Dark matter constraints from an observation of dSphs and the LMC with the Baikal NT200


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We have analyzed the neutrino events recoded in the deep-water neutrino experiment NT200 in Lake Baikal in five years of observations toward dark dwarf spheroidal galaxies (dSphs) in the southern hemisphere and the Large Magellanic Cloud (LMC). This analysis completes the series of works based on NT200 data in the search for a dark matter annihilation signal in astrophysical objects. We have found no significant excess in the number of observed events relative to the expected background from atmospheric neutrinos in all tested directions, in 22 dSphs and the LMC. For a sample of five selected dwarf galaxies we have performed a joint analysis of the data by the maximum likelihood method. We have obtained a correspondence of the observational data to the null hypothesis about the presence of only background events and established 90% confidence-level upper limits for the annihilation cross sections of dark matter particles with a mass from 30 GeV to 10 TeV in several annihilation channels both in the joint analysis of the selected sample of galaxies and in the analysis toward the LMC. The strongest constraints at a level of 7 × 10–21 cm3 s–1 have been obtained for the direction toward the LMC in the channel of annihilation into a pair of neutrinos.

作者简介

A. Avrorin

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

A. Avrorin

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

V. Aynutdinov

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

R. Bannasch

EvoLogics GmbH

Email: suvorova@cpc.inr.ac.ru
德国, Berlin, 13355

I. Belolaptikov

Joint Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Dubna, Moscow obl., 141980

V. Brudanin

Joint Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Dubna, Moscow obl., 141980

N. Budnev

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

I. Danilchenko

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

S. Demidov

Institute for Nuclear Research

编辑信件的主要联系方式.
Email: demidov@ms2.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

G. Domogatsky

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

A. Doroshenko

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

R. Dvornicky

Joint Institute for Nuclear Research; Comenius University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Dubna, Moscow obl., 141980; Bratislava, SK-842 48

A. Dyachok

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

Zh.-A. Dzhilkibaev

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

L. Fajt

Comenius University; Czech Technical University in Prague

Email: suvorova@cpc.inr.ac.ru
斯洛伐克, Bratislava, SK-842 48; Prague, 12800

S. Fialkovsky

Alekseev Nizhny Novgorod State Technical University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Nizhny Novgorod, 603950

R. Gafarov

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

O. Gaponenko

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

K. Golubkov

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

T. Gress

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

Z. Honz

Joint Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Dubna, Moscow obl., 141980

K. Kebkal

EvoLogics GmbH

Email: suvorova@cpc.inr.ac.ru
德国, Berlin, 13355

O. Kebkal

EvoLogics GmbH

Email: suvorova@cpc.inr.ac.ru
德国, Berlin, 13355

K. Konishchev

Joint Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Dubna, Moscow obl., 141980

A. Korobchenko

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

A. Koshechkin

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

F. Koshel

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

A. Kozhin

Skobeltsyn Institute of Nuclear Physics

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Moscow, 117312

V. Kulepov

Alekseev Nizhny Novgorod State Technical University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Nizhny Novgorod, 603950

D. Kuleshov

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

M. Milenin

Alekseev Nizhny Novgorod State Technical University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Nizhny Novgorod, 603950

R. Mirgazov

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

E. Osipova

Skobeltsyn Institute of Nuclear Physics

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Moscow, 117312

A. Panfilov

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

L. Pan’kov

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

E. Pliskovsky

Joint Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Dubna, Moscow obl., 141980

M. Rozanov

St. Petersburg State Marine Technical University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, St. Petersburg, 190008

E. Rjabov

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

B. Shaybonov

Joint Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Dubna, Moscow obl., 141980

A. Sheifler

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

M. Shelepov

Institute for Nuclear Research

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

A. Skurihin

Skobeltsyn Institute of Nuclear Physics

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Moscow, 117312

O. Suvorova

Institute for Nuclear Research

编辑信件的主要联系方式.
Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, pr. 60-letiya Oktyabrya 7a, Moscow, 119991

V. Tabolenko

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

B. Tarashchansky

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

S. Yakovlev

EvoLogics GmbH

Email: suvorova@cpc.inr.ac.ru
德国, Berlin, 13355

A. Zagorodnikov

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

V. Zurbanov

Irkutsk State University

Email: suvorova@cpc.inr.ac.ru
俄罗斯联邦, Irkutsk, 664003

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