Follow us : on US LHC Blogs Home Anti-proton to proton ratio ALICE’s 4th paper submitted Posted by Christine Nattrass on 29 Jun 2010 at 05:51 pm ALICE has just submitted its fourth paper on the anti-proton to proton ratio in p+p collisions , to Physical Review Letters . This is a really cool measurement because it is one way of quantifying how many of the particles we create in our collisions as opposed to how many of the particles we see are remnants of the . beam A proton has three valence quarks , two up quarks and one down quark . The proton’s electric charge is 1. An anti-proton has three valence anti-quarks , two anti-up quarks and one anti-down quark . The anti-proton’s electric charge is 1. The anti-proton is the proton’s anti-particle . When a proton and an anti-proton come
, Proton From Wikipedia , the free encyclopedia Jump to : navigation search For other uses , see Proton disambiguation Proton The quark structure of the proton . The color assignment of individual quarks is not important , only that all three colors are present . : Classification Baryon : Composition 2 up quarks 1 down quark Particle statistics Fermionic : Group Hadron Interaction Gravity Electromagnetic Weak Strong Symbol(s p p N Antiparticle Antiproton : Theorized William Prout 1815 : Discovered Ernest Rutherford 1919 Mass 1.672 6 21 6 37(83 10 27 kg 938.272 0 13(23 MeV c 2 1.007 2 76 4 66 7 7(10 u 1 Mean lifetime 2.1 10 29 yr stable Electric charge 1 e 1.602 1 76 4 87(40 10 19 C 1 Charge radius 0.877 fm 1 Electric dipole moment 5.4 10 24 e cm Electric polarizability 1.20(6 10 3 fm 3
, Antiproton From Wikipedia , the free encyclopedia Jump to : navigation search Negaton redirects here . For the negatively charged particle in an atom that was once called a negaton , see Electron Antiproton The quark structure of the . antiproton : Classification Antibaryon : Composition 2 up antiquarks 1 down antiquark Particle statistics Fermionic : Group Hadron Interaction Strong Weak Electromagnetic Gravity : Status Discovered Symbol(s p Particle Proton Mass 938 MeV c 2 Electric charge 1 e Spin 1 2 Isospin 1 2 Antimatter Annihilation Devices Particle accelerator Penning trap Wilson chamber Antiparticles Positron Antiproton Antineutron Uses Positron emission tomography Fuel Bodies ALPHA Collaboration ATHENA ATRAP CERN RHIC People Paul Dirac Carl David Anderson Andrei Sakharov v d e
, Annihilation From Wikipedia , the free encyclopedia Jump to : navigation search This article is about the quantum field theoretic process of particle–antiparticle annihilation . For other uses , see Annihilation disambiguation A Feynman diagram of a positron and an electron annihilating into a virtual photon which then decays back into a positron and an electron via Pair Production Annihilation is defined as total destruction or complete obliteration of an object 1 having its root in the Latin nihil nothing A literal translation is to make into nothing In physics the word is used to denote the process that occurs when a subatomic particle collides with its respective antiparticle 2 Since energy and momentum must be conserved , the particles are not actually made into nothing , but rather
, Baryon From Wikipedia , the free encyclopedia Jump to : navigation search Baryons are the family of composite particles made of three quarks as opposed to the mesons which are the family of composite particles made of one quark and one antiquark Both baryons and mesons are part of the larger particle family comprising all particles made of quarks—the hadrons The term baryon is derived from the Greek βαρύς barys meaning heavy because at the time of their naming it was believed that baryons were characterized by having greater masses than other . particles Until very recently , it was believed that some experiments showed the existence of pentaquarks exotic baryons made of four quarks and one . antiquark 1 2 The particle physics community as a whole did not view their existence as likely
Follow us : on US LHC Blogs Home On the border Posted by Mike Anderson on 27 Jun 2010 at 12:53 pm The LHC ring crosses the France Switzerland border in something like 6 places . Unfortunately , since Switzerland isn’t in the EU , one needs to have both Euros and Swiss Francs when working and living near CERN . The main site is just barely in Switzerland , while several other CERN sites are in France . For example , our detector , CMS , is about 8 miles into . France Vending machines do not take more than once kind of currency . Also , border guards don’t take kindly to bringing wine or meat across the . border As for the American dollars , I only happened to have those because I recently traded euros to someone who was moving to France permanently , while I was going back to the US withinFollow us : on US LHC Blogs Home On the border Posted by Mike Anderson on 27 Jun 2010 at 12:53 pm The LHC ring crosses the France Switzerland border in something like 6 places . Unfortunately , since Switzerland isn’t in the EU , one needs to have both Euros and Swiss Francs when working and living near CERN . The main site is just barely in Switzerland , while several other CERN sites are in France . For example , our detector , CMS , is about 8 miles into . France Vending machines do not take more than once kind of currency . Also , border guards don’t take kindly to bringing wine or meat across the . border As for the American dollars , I only happened to have those because I recently traded euros to someone who was moving to France permanently , while I was going back to the US within
I am presently in Japan, participating in the Gravity and Cosmology workshop at the Yukawa Institute for Theoretical Physics on the Kyoto University campus. The big news here is that the Large Cryogenic Gravitational-wave Telescope (LCGT) was just approved for funding! I believe that this is the press release, as witnessed by the exclamation mark [...]
Scientists working at the Large Hadron Collider have expressed concern after new audio recognition s
Today, while waiting for files to render and cuts to be approved, I spent some time bouncing around 
God particle also called the Higgs boson One of objectives of the 27 KM in circumference Large Hadro
All matter is made up of atoms, and atoms are made of electrons, neutrons, and protons. Peter Higgs 
Huh. Weird. I thought they said there are probably like five, so if that is the case, do they plan 
The idea that a preference in meson decays for matter over antimatter could point to a whole world of unseen particles, including multiple Higgs bosons, just got a blessing.
Like another neutrino result earlier this week, the MiniBooNE experiment has found that antineutrinos, which should follow the same rules as neutrinos, might oscillate in a slightly different way. The results seem to favor a much-debated antineutrino result obtained by the Liquid Scintillator Neutrino Detector experiment in 1990.
Forty-odd Chicagoans gathered in a bar on June 3, not to watch the Blackhawks in the Stanley Cup finals, but to hear Jason St. John talk about particle colliders, the Standard Model and how the Large Hadron Collider won’t be the end of us all. His lecture was part of Chicago’s inaugural Nerd Nite, a monthly series of informal talks intended to educate and entertain the community’s “lay nerds,” as St. John describes them, while they kick back with beers and martinis. 
(BBC News) – The idea of multiple Higgs bosons is supported by results gathered by the DZero e
A new measurement from the MINOS neutrino experiment today announced an unexpected variance in a property of neutrinos versus antineutrinos. This mass difference parameter, called Δm2 (“delta m squared”), is smaller by approximately 40 percent for neutrinos than for antineutrinos.
During last week's Physics at LHC conference, textbooks were being literally rewritten as experimental particle physicists presented their remeasurements of the data contained in the particle data booklet, which contains all possible data for all existing and hypothetical particles. One theorist presented his prediction for a page from the 2016 version of the booklet.
You can read a bit about the work of my colleague Elena Pierpaoli and her postdocs and students in this article in one of USC's in-house publications. It focuses on the Planck observatory (image right from NASA/ESA), which we've discussed here before. (Recall the launch?) There's a lot of exciting physics about the very young universe to be discovered as more data from the mission get gathered and analyzed.
Enjoy the article!
-cvj
The Large Hadron Collider's beam brightness has steadily increased over the past two and a half months. It currently takes a minute to see as many collisions as we used to see in a day. Very soon, the same number of collisions will take seconds. 
I linked to this on Twitter, where people enjoyed it. Don’t want folks who are still stuck in 2008 and only reading the blog to miss out. Abstruse Goose, click for legible original:
Tom Whyntie points out that the rabbit should really be more spherical.
Follow us : on US LHC Blogs Home Neutrinos Posted by Flip Tanedo on 06 Jun 2010 at 02:22 pm Time for another dose of particles for the people eh , working title In previous installments Part 1 Part 2 Part 3 Part 4 we started a basic theory QED electrons and photons and added on muons , taus , and the Z boson . Now we’re going to add on a set of particles that have recently made some news , the neutrino Here’s the Particle Zoo s depiction of an electron-neutrino There are , in fact , three types of neutrino : one to pair with each of our electron-like particles . Thus in addition to the electron-neutrino , we also have the muon-neutrino and the tau-neutrino . As their name suggests , neutrinos are neutral and have no electric charge . Further , they’re extremely . light The fact that
It's been just over two months since the first high-energy proton collisions took place in the Large Hadron Collider, and scientists from the LHC experiments have been working feverishly to analyze the data now pouring from their detectors. The results of the first analyses using real LHC data are being presented this week at the "Physics at LHC" conference at the DESY laboratory in Hamburg, Germany. Follow us : on US LHC Blogs Home Neutrinos Posted by Flip Tanedo on 06 Jun 2010 at 02:22 pm Time for another dose of particles for the people eh , working title In previous installments Part 1 Part 2 Part 3 Part 4 we started a basic theory QED electrons and photons and added on muons , taus , and the Z boson . Now we’re going to add on a set of particles that have recently made some news , the neutrino Here’s the Particle Zoo s depiction of an electron-neutrino There are , in fact , three types of neutrino : one to pair with each of our electron-like particles . Thus in addition to the electron-neutrino , we also have the muon-neutrino and the tau-neutrino . As their name suggests , neutrinos are neutral and have no electric charge . Further , they’re extremely . light The fact that
: 1 June 2010 2010 The Particle Zoo , LLC
, Super-Kamiokande From Wikipedia , the free encyclopedia Jump : to navigation search The inner detector region of Super-K Super-K redirects here . For the record company , see Super K Productions Super-Kamiokande full name as Super-Kamioka Nucleon Decay Experiments or abbreviated to Super-K for short , is a neutrino observatory which is underground of Mountain Kamiokakō near the city of Hida Gifu Prefecture Japan The observatory was designed to search for proton decay study solar and atmospheric neutrinos and keep watch for supernovas in the Milky Way Galaxy The Super-K is located 1,000 m 3,281 ft underground in Kamioka Mining and Smelting . Co s Mozumi Mine in Hida's Kamioka area . It consists of a cylindrical stainless steel tank that is 41.4 m 135.8 ft tall and 39.3 m 128.9 ft in
, Solar neutrino problem From Wikipedia , the free encyclopedia Jump : to navigation search Solar neutrino problem Discrepancies in the measurements of actual solar neutrino types and what the Sun's interior models . predict Former Standard Model Neutrinos should have been massless according to the then-accepted theory this means that the type of neutrino would be fixed when it was produced . The Sun should emit only electron neutrinos as they are produced by H–He . fusion Observation Only one third to one half of predicted number of electron neutrinos were detected neutrino oscillation explains the difference but requires neutrinos to have . mass Resolutions Neutrinos have mass and so can change . type The solar neutrino problem was a major discrepancy between measurements of the numbers
Follow us : on US LHC Blogs Home Wrapping up another owl shift Posted by Mike Anderson on 05 Jun 2010 at 10:51 pm It’s 5:45am , and my shift doesn’t end for another hour at . 7am We were so close to getting to record some more collision data during this shift , only for the beam to be dumped due to some problems . I’ll have to ask experts to see what a 1 3 resonance” . means Hopefully they’ll have more luck during the morning and afternoon shift so that by the time I’m on shift again at 11pm I’ll get to watch more data being taken in . person 1 Comment One Response to Wrapping up another owl shift” on 06 Jun 2010 at 9:26 am Anders L When they talk about a 1 3 resonance , they mean that the tune of the beam hits the 1 3 resonance . This means that after 3 circulations the particles in theFollow us : on US LHC Blogs Home Wrapping up another owl shift Posted by Mike Anderson on 05 Jun 2010 at 10:51 pm It’s 5:45am , and my shift doesn’t end for another hour at . 7am We were so close to getting to record some more collision data during this shift , only for the beam to be dumped due to some problems . I’ll have to ask experts to see what a 1 3 resonance” . means Hopefully they’ll have more luck during the morning and afternoon shift so that by the time I’m on shift again at 11pm I’ll get to watch more data being taken in . person 1 Comment One Response to Wrapping up another owl shift” on 06 Jun 2010 at 9:26 am Anders L When they talk about a 1 3 resonance , they mean that the tune of the beam hits the 1 3 resonance . This means that after 3 circulations the particles in the
Follow us : on US LHC Blogs Home The crossroads of particle physics Posted by Ken Bloom on 05 Jun 2010 at 10:20 pm Particle physicists come from all over the world to eat at CERN’s Restaurant 1. Actually it is more accurate to say that they come from all over the world and eat at R1, but that doesn’t change the fact that at any mealtime there , it seems like you can run into just about anyone in particle physics . This is why some people prefer to eat at Restaurant 2. When I’ve visited CERN , I’ve enjoyed happening upon all sorts of friends and acquaintances from my twenty years as a working particle physicist . Some I collaborated with years ago and haven’t seen in a long time others are fellow CMS members who I just didn’t know were also going to be in town that . week That being said ,
, , Skip to main . content Search SLAC WEB PEOPLE Detailed Index Home Organizational Charts Staff Emeriti Directors All Hands Memos Initiatives Organizational Charts Directorate Accelerator Directorate LCLS Operations Particle Physics and Astrophysics Photon Science SSRL Persis Drell Director Persis S . Drell is Professor and Director at SLAC . She received her B.A . in mathematics and physics from Wellesley College in 1977. She received her Ph.D . in atomic physics from the University of California , Berkeley , in 1983. She then switched to high-energy experimental physics and worked as a postdoctoral scientist with Lawrence Berkeley National Laboratory . She joined the faculty of the Physics Department at Cornell University in 1988. In 2000, she became head of the Cornell high-energyFollow us : on US LHC Blogs Home The crossroads of particle physics Posted by Ken Bloom on 05 Jun 2010 at 10:20 pm Particle physicists come from all over the world to eat at CERN’s Restaurant 1. Actually it is more accurate to say that they come from all over the world and eat at R1, but that doesn’t change the fact that at any mealtime there , it seems like you can run into just about anyone in particle physics . This is why some people prefer to eat at Restaurant 2. When I’ve visited CERN , I’ve enjoyed happening upon all sorts of friends and acquaintances from my twenty years as a working particle physicist . Some I collaborated with years ago and haven’t seen in a long time others are fellow CMS members who I just didn’t know were also going to be in town that . week That being said ,
Follow us : on US LHC Blogs Home On Trigger Shift Posted by Mike Anderson on 04 Jun 2010 at 07:14 pm I’m currently in the CMS control room doing Trigger shift . The Trigger’ is what selects interesting events to record . Unfortunately , there is nothing interesting being recorded at the moment because , as you can see on the LHC status page , currently access is required to work on the Quench Protection System” in a specific . sector So , I’ll keep watching the trigger recording cosmic ray muons , making sure things stay looking . ok In the meantime I can keep working on a paper we’d like to have a draft of by . Monday 1 Comment One Response to On Trigger Shift” on 04 Jun 2010 at 7:49 pm Harbles Dude Tell me what you can about the cmstv Daq status page There are 11 pages on there with aFollow us : on US LHC Blogs Home On Trigger Shift Posted by Mike Anderson on 04 Jun 2010 at 07:14 pm I’m currently in the CMS control room doing Trigger shift . The Trigger’ is what selects interesting events to record . Unfortunately , there is nothing interesting being recorded at the moment because , as you can see on the LHC status page , currently access is required to work on the Quench Protection System” in a specific . sector So , I’ll keep watching the trigger recording cosmic ray muons , making sure things stay looking . ok In the meantime I can keep working on a paper we’d like to have a draft of by . Monday 1 Comment One Response to On Trigger Shift” on 04 Jun 2010 at 7:49 pm Harbles Dude Tell me what you can about the cmstv Daq status page There are 11 pages on there with a
Follow us : on US LHC Blogs Home The SnarXiv Posted by Flip Tanedo on 02 Jun 2010 at 10:08 pm Before I explain anything , consider the following two screen : shots The first image comes from the arXiv.org archive” the official pr e-print server for papers in fields such as physics , mathematics , and computer science . The second image comes from a the snarXiv a delightful parody by a friend and colleague of mine , David Simmons-Duffin a high energy theory grad student at . Harvard The snarXiv is a game of computer-generated mad libs” that presents intelligently-constructed abstracts for hep-th high energy physics : theory papers . It’s a little more sophisticated than filling-in-the-blanks—as David explains on his blog but the punchline is that these fake” abstracts often sound like
David Simmons-Duffin David is currently a 3 rd year Ph.D . student at Harvard studying theoretical high energy physics . He's interested in anything that involves Quantum Field Theory , including Phenomenology , String Theory , and the interplay between the two . Education Ph.D . in theoretical physics , Harvard 2007-present , in progress Certificate of Advanced Study in Mathematics Cambridge University 2007. . A.B . A.M Harvard University 2006. Information Publications Miscellaneous Personal website Fun physics-related writing Quire Cleveland Python module for Lie algebra computations Contact email dav REMOVETHISTEXT idsd phys ics.ha rva rd.edu address 17 Oxford Street Cambridge , MA 02138, USAFollow us : on US LHC Blogs Home The SnarXiv Posted by Flip Tanedo on 02 Jun 2010 at 10:08 pm Before I explain anything , consider the following two screen : shots The first image comes from the arXiv.org archive” the official pr e-print server for papers in fields such as physics , mathematics , and computer science . The second image comes from a the snarXiv a delightful parody by a friend and colleague of mine , David Simmons-Duffin a high energy theory grad student at . Harvard The snarXiv is a game of computer-generated mad libs” that presents intelligently-constructed abstracts for hep-th high energy physics : theory papers . It’s a little more sophisticated than filling-in-the-blanks—as David explains on his blog but the punchline is that these fake” abstracts often sound like
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, Follow us : on US LHC Blogs Home Physics buildings , then and now Posted by Ken Bloom on 30 May 2010 at 10:25 pm My recent travels to CERN , and the long plane trips required , have finally allowed me to catch up on my back copies of Physics Today the monthly magazine published by the American Institute of Physics I particularly enjoyed the April issue One feature article was about the origin of the term and concept of phase space . I should probably leave it for Flip to explain this , but phase space gives us a way to simultaneously visualize the spatial configuration and the momentum of a physical system . Just how it became a space” and why there is a phase” associated with it turns out to be an interesting story . There was also an article on spintronics an emerging field that
Theorists say the discovery of a significant imbalance between the production of matter and antimatter during particle collisions at the Tevatron points to new physics at work -- including the possibility that there may be five types of Higgs boson, rather than just one. , Follow us : on US LHC Blogs Home Physics buildings , then and now Posted by Ken Bloom on 30 May 2010 at 10:25 pm My recent travels to CERN , and the long plane trips required , have finally allowed me to catch up on my back copies of Physics Today the monthly magazine published by the American Institute of Physics I particularly enjoyed the April issue One feature article was about the origin of the term and concept of phase space . I should probably leave it for Flip to explain this , but phase space gives us a way to simultaneously visualize the spatial configuration and the momentum of a physical system . Just how it became a space” and why there is a phase” associated with it turns out to be an interesting story . There was also an article on spintronics an emerging field that
The Large Hadron Collider at CERN We don’t often get to talk about particle physics at the Tru
Large Hadron Collider Subscribe via iTunes | Download mp3 | Podcast feed URL Though few of us unders
If you have not read the article “The Breaking of Ouroborus” by Cyprium, i recommend beg
“In a mathematically perfect universe, we would be less than dead; we would never have existed
Follow us : on US LHC Blogs Home The Z boson and resonances Posted by Flip Tanedo on 10 May 2010 at 09:55 pm Hello everyone Let’s continue our ongoing investigation of the particles and interactions of the Standard Model . For those that are just joining us or have forgotten , the previous installments of our adventure can be found at the following links : Part 1 Part 2 Part 3 Up to this point we’ve familiarized ourselves the Feynman rules—which are shorthand for particle content and interactions—for the theory of electrons and photons quantum electrodynamics , or QED We then saw how the rules changed if we added another electron-like particle , the muon μ . The theory looked very similar : it was just two copies of QED , except sometimes a a high-energy electron and positron collision
It’s been a leeettle while, but continuing on from my LHC I post, I’m here to give you s
CERN It’s time for physics at the LHC: http://ow.ly/1Fevm … as the machine continues to