Archive for Higgs
Barcelona acoge un congreso internacional sobre la Física del LHC
Barcelona acogerá desde el 13 al 18 de mayo la conferencia internacional Large Hadron Collider Physics (LHCP 2013), organizada por el Institut de Física d’Altes Energies (IFAE). Este congreso reunirá a más de 300 científicos expertos en física de partículas, tanto a nivel teórico como experimental, para debatir los avances y resultados más recientes en este campo, principalmente aquellos obtenidos por los experimentos del Large Hadron Collider del CERN (Laboratorio Europeo de Física de Partículas). El congreso LHCP es el resultado de la unión de dos grandes y prestigiosos congresos internacionales: el Physics at Large Hadron Collider y el Hadron Collider Physics Symposium.
Entre los científicos participantes asistirán Sergio Bertolucci, director de Investigación y Computación del CERN; Tatsuya Nakada, portavoz del experimento LHCb (Large Hadron Collider Beauty Experiment) del CERN durante más de una década y presidente de ECFA (European Committee for Future Accelerators); y Joseph Lykken, del departamento de Física Teórica de Fermilab, conocido por sus aportaciones a la teoría de supercuerdas.
Uno de los temas principales de la conferencia será el estudio de las características del bosón de Higgs, para intentar dilucidar si es el bosón de Higgs del Modelo Estándar de Física de Partículas o si corresponde al más ligero de una serie de bosones predichos en algunas teorías que van más allá de este modelo.
Entre los eventos sociales más importantes de la reunión, la conferencia tendrá una recepción el día 13 de mayo en el Ayuntamiento de Barcelona a cargo del teniente de alcalde Jaume Ciurana, así como una charla de divulgación abierta a todo el público titulada "La búsqueda del bosón de Higgs en el LHC: una perspectiva histórica", a cargo de Tejinder Virdee, del Imperial College de Londres, que se celebrará el día 16 de mayo a las 19 horas en CosmoCaixa.
Filed under: Acelerador de particulas,Big Bang,CERN,Ciencia,Cosmologia,CPAN,CSIC,Cuántica,Fisica,Fisica de alta energia,Fisica de particulas,Fisica Nuclear,Fisica Teorica,Higgs,LHC,Science |
| Antimateria, antimatter, Astrofisica, CERN, Ciencia, Cosmologia, cpan, CSIC, Cuántica, Fisica, Fisica de particulas, Fisica Nuclear, Fisica Teorica, LHC, Matematicas, Materia Oscura, Mecanica cuantica, Science|No Comments
El Higgs sugiere un universo metaestable
Según algunos estudios un Higgs de 126 GeV/c2 daría lugar a un universo metaestable.
http://myfileshared.com.es/videos/15/boson-de-higgs-1
http://myfileshared.com.es/videos/16/boson-de-higgs-2
Los últimos resultados publicados por el CERN parecen confirmar la existencia del bosón de Higgs, cuyo descubrimiento se anunció hace unos meses. El Higgs descubierto tiene una masa de 126 GeV/c2. Sin embargo, no se descarta que existan otros bosones de Higgs más pesados. Incluso a la energía a la que ha operado el LHC se podrían crear esas versiones más pesadas del Higgs, pero la estadística no es buena de momento. Una vez se actualice este acelerador y opere a mayor energía quizás se puedan descubrir esas partículas, o no.
Filed under: Acelerador de particulas,Astrofisica,Atlas experiment,Atomo,Big Bang,CDF experiment,CERN,Ciencia,CMS experiment,Cosmologia,Cuántica,Dzero,Fermilab,Fisica,Fisica de alta energia,Fisica de particulas,Fisica Nuclear,Fisica Teorica,Higgs,Investigacion,LHC,Matematicas,Materia,Mecanica cuantica,Modelo Estandar,Science,Universo |
| Astrofisica, Atlas, CERN, Ciencia, CMS, Cosmologia, Fermilab, Fisica, Fisica de particulas, Fisica Nuclear, Fisica Teorica, Higgs, Investigacion, LHC, Matematicas, Mecanica cuantica, Science, Tevatron, Universo|No Comments
The Substandard Model of Particle Physics
Now that we are on the verge of completing the Standard Model of Particle Physics, it’s time to look to the future of the field. Five physicists at CERN present their new state of the art* theory: The Substandard Model of Physics!
“It’s easy to understand but questionably accurate.” Mandy Baxter (Marine Biogeochemical Microbiologist, USCB)
Thanks to the actors.
The Substandard Model Task Force:
Androula Alekou (Neutrino Expert)
Katie Malone (Higgs Expert)
Stephen Ogilvy (Flavor Expert)
Aidan Randle-Conde (QCD Expert)
Lee Tomlinson (QFT Expert)
Steve Marsden (Standard Model Expert)
Helen Lambert (Environmental Sanitization Team)
You can find Steve and Aidan on youtube and twitter:
http://www.youtube.com/signifyingsomething
http://www.youtube.com/aidanatcern
@sigsome @aidanatcern
Visit the US LHC Blogs at Quantum Diaries:
http://www.quantumdiaries.org/lab-81
Music: Off to Osaka, Kevin Macleod, http://www.incompetech.com
Images taken from CKMFitter (http://ckmfitter.in2p3.fr), UTFit (http://www.utfit.org), Wikimedia.
This video does not reflect the views of CERN. It does not even reflect the views of the actors. In fact I’d be surprised if it reflected the views of anyone at all.
Thanks to Adam Davidson for inspiring the name. It was a off handed comment you made about 7 years ago that stuck with me ever since. Finally it has become a reality!
Apologies for the slightly out of focus footage and extra frame. Some small technical glitches always get through.
(*We’re just not sure what kind of a state, and what kind of art it is.)
Filed under: Ciencia,Higgs,Science |
| STANDARD MODEL|No Comments
New ATLAS 3D movie (in 2D)
Produced by: ATLAS OUTREACH
10:00 min. / 09 October 2012 / © 2012 CERN
http://cds.cern.ch/record/1483758
ATLAS 3D MOVIE © 2012 CERN
Produced by: ATLAS
Director: Neal Hartman
Director: Claudia Marcelloni
5:00 min. / 01 January 2012 / © 2012 CERN
http://cds.cern.ch/record/1514547
Filed under: Acelerador de particulas,Atlas experiment,Big Bang,CERN,Cuántica,Fisica,Fisica de alta energia,Fisica de particulas,Fisica Nuclear,Fisica Teorica,Higgs,LHC,Science |
| Astrofisica, Atlas, CERN, Ciencia, Cosmologia, Fisica, Fisica de particulas, Fisica Nuclear, Fisica Teorica, LHC, Mecanica cuantica, Science|No Comments
Los proyectos más avanzados para un acelerador de partículas lineal unen sus fuerzas
Los dos proyectos más avanzados para construir el futuro acelerador lineal de partículas, ILC y CLIC, se unen en una iniciativa conjunta. Mediante esta unión, formalizada ayer en una conferencia en el laboratorio TRIUMF de Vancouver (Canadá), la comunidad científica internacional coordinará esfuerzos para desarrollar el acelerador lineal, instrumento complementario al LHC que profundizará en sus descubrimientos, especialmente el bosón de Higgs.
Los proyectos ILC (International Linear Collider) y CLIC (Compact Linear Collider study) han formado la nueva Colaboración para el Acelerador Lineal (Linear Collider Collaboration), organización que coordinará e impulsará el desarrollo global para el acelerador lineal. Esta nueva organización está dirigida por Lyn Evans, que fue el responsable de la construcción del LHC en el CERN. Hitoshi Murayama, director del Instituto Kavli, será el director adjunto.
http://www.youtube.com/embed/H7NgJmaFlio
Fly through the International Linear Collider (ILC) and find out how it works. The ILC will collide electrons and their antiparticles, positrons, in a 30-kilometre-long straight tunnel. In the clip lasting just over one minute, follow the particles running through all the different subsystems, the beam pipes, superconducting accelerating cavities and finally into collision at the interaction region, where they spray out into the different layers of a large particle detector. After an overview of the scale of the ILC, a short schematic in the beginning explains the general layout: electrons are produced in the electron source, some of them in turn produce the positrons that they will later collider with. So-called damping rings that make sure that the beams have the right properties, and in two linear accelerators that face each other electrons and positrons are accelerated until they reach collision energies of 0.5 TeV and collide in the middle of the two accelerators. Find out more about the project and it status at www.linearcollider.org/about
También se ha constituido un nuevo comité de expertos para el acelerador lineal, encabezado por Sachio Komamiya de la Universidad de Tokio, cuyos miembros son designados por el Comité Internacional para Futuros Aceleradores (ICFA, por sus siglas en inglés).
“Ahora que el LHC ha alcanzado su primer y estimulante descubrimiento, estoy ansioso por contribuir al próximo proyecto”, dijo el director de la Colaboración para el Acelerador Lineal Lyn Evans. “Soy un constructor de aceleradores, y, con el fuerte apoyo que el ILC recibe de Japón, la Colaboración para el Acelerador Lineal puede utilizar las tuneladoras para construir una factoría de Higgs en Japón, a la vez que desafiamos las fronteras de la tecnología con CLIC”. “Los dos proyectos, ILC y CLIC, tienen objetivos similares, pero usan tecnologías muy distintas, que están en diferentes estados de desarrollo”, explicó Sachio Komamiya.
Estructura
La nueva Colaboración para el Acelerador Lineal tiene tres secciones principales, que reflejan las áreas de investigación que continuarán desarrollándose. La sección del ILC será liderada por Mike Harrison (Laboratorio Nacional de Brookhaven, EE.UU.); la sección de CLIC está dirigida por Steinar Stapnes (CERN), y la sección de Física y Detectores la liderará Hitoshi Yamamoto (Universidad de Tohoku).
Para el ILC, que publicará su Technical Design Report (documento técnico de diseño) el próximo mes de junio, los esfuerzos se centran en preparar su posible construcción, al tiempo que realiza avances en tecnologías de aceleradores y optimización del diseño.
Read more »» Los proyectos más avanzados para un acelerador de partículas lineal unen sus fuerzas
Filed under: Acelerador de particulas,Antimateria,Antimatter,Big Bang,Ciencia,CLIC,Cosmologia,CPAN,CSIC,Cuántica,Dark energy,Dark matter,Fisica,Fisica de alta energia,Fisica de particulas,Fisica Nuclear,Fisica Teorica,Higgs,ILC,International Lineal Collider,LeHC,LEP,LHC,LHeC,Materia,Mecanica cuantica,Modelo Estandar,Science,Sincrotrón,Supersimetria,SUSY |
| Astrofisica, CERN, Ciencia, CLIC, Cosmologia, cpan, CSIC, Cuántica, Fermilab, Fisica, Fisica de particulas, Fisica Nuclear, Fisica Teorica, ILC, Matematicas, Materia Oscura, Mecanica cuantica, Science|No Comments
Demystifying the Higgs Boson with Leonard Susskind
Professor Susskind presents an explanation of what the Higgs mechanism is, and what it means to "give mass to particles." He also explains what's at stake for the future of physics and cosmology.
Stanford University:
http://www.stanford.edu/
Filed under: Ciencia,Cosmologia,Fisica,Fisica de alta energia,Fisica de particulas,Higgs,Science,Universidad |
| Ciencia, Cosmologia, Fisica, Fisica de particulas, Fisica Teorica, Higgs, Leonard Susskind, Science, Stanford|No Comments
Higgs update, HCP 2012
Last week, Seth and I met up to discuss the latest results from the Hadron Collider Physics (HCP) Symposium and what they mean for the Higgs searches. We have moved past discovery and now we are starting to perform precision measurements. Is this the Standard Model Higgs boson, or some other Higgs boson? Should we look forward to a whole new set of discoveries around the corner, or is the Higgs boson the final word for new physics that the LHC has to offer? We’ll find out more in the coming months!
Filed under: CERN,Ciencia,Higgs,LHC,Science |
| Atlas, CMS|No Comments
El aspirante a bosón de Higgs parece encajar con los modelos estándar
La nueva partícula elemental cuyo descubrimiento fue proclamado en julio pasado podría ser un poco menos trascendental de lo que esperaban los científicos.
En una conferencia en Kioto (Japón) donde se presentaron los últimos datos de su Gran Colisionador de Hadrones (LHC, por sus siglas en inglés), científicos del centro europeo de investigaciones CERN dijeron que parece muy probable que la partícula sea efectivamente el buscado bosón de Higgs, que da masa a la materia.
Pero en lugar de un animal exótico que abre la puerta a nuevas realidades de la cosmología, como algunos esperaban, los datos indican que más es un "modelo estándar de Higgs" que encaja en el concepto científico actual del universo, señalaron.
Read more »» El aspirante a bosón de Higgs parece encajar con los modelos estándar
Filed under: Acelerador de particulas,Astrofisica,Atlas experiment,Atomo,Big Bang,CERN,Ciencia,CMS experiment,Cosmologia,Cuántica,Fisica,Fisica de alta energia,Fisica de particulas,Fisica Nuclear,Fisica Teorica,Higgs,LEP,LHC,Matematicas,Materia,Mecanica cuantica,Modelo Estandar,Science |
| Astrofisica, Atlas, CERN, Ciencia, CMS, Cosmologia, Fisica, Fisica de particulas, Fisica Nuclear, Fisica Teorica, Higgs, LHC, Matematicas, Mecanica cuantica, Science|Comments off
Le mystère plane toujours sur le boson de Higgs
Depuis la découverte en juillet dernier de ce qui pourrait être le boson de Higgs, les physiciennes et physiciens des expériences CMS et ATLAS essaient de trouver sa véritable identité. Est-ce vraiment le boson de Higgs prédit par le modèle standard de la physique des particules ou une autre type de boson de Higgs relié à une théorie différente ?
Pour en avoir le cœur net, nous devons vérifier toutes ses propriétés, par exemple comment et dans quelles proportions il se désintègre. On doit aussi établir son spin et sa parité, deux propriétés des particules fondamentales.
Le nouveau boson a une courte durée de vie, il se désintègre tout de suite après avoir été créé. Il peut alors se briser de cinq façons différentes observables au Grand Collisionneur de Hadrons (LHC): en produisant deux photons, deux bosons Z ou W, deux quarks b ou encore deux leptons taus (une particule semblable à l’électron mais 3500 fois plus lourd). Il nous faut établir si chaque mode de désintégration existe et s’il se produit au taux prévu.
L’été dernier, lors de l’annonce de sa découverte, les deux expériences n’avaient des résultats clairs que pour les trois premiers modes. L’échantillon de données était alors trop petit pour voir des désintégrations en une paire de quarks b ou de taus.
Avec maintenant plus de données, les deux expériences ont pu montrer des résultats dans tous les canaux à une conférence aujourd’hui à Kyoto comme on peut le voir sur les graphes ci-dessous. La figure de gauche montre les résultats de CMS et celle de droite, ceux d’ATLAS. 
Les valeurs de “? ? ?SM” et “?” sont équivalentes et représentent le rapport entre ce qui est observé et ce que le modèle standard prévoit. Une valeur de 1 signifie que tout concorde avec la théorie, et zéro implique que ce canal de désintégration n’est pas observé. Toute autre valeur implique que l’on voit ce canal mais qu’il se produit à un taux différent de celui auquel on s’attendait. Il faut bien sûr tenir compte des marges d’erreur avant de tirer une quelconque conclusion.
Les deux expériences ont maintenant des résultats pour les canaux de désintégrations en paires de quarks b ou en taus et les marges d’erreurs sont réduites pour plusieurs canaux. Pour l’instant, CMS obtient une valeur combinée de 0.88 ± 0.21 tandis qu’ATLAS mesure 1.3 ± 0.3. Les deux mesures sont donc compatibles avec 1.
La présence de ces cinq canaux serait compatible avec un boson de spin 0. Si en plus les taux de désintégration correspondent, ce nouveau boson aurait de plus en plus l’air du boson de Higgs mais ce ne serait toujours pas suffisant. Il faudra aussi qu’il soit de parité positive, comme le prédit le modèle standard.
Le spin d’une particule fondamentale réfère à sa rotation sur elle-même. La parité est reliée à ce qui arrive quand on inverse une direction dans l’espace. Voit-on la même chose lorsqu’on l’observe directement ou à travers un miroir quand la droite et la gauche sont inversées? Les particules possédant une parité positive agissent de la même façon qu’on les regarde directement ou dans un miroir.
On peut déterminer la parité d’une particule en observant la direction prise par ses débris quand elle se désintègre. Dépendamment de sa parité, ils s’éloigneront de préférence dans une direction plutôt qu’une autre. Par exemple, CMS a mesuré les angles entre les quatre électrons ou muons produits quand un boson se désintègre d’abord en deux bosons Z, eux-mêmes donnant une paire d’électrons ou de muons. Puis ils-elles ont comparé les distributions avec deux standards : l’un établi pour une parité négative, l’autre positive comme on le voit sur la figure ci-dessous.
La courbe de gauche en bleu montre la probabilité que l’on mesurerait pour un point en particulier pour une particule de parité positive alors que celle de droite en rose donne cette probabilité pour une parité positive. La valeur mesurée par CMS, indiquée par la flèche verte, indique clairement que le nouveau boson a plus certainement une parité positive telle que prescrite par le modèle standard.
CMS a aussi commencé à chercher d’autres bosons au-delà de la limite de 600 GeV exclue jusqu’à maintenant. Si de nouveaux bosons apparaissent, cela pourrait signifier que celui qui a été trouvé n’est qu’un des cinq bosons prévus par la supersymmétrie, une autre théorie, et non pas l’unique boson de Higgs du modèle standard.
Alors, où en est-on? Avec plus du double de données utilisées en juillet, les scientifiques sont passé-e-s de la quête d’un boson élusif aux premières mesures de ses propriétés. Lorsqu’on aura établi sans équivoque tous les canaux de désintégration, leur taux, le spin et la parité de cette particule, on en saura plus sur son identité.
Pour l’instant, bien qu’il soit encore trop tôt pour se prononcer, ce boson semble avoir de plus en plus l’air et la chanson du boson de Higgs. On en saura encore un peu plus en mars prochain quand toutes les données auront été analysées et améliorées. Mais cela pourra prendre du temps avant qu’il ait dit son dernier mot.
Pauline Gagnon
Pour être averti-e lors de la parution de nouveaux blogs, suivez-moi sur Twitter: @GagnonPauline ou par e-mail en ajoutant votre nom à cette liste de distribution
Filed under: CERN,Ciencia,Higgs,Science |
| |No Comments
The mystery remains on the Higgs boson
Ever since the discovery of what might be the Higgs boson last July, physicists from the CMS and ATLAS experiments have been trying to pinpoint its true identity. Is this the Higgs boson expected by the Standard Model of particle physics or some “Higgs-like boson” befitting a different theoretical model?
To tell the difference, we must check all its properties, like how often this boson decays into different types of particles, and determine its spin and parity, two properties of fundamental particles.
Since the new boson has a short lifetime, it breaks apart immediately after being created. There are five ways a Standard Model Higgs boson should decay that we can study at the Large Hadron Collider (LHC): breaking into two photons, two W or two Z bosons, two b quarks or two tau leptons in well defined proportions. We must check both the presence of and the rate at which each decay mode occurs.
Last summer, just after the discovery of the new boson, both experiments reported unambiguous observations in only three channels. Unfortunately, the data sample was still too small to really be able to check if the new boson could decay into a pair of b quarks or tau leptons.
With more data available, the two experiments have just shown results for all channels today at a conference held in Kyoto as shown on the two figures below.
The left figure is for CMS and the right one for ATLAS. The values “?/?SM” and “?” are equivalent and represent the ratio of what is seen to what is expected from the Standard Model. So if ? is exactly one for a given channel, it means that channel decays at the rate expected from the theory. A value of zero would imply this particular decay channel is not seen at all, contrary to expectation. If ? has any other value, it implies the new boson does not behave quite as predicted. But one must take into account the error margin (the horizontal bar) before drawing any conclusion.
Both experiments now measured decays into two b quarks and two tau leptons and the errors have gone down for several channels. For now, CMS obtains a combined value of 0.88 ± 0.21whereas ATLAS mesures 1.3 ± 0.3. Both are compatible with 1.
The confirmed presence of all five modes would be compatible with a spin-zero particle. Having in addition all the correct decay rates would make the new boson look much more like a Higgs boson but it would still not be quite sufficient. The new boson must also have positive parity as the Standard Model predicts.
The spin of a fundamental particle refers to its rotation on itself, as the name suggests. Parity has to do with flipping direction in space, exactly like what happens when we watch an event directly or through a mirror where the left and right directions are inverted. Particles with a positive parity look the same when you observe them directly or through a mirror.
The parity can be determined by looking at the direction taken by all fragments after the boson decays. Depending on its parity, its debris will fly in a preferred direction. For example, CMS measured all angles between the four electrons or muons when the “Higgs-like” bosons decay into two Z bosons, each one ending in a pair of electrons or muons. Then they compared the distributions with two standards: one for positive, one for negative parity as shown on the figure below.
The left curve in blue shows the probability one would measure for a particular point on the horizontal axis if the new boson had a negative parity. The right curve in pink shows the same for a particle with positive parity. The value measured by CMS (green arrow) indicates the new boson most likely has a positive parity as expected by the Standard Model.
CMS also started looking for other bosons with masses beyond 600 GeV, the current excluded limit. If new bosons turn up, it could mean we have found one of the five Higgs bosons predicted by supersymmetry, a new theoretical model, and not the single Higgs boson predicted by the Standard Model.
So where do we stand? With more than twice as much data as shown in July, scientists have moved from searching for this elusive particle to starting to measure its properties. Once the decay channels, decay rates, spin and parity are clearly established, we will be able to determine its identity.
It is still too early to tell but the new boson looks like, sings like and dances more and more like a Higgs boson. More certainty will come out next March at a winter conference with still more data and improved analyses. But it will take a long time to figure out beyond any doubt if the discovered boson was really the Standard Model Higgs boson.
Pauline Gagnon
To be alerted of new postings, follow me on Twitter: @GagnonPauline or sign-up on this mailing list to receive and e-mail notification.
Filed under: CERN,Ciencia,Higgs,Science |
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Peter Higgs ofrece una conferencia en Barcelona
El Instituto de Física de Altas Energías (IFAE) y Obra Social "la Caixa" han invitado a Peter Higgs a explicar en primera persona la historia de la partícula que lleva su nombre, que puede ayudar a entender por qué la materia tiene masa. Será el martes 6 de noviembre en CosmoCaixa Barcelona a partir de las 18 horas y se puede seguir por Internet.
Read more »» Peter Higgs ofrece una conferencia en Barcelona
Filed under: Acelerador de particulas,Agujeros Negros,Antimateria,Antimatter,Astrofisica,Big Bang,Ciencia,Cosmologia,CPAN,CSIC,Cuántica,Dark energy,Dark matter,expansión acelerada,Fisica,Fisica de alta energia,Fisica de particulas,Fisica Nuclear,Fisica Teorica,Higgs,ILC,Inflaccion,LeHC,LEP,LHC,LHeC,Matematicas,Materia,Mecanica cuantica,Modelo Estandar,Neutrinos,Relatividad,Science,Sincrotrón,String Theory,SuperB,Supersimetria,SUSY,Tevatron,Universo |
| Agujeros negros, Antimateria, antimatter, Astrofisica, Boson de Higgs, CERN, Ciencia, Cosmologia, cpan, CSIC, Cuántica, Einstein, España, Fermilab, Fisica, Fisica de particulas, Fisica Nuclear, Fisica Teorica, LHC, Matematicas, Materia Oscura, Mecanica cuantica, Modelo estandar, Science, SUSY, Universo|No Comments
The space adventure comes to a conference at CERN Conferencias en Noviembre Live video courtesy of CERN 2012
The Alpha Magnetic Spectrometer experiment, assembled at CERN, currently operates as an external module of the ISS (Image: NASA)
The 4th International Conference on Particle and Fundamental Physics in Space (SpacePart12) will take place at CERN from 5 November to 7 November 2012. Space scientists and space policy makers from around the world have registered for this year's conference, which coincides with the centenary of the discovery of cosmic rays. Two of the biggest names in space exploration have been invited to give special talks open to the general public at CERN on 5 and 6 November.
At 8pm on 5 November, Edward Stone, professor at the California Institute of Technology and project scientist for the Voyager probes since 1972, will give a talk on the extraordinary story of these two probes, launched 35 years ago. His talk will be preceded by an introduction from Samuel Ting, principal investigator for the Alpha Magnetic Spectrometer experiment installed on the International Space Station (ISS).
At 8pm on 6 November William Gerstenmaier, associate administrator for Human Exploration and Operations for NASA and former manager of the ISS Program, will discuss the scientific work being conducted on the space station.
http://public.web.cern.ch/public/
The talks will be webcast here in English, with French interpretation provided.
Find out more
| CERN Colloquium | |
| Abstract | The question “What is the Universe made of?” is the longest outstanding problem in all of physics. Ordinary atoms only constitute 5% of the total, while the rest is of unknown composition. Already in 1933 Fritz Zwicky observed that the rapid motions of objects within clusters of galaxies were unexplained by the gravitation pull of luminous matter, and he postulated the existence of Dunkle Materie, or dark matter. A variety of dark matter candidates exist, including new fundamental particles already postulated in particle theories: axions and WIMPs (weakly interacting massive particles). Over the past 25 years, there has been a three pronged approach to WIMP detection: creating them at particle accelerators; searched for detection of astrophysical WIMPs scattering off of nuclei in underground detectors; and “indirect detection” of WIMP annihilation products (neutrinos, positrons, or photons). As yet the LHC has only placed bounds rather than finding discovery. For 13 years the DAMA experiment has proclaimed evidence of annual modulation of the signal which could be evidence of detection. Over the past few years the situation has become very exciting as many different experiments are independently seeing unexplained results; yet the various experiments do not seem to agree. The hunt for dark matter has become very exciting and yet very puzzling. This talk will describe the current anomalies that may herald WIMP discovery. |
| Submitted by | claire.gibon@cern.ch |
https://cdsweb.cern.ch/record/1489970
mas
SpacePart12 - 4th International...
by Battiston Roberto,...
Nov 05, 2012 08:00 AM
Europe/Zurich
Read more and more live webcast »» The space adventure comes to a conference at CERN Conferencias en Noviembre Live video courtesy of CERN 2012
Filed under: Acelerador de particulas,Alpha experiment,AMS,Antimateria,Antimatter,Atlas experiment,Big Bang,CERN,Ciencia,CMS experiment,Cosmologia,Cuántica,Dark energy,Dark matter,Fisica,Fisica de alta energia,Fisica de particulas,Fisica Nuclear,Fisica Teorica,Higgs,Inflaccion,LeHC,LEP,LHC,LHCB experiment,LHeC,Matematicas,Materia,Mecanica cuantica,Modelo Estandar,Nasa,Science |
| AMS-2, Astrofisica, Atlas, CERN, Ciencia, CMS, Cosmologia, Fisica, Fisica de particulas, Fisica Nuclear, Fisica Teorica, LHC, Materia Oscura, Mecanica cuantica, Nasa, Neutrinos, Science|No Comments
Higgs Fest symposium
Higgs Fest symposium part 1
On the 27 September Uppsala University organized a Higgs Fest Symposium in the State Hall of the Uppsala Castle with a program as outlined in the attached document with, as highlights, presentations by Fabiola Gianotti ( third speaker in the first of the three videos) and Noble prize Frank Wilczek (in the second video). We had some 700 persons, among those 4 school classes, attending the Symposium!
Produced by: Uppsala University
42:00 min. / 27 September 2012 / © 2012 CERN
http://cdsweb.cern.ch/record/1489653
Higgs fest symposium part 2
Produced by: Uppsala University
11:00 min. / 27 September 2012 / © 2012 CERN
http://cdsweb.cern.ch/record/1489652
Higgs Fest Symposium part 3
Produced by: Uppsala University
42:00 min. / 27 September 2012 / © 2012 CERN
http://cdsweb.cern.ch/record/1489651
Filed under: Acelerador de particulas,CERN,Higgs,LHC,Science |
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Are the Higgs Rumors True?
What Higgs rumors, you may ask? Well, there aren’t any that I know of, yet. But there might be soon…
There might be rumors soon because we are about to do another round of updates, for the 2012 Hadron Collider Physics Symposium (HCP). There aren’t any yet because our results (at least on CMS) are still “blinded,” which means that we haven’t actually looked at the “places” in the data where we see signs of our new boson. What we’re doing instead is looking at simulated data to see how much our results might improve when we add in the collisions we’ve recorded since ICHEP. We’re also putting in a few new analysis techniques, and checking them in the same way. And of course we are looking at data in other “places,” and we’re comparing it to simulations to make sure they’re doing a good job.
There will be several weeks between the moment we “unblind” — that is, look for the first time at what our signal looks like with the new data — and when results are shown at HCP. This is just as things were at ICHEP, and during those few weeks there were a lot of rumors around. It’s not possible to confirm or deny rumors when you know the status of ongoing work but haven’t yet agreed with your colleagues that it’s finished and ready to talk about publicly. So this time, I’m going to get in some general comments about rumors before I know anything at all about actual results. These comments will apply just as well to future updates.
What are we doing during the gap between unblinding and the conference? We’re checking our results, and putting them in a final presentable form. This is already compressed into a very short, hectic time, as I’ve written about before.
Are the rumors true? They are definitely not our official results, but they might turn out to be close. Or they might not. Specifically, the possibilities are:
- A rumor is pretty much right. It’s no secret that particle physicists are bad at keeping secrets, and we really don’t want to be good at it. If one in 3,000 physicists decides to tell the Internet what our first-pass internal results look like, we can’t really stop them. Of course they’re breaking the rules, and we wish they wouldn’t, because it’s a collaborative effort and we’d prefer to agree together that we’re finished before announcing our results — because we want to make sure we did everything as well as we can. But still, our first-pass results are usually pretty close to final.
- A rumor isn’t quite right. This could happen if we do find small mistakes or make refinements in the last few weeks of analyzing the data. This changes the answer by a bit, so the rumor is out of date. You could also make up a “not-quite-right” rumor just by making an educated guess based on our last results and how much new data we’ve taken!
- A rumor is just plain wrong. Nobody says rumors have to be based on anything. Or they could be based on a misunderstanding of far-from-complete internal results.
We physicists working on this stuff don’t find it easy to wait for the answers either, and as Jon Butterworth has pointed out, rumors of other experiments’ results are actually dangerous for our work! For everybody else who’s tempted to indulge in rumors, just remember: you might be getting part of the picture early, or you might not. The only way to be sure is to wait for the next real update.
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