[LHC] COLLAUDO IL 9 AGOSTO

[Pess]

A quanto pare le cose vanno bene al CERN... Il 6 dicembre ci sarà la pausa invernale...
Cmq ora su RAI 2 stanno facendo un dossier di approfondimento proprio sull' LHC e sugli sviluppi attuali di vari esperimenti in ballo...

[DarKilleR]

Originariamente inviato da Pess

A quanto pare le cose vanno bene al CERN... Il 6 dicembre ci sarà la pausa invernale...
Cmq ora su RAI 2 stanno facendo un dossier di approfondimento proprio sull' LHC e sugli sviluppi attuali di vari esperimenti in ballo...

l'ho visto in replica TG2 Dossier da rai TV perchè la mi mamma m'ha detto: "Weee c'è il tuo prof di Fisica in TV"

Ho avuto Guido Tonelli al suo ultimo anno di insegnamento ad Ingegneria Civile a Pisa prima di dedicarsi 24/24h e 7/7gg all'esperimenti che avvengono all'LHC!

[Pess]

Come proseguono le cose all' LHC?

[D.O.S.]

tutti qua a discutere di fusione fredda e vi siete persi questa notiziona :

http://miaplacidusedaltriracconti.bl...coperta-e.html

non è una conferma ma qualcosa dev'esserci .

[Pess]

Che novità ci sono da queste parti?

[quelarion]

Apparentemente il fatto che non ci siano novitá é di per sé una novitá. Sentendo gente in CMS ci si aspettava di vedere qualcosa giá a 7 TeV, e invece per ora niente...

[gibi87]

Io seguo gli sviluppi tramite questo blog dell'infn --> http://www.infn.it/lhcitalia/

[s3s3]

Qualcuno si di questa cosa o è solo una voce?

http://gaianews.it/attualita/cern-sc...higgs/id=15355

Ciao.

Stefano.

[robertogl]

Originariamente inviato da s3s3

Qualcuno si di questa cosa o è solo una voce?

http://gaianews.it/attualita/cern-sc...higgs/id=15355

Ciao.

Stefano.

io avevo letto proprio il contrario
http://www.borborigmi.org/2011/12/01...ento-comunque/

l'immagine che c'è sul blog è presa dal pdf che si trova qui
https://cdsweb.cern.ch/record/874049
non si nega ne si conferma, però non dice nulla che possa far pensare ad una scoperta imminente

edit: http://press.web.cern.ch/press/

[MarKo90]

NEWS riguardanti l'Higgs dal seminario di oggi tenuto al CERN:

Originariamente inviato da Cern.ch

ATLAS and CMS experiments present Higgs search status

13 December 2011. In a seminar held at CERN1 today, the ATLAS2 and CMS3 experiments presented the status of their searches for the Standard Model Higgs boson. Their results are based on the analysis of considerably more data than those presented at the summer conferences, sufficient to make significant progress in the search for the Higgs boson, but not enough to make any conclusive statement on the existence or non-existence of the elusive Higgs. The main conclusion is that the Standard Model Higgs boson, if it exists, is most likely to have a mass constrained to the range 116-130 GeV by the ATLAS experiment, and 115-127 GeV by CMS. Tantalising hints have been seen by both experiments in this mass region, but these are not yet strong enough to claim a discovery.

Higgs bosons, if they exist, are very short lived and can decay in many different ways. Discovery relies on observing the particles they decay into rather than the Higgs itself. Both ATLAS and CMS have analysed several decay channels, and the experiments see small excesses in the low mass region that has not yet been excluded.

Taken individually, none of these excesses is any more statistically significant than rolling a die and coming up with two sixes in a row. What is interesting is that there are multiple independent measurements pointing to the region of 124 to 126 GeV. It's far too early to say whether ATLAS and CMS have discovered the Higgs boson, but these updated results are generating a lot of interest in the particle physics community.

"We have restricted the most likely mass region for the Higgs boson to 116-130 GeV, and over the last few weeks we have started to see an intriguing excess of events in the mass range around 125 GeV," explained ATLAS experiment spokesperson Fabiola Gianotti."This excess may be due to a fluctuation, but it could also be something more interesting. We cannot conclude anything at this stage. We need more study and more data. Given the outstanding performance of the LHC this year, we will not need to wait long for enough data and can look forward to resolving this puzzle in 2012."

"We cannot exclude the presence of the Standard Model Higgs between 115 and 127 GeV because of a modest excess of events in this mass region that appears, quite consistently, in five independent channels," explained CMS experiment Spokesperson, Guido Tonelli. "The excess is most compatible with a Standard Model Higgs in the vicinity of 124 GeV and below but the statistical significance is not large enough to say anything conclusive. As of today what we see is consistent either with a background fluctuation or with the presence of the boson. Refined analyses and additional data delivered in 2012 by this magnificent machine will definitely give an answer."

Over the coming months, both experiments will be further refining their analyses in time for the winter particle physics conferences in March. However, a definitive statement on the existence or non-existence of the Higgs will require more data, and is not likely until later in 2012.

The Standard Model is the theory that physicists use to describe the behaviour of fundamental particles and the forces that act between them. It describes the ordinary matter from which we, and everything visible in the Universe, are made extremely well. Nevertheless, the Standard Model does not describe the 96% of the Universe that is invisible. One of the main goals of the LHC research programme is to go beyond the Standard Model, and the Higgs boson could be the key.

A Standard Model Higgs boson would confirm a theory first put forward in the 1960s, but there are other possible forms the Higgs boson could take, linked to theories that go beyond the Standard Model. A Standard Model Higgs could still point the way to new physics, through subtleties in its behaviour that would only emerge after studying a large number of Higgs particle decays. A non-Standard Model Higgs, currently beyond the reach of the LHC experiments with data so far recorded, would immediately open the door to new physics, whereas the absence of a Standard Model Higgs would point strongly to new physics at the LHC's full design energy, set to be achieved after 2014. Whether ATLAS and CMS show over the coming months that the Standard Model Higgs boson exists or not, the LHC programme is opening the way to new physics.

http://press.web.cern.ch/press/Press.../PR25.11E.html

Originariamente inviato da Scientific American

Tantalizing Hints of Elusive Higgs Particle Announced
The long-sought Higgs boson is tied into the leading theory of how quarks, electrons and other particles get their mass

December 13, 2011
Two international teams of physicists have found subtle hints of what could be the Higgs boson, a particle whose existence would help explain why other particles have mass. The researchers today announced that they may have uncovered a whiff of the Higgs in data collected at the Large Hadron Collider (LHC), the massive particle accelerator outside Geneva that accelerates protons to nearly light speed before smashing them together so physicists can sift through the wreckage for new particles and phenomena.

At a December 13 seminar at CERN, the European laboratory that hosts the LHC, spokespersons for the two collaborations announced that their respective detectors, ATLAS and CMS, had each seen data consistent with the presence of the Higgs particle. The particle is associated with the Higgs field, named for British physicist Peter Higgs, who in the 1960s put forth the idea that particles get their mass by interacting with a hypothetical field that permeates space.

But actually identifying the particle to validate the existence of the Higgs field has been a decades-long challenge that outlived previous generations of particle colliders; the LHC was built to solve the Higgs puzzle once and for all. As had been rumored, the physicists have now seen hints of the Higgs boson but not enough data to claim a definitive discovery. Each team sees modest spikes in its data that could be caused by a Higgs with a mass of about 125 giga-electron volts, or GeV. (An electron-volt is a unit of mass favored by particle physicists; a proton is roughly one GeV.) ATLAS has a signal of 2.3 sigma, or standard deviations, a measure of statistical confidence; CMS's signal is 1.9 sigma. (Statistically speaking, a 2-sigma result has about a 5 percent chance of being a fluke, assuming that the physicists have properly accounted for the nuances of the experiment.) A claim of discovery requires 5-sigma evidence, or a less than one-in–one million chance of a fluke. The LHC physicists say that evidence may be in hand by the end of the LHC's 2012 run.

Contributing editor Davide Castelvecchi is at CERN for today's announcement. We will update this page later in the day with his report from Geneva.

http://www.scientificamerican.com/ar...ggs-hints-cern

[as5365]

Per chi passa da Perugia nelle prossime settimane...
http://www.pg.infn.it/estremo/

[Pess]

E' molto che non sento parlare il giro dell'LHC. Ci sono novità di rilievo o al momento è tutto calmo?

[dilu92]

Originariamente inviato da Pess

E' molto che non sento parlare il giro dell'LHC. Ci sono novità di rilievo o al momento è tutto calmo?

ma non lo avevano spento per riiniziare a 7 o a 14 tev?

[robertogl]

ripartirà a 8 tev a marzo

[Octane]

LHC dovrebbe ripartire a marzo prossimo dopo la pausa di quasi due anni

http://home.web.cern.ch/about/update...-drawing-close

Dovrebbero inoltre innalzare l'energia delle collisioni da 8TeV a 14TeV

[BonOVoxX81]

Mi sapete dire dove trovare un bel documentario in italiano sulla costruzione dell'LHC ?

[Octane]

Sulla pagina di wikipedia c'e' la storia dell'acceleratore

http://it.wikipedia.org/wiki/Large_Hadron_Collider

oppure un articolo più "generale":

http://www.repubblica.it/scienze/201...ern-101028316/

[BonOVoxX81]

Originariamente inviato da Octane

Sulla pagina di wikipedia c'e' la storia dell'acceleratore

http://it.wikipedia.org/wiki/Large_Hadron_Collider

oppure un articolo più "generale":

http://www.repubblica.it/scienze/201...ern-101028316/

Già letto,ti ringrazio

Sto proprio cercando un documentario fatto bene....ma alberto angela cosa aspetta a farci una puntata intera sull'LHC ?

[+Benito+]

Alberto è notoriamente focalizzato su temi differenti da quelli di suo papà