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  • 1. Babaev, Egor
    Nonlinear sigma model approach for phase disorder transitions in chiral Gross-Neveu, Nambu-Jona-Lasinio models and strong-coupling superconductors2001In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 16, no 7, p. 1175-1197Article, review/survey (Refereed)
    Abstract [en]

    We briefly review the nonlinear sigma model approach for the subject of increasing interest: two-step phase transitions in the Gross-Neveu and the modified Nambu-Jona-Lasinio models at low N and condensation from pseudogap phase in strong-coupling superconductors. Recent success in describing of Bose-type superconductors that possess two characteristic temperatures and a pseudogap above T, is the develop ment approximately comparable with the BCS theory. One can expect that it should have influence on high-energy physics, similar to impact of the BCS theory on this subject. Although first generalizations of this concept to particle physics were made recently, these results were not systematized. In this review we summarize this development and discuss similarities and differences of the appearance of the pseudogap phase in superconductors and the Gross-Neveu and Nambu-Jona-Lasinio-like models. We discuss its possible relevance for chiral phase transition in QCD and color superconductors. This paper is organized in three parts. In the first part, we briefly review the separation of temperatures of pair formation and pair condensation in strong-coupling and low carrier density superconductors (i.e. the formation of the pseudogap phase). The second part is a review of nonlinear sigma model approach to an analogous phenomenon in the chiral Gross-Neveu model at small N. In the third part we discuss the modified Nambu-Jona-Lasinio model where the chiral phase transition is accompanied by a formation of a phase analogous to the pseudogap phase.

  • 2.
    Carlson, Per
    KTH, School of Engineering Sciences (SCI), Physics.
    PAMELA science2005In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 20, no 29, p. 6731-6734Article in journal (Refereed)
    Abstract [en]

    The PAMELA satellite-borne experimenti, to be launched in 2005, is a powerful spectrometer including a magnetic field tracker and particle identification detectors. PAMELA science is broad and includes studies of interstellar propagation, solar modulation and search for dark matter signals.

  • 3.
    Di Vecchia, Paolo
    KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
    My interaction with Stanley2017In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 32, no 12, article id 1740019Article in journal (Refereed)
  • 4.
    Langmann, Edwin
    KTH, School of Engineering Sciences (SCI), Physics, Mathematical Physics. KTH, School of Engineering Sciences (SCI), Physics, Condensed Matter Theory.
    The geometric phase and the Schwinger term in some models1992In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 7, no 21, p. 5045-5083Article in journal (Refereed)
  • 5. Liu, Xue-Wen
    et al.
    Zhou, Shun
    KTH, School of Engineering Sciences (SCI), Theoretical Physics.
    Texture zeros for dirac neutrinos and current experimental tests2013In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 28, no 12, p. 1350040-Article in journal (Refereed)
    Abstract [en]

    The Daya Bay and RENO reactor neutrino experiments have revealed that the smallest neutrino mixing angle is in fact relatively large, i.e. theta(13) approximate to 9 degrees. Motivated by this exciting progress, we perform a systematic study of the neutrino mass matrix M-nu with one or two texture zeros, in the assumption that neutrinos are Dirac particles. Among 15 possible patterns with two texture zeros, only three turn out to be favored by current neutrino oscillation data at the 3 sigma level. Although all the six patterns with one texture zero are compatible with the experimental data at the 3 sigma level, the parameter space of each pattern is strictly constrained. Phenomenological implications of M-nu on the leptonic CP violation and neutrino mass spectrum are explored, and the stability of texture zeros against the radiative corrections is also discussed.

  • 6. Stozhkov, Y. I.
    et al.
    Basili, A.
    Bencardino, R.
    Casolino, M.
    de Pascale, M. P.
    Furano, G.
    Menicucci, A.
    Minori, M.
    Morselli, A.
    Picozza, P.
    Sparvoli, R.
    Wischnewski, R.
    Bakaldin, A.
    Galper, A. M.
    Koldashov, S. V.
    Korotkov, M. G.
    Mikhailov, V. V.
    Voronov, S. A.
    Yurkin, Y. T.
    Adriani, O.
    Bonechi, L.
    Bongi, M.
    Papini, P.
    Ricciarini, S. B.
    Spillantini, P.
    Straulino, S.
    Taccetti, F.
    Vannuccini, E.
    Castellini, G.
    Boezio, M.
    Bonvicini, M.
    Mocchiutti, E.
    Schiavon, P.
    Vacchi, A.
    Zampa, G.
    Zampa, N.
    Carlson, Per
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Lund, Jens
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Lundquist, Johan
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Orsi, Silvio
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Pearce, Mark
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Barbarino, G. C.
    Campana, D.
    Osteria, G.
    Rossi, G.
    Russo, S.
    Boscherini, M.
    Mennh, W.
    Simonh, M.
    Bongiorno, L.
    Ricci, M.
    Ambriola, M.
    Bellotti, R.
    Cafagna, F.
    Circella, M.
    de Marzo, C.
    Giglietto, N.
    Mirizzi, N.
    Romita, M.
    Spinelli, P.
    Bogomolov, E.
    Krutkov, S.
    Vasiljev, G.
    Bazilevskaya, G. A.
    Kvashnin, A. N.
    Logachev, V. I.
    Makhmutov, V. S.
    Maksumov, O. S.
    Mitchell, J. W.
    Streitmatter, R. E.
    Stochaj, S. J.
    About Separation of Hadron and Electromagnetic Cascades in the Pamela Calorimeter2005In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 20, no 29, p. 6745-6748Article in journal (Refereed)
    Abstract [en]

    Results of calibration of the PAMELA instrument at the CERN facilities are discussed. In September, 2003, the calibration of the Neutron Detector together with the Calorimeter was performed with the CERN beams of electrons and protons with energies of 20-180 GeV. The implementation of the Neutron Detector increases a rejection factor of hadrons from electrons about ten times. The results of calibration are in agreement with calculations.

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