Publications
294 results found
Schael S, Barate R, Brunelière R, et al., 2006, Precision electroweak measurements on the Z resonance, PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, Vol: 427, Pages: 257-454, ISSN: 0370-1573
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- Citations: 1388
Araki T, Enomoto S, Furuno K, et al., 2006, Search for the invisible decay of neutrons with KamLAND., Phys Rev Lett, Vol: 96, ISSN: 0031-9007
The Kamioka Liquid scintillator Anti-Neutrino Detector is used in a search for single neutron or two-neutron intranuclear disappearance that would produce holes in the -shell energy level of (12)C nuclei. Such holes could be created as a result of nucleon decay into invisible modes (inv), e.g., n--> 3v or nn--> 2v. The deexcitation of the corresponding daughter nucleus results in a sequence of space and time-correlated events observable in the liquid scintillator detector. We report on new limits for one- and two-neutron disappearance: tau(n--> inv) > 5.8 x 10(29) years and tau (nn--> inv) > 1.4 x 10(30) years at 90% C.L. These results represent an improvement of factors of approximately 3 and >10(4) and over previous experiments.
Uchida Y, Taylor I, Vachert A, et al., 2006, UK Contributions to the T2K Experiment: Case for Support.
Araki T, Enomoto S, Furuno K, et al., 2005, Experimental investigation of geologically produced antineutrinos with KamLAND, NATURE, Vol: 436, Pages: 499-503, ISSN: 0028-0836
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- Citations: 285
Araki T, Eguchi K, Enomoto S, et al., 2005, Measurement of neutrino oscillation with KamLAND: evidence of spectral distortion., Phys Rev Lett, Vol: 94, ISSN: 0031-9007
We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 nu (e) candidate events with energies above 3.4 MeV compared to 365.2+/-23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8+/-7.3 expected background events, the statistical significance for reactor nu (e) disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from nu (e) oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Deltam(2)=7.9(+0.6)(-0.5)x10(-5) eV(2). A global analysis of data from KamLAND and solar-neutrino experiments yields Deltam(2)=7.9(+0.6)(-0.5)x10(-5) eV(2) and tan((2)theta=0.40(+0.10)(-0.07), the most precise determination to date.
Araki T, Eguchi K, Enomoto S, et al., 2005, Measurement of neutrino oscillation with KamLAND: Evidence of spectral distortion, PHYSICAL REVIEW LETTERS, Vol: 94, ISSN: 0031-9007
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- Citations: 900
Eguchi K, Enomoto S, Furuno K, et al., 2004, High sensitivity search for nu;e's from the sun and other sources at KamLAND., Phys Rev Lett, Vol: 92, ISSN: 0031-9007
Data corresponding to a KamLAND detector exposure of 0.28 kton yr has been used to search for nu;(e)'s in the energy range 8.3<E(nu;(e))<14.8 MeV. No candidates were found for an expected background of 1.1+/-0.4 events. This result can be used to obtain a limit on nu;(e) fluxes of any origin. Assuming that all nu;(e) flux has its origin in the Sun and has the characteristic 8B solar nu(e) energy spectrum, we obtain an upper limit of 3.7 x 10(2) cm(-2) s(-1) (90% C.L.) on the nu;(e) flux. We interpret this limit, corresponding to 2.8 x 10(-4) of the standard solar model 8B nu(e) flux, in the framework of spin-flavor precession and neutrino decay models.
Eguchi K, Enomoto S, Furuno K, et al., 2004, High sensitivity search for (ν)over-bar<i><sub>e</sub></i>'s from the Sun and other sources at KamLAND -: art. no. 071301, PHYSICAL REVIEW LETTERS, Vol: 92, ISSN: 0031-9007
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- Citations: 139
Eguchi K, Enomoto S, Furuno K, et al., 2003, First results from KamLAND: evidence for reactor antineutrino disappearance., Phys Rev Lett, Vol: 90, ISSN: 0031-9007
KamLAND has measured the flux of nu;(e)'s from distant nuclear reactors. We find fewer nu;(e) events than expected from standard assumptions about nu;(e) propagation at the 99.95% C.L. In a 162 ton.yr exposure the ratio of the observed inverse beta-decay events to the expected number without nu;(e) disappearance is 0.611+/-0.085(stat)+/-0.041(syst) for nu;(e) energies >3.4 MeV. In the context of two-flavor neutrino oscillations with CPT invariance, all solutions to the solar neutrino problem except for the "large mixing angle" region are excluded.
Eguchi K, Enomoto S, Furuno K, et al., 2003, First results from KamLAND: Evidence for reactor antineutrino disappearance, PHYSICAL REVIEW LETTERS, Vol: 90, ISSN: 0031-9007
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- Citations: 2267
Beuselinck R, Binnie DM, Cameron W, et al., 2003, Search for the Standard Model Higgs boson at LEP, Physics Letters B, Vol: 565, Pages: 61-75, ISSN: 0370-2693
Uchida Y, 2003, First results from KamLand, La Thuile 2003: results and perspectives in particle physics, 9 - 15 March 2003, Pages: 65-76
Detwiler J, Gratta G, Tolich N, et al., 2002, Nuclear propelled vessels and neutrino oscillation experiments, PHYSICAL REVIEW LETTERS, Vol: 89, ISSN: 0031-9007
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- Citations: 6
Achard P, Adriani O, Aguilar-Benitez M, et al., 2002, Bose-Einstein correlations of neutral and charged pions in hadronic Z decays, PHYSICS LETTERS B, Vol: 524, Pages: 55-64, ISSN: 0370-2693
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- Citations: 27
Suekane F, Eguchi K, Enomoto S, et al., 2002, Recent status of the KamLAND experiment, Nuclear Physics B - Proceedings Supplements, Vol: 112, Pages: 128-132, ISSN: 0920-5632
The KamLAND experiment is a very long baseline reactor ̄ne oscillation experiment. This experiment has sensitivity to the oscillation parameters Δℳ2 > 10-5 eV2 and sin2θ > 0.2, using reactor ̄ne which come typically from 170km away. This sensitive region completely covers the currently most favored MSW-LMA solution for the solar neutrino deficit problem. After 5 years of detector construction, the data taking started successfully in Jan. 2002. The detector performance is sufficient to perform reactor ̄ne physics and we expect the first physics result will come out soon. In this paper, the KamLAND detector, its expected sensitivities, history, and recent progress since the time of the conference, are briefly described.
Achard P, Adriani O, Aguilar-Benitez M, et al., 2001, Measurement of the topological branching fractions of the τ lepton at LEP, PHYSICS LETTERS B, Vol: 519, Pages: 189-198, ISSN: 0370-2693
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- Citations: 6
Acciarri M, Achard P, Adriani O, et al., 2001, Total cross section in γ γ collisions at LEP, PHYSICS LETTERS B, Vol: 519, Pages: 33-45, ISSN: 0370-2693
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- Citations: 49
Achard P, Adriani O, Aguilar-Benitez M, et al., 2001, Standard model Higgs boson with the L3 experiment at LEP, PHYSICS LETTERS B, Vol: 517, Pages: 319-331, ISSN: 0370-2693
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- Citations: 51
Achard P, Adriani O, Aguilar-Benitez M, et al., 2001, Search for heavy isosinglet neutrino in e<SUP>+</SUP>e<SUP>-</SUP> annihilation at LEP, PHYSICS LETTERS B, Vol: 517, Pages: 67-74, ISSN: 0370-2693
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- Citations: 70
Achard P, Adriani O, Aguilar-Benitez M, et al., 2001, Search for heavy neutral and charged leptons in e<SUP>+</SUP>e<SUP>-</SUP> annihilation at LEP, PHYSICS LETTERS B, Vol: 517, Pages: 75-85, ISSN: 0370-2693
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- Citations: 146
Acciarri M, Achard P, Adriani O, et al., 2001, Measurement of the charm production cross section in γ γ collisions at LEP, PHYSICS LETTERS B, Vol: 514, Pages: 19-28, ISSN: 0370-2693
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- Citations: 23
Acciarri M, Achard P, Adriani O, et al., 2001, Search for the Standard Model Higgs boson in e<SUP>+</SUP>e<SUP>-</SUP> collisions at √<i>s</i> up to 202 GeV, PHYSICS LETTERS B, Vol: 508, Pages: 225-236, ISSN: 0370-2693
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- Citations: 20
Acciarri M, Achard P, Adriani O, et al., 2001, Measurement of the tau branching fractions into leptons, PHYSICS LETTERS B, Vol: 507, Pages: 47-60, ISSN: 0370-2693
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- Citations: 13
Acciarri M, Achard P, Adriani O, et al., 2001, Study of the e+e- → Zγγ → q(q)over-barγγ process at LEP, PHYSICS LETTERS B, Vol: 505, Pages: 47-58, ISSN: 0370-2693
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- Citations: 7
Acciarri M, Achard P, Adriani O, et al., 2001, Search for neutral Higgs bosons of the minimal supersymmetric standard model in e<SUP>+</SUP>e<SUP>-</SUP> interactions at √<i>s</i>=192-202 GeV, PHYSICS LETTERS B, Vol: 503, Pages: 21-33, ISSN: 0370-2693
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- Citations: 10
Acciarri M, Achard P, Adriani O, et al., 2001, Measurements of the cross sections for open chasm and beauty production in γγ collisions at √<i>s</i>=189-202 GeV, PHYSICS LETTERS B, Vol: 503, Pages: 10-20, ISSN: 0370-2693
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- Citations: 70
Acciarri M, Achard P, Adriani O, et al., 2001, Search for excited leptons in e<SUP>+</SUP>e<SUP>-</SUP> interactions at √<i>s</i>=192-202 GeV, PHYSICS LETTERS B, Vol: 502, Pages: 37-50, ISSN: 0370-2693
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- Citations: 21
Acciarri M, Achard P, Adriani O, et al., 2001, K<sub>S</sub>(0)K<sub>S</sub>(0) final state in two-photon collisions and implications for glueballs, PHYSICS LETTERS B, Vol: 501, Pages: 173-182, ISSN: 0370-2693
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- Citations: 63
Acciarri M, Achard P, Adriani O, et al., 2001, Light resonances in K<sub>S</sub>(0)K<SUP>±</SUP>π<SUP>inverted perpendicular</SUP> and ηπ<SUP>+</SUP>π<SUP>-</SUP> final states in γγ collisions at LEP, PHYSICS LETTERS B, Vol: 501, Pages: 1-11, ISSN: 0370-2693
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- Citations: 58
Acciarri M, Achard P, Adriani O, et al., 2001, Search for R-parity violating decays of supersymmetric particles e<SUP>+</SUP>e<SUP>-</SUP> collisions at √<i>s</i>=189 GeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 19, Pages: 397-414, ISSN: 1434-6044
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- Citations: 14
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