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Theoretical physicists win massive awards

Por: System Administrator En: Mar 31 de Jul, 2012 16:25 -05 (1514 Lecturas)

Internet entrepreneur Yuri Milner's Fundamental Physics Prize Foundation has selected nine researchers to receive US$3 million each. Here is the foundation's list of the winners: Nima Arkani-Hamed?, Alan Guth, Alexei Kitaev, Maxim Konstevich, Andrei Linde, Juan Maldacena (Argentina), Nathan Seiberg, Ashoke Sen, and Edward Witten.

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Observation of a New Particle in the Search for the Standard Model Higgs Boson with the ATLAS Detector at the LHC

Por: System Administrator En: Mar 31 de Jul, 2012 13:45 -05 (2394 Lecturas)

The official paper from ATLAS colaboration with the discovery of the Higgs at 5.9$\sigma$:
arXiv:1207.7214

Since, the global gloabal significance of the result until 600 GeV is 5.1$\sigma$, this is technically the discovery of a new particle.

Update: CMS paper arXiv:1207.7235

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HIggs FAQ

Por: System Administrator En: Mié 04 de Jul, 2012 16:57 -05 (1556 Lecturas)

> ¿Qué implicaciones tiene para nuestro conocimiento del universo?
Este descubrimiento confirma que el Universo se encuentra en un estado especial llamado 'Estado de ruptura espontánea de la simetría electródebil', que hace que el Universo como tal pueda ser considerado como un superconductor electrodébil, en el que aparentemente todas las partículas fundamentales, excepto el fotón y los gluones, tienen masa. Cuando el Universo se encontraba en un estado simétrico una billonésima de segundo antes del Big-Bang?, todas las partículas, incluyendo al Higgs, carecían de masa. El LHC es una ventana a ese estado más simétrico. Dentro de un superconductor usual de tipo electromagnético el fotón adquiere una masa aparente como consecuencia de su interacción con una configuración especial de electrones en pares de espines opuestos que se comporta como una partícula escalar conocida como par de Cooper. Si alguien pudiese vivir dentro de un superconductor electromagnético no podría saber si la masa del fotón es real o ficticia. El LHC es la forma de poder escapar momentáneamente del estado de superconductivadad electrodébil y poder comprobar si la masa del Z y W, los "fotones" de la interacción débil, es debida a su interacción con el Higgs. La diferencia con el par de Cooper es que el Higgs es elemental: no tiene estructura interna. La posibilidad de que el Higgs fuese por ejemplo un par top-top de espines opuestos queda descartada automáticamente al ser su masa diferente de 350 GeV (2 veces la masa del top)

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Sending the word "neutrino" with neutrinos

Por: System Administrator En: Jue 15 de Mar, 2012 22:24 -05 (1280 Lecturas)

From The Economist

: The message, which read "neutrino", was transcribed into a string of "0s" and "1s" using the standard code employed in digital communications. The beam was then tweaked so that a pulse created using a full bunch of protons corresponded to a "1", while one with no protons signalled a "0". The pulses were separated by 2.2 seconds and the message was repeated in cycle for about two hours.

At the receiving end, each "1" translated into an average of 0.8 neutrino events registered in the detector; a "0", naturally, translated into none. This was enough to reconstruct the message accurately.

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$\theta_{13}\ne 0$ with 5.2 $\sigma$ confidence level

Por: System Administrator En: Jue 08 de Mar, 2012 14:21 -05 (1255 Lecturas)

Daya Bay experiment just announced the measurement of one of the last parameter of the oscillation interpretation of neutrino experiments: $\theta_{13}$. See for example the discussion in Résonaances

$U_{13}^2=0.023\pm0.004$

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Higgs: evidence growing stronger.

Por: System Administrator En: Mié 07 de Mar, 2012 08:16 -05 (1472 Lecturas)

The news of the day is the update on Higgs searches released by the LHC and Tevatron at the Moriond conference. See discussion at Résonaances

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Faster than light neutrinos?

Por: System Administrator En: Vie 23 de Sep, 2011 18:00 -05 (1402 Lecturas)

The things you need to know about this result are:

It’s enormously interesting if it’s right.
It’s probably not right

Discussion in two of the high energy physics blogs around:

http://goo.gl/W37zr

http://goo.gl/dc3zj

Citations of arXiv:1109.4897

: http://goo.gl/nZG2Q

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If no Higgs then what?

Por: System Administrator En: Jue 01 de Sep, 2011 21:40 -05 (1403 Lecturas)

There some consensus that the worst scenario at LHC is the discovery of a Higgs around 120 GeV but not signals of new physics at all. The nightmare scenario where no Higgs nor resonance is found at LHC was not considered before... until now: arXiv:1108.1183

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¿Qué es el bosón de Higgs?

Por: System Administrator En: Sáb 16 de Jul, 2011 00:18 -05 (1731 Lecturas)

Reproductor Flash no disponible.

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Conferencia precongreso

Por: System Administrator En: Sáb 11 de Jun, 2011 17:06 -05 (1089 Lecturas)

"The World Science Festival

" es un gran evento de divulgación que se viene realizando desde el 2008. Con motivo del Congreso Nacional de Divulgación Científica, restransmitiremos los foros de física de partículas de la edición de 2010, comenzando la próxima semana con: Back to the Big Bang: Inside the Large Hadron Collider

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