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Now showing items 1 - 16 of 23

  • Search for free decay of negative pions in water and light materials

    Numao, T.   Davydov, Yu. I.   Poutissou, J-M.   Awes, T. C.   Cianciolo, V.   Berridge, S.   Bugg, W.   Efremenko, Yu.   Gearhart, R.   Ovchinnikov, S.  

    We report on a search for the free-decay component of pi - stopped in water and light materials. A nonzero value of this would be an indication of anomalous nu e contamination to the nu e and nu mu production at stopped-pion neutrino facilities. No free-decay component of pi - was observed in water, Beryllium, and Aluminum, for which upper limits were established at 8.2times10 -4, 3.2times10 -3, and 7.7times10 -3, respectively
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  • The role of cytokines for recruitment of eosinophils in bronchial asthma

    Numao, T.   Fukuda, T.   Fukushima, Y.   Makino, S.  

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  • 65Ga decay and the level scheme of 65Zn

    Numao, T.   Takigishi, S.   Chiba, R.  

    The decay of 15 minutes 65Ga to the level of 65 Zn has been studied with the 35 cc Ge(Li) detector. The gamma-rays of about forty energies have been observed. A decay scheme is proposed
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  • lifetime measurement

    Numao, T.   Macdonald, J. A.   Marshall, G. M.   Olin, A.   Fujiwara, M. C.  

    \0
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  • Search for production of an invisible dark photon in (0) decays

    Gil, E. Cortina   Kleimenova, A.   Minucci, E.   Padolski, S.   Petrov, P.   Shaikhiev, A.   Volpe, R.   Georgiev, G.   Kozhuharov, V.   Litov, L.   Numao, T.   Petrov, Y.   Velghe, B.   Bryman, D.   Fu, J.   Husek, T.   Jerhot, J.   Kampf, K.   Zamkovsky, M.   Aliberti, R.   Khoriauli, G.   Kunze, J.   Lomidze, D.   Peruzzo, L.   Vormstein, M.   Wanke, R.   Dalpiaz, P.   Fiorini, M.   Neri, I.   Norton, A.   Petrucci, F.   Wahl, H.   Ramusino, A. Cotta   Gianoli, A.   Iacopini, E.   Latino, G.   Lenti, M.   Parenti, A.   Bizzeti, A.   Bucci, F.   Antonelli, A.   Lanfranchi, G.   Mannocchi, G.   Martellotti, S.   Moulson, M.   Spadaro, T.   Ambrosino, F.   Capussela, T.   Corvino, M.   Di Filippo, D.   Massarotti, P.   Mirra, M.   Napolitano, M.   Saracino, G.   Anzivino, G.   Brizioli, F.   Imbergamo, E.   Lollini, R.   Piandani, R.   Santoni, C.   Barbanera, M.   Cenci, P.   Checcucci, B.   Lubrano, P.   Lupi, M.   Pepe, M.   Piccini, M.   Costantini, F.   Di Lella, L.   Doble, N.   Giorgi, M.   Giudici, S.   Lamanna, G.   Lari, E.   Pedreschi, E.   Sozzi, M.   Cerri, C.   Fantechi, R.   Pontisso, L.   Spinella, F.   Mannelli, I.   D'Agostini, G.   Raggi, M.   Biagioni, A.   Leonardi, E.   Lonardo, A.   Valente, P.   Vicini, P.   Ammendola, R.   Bonaiuto, V.   Fucci, A.   Salamon, A.   Sargeni, F.   Arcidiacono, R.   Bloch-Devaux, B.   Boretto, M.   Menichetti, E.   Migliore, E.   Soldi, D.   Biino, C.   Filippi, A.   Marchetto, F.   Engelfried, J.   Estrada-Tristan, N.   Bragadireanu, A. M.   Ghinescu, S. A.   Hutanu, O. E.   Enik, T.   Falaleev, V.   Kekelidze, V.   Korotkova, A.   Madigozhin, D.   Misheva, M.   Molokanova, N.   Movchan, S.   Polenkevich, I.   Potrebenikov, Yu.   Shkarovskiy, S.   Zinchenko, A.   Fedotov, S.   Gushchin, E.   Khotyantsev, A.   Kudenko, Y.   Kurochka, V.   Medvedeva, M.   Mefodev, A.   Kholodenko, S.   Kurshetsov, V.   Obraztsov, V.   Ostankov, A.   Semenov, V.   Sugonyaev, V.   Yushchenko, O.   Bician, L.   Blazek, T.   Cerny, V.   Kucerova, Z.   Bernhard, J.   Ceccucci, A.   Danielsson, H.   De Simone, N.   Duval, F.   Dobrich, B.   Federici, L.   Gamberini, E.   Gatignon, L.   Guida, R.   Hahn, F.   Holzer, E. B.   Jenninger, B.   Koval, M.   Laycock, P.   Miotto, G. Lehmann   Lichard, P.   Mapelli, A.   Marchevski, R.   Massri, K.   Noy, M.   Palladino, V.   Perrin-Terrin, M.   Pinzino, J.   Ryjov, V.   Schuchmann, S.   Venditti, S.   Bache, T.   Brunetti, M. B.   Duk, V.   Fascianelli, V.   Fry, J. R.   Gonnella, F.   Goudzovski, E.   Iacobuzio, L.   Lazzeroni, C.   Lurkin, N.   Newson, F.   Parkinson, C.   Romano, A.   Sergi, A.   Sturgess, A.   Swallow, J.   Heath, H.   Page, R.   Trilov, S.   Angelucci, B.   Britton, D.   Graham, C.   Protopopescu, D.   Carmignani, J.   Dainton, J. B.   Jones, R. W. L.   Ruggiero, G.   Fulton, L.   Hutchcroft, D.   Maurice, E.   Wrona, B.   Conovaloff, A.   Cooper, P.   Coward, D.   Rubin, P.  

    The results of a search for (0) decays to a photon and an invisible massive dark photon at the NA62 experiment at the CERN SPS are reported. From a total of 4.12 x 10(8) tagged (0) mesons, no signal is observed. Assuming a kinetic-mixing interaction, limits are set on the dark photon coupling to the ordinary photon as a function of the dark photon mass, improving on previous searches in the mass range 60-110 MeV/c(2). The present results are interpreted in terms of an upper limit of the branching ratio of the electro-weak decay 0improving the current limit by more than three orders of magnitude.
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  • Bounds for massive neutrinos in the region 1 50 GeV from the μ - e conversion experiment

    Numao, T.  

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  • Precision measurement of the ratio of the charged kaon leptonic decay rates

    Lazzeroni, C.   Romano, A.   Ceccucci, A.   Danielsson, H.   Falaleev, V.   Gatignon, L.   Goy Lopez, S.   Hallgren, B.   Maier, A.   Peters, A.   Piccini, M.   Riedler, P.   Frabetti, P. L.   Gersabeck, E.   Kekelidze, V.   Madigozhin, D.   Misheva, M.   Molokanova, N.   Movchan, S.   Potrebenikov, Yu.   Shkarovskiy, S.   Zinchenko, A.   Rubin, P.   Baldini, W.   Ramusino, A. Cotta   Dalpiaz, P.   Fiorini, M.   Gianoli, A.   Norton, A.   Petrucci, F.   Savrie, M.   Bizzeti, A.   Bucci, F.   Iacopini, E.   Lenti, M.   Veltri, M.   Antonelli, A.   Moulson, M.   Raggi, M.   Spadaro, T.   Eppard, K.   Hita-Hochgesand, M.   Kleinknecht, K.   Renk, B.   Wanke, R.   Winhart, A.   Winston, R.   Bolotov, V.   Duk, V.   Gushchin, E.   Ambrosino, F.   Di Filippo, D.   Massarotti, P.   Napolitano, M.   Palladino, V.   Saracino, G.   Anzivino, G.   Imbergamo, E.   Piandani, R.   Sergi, A.   Cenci, P.   Pepe, M.   Costantini, F.   Doble, N.   Giudici, S.   Pierazzini, G.   Sozzi, M.   Venditti, S.   Balev, S.   Collazuol, G.   DiLella, L.   Gallorini, S.   Goudzovski, E.   Lamanna, G.   Mannelli, I.   Ruggiero, G.   Cerri, C.   Fantechi, R.   Kurshetsov, V.   Obraztsov, V.   Popov, I.   Semenov, V.   Yushchenko, O.   D'Agostini, G.   Leonardi, E.   Serra, M.   Valente, P.   Fucci, A.   Salamon, A.   Bloch-Devaux, B.   Peyaud, B.   Engelfried, J.   Coward, D.   Kozhuharov, V.   Litov, L.   Arcidiacono, R.   Bifani, S.   Biino, C.   Dellacasa, G.   Marchetto, F.   Numao, T.   Retiere, F.  

    A precision measurement of the ratio R-K of the rates of kaon leptonic decays K-+/- -> e(+/-)v and K-+/- -> mu(+/-)v with the full data sample collected by the NA62 experiment at CERN in 2007-2008 is reported. The result, obtained by analysing similar to 150 000 reconstructed K-+/- -> e(+/-)v candidates with 11% background contamination, is R-K = (2.488 +/- 0.010) x 10(-5), in agreement with the Standard Model expectation. (c) 2013 Elsevier B.V. All rights reserved.
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  • High purity pion beam at TRIUMF

    Aguilar-Arevalo, A.   Blecher, M.   Bryman, D. A.   Comfort, J.   Doornbos, J.   Doria, L.   Hussein, A.   Ito, N.   Kettell, S.   Kurchaninov, L.   Malbrunot, C.   Marshall, G. M.   Numao, T.   Poutissou, R.   Sher, A.   Walker, B.   Yamada, K.  

    An extension of the TRIUMF M13 low-energy pion channel designed to suppress positrons based on an energy-loss technique is described. A source of beam channel momentum calibration from the decay pi(+) -> e(+) v is also described. (C) 2009 Elsevier B.V. All rights reserved.
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  • First search for K+ -> pi(+) nu(nu)over-bar using the decay-in-flight technique

    Gil, E. Cortina   Minucci, E.   Padolski, S.   Petrov, P.   Velghe, B.   Georgiev, G.   Kozhuharov, V   Litov, L.   Numao, T.   Bryman, D.   Fu, J.   Husek, T.   Kampf, K.   Zamkovsky, M.   Aliberti, R.   Khoriauli, G.   Kunze, J.   Lomidze, D.   Marchevski, R.   Peruzzo, L.   Vormstein, M.   Wanke, R.   Dalpiaz, R.   Fiorini, M.   Gamberini, E.   Neri, I   Norton, A.   Petrucci, F.   Wahl, H.   Ramusino, A. Cotta   Gianoli, A.   Iacopini, E.   Latino, G.   Lenti, M.   Bizzeti, A.   Bucci, F.   Volpe, R.   Antonelli, A.   Lamanna, G.   Lanfranchi, G.   Mannocchi, G.   Martellotti, S.   Moulson, M.   Raggi, M.   Spadaro, T.   Ambrosino, F.   Capussela, T.   Corvino, M.   Di Filippo, D.   Massarotti, R.   Mirra, M.   Napolitano, M.   Saracino, G.   Anzivino, G.   Brizioli, F.   Imbergamo, E.   Lollini, R.   Santoni, C.   Barbanera, M.   Cenci, R.   Checcucci, B.   Duk, V   Lubrano, R.   Lupi, M.   Pepe, M.   Piccini, M.   Costantini, F.   Di Lella, L.   Doble, N.   Giorgi, M.   Giudici, S.   Pedreschi, E.   Sozzi, M.   Cerri, C.   Fantechi, R.   Piandani, R.   Pinzino, J.   Pontisso, L.   Spinella, F.   Mannelli, I   D'Agostini, G.   Biagioni, A.   Leonardi, E.   Lonardo, A.   Valente, R.   Vicini, P.   Ammendola, R.   Bonaiuto, V   Federici, L.   Fucci, A.   Salamon, A.   Sargeni, F.   Arcidiacono, R.   Bloch-Devaux, B.   Boretto, M.   Menichetti, E.   Migliore, E.   Soldi, D.   Biino, C.   Filippi, A.   Marchetto, F.   Engelfried, J.   Estrada-Tristan, N.   Bragadireanu, A. M.   Ghinescu, S. A.   Hutanu, O. E.   Enik, T.   Falaleev, V   Kekelidze, V   Korotkova, A.   Madigozhin, D.   Misheva, M.   Molokanova, N.   Movchan, S.   Polenkevich, I   Potrebenikov, Yu   Shkarovskiy, S.   Zinchenko, A.   Fedotov, S.   Gushchin, E.   Khotyantsev, A.   Kleimenova, A.   Kudenko, Y.   Kurochka, V   Medvedeva, M.   Mefodev, A.   Shaikhiev, A.   Kholodenko, S.   Kurshetsov, V   Obraztsov, V   Ostankov, A.   Semenov, V   Sugonyaev, V   Yushchenko, O.   Bician, L.   Blazek, T.   Cerny, V   Koval, M.   Kucerova, Z.   Ceccucci, A.   Danielsson, H.   De Simone, N.   Duval, F.   Doebrich, B.   Gatignon, L.   Guida, R.   Hahn, F.   Jenninger, B.   Laycock, R.   Miotto, G. Lehmann   Lichard, R.   Mapelli, A.   Massri, K.   Noy, M.   Palladino, V   Perrin-Terrin, M.   Ryjov, V   Venditti, S.   Brunetti, M. B.   Fascianelli, V   Gonnella, F.   Goudzovski, E.   Iacobuzio, L.   Lazzeroni, C.   Lurkin, N.   Newson, F.   Parkinson, C.   Romano, A.   Sergi, A.   Sturgess, A.   Swallow, J.   Heath, H.   Page, R.   Trilov, S.   Angelucci, B.   Britton, D.   Graham, C.   Protopopescu, D.   Dainton, J. B.   Fry, J. R.   Fulton, L.   Hutchcroft, D.   Maurice, E.   Ruggiero, G.   Wrona, B.   Conovaloff, A.   Cooper, R.   Coward, D.   Rubin, R.  

    The NA62 experiment at the CERN SPS reports the first search for K+ -> pi(+) nu(nu) over bar using the decay-in-flight technique, based on a sample of 1.21 x10(11) K+ decays collected in 2016. The single event sensitivity is 3.15 x10(-10), corresponding to 0.267 Standard Model events. One signal candidate is observed while the expected background is 0.152 events. This leads to an upper limit of 14 x10(-10) on the K+ -> pi(+) nu(nu) over bar branching ratio at 95% CL. (c) 2019 The Author. Published by Elsevier B.V.
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  • Study of a large NaI(Tl) crystal

    Aguilar-Arevalo, A.   Aoki, M.   Blecher, M.   Bryman, D. A.   Doria, L.   Gumplinger, P.   Hussein, A.   Ito, N.   Kettell, S.   Kurchaninov, L.   Littenberg, L.   Malbrunot, C.   Marshall, G. M.   Numao, T.   Poutissou, R.   Sher, A.   Yamada, K.  

    Using a narrow band positron beam, the response of a large high-resolution NaI(Tl) crystal to an incident positron beam was measured. It was found that nuclear interactions cause the appearance of additional peaks in the low energy tail of the deposited energy spectrum. (C) 2010 Elsevier B.V. All rights reserved.
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  • The PIENU experiment at TRIUMF: a sensitive probe for new physics

    Malbrunot, Chloe   Aguilar-Arevalo, A. A.   Aoki, M.   Blecher, M.   Britton, D. I.   Bryman, D. A.   Chen, S.   Comfort, J.   Ding, M.   Doornbos, J.   Doria, L.   Gumplinger, P.   Hurst, C.   Hussein, A.   Igarashi, Y.   Ito, N.   Kettell, S.   Kuno, Y.   Kurchaninov, L.   Littenberg, L.   Numao, T.   Poutissou, R.   Sher, A.   Sullivan, T.   Vavilov, D.   Yamada, K.   Yoshida, M.  

    Study of rare decays is an important approach for exploring physics beyond the Standard Model (SM). The branching ratio of the helicity suppressed pion decays, R = Gamma(pi(+) -> e(+)v(c)+pi(+)-> e(+)v(c)gamma/Gamma(pi(+) ->mu(+) v(mu)+pi+-> v(mu)gamma), is one of the most accurately calculated decay process involving hadrons and has so far provided the most stringent test of the hypothesis of electron-muon universality in weak interactions. The branching ratio has been calculated in the SM to better than 0.01% accuracy to be R(SM) = 1.2353(1) x 10(4). The PIENU experiment at TRIUMF, which started taking physics data in September 2009, aims to reach an accuracy five times better than the previous experiments, so as to confront the theoretical calculation at the level of +/- 0.1%. If a deviation from the R(SM) is found, "new physics" beyond the SM, at potentially very high mass scales (up to 1000 TeV), could be revealed. Alternatively, sensitive constraints on hypotheses can be obtained for interactions involving pseudoscalar or scalar interactions. So far, 4 million pi(+) -> e(+)v(e) events have been accumulated by PIENU. This paper will outline the physics motivations, describe the apparatus and techniques designed to achieve high precision and present the latest results.
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  • Neutral pion form factor measurement by the NA62 experiment

    Zamkovsky, Michal   Ambrosino, F.   Antonelli, A.   Anzivino, G.   Arcidiacono, R.   Baldini, W.   Balev, S.   Batley, J. R.   Behler, M.   Bifani, S.   Biino, C.   Bizzeti, A.   Blazek, T.   Bloch-Devaux, B.   Bocquet, G.   Bolotov, V.   Bucci, F.   Cabibbo, N.   Calvetti, M.   Cartiglia, N.   Ceccucci, A.   Cenci, P.   Cerri, C.   Cheshkov, C.   Chze, J. B.   Clemencic, M.   Collazuol, G.   Costantini, F.   Ramusino, A. Cotta   Coward, D.   Cundy, D.   Dabrowski, A.   DAgostini, G.   Dalpiaz, P.   Damiani, C.   Danielsson, H.   De Beer, M.   Dellacasa, G.   Derr, J.   Dibon, H.   Di Filippo, D.   DiLella, L.   Doble, N.   Duk, V.   Engelfried, J.   Eppard, K.   Falaleev, V.   Fantechi, R.   Fidecaro, M.   Fiorini, L.   Fiorini, M.   Martin, T. Fonseca   Frabetti, P. L.   Fucci, A.   Gallorini, S.   Gatignon, L.   Gersabeck, E.   Gianoli, A.   Giudici, S.   Gonidec, A.   Goudzovski, E.   Lopez, S. Goy   Gushchin, E.   Hallgren, B.   Hita-Hochgesand, M.   Holder, M.   Hristov, P.   Iacopini, E.   Imbergamo, E.   Jeitler, M.   Kalmus, G.   Kekelidze, V.   Kleinknecht, K.   Koval, M.   Kozhuharov, V.   Kubischta, W.   Kurshetsov, V.   Lamanna, G.   Lazzeroni, C.   Lenti, M.   Leonardi, E.   Litov, L.   Lurkin, N.   Madigozhin, D.   Maier, A.   Mannelli, I.   Marchetto, F.   Marel, G.   Markytan, M.   Marouelli, P.   Martini, M.   Masetti, L.   Massarotti, P.   Mazzucato, E.   Michetti, A.   Mikulec, I.   Misheva, M.   Molokanova, N.   Monnier, E.   Moosbrugger, U.   Morales, C. Morales   Moulson, M.   Movchan, S.   Munday, D. J.   Napolitano, M.   Nappi, A.   Neuhofer, G.   Norton, A.   Numao, T.   Obraztsov, V.   Palladino, V.   Patel, M.   Pepe, M.   Peters, A.   Petrucci, F.   Petrucci, M. C.   Peyaud, B.   Piandani, R.   Piccini, M.   Pierazzini, G.   Polenkevich, I.   Popov, I.   Potrebenikov, Y.   Raggi, M.   Renk, B.   Retire, F.   Riedler, P.   Romano, A.   Rubin, P.   Ruggiero, G.   Salamon, A.   Saracino, G.   Savri, M.   Scarpa, M.   Semenov, V.   Sergi, A.   Serra, M.   Shieh, M.   Shkarovskiy, S.   Slater, M. W.   Sozzi, M.   Spadaro, T.   Stoynev, S.   Swallow, E.   Szleper, M.   Valdata-Nappi, M.   Valente, P.   Vallage, B.   Velasco, M.   Veltri, M.   Venditti, S.   Wache, M.   Wahl, H.   Walker, A.   Wanke, R.   Widhalm, L.   Winhart, A.   Winston, R.   Wood, M. D.   Wotton, S. A.   Yushchenko, O.   Zinchenko, A.   Ziolkowski, M.  

    The NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007. The kaon beam represents a source of tagged neutral pion decays in vacuum. A measurement of the electromagnetic transition form factor slope of the neutral pion in the time-like region from similar to 1 million fully reconstructed pi(0) Dalitz decay is presented. The limits on dark photon production in pi(0) decays from the earlier kaon experiment at CERN, NA48/2, are also reported.
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  • Test of lepton flavour universality in K(+) -> l(+)nu decays RID F-3326-2011 RID A-4071-2012 RID A-6640-2010

    Lazzeroni, C.   Romano, A.   Ceccucci, A.   Danielsson, H.   Falaleev, V.   Gatignon, L.   Lopezl, S. Goy   Hallgren, B.   Maier, A.   Peters, A.   Piccini, M.   Riedler, P.   Dyulendarova, M.   Frabetti, P. L.   Kekelidze, V.   Madigozhin, D.   Marinova, E.   Molokanova, N.   Movchan, S.   Potrebenikov, Yu.   Shkarovskiy, S.   Zinchenko, A.   Rubin, P.   Baldini, W.   Ramusino, A. Cotta   Dalpiaz, P.   Fiorini, M.   Gianoli, A.   Norton, A.   Petrucci, F.   Savrie, M.   Wahl, H.   Bizzeti, A.   Bucci, F.   Iacopini, E.   Lenti, M.   Veltri, M.   Eppard, K.   Hita-Hochgesand, M.   Kleinknecht, K.   Renk, B.   Wanke, R.   Winhart, A.   Winston, R.   Olotov, V.   Duk, V.   Gushchin, E.   Ambrosino, F.   Di Filippo, D.   Massarotti, P.   Napolitano, M.   Palladino, V.   Saracino, G.   Anzivino, G.   Imbergamo, E.   Piandani, R.   Sergi, A.   Cenci, P.   Pepe, M.   Costantini, F.   Doble, N.   Giudici, S.   Pierazzini, G.   Sozzi, M.   Venditti, S.   Balev, S.   Collazuol, G.   DiLeila, L.   Gallorini, S.   Goudzovski, E.   Lamanna, G.   Marinelli, I.   Ruggiero, G.   Cerri, C.   Fantechi, R.   Kurshetsov, V.   Obraztsov, V.   Popov, I.   Semenov, V.   Yushchenko, O.   D'Agostini, G.   Leonardi, E.   Serra, M.   Valente, P.   Fucci, A.   Salamon, A.   Bloch-Devaux, B.   Peyaud, B.   Engelfried, J.   Coward, D.   Kozhuharov, V.   Litov, L.   Arcidiacono, R.   Bifani, S.   Biino, C.   Dellacasa, G.   Marchetto, F.   Numao, T.   Retiere, F.  

    A precision test of lepton flavour universality has been performed by measuring the ratio R(K) of kaon leptonic decay rates K(+) -> e(+)nu) and K(+) -> mu(+)nu) in a sample of 59 813 reconstructed K(+) -> e(+)nu candidates with (8.71 +/- 0.24)% background contamination. The result R(K) = (2.487 +/- 0.013) x 10(-5) is in agreement with the Standard Model expectation. (C) 2011 Elsevier B.V. All rights reserved.
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  • Massive Neutrino Search in the Decay pi(+) -> e(+)nu

    Malbrunot, C.   Aoki, M.   Blecher, M.   Bryman, D. A.   Chen, S.   Ding, M.   Doria, L.   Gumplinger, P.   Hurst, C.   Hussein, A.   Igarashi, Y.   Ito, N.   Kettell, S. H.   Kurchaninov, L.   Littenberg, L.   Numao, T.   Poutissou, R.   Sher, A.   Sullivan, T.   Vavilov, D.   Yamada, K.   Yoshida, M.  

    Evidence of massive neutrinos in the pi(+) -> e(+)nu decay spectrum was sought with the background pi(+) -> mu(+) -> e(+) decay chain highly suppressed. Upper limits (90 % C. L.) on the neutrino mixing matrix element vertical bar U-ei vertical bar(2) in the neutrino mass region 60-129 MeV/c(2) were set at the level of 10(-8).
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  • Dual scanning scheme for ferroelectric liquid crystal display

    Tagawa, A.   Katsuse, H.   Bonnett, P.   Numao, T.  

    The dual scanning scheme (DSS) for ferroelectric liquid crystal displays (FLCDs) has been investigated. In DSS, two scanning electrodes are simultaneously selected and pixels on the two electrodes are switched to the black or white state in one unit time. We have investigated a DSS waveform set in which selected periods of two selected electrodes are duplicated. We found that the use of tau-V min mode FLC materials and the appropriate driving waveform set enables the simultaneous selection of two scanning electrodes and control of the FLC layers
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  • Measurement of the Pion Branching Ratio at TRIUMF

    Malbrunot, C.   Aguilar-Arevalo, A. A.   Aoki, M.   Blecher, M.   Britton, D. I.   Bryman, D. A.   Chen, S.   Comfort, J.   Ding, M.   Doria, L.   Gumplinger, P.   Hussein, A.   Igarashi, Y.   Ito, S.   Kettell, S. H.   Kuno, Y.   Kurchaninov, L.   Littenberg, L.   Numao, T.   Sher, A.   Sullivan, T.   Vavilov, D.   Yoshida, M.  

    The branching ratio of pion decays, R = Gamma(pi(+) -> e(+) v(e) + pi(+) -> e(+) v(e)gamma)/Gamma(pi(+) -> mu(+) v(mu) + pi(+) -> mu(+) v(mu)gamma) is one of the most accurately calculated decay processes involving hadrons and has provided one of the most stringent tests of the hypothesis of electron-muon universality in weak interactions. The current experimental branching ratio R-exp = (1.230 +/- 0.004) x 10(-4) is 40 times less precise than the theoretical prediction R-SM = 1.2352(1) x 10(-4). The TRIUMF PIENU experiment aims at measuring the pion branching ratio with a precision improved by at least a factor five.
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