrade project, Katy Foraz and Cern’s UK communications manager Stephanie Hills, to one of the many access points to the LHC’s underground tunnels….
Read more at http://www.bbc.co.uk/news/science-environment-21941666

How the Large Hadron Collider is being repaired

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April 2, 2013 at 1:29 pm

Posted in High Energy Physics

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Charged Black Hole Remnants at the LHC

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black_holeG.L. Alberghi, L. Bellagamba, X. Calmet, R. Casadio, O. Micu
We investigate possible signatures of long-lived (or stable) charged black holes at the Large Hadron Collider. In particular, we find that black hole remnants are characterised by quite low speed. Due to this fact, the charged remnants could, in some cases, be very clearly distinguished from the background events, exploiting dE/dX measurements. We also compare the estimate energy released by such remnants with that of typical Standard Model particles, using the Bethe-Bloch formula….
Read more: http://arxiv.org/pdf/1303.3150v1.pdf

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March 16, 2013 at 2:14 pm

Posted in High Energy Physics

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LHC to stir up hot particle soup before 2013 shut down

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What happens when a proton smashes into a lead nucleus: a shower of particles through the CMS detector (Image: CERN)

What happens when a proton smashes into a lead nucleus: a shower of particles through the CMS detector (Image: CERN)

by Jacob Aron
At the foot of the misty mountains a mighty ring was forged – again! For one month, the Large Hadron Collider will smash two types of particles in a single magnetic ring.

So far, the LHC at CERN, near Geneva, Switzerland, has been colliding beams of identical types of particles, which are spun around the ring by a strong magnetic field. But starting in the third week of January it will smash protons into lead ions, in the hope of learning more about quark-gluon plasma. This is a hot soup of particles thought to make up the early universe.

Protons and lead ions have different masses and charges, so other colliders have used two magnetic rings to guide the beams. In the LHC, the beams will run in the same ring at slightly different speeds. “Nobody has ever run a collider quite like this before,” says CERN’s John Jowett.

Colour glass

Both beams circulate the LHC about 660,000 times a minute, but the proton beam goes slightly faster than the ion beam. “It’s as if you had a racetrack with a cyclist and a runner who have to bump into each other thousands of times at exactly four points,” says Paolo Giubellino of the ALICE experiment at CERN.

A successful test run last year has already thrown up surprises, including hints of a new form of matter known as colour-glass condensate. “It is an unexplained and very surprising feature and we very much wish to get more data to interpret it,” says Giubellino.

More data could help confirm the find, he says. The full-scale proton-lead ion runs will end in mid-February, when the collider shuts down for upgrades expected to last until late 2014

www.newscientist.com

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January 2, 2013 at 3:09 pm

Posted in High Energy Physics

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CERN’s LHC experiment ALICE, ITS Upgrade

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http://youtu.be/WMNrPatNKoU

ALICE New Silicon Tracker 3D Animation
This 3D animation, illustrates the design plans for the upgrade of the ALICE Inner Tracking System (ITS).The upgrade of the ITS will take place during the LHC long shutdown in 2017/18.

The ITS is the central most detector within ALICE, currently composed of three separate detectors (the Silicon Pixel Detector, the Silicon Drift Detector, and the Silicon Strip Detector) layered within two barrels around the LHC beam pipe.

This animation illustrates one of the design proposals for the upgraded ITS in three parts: firstly, the design of the CMOS sensor of the ITS silicon tracker and its assembly on carbon fibre staves; secondly, the assembly of the inner barrel; and thirdly, the assembly of the inner and outer barrels.

More about the ALICE detector:
http://alicematters.web.cern.ch/itsanimation

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December 15, 2012 at 2:37 pm

Posted in High Energy Physics

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LHC may have produced a previously undetected form of matter

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Teams at the Large Hadron Collider must be developing a knack for producing tangible evidence of theoretical particles. After orchestrating 2 million collisions between lead nuclei and protons, like the sort you see above, the collider’s Compact Muon Solenoid group and researchers at MIT suspect that stray, linked pairs of gluon particles in the mix were signs of color-glass condensate, a currently theory-only form of matter that sees gluons travel in liquid-like, quantum-entangled waves. The clues aren’t definitive, but they were also caught unexpectedly as part of a more routine collision run; the team is curious enough that it’s looking for more evidence during weeks of similar tests in January. Any conclusive proof of the condensate would have an impact both on how we understand particle production in collisions as well as the ways gluons and quarks are arranged inside protons. If so, the CMS and MIT teams may well answer a raft of questions about subatomic physics while further justifying CERN’s giant underground rings.
Read more: www.engadget.com

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November 28, 2012 at 9:45 pm

Posted in High Energy Physics

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The large hadron collider and the Higgs boson

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UCL lunch hour lecture

UCL runs a series of public lectures at lunchtime. On Tuesday I gave one of these, about the news from the energy frontier, including the discovery on the fourth of July this year. Here is the recording.

For the past two years, until the end of last month, I was convener of one of the big analysis groups at the ATLAS detector on the Large Hadron Collider at CERN, Geneva. This meant I was travelling a lot. So whenever I was asked to do something in London, I would say “not until October”.

So October has been predictably busy with engagements in the UK, often at UCL. As well as the debate on Monday, I gave one of our well-known public lunch hour lectures on Tuesday this week. We were full, some people were turned away, but it was live streamed and here is the recording in case you’d like to see it.


http://youtu.be/Z7YRDE4IG6w

There’s some overlap of material (especially jokes) with the Royal Institution evening discourse I gave in February. Except at UCL I didn’t have the demonstrations – but I did have a new boson!

guardian.co.uk

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October 25, 2012 at 10:09 am

Posted in High Energy Physics

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ATLAS Experiment: Search for dark matter candidates

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Search for dark matter candidates and large extra dimensions in events with a jet and missing transverse momentum with the ATLAS detector 
A search for new phenomena in events with a high-energy jet and large missing transverse momentum is performed using data from proton-proton collisions at sqrt(s)=7 TeV with the ATLAS experiment at the Large Hadron Collider. Four kinematic regions are explored using a dataset corresponding to an integrated luminosity of 4.7 inverse femtobarn. No excess of events beyond expectations from Standard Model processes is observed, and limits are set on large extra dimensions and the pair production of dark matter particles. http://arxiv.org/abs/1210.4491

Read more publications of the ATLAS collaboration at: twiki.cern.ch

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October 23, 2012 at 3:46 pm

Posted in DARK MATTER, High Energy Physics

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