-
S. Adrián-Martínez,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
A. C. Assis Jesus,
T. Astraatmadja, [......],
P. Vernin,
E. Visser,
S. Wagner,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J. Zúniga
[show abstract]
[hide abstract]
ABSTRACT: A search for neutrino-induced muons in correlation with a selection of 40
gamma-ray bursts that occurred in 2007 has been performed with the ANTARES
neutrino telescope. During that period, the detector consisted of 5 detection
lines. The ANTARES neutrino telescope is sensitive to TeV--PeV neutrinos that
are predicted from gamma-ray bursts. No events were found in correlation with
the prompt photon emission of the gamma-ray bursts and upper limits have been
placed on the flux and fluence of neutrinos for different models.
02/2013;
-
ANTARES Collaboration,
S. Adrián-Martinez,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
L. Anton,
S. Anvar,
M. Ardid, [......],
E. Visser,
S. Wagner,
G. Wijnker,
J. Wilms,
E. de Wolf,
K. Yatkin,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J. Zúñiga
[show abstract]
[hide abstract]
ABSTRACT: A search for high-energy neutrinos coming from the direction of the Sun has
been performed using the data recorded by the ANTARES neutrino telescope during
2007 and 2008. The neutrino selection criteria have been chosen to maximize the
selection of possible signals produced by the self-annihilation of weakly
interacting massive particles accumulated in the centre of the Sun with respect
to the atmospheric background. After data unblinding, the number of neutrinos
observed towards the Sun was found to be compatible with background
expectations. The 90\% CL upper limits in terms of spin-dependent and
spin-independent WIMP-proton cross-sections are derived and compared to
predictions of two supersymmetric models, CMSSM and MSSM-7. The ANTARES limits
are competitive with those obtained by other neutrino observatories and are
more stringent than those obtained by direct search experiments for the
spin-dependent WIMP-proton cross-section.
02/2013;
-
[show abstract]
[hide abstract]
ABSTRACT: Large mass ice/water Cherenkov experiments, optimized to detect low energy
(1-20 GeV) atmospheric neutrinos, have the potential to discriminate between
normal and inverted neutrino mass hierarchies. The sensitivity depends on
several model and detector parameters, such as the neutrino flux profile and
normalization, the Earth density profile, the oscillation parameter
uncertainties, and the detector effective mass and resolution. A proper
evaluation of the mass hierarchy discrimination power requires a robust
statistical approach. In this work, the Toy Monte Carlo, based on an extended
unbinned likelihood ratio test statistic, was used. The effect of each model
and detector parameter, as well as the required detector exposure, was then
studied. While uncertainties on the Earth density and atmospheric neutrino flux
profiles were found to have a minor impact on the mass hierarchy
discrimination, the flux normalization, as well as some of the oscillation
parameter (\Delta m^2_{31}, \theta_{13}, \theta_{23}, and \delta_{CP})
uncertainties and correlations resulted critical. Finally, the minimum required
detector exposure, the optimization of the low energy threshold, and the
detector resolutions were also investigated.
01/2013;
-
ANTARES Collaboration,
S. Adrián-Martínez,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
T. Astraatmadja, [......],
P. Vernin,
E. Visser,
S. Wagner,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J. Zúñiga
[show abstract]
[hide abstract]
ABSTRACT: In this paper, a time integrated search for point sources of cosmic neutrinos
is presented using the data collected from 2007 to 2010 by the ANTARES neutrino
telescope. No statistically significant signal has been found and upper limits
on the neutrino flux have been obtained. Assuming an $E_{\nu}^{-2}$ spectrum,
these flux limits are at $1-10\times10^{-8}$ GeV cm$^{-2}$ s$^{-1}$ for
declinations ranging from $-90^{\circ}$ to 40$^{\circ}$. Limits for specific
models of RX J1713.7-3946 and Vela X, which include information on the source
morphology and spectrum, are also given.
07/2012;
-
ANTARES collaboration,
S. Adrian-Martinez,
I. Al Samarai,
A. Albert,
M. Andre,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
T. Astraatmadja, [......],
P. Vernin,
E. Visser,
S. Wagner,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J. Zuniga
[show abstract]
[hide abstract]
ABSTRACT: The data taken with the ANTARES neutrino telescope from 2007 to 2010, a total
live time of 863 days, are used to measure the oscillation parameters of
atmospheric neutrinos. Muon tracks are reconstructed with energies as low as 20
GeV. Neutrino oscillations will cause a suppression of vertical upgoing muon
neutrinos of such energies crossing the Earth. The parameters determining the
oscillation of atmospheric neutrinos are extracted by fitting the event rate as
a function of the ratio of the estimated neutrino energy and reconstructed
flight path through the Earth. Measurement contours of the oscillation
parameters in a two-flavour approximation are derived. Assuming maximum mixing,
a mass difference of $\Delta m_{32}^2=(3.1\pm 0.9)\cdot 10^{-3}$ eV$^2$ is
obtained, in good agreement with the world average value.
06/2012;
-
The ANTARES Collaboration,
the LIGO Scientific Collaboration,
the Virgo Collaboration,
S. Adrián-Martínez,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar, [......],
M. Yvert,
A. Zadroźny,
M. Zanolin,
J. -P. Zendri, F. Zhang,
L. Zhang,
C. Zhao,
N. Zotov,
M. E. Zucker,
J. Zweizig
[show abstract]
[hide abstract]
ABSTRACT: We present the results of the first search for gravitational wave bursts
associated with high energy neutrinos. Together, these messengers could reveal
new, hidden sources that are not observed by conventional photon astronomy,
particularly at high energy. Our search uses neutrinos detected by the
underwater neutrino telescope ANTARES in its 5 line configuration during the
period January - September 2007, which coincided with the fifth and first
science runs of LIGO and Virgo, respectively. The LIGO-Virgo data were analysed
for candidate gravitational-wave signals coincident in time and direction with
the neutrino events. No significant coincident events were observed. We place
limits on the density of joint high energy neutrino - gravitational wave
emission events in the local universe, and compare them with densities of
merger and core-collapse events.
05/2012;
-
J.A. Aguilar,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
A.C. Assis Jesus,
T. Astraatmadja, [......],
G. Vannoni,
M. Vecchi,
P. Vernin,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J.D. Zornoza,
J. Zúñiga
Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 05/2012; · 1.21 Impact Factor
-
S. Adrián-Martínez,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
A.C. Assis Jesus,
T. Astraatmadja, [......],
M. Vecchi,
P. Vernin,
S. Wagner,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J.D. Zornoza,
J. Zúñiga
Astroparticle Physics 04/2012; · 3.22 Impact Factor
-
S. Ando,
B. Baret,
B. Bouhou,
E. Chassande-Mottin, A. Kouchner,
L. Moscoso,
Veronique Van Elewyck,
I. Bartos,
S. Márka,
Z. Márka, [......],
G. Jones,
P. J. Sutton,
S. Kandhasamy,
V. Mandic,
E. Thrane,
K. Kotake,
T. Piran,
T. Pradier,
G. E. Romero,
E. Waxman
[show abstract]
[hide abstract]
ABSTRACT: Many of the astrophysical sources and violent phenomena observed in our
Universe are potential emitters of gravitational waves (GW) and high-energy
neutrinos (HEN). Both GWs and HENs may escape very dense media and travel
unaffected over cosmological distances, carrying information from the innermost
regions of the astrophysical engines. Such messengers could also reveal new,
hidden sources that have not been observed by conventional photon-based
astronomy. Coincident observation of GWs and HENs may thus play a critical role
in multimessenger astronomy. This is particularly true at the present time
owing to the advent of a new generation of dedicated detectors: IceCube,
ANTARES, VIRGO and LIGO. Given the complexity of the instruments, a successful
joint analysis of this data set will be possible only if the expertise and
knowledge of the data is shared between the two communities. This review aims
at providing an overview of both theoretical and experimental state-of-the-art
and perspectives for such a GW+HEN multimessenger astronomy.
03/2012;
-
M. Ageron,
J.A. Aguilar,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
A.C. Assis Jesus, [......],
G. Vannoni,
M. Vecchi,
P. Vernin,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J.D. Zornoza,
J. Zúñiga
Astroparticle Physics 03/2012; · 3.22 Impact Factor
-
S. Adrián-Martínez,
M. Ageron,
J. A. Aguilar,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid, [......],
M. Vecchi,
P. Vernin,
S. Wagner,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J. Zúñiga
[show abstract]
[hide abstract]
ABSTRACT: The ANTARES neutrino telescope, located 40km off the coast of Toulon in the
Mediterranean Sea at a mooring depth of about 2475m, consists of twelve
detection lines equipped typically with 25 storeys. Every storey carries three
optical modules that detect Cherenkov light induced by charged secondary
particles (typically muons) coming from neutrino interactions. As these lines
are flexible structures fixed to the sea bed and held taut by a buoy, sea
currents cause the lines to move and the storeys to rotate. The knowledge of
the position of the optical modules with a precision better than 10cm is
essential for a good reconstruction of particle tracks. In this paper the
ANTARES positioning system is described. It consists of an acoustic positioning
system, for distance triangulation, and a compass-tiltmeter system, for the
measurement of the orientation and inclination of the storeys. Necessary
corrections are discussed and the results of the detector alignment procedure
are described.
02/2012;
-
S. Adrián-Martínez,
J.A. Aguilar,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
A.C. Assis Jesus, [......],
M. Vecchi,
P. Vernin,
S. Wagner,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J.D. Zornoza,
J. Zúñiga
Astroparticle Physics 02/2012; · 3.22 Impact Factor
-
S. Adrián-Martínez,
J. A. Aguilar,
I. Al Samarai,
A Albert,
M André,
M Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
A. C. Assis Jesus, [......],
M. Vecchi,
P. Vernin,
S Wagner,
G. Wijnker,
J. Wilms,
E de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J Zúñiga
[show abstract]
[hide abstract]
ABSTRACT: The ANTARES detector, completed in 2008, is the largest neutrino telescope in
the Northern hemisphere. It is located at a depth of 2.5 km in the
Mediterranean Sea, 40 km off the Toulon shore. The scientific scope of the
experiment is very broad, being the search for astrophysical neutrinos the main
goal. In this paper we collect the 22 contributions of the ANTARES
collaboration to the 32nd International Cosmic Ray Conference (ICRC 2011). At
this stage of the experiment the scientific output is very rich and the
contributions included in these proceedings cover the main physics results
(steady point sources, correlations with GRBs, diffuse fluxes, target of
opportunity programs, dark matter, exotic physics, oscillations, etc.) and some
relevant detector studies (water optical properties, energy reconstruction,
moon shadow, accoustic detection, etc.)
12/2011;
-
H. van Haren,
I. Taupier-Letage,
J. A. Aguilar,
A Albert,
M Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
A. C. Assis Jesus,
T. Astraatmadja, [......],
B Vallage,
V. Van Elewyck,
M. Vecchi,
P. Vernin,
G. Wijnker,
E de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J Zúñiga
[show abstract]
[hide abstract]
ABSTRACT: An Acoustic Doppler Current Profiler (ADCP) was moored at the deep-sea site
of the ANTARES neutrino telescope near Toulon, France, thus providing a unique
opportunity to compare high-resolution acoustic and optical observations
between 70 and 170 m above the sea bed at 2475 m. The ADCP measured downward
vertical currents of magnitudes up to 0.03 m s-1 in late winter and early
spring 2006. In the same period, observations were made of enhanced levels of
acoustic reflection, interpreted as suspended particles including zooplankton,
by a factor of about 10 and of horizontal currents reaching 0.35 m s-1. These
observations coincided with high light levels detected by the telescope,
interpreted as increased bioluminescence. During winter 2006 deep dense-water
formation occurred in the Ligurian subbasin, thus providing a possible
explanation for these observations. However, the 10-20 days quasi-periodic
episodes of high levels of acoustic reflection, light and large vertical
currents continuing into the summer are not direct evidence of this process. It
is hypothesized that the main process allowing for suspended material to be
moved vertically later in the year is local advection, linked with topographic
boundary current instabilities along the rim of the 'Northern Current'.
11/2011;
-
S. Adrián-Martínez,
I. Al Samarai,
A Albert,
M André,
M Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
T. Astraatmadja,
J J Aubert, [......],
P. Vernin,
E. Visser,
S Wagner,
G. Wijnker,
J. Wilms,
E de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J Zúñiga
[show abstract]
[hide abstract]
ABSTRACT: The ANTARES telescope is well-suited to detect neutrinos produced in
astrophysical transient sources as it can observe a full hemisphere of the sky
at all times with a high duty cycle. Radio-loud active galactic nuclei with
jets pointing almost directly towards the observer, the so-called blazars, are
particularly attractive potential neutrino point sources. The all-sky monitor
LAT on board the Fermi satellite probes the variability of any given gamma-ray
bright blazar in the sky on time scales of hours to months. Assuming hadronic
models, a strong correlation between the gamma-ray and the neutrino fluxes is
expected. Selecting a narrow time window on the assumed neutrino production
period can significantly reduce the background.
An unbinned method based on the minimization of a likelihood ratio was
applied to a subsample of data collected in 2008 (61 days live time). By
searching for neutrinos during the high state periods of the AGN light curve,
the sensitivity to these sources was improved by about a factor of two with
respect to a standard time-integrated point source search. First results on the
search for neutrinos associated with ten bright and variable Fermi sources are
presented.
11/2011;
-
S. Adrián-Martínez,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
A. C. Assis Jesus,
T. Astraatmadja, [......],
M. Vecchi,
P. Vernin,
S. Wagner,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J. Zúñiga
[show abstract]
[hide abstract]
ABSTRACT: The group velocity of light has been measured at eight different wavelengths
between 385 nm and 532 nm in the Mediterranean Sea at a depth of about 2.2 km
with the ANTARES optical beacon systems. A parametrisation of the dependence of
the refractive index on wavelength based on the salinity, pressure and
temperature of the sea water at the ANTARES site is in good agreement with
these measurements.
10/2011;
-
ANTARES Collaboration,
S. Adrián-Martínez,
J. A. Aguilar,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid, [......],
M. Vecchi,
P. Vernin,
S. Wagner,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J. Zúñiga
[show abstract]
[hide abstract]
ABSTRACT: Magnetic monopoles are predicted in various unified gauge models and could be
produced at intermediate mass scales. Their detection in a neutrino telescope
is facilitated by the large amount of light emitted compared to that from
muons. This paper reports on a search for upgoing relativistic magnetic
monopoles with the ANTARES neutrino telescope using a data set of 116 days of
live time taken from December 2007 to December 2008. The one observed event is
consistent with the expected atmospheric neutrino and muon background, leading
to a 90% C.L. upper limit on the monopole flux between 1.3E-17 and 8.9E-17
cm-2.s-1.sr-1 for monopoles with velocity beta greater than 0.625.
10/2011;
-
Antares Collaboration,
S. Adrián-Martínez,
J. A. Aguilar,
I. Al Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid, [......],
M. Vecchi,
P. Vernin,
S. Wagner,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J. Zúñiga
[show abstract]
[hide abstract]
ABSTRACT: Results are presented of a search for cosmic sources of high energy neutrinos
with the ANTARES neutrino telescope. The data were collected during 2007 and
2008 using detector configurations containing between 5 and 12 detection lines.
The integrated live time of the analyzed data is 304 days. Muon tracks are
reconstructed using a likelihood-based algorithm. Studies of the detector
timing indicate a median angular resolution of 0.5 +/- 0.1 degrees. The
neutrino flux sensitivity is 7.5 x 10-8 ~ (E/GeV)^-2 GeV^-1 s^-1 cm^-2 for the
part of the sky that is always visible (declination < -48 degrees), which is
better than limits obtained by previous experiments. No cosmic neutrino sources
have been observed.
08/2011;
-
J. A. Aguilar,
I. Al. Samarai,
A. Albert,
M. André,
M. Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
A. C. Assis Jesus,
T. Astraatmadja, [......],
G. Vannoni,
M. Vecchi,
P. Vernin,
G. Wijnker,
J. Wilms,
E. de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J. Zúñiga
[show abstract]
[hide abstract]
ABSTRACT: The primary aim of ANTARES is neutrino astronomy with upward going muons
created in charged current muon neutrino interactions in the detector and its
surroundings. Downward going muons are background for neutrino searches. These
muons are the decay products of cosmic-ray collisions in the Earth's atmosphere
far above the detector. This paper presents a method to identify and count
electromagnetic showers induced along atmospheric muon tracks with the ANTARES
detector. The method is applied to both cosmic muon data and simulations and
its applicability to the reconstruction of muon event energies is demonstrated.
06/2011;
-
ANTARES Collaboration,
J. A. Aguilar,
I. Al Samarai,
A Albert,
M. Andre,
M Anghinolfi,
G. Anton,
S. Anvar,
M. Ardid,
A. C. Assis Jesus, [......],
V. Van Elewyck,
G. Vannoni,
M. Vecchi,
P. Vernin,
G. Wijnker,
E de Wolf,
H. Yepes,
D. Zaborov,
J. D. Zornoza,
J Zuniga
[show abstract]
[hide abstract]
ABSTRACT: An algorithm is presented, that provides a fast and robust reconstruction of
neutrino induced upward-going muons and a discrimination of these events from
downward-going atmospheric muon background in data collected by the ANTARES
neutrino telescope. The algorithm consists of a hit merging and hit selection
procedure followed by fitting steps for a track hypothesis and a point-like
light source. It is particularly well-suited for real time applications such as
online monitoring and fast triggering of optical follow-up observations for
multi-messenger studies. The performance of the algorithm is evaluated with
Monte Carlo simulations and various distributions are compared with that
obtained in ANTARES data.
05/2011;
