Investigation of electron and positron spectrum expected by dark matter for the CALET experiment

T. Aiba, A. Kato, Shoji Torii, J. Chang

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    The PAMELA experiment has recently reported that the e+/(e+ +e-) increases apparently over 10 GeV. The electron (and positron) excess, furthermore, is observed at energies between 300 and 800 GeV in ATIC and PPB-BETS. Since these results are hardly understood in consistent only by an acceleration at SNR, many papers indicate new sources, such as WIMP and/or nearby pulsars, have been published. We have carried out a calculation of the cosmic-ray electrons and positrons by using the GALPROP code to understand these results. We try to determine an optimum candidate of the WIMP model by comparing to the observed spectra. We test KK particles which dilectly produced an electron and positron pair by annihilation or decay. A wino-like particle is also examined. It is shown the annihilation of KK particle is compatible with the present data. The CALET mission is planned for searching the nearby cosmic ray sources and the dark matter candidates at energies over 100 GeV. We will present an expected capability of CALET to distinguish the models by the excellent energy resolution over 100 GeV (∼ 2%) for the 5-year observation.

    Original languageEnglish
    Title of host publication31st International Cosmic Ray Conference, ICRC 2009
    PublisherUniversity of Lodz
    Publication statusPublished - 2009
    Event31st International Cosmic Ray Conference, ICRC 2009 - Lodz
    Duration: 2009 Jul 72009 Jul 15

    Other

    Other31st International Cosmic Ray Conference, ICRC 2009
    CityLodz
    Period09/7/709/7/15

    Fingerprint

    positrons
    dark matter
    weakly interacting massive particles
    cosmic rays
    electrons
    pulsars
    energy
    decay

    Keywords

    • Dark matter
    • GALPROP

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Aiba, T., Kato, A., Torii, S., & Chang, J. (2009). Investigation of electron and positron spectrum expected by dark matter for the CALET experiment. In 31st International Cosmic Ray Conference, ICRC 2009 University of Lodz.

    Investigation of electron and positron spectrum expected by dark matter for the CALET experiment. / Aiba, T.; Kato, A.; Torii, Shoji; Chang, J.

    31st International Cosmic Ray Conference, ICRC 2009. University of Lodz, 2009.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Aiba, T, Kato, A, Torii, S & Chang, J 2009, Investigation of electron and positron spectrum expected by dark matter for the CALET experiment. in 31st International Cosmic Ray Conference, ICRC 2009. University of Lodz, 31st International Cosmic Ray Conference, ICRC 2009, Lodz, 09/7/7.
    Aiba T, Kato A, Torii S, Chang J. Investigation of electron and positron spectrum expected by dark matter for the CALET experiment. In 31st International Cosmic Ray Conference, ICRC 2009. University of Lodz. 2009
    Aiba, T. ; Kato, A. ; Torii, Shoji ; Chang, J. / Investigation of electron and positron spectrum expected by dark matter for the CALET experiment. 31st International Cosmic Ray Conference, ICRC 2009. University of Lodz, 2009.
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    AU - Kato, A.

    AU - Torii, Shoji

    AU - Chang, J.

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    Y1 - 2009

    N2 - The PAMELA experiment has recently reported that the e+/(e+ +e-) increases apparently over 10 GeV. The electron (and positron) excess, furthermore, is observed at energies between 300 and 800 GeV in ATIC and PPB-BETS. Since these results are hardly understood in consistent only by an acceleration at SNR, many papers indicate new sources, such as WIMP and/or nearby pulsars, have been published. We have carried out a calculation of the cosmic-ray electrons and positrons by using the GALPROP code to understand these results. We try to determine an optimum candidate of the WIMP model by comparing to the observed spectra. We test KK particles which dilectly produced an electron and positron pair by annihilation or decay. A wino-like particle is also examined. It is shown the annihilation of KK particle is compatible with the present data. The CALET mission is planned for searching the nearby cosmic ray sources and the dark matter candidates at energies over 100 GeV. We will present an expected capability of CALET to distinguish the models by the excellent energy resolution over 100 GeV (∼ 2%) for the 5-year observation.

    AB - The PAMELA experiment has recently reported that the e+/(e+ +e-) increases apparently over 10 GeV. The electron (and positron) excess, furthermore, is observed at energies between 300 and 800 GeV in ATIC and PPB-BETS. Since these results are hardly understood in consistent only by an acceleration at SNR, many papers indicate new sources, such as WIMP and/or nearby pulsars, have been published. We have carried out a calculation of the cosmic-ray electrons and positrons by using the GALPROP code to understand these results. We try to determine an optimum candidate of the WIMP model by comparing to the observed spectra. We test KK particles which dilectly produced an electron and positron pair by annihilation or decay. A wino-like particle is also examined. It is shown the annihilation of KK particle is compatible with the present data. The CALET mission is planned for searching the nearby cosmic ray sources and the dark matter candidates at energies over 100 GeV. We will present an expected capability of CALET to distinguish the models by the excellent energy resolution over 100 GeV (∼ 2%) for the 5-year observation.

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