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    Archived pages: 101 . Archive date: 2013-11.

  • Title: The T2K Experiment
    Descriptive info: .. English.. 日本語.. Home.. News.. About T2K.. About Neutrinos.. Gallery.. Contact Us.. For Physicists.. Members of the T2K collaboration.. The inside of Super-Kamiokande.. Aerial photograph of the J-PARC facility.. New results from T2K conclusively show muon neutrinos transform to electron neutrinos.. Today at the European Physical Society meeting in Stockholm, the international T2K collaboration announced a definitive observation of muon neutrino to electron neutrino transformation.. In 2011, the collaboration announced the first indication of this process, which was then a new type of neutrino oscillation; now, with 3.. 5 times more data, this transformation is firmly established.. Read more.. T2K receives a prize from a French science magazine.. T2K has been awarded a prestigious prize by La Recherche, a French science magazine.. This prize is called Le Prix La Recherche and has 12 categories including biology, chemistry, mathematics and medicine.. T2K received the physics prize for finding the first indications of oscillations from muon neutrinos to electron neutrinos.. Some T2K collaborators can be.. Read More.. T2K updates its electron-neutrino appearance result using its full dataset obtained by summer 2012.. The T2K collaboration presented new results on oscillations from muon neutrinos to electron neutrinos at the 2012 International Conference on High Energy Physics in Melbourne, Australia.. These oscillations are predicted by quantum physics if neutrinos have non-zero masses..  ...   of March 2011 was seen in Super-Kamiokande (T2K s far detector) on 26th Janaury 2012.. It is shown in the event display above, and has a Cherenkov ring produced by a muon in the centre of the image.. This muon was produced when a muon neutrino in.. The T2K Experiment.. T2K is a neutrino experiment designed to investigate how neutrinos change from one flavour to another as they travel (.. neutrino oscillations.. ).. An intense beam of muon neutrinos is generated at the.. J-PARC nuclear physics site.. on the East coast of Japan and directed across the country to the.. Super-Kamiokande.. neutrino detector in the mountains of western Japan.. The beam is measured once before it leaves the J-PARC site, using the near detector.. ND280.. , and again at Super-K: the change in the measured intensity and composition of the beam is used to provide information on the properties of neutrinos.. Science Goals of T2K.. the discovery of ν.. μ.. → ν.. e.. ( i.. e.. the confirmation that θ.. 13.. 0 ).. precision measurements of oscillation parameters in ν.. disappearance.. a search for sterile components in ν.. disappearance by observation of neutral-current events.. world-leading contributions to neutrino-nucleus cross-section measurements.. © The T2K Collaboration 2013.. All Rights Reserved.. Created by the Public Website Committee :.. t2kpwc@t2k-experiment.. org..

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  • Title: The T2K Experiment
    Descriptive info: Next Page.. July 19, 2013.. November 9, 2012.. October 23, 2012.. June 5, 2012.. February 3, 2012.. T2K publishes first off-axis measurement of muon-neutrino disappearance.. January 18, 2012.. T2K has published the first measurement of muon-neutrino disappearance by an off-axis experiment in Physical Review D at http://prd.. aps.. org/abstract/PRD/v85/i3/e031103.. The T2K beam is mostly composed of muon neutrinos, and 104 muon-neutrino events would have been expected in T2K s far detector Super Kamiokande if there were no neutrino oscillations.. However only 31 such events were observed,.. T2K makes the Top Ten !.. Physics World, the magazine of the Institute of Physics in the U.. K.. , has included one of T2K s results in its top ten scientific breakthroughs of 2011.. T2K was included for finding the first indications for oscillations from muon neutrinos to electron neutrinos as described here.. Six electron-neutrino events were seen in Super Kamiokande (T2K s  ...   and the first test run of proton beams since the earthquake was successfully conducted in the LINAC (linear.. Status of recovery work since the earthquake.. After several months of recovery work since the earthquake, we succeeded in taking the proton beam from Dec.. 24,2011 as scheduled and successfully confirmed the functionality of the beam line components and the reproducibility of neutrino production.. However, on Dec.. 22, during the final operation test, switching devices called IGBTs in the horn power supply were broken.. T2K statement on the OPERA anomaly (neutrinos travel faster than light).. October 20, 2011.. Based on our initial assessment of our capability, at the moment T2K cannot make any definitive statement to verify the OPERA measurement of the speed of the neutrino (the OPERA anomaly).. We will assess a possibility to improve our experimental sensitivity for a measurement to cross-check the OPERA anomaly in the future.. Such a measurement..

    Original link path: /category/news/
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  • Title: The T2K Experiment
    Descriptive info: T2K (Tokai to Kamioka) is a long-baseline neutrino experiment in Japan, and is studying neutrino oscillations.. Neutrinos are elementary particles which come in three flavours : electron, muon, and tau.. They only interact through the weak force, and are very difficult to detect as they rarely interact with matter.. Electron neutrinos are produced in large numbers in the Sun, and solar neutrinos can pass all the way through the Earth without interacting.. T2K has made a search for oscillations from muon neutrinos to electron neutrinos, and announced the first experimental indications for them in June 2011.. These oscillations had never been observed by any previous experiment.. T2K is also making measurements of oscillations from muon neutrinos to tau neutrinos (which have been seen by previous experiments).. It will make the most accurate measurements to date of the probability of these oscillations and of the difference between the masses of two of the neutrinos (to be precise, T2K measures the difference between the squares of these masses).. The T2K Neutrino Beam.. Passage of the muon neutrino beam from J-PARC to Super K.. The T2K experiment sends an intense beam of muon neutrinos from Tokai, which is on the east coast of Japan, to Kamioka at a distance of 295 km in western Japan.. The neutrino beam is made in collisions between a proton beam and a graphite target; these collisions produce pions, which quickly decay to muons and muon neutrinos.. The muons and any remaining protons and pions are stopped by a second layer of graphite, but the neutrinos pass through this layer.. The energy of the neutrinos in the beam is important as oscillations depend on it: low-energy neutrinos oscillate in a shorter distance than high-energy neutrinos.. The T2K neutrino beam has a range of energies centred on 600 MeV since muon neutrinos with this energy are most likely to oscillate after travelling 295 km.. The T2K Detectors.. Components of the ND280 near detector.. It is essential that the direction of the neutrino beam be stable to within 1/20 th of a degree, and that the intensity of the beam be constant over time.. Checks of the direction and intensity of the beam are made on a daily basis using neutrino interactions with iron in the Interactive Neutrino GRID (INGRID) near detector.. This is situated 280 metres from the target in the centre of the neutrino beam.. T2K studies neutrino oscillations with two separate detectors, both of which are 2.. 5 degrees away from the centre of the neutrino beam.. The ND280 near detector is also 280 metres from the target, and measures the number of muon neutrinos in the beam before any oscillations occur.. T2K neutrinos have much higher energies than solar neutrinos, and high-energy neutrinos are more likely to interact.. A small number of muon neutrinos interact with scintillator or water in the ND280, and many of these interactions produce a muon.. The muon is a charged particle, and can be detected since it ionises gas which is placed immediately after the interaction points.. These  ...   a map of the phototubes inside the Super-K detector, from an event recorded a short time ago.. The display will update every few seconds.. These are just a random sample of the events recorded every second at Super-K.. (For an explanation of the event display,.. Most of the events you see will be downward-going muon tracks, NOT T2K beam neutrinos! In fact most of the neutrino interactions we sift out of the millions of events recorded at Super-K are caused by neutrinos from the Sun or the Earth s atmosphere.. Only a few hundred neutrino interactions per year are due to beam neutrinos traveling from J-PARC.. The oscillations from muon neutrinos to electron neutrinos were seen in Super K as the diffuse rings from electrons produced in interactions of electron neutrinos with the water.. 28 electron-neutrino events have been seen in Super K, whereas only 4.. 6 would have been expected if there were no oscillations.. The probability that these 28 events were due to a process other than oscillations from muon neutrinos to electron neutrinos is tiny at 10.. -13.. , and confirms that these oscillations are occurring.. T2K is also studying oscillations from muon neutrinos to tau neutrinos, and these are seen as a reduction in the number of muon neutrinos detected in Super K compared with the ND280 prediction for no oscillations.. Advantages of an Off-Axis Experiment.. T2K is the world s first off-axis neutrino experiment, with ND280 and Super K positioned 2.. The off-axis part of the beam has a narrower range of energies than the on-axis part, which means that a larger fraction of neutrinos change flavor by the time they reach Super K.. Also the most important measurement is that of neutrino energy and this measurement is made most accurately from events in which a neutrino interacts with a neutron in the detector to produce a muon and a proton.. The off-axis part of the beam has a larger fraction of these events than the on-axis part, which enables T2K to make more accurate measurements of neutrino energy.. This leads to more accurate measurements of the probability of neutrino oscillations and neutrino mass differences than those from previous experiments.. The T2K Schedule.. T2K began its experimental commissioning in April 2009 and to take physics data in January 2010.. It suspended its operation after the major earthquake of March 2011 in order to check and repair its equipment.. These repairs were completed by March 2012, and T2K began once more to take data from that time.. It will continue to take data using a muon-neutrino beam for several years.. In a subsequent phase, T2K will also take data using a muon-antineutrino beam.. It is believed that equal quantities of matter and antimatter were produced in the Big Bang and it is not understood why the present-day Universe is composed entirely of matter.. The aim of using an antineutrino beam will be to seek a solution to this by comparing antineutrino oscillations with neutrino oscillations.. The Collaboration.. Physics Goals.. Institutes Involved.. Financial Support..

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  • Title: The T2K Experiment
    Descriptive info: This page is intended to help you learn more about neutrinos and their fascinating physics.. You can do this in three ways, depending on what you know already and what you want to know.. If you don t know very much about neutrinos at all, try our.. Neutrino FAQ.. If you feel you already know a bit about neutrinos, but would like to learn more, look at the links in the menu on this page, which together provide a detailed introduction to neutrinos and neutrino physics.. This should be suitable for physics students, physics teachers, and those who ve  ...   try.. Neutrino Unbound.. or.. The Neutrino Oscillation Industry.. (These are external links, not maintained by T2K.. ).. You may also be interested in the following external links:.. the Neutrino Blog.. , by T2K collaboration member Dr Ben Still;.. BBC Radio 4 In Our Time.. programme on The Neutrino , featuring T2K collaboration members Prof.. Dave Wark and Dr Susan Cartwright.. Happy exploring, and we hope you find what you re looking for!.. What Is A Neutrino?.. A Brief History Of Neutrinos.. Neutrino Sources.. Neutrino Detection.. Neutrinos in the Standard Model.. Beyond the Standard Model.. What We Know.. Open Questions.. References..

    Original link path: /neutrinos/
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  • Title: The T2K Experiment
    Descriptive info: We are happy for you to use any of these photographs yourself, but please credit the T2K Experiment and include a link to.. http://t2k-experiment.. unless we ve provided an alternative credit in the description below the image.. Thanks!.. J-PARC and Beamline.. INGRID.. Miscellaneous..

    Original link path: /gallery/
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  • Title: The T2K Experiment
    Descriptive info: Website.. For questions about this site or its contents contact the T2K Public Website Committee:.. Collaboration Representatives.. Takashi Kobayashi,.. Spokesperson,.. takashi.. kobayashi@kek.. jp.. Chang Kee Jung,.. International Co-Spokesperson,.. alpinist@nngroup.. physics.. sunysb.. edu.. National Representatives.. Representatives from each country are listed on the.. National Contacts.. page.. Takashi Kobayashi.. Chang Kee Jung..

    Original link path: /contact-us/
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  • Title: The T2K Experiment
    Descriptive info: Observation of ν.. Appearance (Summer 2013).. The ν.. appearance analysis was performed on our entire data-set up to April 12th, 2013 (A beam exposure of 6.. 39×10.. 20.. p.. o.. t.. We observed 28 single-ring electron-like events at Super-Kamiokande while 4.. 64±0.. 53 events would be expected if sin.. 2.. (2θ.. ) = 0.. The probability of background fluctuation resulting in 28 or more events being observed is 9.. 9×10.. -14.. , which, when converted to a significance level, is 7.. 5σ.. The fitted value of sin.. ) is 0.. 150.. +0.. 039..  ...   , θ.. 23.. = π/4 and normal (inverted) hierarchy.. This is the first ever observation of an explicit ν.. appearance channel.. Our results for the normal (left) and inverted (right) hierarchies.. The areas between colored lines show allowed regions of sin.. ) for each value of δ.. at 68% (green) and 90% (blue) confidence level.. The black solid line is the best fit value of sin.. ) for each assumed value of δ.. and the mass hierarchy.. Publications.. Results.. From our wiki:.. Theses.. Conference Talks.. Conference Posters.. Proceedings.. Letter of Intent (PDF).. Jobs..

    Original link path: /for-physicists/
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  • Title: The T2K Experiment
    Descriptive info: Electron-neutrino candidate in Super Kamiokande.. 5 times more data, this transformation is firmly established.. The probability that random statistical fluctuations alone would produce the observed excess of electron neutrinos is less than one in a trillion.. Equivalently, the new results exclude such a possibility at the 7.. 5 sigma level of significance.. This T2K observation is the first of its kind in that an explicit appearance of a unique flavor of neutrino at a detection point is unequivocally observed from a different flavor of neutrino at its production point.. In the T2K experiment in Japan, a muon-neutrino beam is produced at the Japan Proton Accelerator Research Complex (J-PARC), located in Tokai village, Ibaraki prefecture, on the east coast of Japan.. The neutrino beam is monitored by a detector complex in Tokai and aimed at the gigantic Super-Kamiokande underground detector in Kamioka, near the west coast of Japan, 295 km (185 miles) away from Tokai.. An analysis of the data from the Super-Kamiokande detector associated with the neutrino beam time from J-PARC reveals that there are more electron neutrinos (a total of 28 events) than would be expected (4.. 6 events) without this new process.. Neutrino oscillation is a manifestation of a long-range quantum mechanical interference.. Observation of this new type of neutrino oscillation leads the way to new studies of charge-parity (CP) violation which provides a distinction between physical processes involving matter and antimatter.. This phenomenon has only been observed in quarks (for which Nobel prizes were awarded in 1980 and 2008).. CP violation in neutrinos in the very early universe may be the reason that the observable universe today is dominated by matter and no significant antimatter, which is one of the most profound mysteries in science.. Now with T2K firmly establishing this form of neutrino oscillation that is sensitive to CP violation, a search for CP violation in neutrinos becomes a major scientific quest in the coming years, and T2K will continue to play a  ...   the management to deliver high-quality beam to T2K after the devastating March 2011 earthquake in eastern Japan which caused severe damage to the accelerator complex at J-PARC, and abruptly discontinued the data-taking run of the T2K experiment.. More detailed information on this announcement including some images can be found at.. org/supporting-material-for-t2k-press-release-19-7-2013.. This announcement is also available in Japanese at.. http://www.. kek.. jp/ja/NewsRoom/Release/20130719210000/.. Media Contacts for Further Inquiries:.. Globally and in Japan:.. Prof.. Takashi Kobayashi, Spokesperson, T2K Collaboration, The Institute of Particle and Nuclear Studies, KEK (Tsukuba, Japan), takashi.. Phone: +81 90-9840-2413 (c), +81 29-864-5414 (o), +81 29-852-4881 (h).. Globally and in U.. :.. Chang Kee Jung, International Co-Spokesperson, T2K Collaboration, State University of New York at Stony Brook (Stony Brook, NY, USA) and Kavli IPMU, University of Tokyo (Kashiwa, Japan), chang.. jung@stonybrook.. Phone: +1 631-707-2018 (c), +1 631-632-8108/8095 (o), +1 631-474-4563 (h).. In Canada:.. Hiro Tanaka, University of British Columbia (Vancouver, Canada), tanaka@phas.. ubc.. ca.. Phone: +1 778-772-3690.. In France:.. Dr.. Jacques Dumarchez, LPNHE-Paris (IN2P3) (Paris, France), jacques.. dumarchez@cern.. ch.. Phone: +33 1 44 27 48 42.. Marco Zito, CEA/IRFU (Saclay, France), marco.. zito@cea.. fr.. Phone: +33 6 84 61 09 51.. In Germany:.. Achim Stahl, RWTH Aachen University (Aachen, Germany), stahl@physik.. rwth-aachen.. de.. Phone: +49 241 80 27301 (o), +49 172 5761500 (c).. In Italy:.. Maria Gabriella Catanesi, INFN Sezione di Bari (Bari, Italy), gabriella.. catanesi@cern.. Phone: +41 764871532.. In Poland:.. Ewa Rondio, NCBJ, Warsaw (Warsaw, Poland), Ewa.. Rondio@fuw.. pl.. Phone: +48 691 150 052.. In Russia:.. Yuri Kudenko, INR (Moscow, Russia), kudenko@inr.. ru.. Phone: +7-903-6159125 (c), +7-495-8510184 (o).. In Spain:.. Federico Sanchez, IFAE, Barcelona (Barcelona, Spain), fsanchez@ifae.. es.. Phone: +34 93 5812835.. Anselmo Cervera, IFIC, Valencia (Valencia, Spain), anselmo.. cervera@cern.. In Switzerland:.. Andre Rubbia, ETHZ (Zurich, Switzerland), andre.. rubbia@cern.. Phone: +41 44 633 3873.. In Suisse Romande:.. Alain Blondel, Université de Genève, alain.. blondel@unige.. Phone: +41 76 487 4058.. In U.. Dave Wark, STFC/RAL/Daresbury Laboratory/Oxford University (Oxford, U.. ), david.. wark@stfc.. ac.. uk.. Phone: +44 7788186085..

    Original link path: /2013/07/new-results-from-t2k-conclusively-show-muon-neutrinos-transform-to-electron-neutrinos/
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  • Title: The T2K Experiment
    Descriptive info: T2K collaborators receiving Le Prix La Recherche.. T2K has been awarded a prestigious prize by.. La Recherche.. , a French science magazine.. T2K received the physics prize for finding.. the first indications of oscillations from muon neutrinos to electron neutrinos.. Some T2K collaborators can be seen in the photo receiving the award at the Musée du Quai Branly in Paris on 23rd October 2012.. The certificate for the prize is shown below.. Le Prix La Recherche certificate..

    Original link path: /2012/11/t2k-receives-a-prize-from-a-french-science-magazine/
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  • Title: The T2K Experiment
    Descriptive info: The new results were obtained with more than twice as much data as the.. T2K paper published in Physical Review Letters in 2011.. , which announced the first experimental indications for these oscillations.. In Melbourne T2K reported that 11 electron-neutrino events were seen in its far detector.. , whereas only 3.. 2 would be expected if there were no oscillations.. The probability of these 11 events being due to statistical fluctuations in processes other than oscillations from muon to electron neutrinos is small at 0.. 08%.. Three  ...   oscillation parameter sin.. ) was measured to be 0.. 094.. 053.. assuming standard values of related quantities.. This parameter represents approximately the fraction of muon neutrinos that oscillate to electron neutrinos when the muon neutrinos have energies of 6 x 10.. 8.. electron-volts in T2K (one electron-volt is the energy acquired by an electron when it is accelerated in an electric field of one volt).. More details of this result are available on the.. For Physicists page.. , and the presentation given at the Melbourne conference is.. here..

    Original link path: /2012/10/t2k-updates-its-electron-neutrino-appearance-result-using-its-full-dataset-obtained-by-summer-2012/
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  • Title: The T2K Experiment
    Descriptive info: At the 2012 Neutrino conference in Kyoto, Japan, the T2K collaboration.. presented new results on electron neutrino appearance from muon neutrino.. that confirmed their previous published results in PRL, in July 2011,.. which reported the first single experimental indication that θ.. is non-zero and large with a 2.. Based on the data collected until May 15, 2012, corresponding to 2.. 56×10.. POT, 10 “electron neutrino appearance” candidate events were observed in the.. T2K far detector, Super-Kamiokande.. This observation further solidifies the.. previous result.. We now find that the probability of background fluctuation.. to yield 10 or more events (p-value) is 0.. 08% corresponding to a 3.. 2 σ level.. of significance, making it extremely unlikely that a statistical fluctuation.. is at the origin of the  ...   on θ.. from nuclear power reactor experiments.. are in agreement with this T2K result.. While the reactor experiments are.. based on the disappearance of electron anti-neutrinos,.. the T2K result shows the appearance of electron neutrinos.. in a muon neutrino beam, which is also sensitive to the potential.. CP-violation effects of Nature.. The consistency of these two very different measurements of θ.. gives us.. confidence in our understanding of the underlying physics, and provides us.. with a unique opportunity to resolve the unknown neutrino mass hierarchy.. It also opens the door to the search for CP violation (which would result in.. oscillations being different for neutrinos and anti-neutrinos), which might.. be a hint to the physics behind the excess of matter over anti-matter in the.. universe..

    Original link path: /2012/06/t2k-presents-new-results-that-confirms-their-electron-neutrino-appearance-results-published-in-july-2011/
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  • Archived pages: 101