What is Lhc: Definition and 327 Discussions

The Large Hadron Collider (LHC) is the world's largest and highest-energy particle collider. It was built by the European Organization for Nuclear Research (CERN) between 1998 and 2008 in collaboration with over 10,000 scientists and hundreds of universities and laboratories, as well as more than 100 countries. It lies in a tunnel 27 kilometres (17 mi) in circumference and as deep as 175 metres (574 ft) beneath the France–Switzerland border near Geneva.
The first collisions were achieved in 2010 at an energy of 3.5 teraelectronvolts (TeV) per beam, about four times the previous world record. After upgrades it reached 6.5 TeV per beam (13 TeV total collision energy, the present world record). At the end of 2018, it entered a two-year shutdown period for further upgrades.
The collider has four crossing points, around which are positioned seven detectors, each designed for certain kinds of research. The LHC primarily collides proton beams, but it can also use beams of heavy ions: lead–lead collisions and proton–lead collisions are typically done for one month per year. The aim of the LHC's detectors is to allow physicists to test the predictions of different theories of particle physics, including measuring the properties of the Higgs boson and searching for the large family of new particles predicted by supersymmetric theories, as well as other unsolved questions of physics.

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  1. rhody

    Atlas Experiment: CERN Video, link: All LHC Experiment docs

    First, the assembly, time lapsed of course... http://www.youtube.com/watch?v=kVrUR_SOykk&feature=related" This is a blow up of the Transition Radiation, Semi-conductor and Pixel Detectors, innermost Atlas detectors. Description of layers of detectors and what each one is...
  2. Jon Richfield

    Stany asked about LHC BH creation

    Moved from locked thread. Stany asked: 1: That was about creating mini black holes, not worm holes. 2: Although the maths was not provably impossible, it is not yet clear whether mini-black holes can be created in practice except by evaporation from not-so-mini BHs which is a SLOOOOOW...
  3. B

    Is there a black box recorder at the LHC?

    Is there a "black box recorder" at the LHC? To explain the question further: are there real-time records of exactly what's going on and/or voice recorders, analogous to what there are in commercial jets? If there were to be a major catastrophe at the LHC, they would need to know precisely what...
  4. P

    A few newbie questions about the LHC.

    Hello, I'm new here, and I guess I should give a brief intro.I'm in high school, and I have some interest in physics.A lot of it, in fact.I signed up because the fear mongering over the LHC led me to seek some answers, and I guess this is as good a place as any. Well, here goes: 1) What is...
  5. gabbagabbahey

    LHC Shutdown over fears of mini-white holes.

    I was checking the news this morning when I happened upon this shocking story: http://ste5ens.files.wordpress.com/2009/04/april-fool-illus.jpg
  6. DevilsAvocado

    CERN and Switzerland Prevail: Celebrating a Historical Moment!

    This is a historical moment – CERN and Switzerland did not turn into a Black Hole! :biggrin: Here are some pictures and video from the event: The two beams getting aligned for collision...
  7. Safinaz

    Maximizing Particle Detection at the LHC: The Role of Photons, Jets, and Leptons

    Hi all, Is it not preferable to detect a particle at the LHC with final states of photons, that when I read in many papers I find for example for a particle beyond SM like an octet scalars if they could decay into jets and photons+jets ( S^+ -> S^- A -> t b A), only jets channels take a...
  8. ryanuser

    Discoveries of the Large Hadron Collider

    So I did a search on google but couldn't Find what LHC has discovered more for past few years apart from Higgs Boson, can you name them and do a little description please. (Keep it simple please, understandable for high school student). Many thanks
  9. K

    Unexpected LHC Results Summary

    Is there a list for all unexpected LHC results from the start of operation that can't be explained by the standard model? Two years ago I remembered a result where they encountered unexpected macroscopic superposition akin to superconductivity.. where the particles dance together... anyone...
  10. H

    What's left over after particle collisions, like LHC?

    I'm curious to know what tends to be 'left over' after particle collisions at sites like LHC. I realize that many different particles may arise, depending on the types of particles used for collision, as well as the kinetic energy put into the experiments. Despite the amazing diversity of...
  11. B

    Understanding Relativistic Mass Increase at the LHC

    Homework Statement This is not really homework, I am trying to understand relativity and I suppose my question is too simple to post in other forums. I took the following data from the Cern site when they reached 7TeV: 2. Relevant data Ek = 7 Tev (1.6926*1027 Hz) B = 8.33 T RLch = 4243 00 cm...
  12. C

    Why was the LHC required to find the Higgs?

    If the Higgs is around 126 GeV, why was the LHC required to find it, when the Tevatron is capable of 1 TeV collisions and had already found the top quark which is quite a bit heavier? Is this because of something special about proton-proton collisions? Thanks! PS Please don't say "they did...
  13. J

    Are Cosmic Rays Impacting the LHC Measurements Beyond Muons?

    I've heard of cosmic rays affecting measurements made at the LHC in the context of muons. Is it just muons that can reach the detectors or is there background from other particles as well? Why are muons a background but not electrons? How significant is it? Thanks.
  14. marcus

    Beyond LHC without a machine (new physics from cosmic rays)

    Bee Hossenfelder has an interesting post I'd like to get some comment on http://backreaction.blogspot.com/2013/07/more-mysteries-in-cosmic-rays-and.html More mysteries in cosmic rays, and a proposed solution "...One mystery we already discussed previously. The “penetration depth” of the...
  15. T

    LHC and seeing (simulating) particles

    Sorry if this question is stupid, but how particles are simulated (seen) in the LHC like this https://www.youtube.com/watch?v=9SyNttacl4s does not that contradict with uncertainty principle ? Can we actually see particles ?
  16. I

    Why Only Protons were selected for collision in LHC project?

    Hi all, I would like to ask why only Protons were selected for collision in LHC project? Why not other fundamental particles? When I was watching the programme on big bang by Michio Kaku and Lawrence Krauss, they were saying at the earliest instant of big bang, there were four forces...
  17. mrspeedybob

    Applications of new physics which may be discovered at the LHC

    First off let me say that I am not interested in discussing whether the LHC is a worth while project. I believe human beings are curious by nature and that learning new things to satisfy that curiosity fulfills a human need just as real as any other. What I am interested in is discussing...
  18. S

    Higgsino at LHC, could it be seen?

    If there is super symmetric partner of the Higgs could it in principle be dectected at the lHc? if so what sort of decay products would be seen?
  19. F

    Contractors for LHC: Learn About CERN Turnarounds

    I have just been reading about the latest LHC shutdown and the upgrades and tests being carried out. I currently work in the oil & gas industry as an instrument designer having previously worked in petrochemical, pharmaceuticals, ammunitions manufacturing, food and beverage plus more. I like...
  20. P

    Could the LHC potentially form a black hole?

    Hey I heard from a couple differnt places on the internet that there's a possibility that a black hole hypothetically could be formed by the LHC. I thought that black holes were formed by the implosion of a huge star that keeps going in on itself due to gravity. Is it true that this could happen...
  21. Saitama

    Energy of relativistic particle in LHC

    Homework Statement (see attachment) The proton charge is ##1.6 \times 10^{-19} C## and the speed of light is ##3 \times 10^8 m/s##. The proton's mass is not necessary in this problem. Homework Equations The Attempt at a Solution The particle revolves in a circular path, hence...
  22. M

    Looking for LHC cost-benefit analysis video online

    If you've seen it, you'll know the one I'm referring to. It basically adds up the costs of labour and construction of the LHC, and compares it to the value in terms of education, PhDs produced, spin-off technologies, and multiplier effects. I can't find it anywhere on youtube or TED but I'm...
  23. krash661

    Hangout With Cern: Lhc And The Grid

    Hangout With CERN: LHC and the Grid - Big data, big questions Public · By CERN usually every thursday 5:00pm in UTC+01 http://hangouts.web.cern.ch/ http://youtube.com/CERNTV Last week we showed you how global computing helps CERN store, distribute and analysis around 25 Petabytes...
  24. A

    Does B^0 Meson Decay at LHC Rule Out Low-Energy SUSY?

    Does the decay of B0 meson into two muons at the 3 ppb level, imply that this test for low-energy SUSY has failed?
  25. K

    Understanding the LHC: A Beginner's Guide for Non-Scientists

    As a teacher, I've managed to get an in-depth visit to the LHC, but I haven't studied or taught anything to that level for a loooong time. Can anybody recommend an "idiots' guide" that will help me not look too dumb when I talk to the proper physicists there?
  26. Y

    Why a RHC antenna in Tx mode become LHC in receiving mode?

    How do you characterize an antenna in receiving mode? The book said a LHC antenna in transmitting mode is RHC in receiving mode. Also if the antenna is LHC in transmitting mode, it's transmission characteristic is defined as \hat {E}_{(z,t)}=\frac{\hat {x}+\hat {y} j}{\sqrt{2}}. But the same...
  27. U

    LHC and partical decay - time question -

    If time itself slows down near the speed of light, why don't they prove this by sending a particle which decays over a short period of time around the LHC and see if it decays at the same rate as a particle not moving around the LHC? Would this not prove that time really does slow down and...
  28. S

    Magnetic Field required to maintain protons at 7Tev in LHC

    Homework Statement Piece of homework I am stuck on. I have to calculate the magnetic field required to maintain protons at 7Tev in the LHC which has a radius of 27 km. I also have to work out the cyclotron frequency as well. Homework Equations 7 x 10^15 = mc^2/√(1-v^2/c^2) - mc^2...
  29. DiracPool

    Day to day logistics of what happens at the LHC

    Hello, I've done some research and can't seem to get a read on the day to day logistics of what happens at the LHC. Specifically, say with the ATLAS, do the researchers prepare a proton collision event at a specific day and time, and when that event is done, then spend the next few days or so...
  30. mesa

    Has the Large Hadron Collider Destroyed the World Yet?

    The web address is http: //www.hasthelargehaldroncolliderdesrtoyedtheworldyet.com http://hasthelargehadroncolliderdestroyedtheworldyet.com/ :)
  31. I

    Are Supersymmetric Inflation Models Still Viable After LHC's Latest Results?

    Does anybody know what is the status of supersymmetric inflation model after latest results of LHC concerning SUSY? Have some models been excluded? or do you know some review papers talk about that issue?
  32. R

    Could the LHC create a particle that would make Earth the size of a football?

    Dear readers for start thank you for your patience in readind this letter i was readind a book about higgs and in chapter 8 the author discribed this following event : as CERN was making its plans for the LHC public was worried for the security of the LHC One peoples fear was from...
  33. S

    Why So Large? Exploring the LHC's Size

    LHC why so large?? Hey I was wondering why the size of these particle smashers is important ? When they mention they send the particles around many times per second... why did it require such large size? Could they not build it smaller and just make it travel many more times in the...
  34. C

    In LHC collisions are protons aligned one-into-one?

    My understanding, please correct me if I am wrong, is that in the LHC proton-to-proton collision experiments it is technically not feasible to align protons directly into each other. Why is that and where can I look this up?
  35. S

    Why to create Higgs Boson in LHC ?

    Hi If the Higgs field is present everywhere then so should be the Higgs Boson right? Then why is a particle accelerator required. Cant it be just detected from around us? Salil
  36. F

    What would I see if there was a porthole in LHC's detectors?

    Question out of sheer curiosity: if there was a porthole in one of the LHC's detectors... would I see something? Like ghostly little sparks appearing out of nowhere, or would I be blinded by intense brightness? Also, I know the collision chambers are in vaccum, but say I went in there with a...
  37. M

    How can I find reliable sources of information on the LHC and its experiments?

    I'm sorry that this is probably in the wrong place, but I couldn't find a place to post where I am allowed to start threads which was relevant. I'm hopefully starting a degree in particle physics next year, I'm currently in my last year of high school. Myself and one other student at my...
  38. S.Daedalus

    Is the Quaternion Higgs the Particle Detected at the LHC?

    As everyone knows, since the fourth of July, the family of elementary particles has been re-united with its long-lost son, the Higgs boson. Of course, as every discovery, so this one, too, serves to open up further questions. The first one that presents itself is certainly: So, is this the...
  39. R

    What's Next for the LHC After the Discovery of the Higgs Boson?

    Now that the Higgs boson has been discovered, I am certain more runs will be made to confirm its existence and to increase the reliability of its ev measurement. When that is done, what will the LHC be used for next? Having done its job, will it be decommissioned?
  40. V

    Would a transversal beam of electrons increase the energy collision in the LHC?

    Hi All, Protons repel each other and in order to make them collide in the LHC huge amounts of energy have to be put in place, my question is; if we launch a beam of electrons transversal to the beam of protons and right in the collision point of the protons, would not this increase the energy...
  41. C

    So how will CERN's LHC detect a Higgs boson

    So how will CERN's LHC produce a Higgs boson I saw a video where a professor said "So you do it by ... using e=mc^{2} ... you collide some protons at huge energies, so that's giving you energy, and that energy gets converted into the mass of all possible new particles that there can be"...
  42. Greg Bernhardt

    LHC finds new Chi-b (3P) particle

    http://www.bbc.co.uk/news/science-environment-16301908
  43. C

    What is happening at the LHC books?

    "What is happening at the LHC" books? I am trying to find a Christmas gift for my brother, and thought it might be fun to try to get him a book that would be an introduction to what the LHC is looking for and would explain how to interpret the news coming out of the LHC in the last month / next...
  44. S

    Higgs search at LHC til December only?

    Do you believe in the news that by December if no Higgs were found. It is like there are really no Higgs because the search windows have been narrowed down already to no more gap by December 31? If there were no Higgs. What other tests or results can the LHC design to see that can explain...
  45. F

    No Higgs [at the LHC] - Anthem of a young theoretical physicist.

    Thought some people here might enjoy a little video we made: For context: Everybody involved in this project, in front of and behind the camera, is actually a theoretical physicist. This should obviously be taken as tongue in cheek, and it is not directed against string theory in...
  46. TrickyDicky

    Photon Pair Production Cross Sections at 7 TeV from CMS at LHC | LHC Preprint

    http://arxiv.org/abs/1110.6461 Abstract "The integrated and differential cross sections for the production of pairs of isolated photons is measured in proton-proton collisions at a centre-of-mass energy of 7 TeV with the CMS detector at the LHC. A data sample corresponding to an integrated...
  47. C

    Anyone here help out with the LHC@home sixtrack?I recently started

    Anyone here help out with the LHC@home sixtrack? I recently started and find it pretty neat, not really much to do apart from sit and watch results be processed, but knowing it is helping the LHC is a good feeling.
  48. B

    New Results From LHC/ light speed project

    Just wondering people's opinions if this is true? Is it enough evidence to conclude this (not yet obviously), but do you feel the evidence might be valid? Lastly what would be the implications if it was true? http://www.bbc.co.uk/news/science-environment-15017484 I was also...
  49. M

    LHC Experiments Challenge Speed of Light: 22nd Sept News

    "Speed-of-light experiments yield baffling result at LHC" - 22nd Sept News Article?! http://www.bbc.co.uk/news/science-environment-15017484 Came here to get some further information and I can't find a thread. If there already is one about this, sorry I should delete it. Very interesting...
  50. MTd2

    Signature of a higgselss/bootstrap model at LHC.

    I tried to ask Tommaso Dorigo and he doesn't know how to answer. So, it is something very non-conventional and so it suits this BSM forum. So, I ask you people, what would be the signature of a higgselss/bootstrap model at LHC?
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