-
K. Barth,
A. Belov,
B. Beltran,
H. Brauninger,
J. M. Carmona,
J. I. Collar,
T. Dafni,
M. Davenport, L. Di Lella,
C. Eleftheriadis, [......],
J. Ruz,
I. Savvidis,
Y. Semertzidis,
L. Stewart,
K. Van Bibber,
J. D. Vieira,
J. A. Villar,
J. K. Vogel,
L. Walckiers,
K. Zioutas
[show abstract]
[hide abstract]
ABSTRACT: In non-hadronic axion models, which have a tree-level axion-electron
interaction, the Sun produces a strong axion flux by bremsstrahlung, Compton
scattering, and axio-recombination, the "BCA processes." Based on a new
calculation of this flux, including for the first time axio-recombination, we
derive limits on the axion-electron Yukawa coupling g_ae and axion-photon
interaction strength g_ag using the CAST phase-I data (vacuum phase). For m_a <
10 meV/c2 we find g_ag x g_ae< 8.1 x 10^-23 GeV^-1 at 95% CL. We stress that a
next-generation axion helioscope such as the proposed IAXO could push this
sensitivity into a range beyond stellar energy-loss limits and test the
hypothesis that white-dwarf cooling is dominated by axion emission.
02/2013;
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CAST collaboration,
S. Andriamonje,
S. Aune,
D. Autiero,
K. Barth,
A. Belov,
B. Beltrán,
H. Bräuninger,
J.M. Carmona,
S. Cebrián, [......],
J. Ruz,
I. Savvidis,
Y. Semertzidis,
P. Serpico,
L. Stewart,
J. D. Vieira,
J. Villar,
J. Vogel,
L. Walckiers,
K. Zioutas
[show abstract]
[hide abstract]
ABSTRACT: We present the results of a search for a high-energy axion emission signal from 7Li (0.478 MeV) and D(p, γ)3He (5.5 MeV) nuclear transitions using a low-background γ-ray calorimeter during Phase I of the CAST experiment. These so-called ``hadronic axions'' could provide a solution to the long-standing strong-CP problem and can be emitted from the solar core from nuclear M1 transitions. This is the first such search for high-energy pseudoscalar bosons with couplings to nucleons conducted using a helioscope approach. No excess signal above background was found.
Journal of Cosmology and Astroparticle Physics 03/2010; 2010(03):032. · 5.72 Impact Factor
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CAST Collaboration: E. Arik,
S. Aune,
D. Autiero,
K. Barth,
A. Belov,
B. Beltrán,
S. Borghi,
F. S. Boydag,
H. Bräuninger,
G. Cantatore, [......],
P. Serpico,
S. K. Solanki,
R. Soufli,
L. Stewart,
M. Tsagri,
K van Bibber,
J5D. Villar,
J Vogel,
L Walckiers,
K. Zioutas
[show abstract]
[hide abstract]
ABSTRACT: The CAST (CERN Axion Solar Telescope) experiment is searching for solar axions by their conversion into photons inside the magnet pipe of an LHC dipole. The analysis of the data recorded during the first phase of the experiment with vacuum in the magnet pipes has resulted in the most restrictive experimental limit on the coupling constant of axions to photons. In the second phase, CAST is operating with a buffer gas inside the magnet pipes in order to extent the sensitivity of the experiment to higher axion masses. We will present the first results on the $^{4}{\rm He}$ data taking as well as the system upgrades that have been operated in the last year in order to adapt the experiment for the $^{3}{\rm He}$ data taking. Expected sensitivities on the coupling constant of axions to photons will be given for the recent $^{3}{\rm He}$ run just started in March 2008.
11/2008;
-
Giovanni Cantatore,
for the CAST Collaboration: E. Arik,
S. Aune,
D. Autiero,
K. Barth,
A. Belov,
B. Beltrán,
S. Borghi,
F. S. Boydag,
H. Bräuninger, [......],
P. Serpico,
S. K. Solanki,
R. Soufli,
L. Stewart,
M. Tsagri,
K van Bibber,
J. Villar,
J Vogel,
L Walckiers,
K. Zioutas
[show abstract]
[hide abstract]
ABSTRACT: We have started the development of a detector system, sensitive to single photons in the eV energy range, to be suitably coupled to one of the CAST magnet ports. This system should open to CAST a window on possible detection of low energy Axion Like Particles emitted by the sun. Preliminary tests have involved a cooled photomultiplier tube coupled to the CAST magnet via a Galileian telescope and a switched 40 m long optical fiber. This system has reached the limit background level of the detector alone in ideal conditions, and two solar tracking runs have been performed with it at CAST. Such a measurement has never been done before with an axion helioscope. We will present results from these runs and briefly discuss future detector developments.
10/2008;
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D. Autiero,
B. Beltran,
J. M. Carmona,
S. Cébrian,
E. Chesi,
M Davenport,
M Delattre, L Di Lella,
F Formenti,
I. G. Irastorza, [......],
B. Lakić,
G. Luzón,
J Morales,
L. Musa,
A. Ortiz,
A Placci,
A Rodriguez,
J. Ruz,
J. A. Villar,
K. Zioutas
[show abstract]
[hide abstract]
ABSTRACT: One of the three X-ray detectors of the CAST experiment searching for solar axions is a Time Projection Chamber (TPC) with a multi-wire proportional counter (MWPC) as a readout structure. Its design has been optimized to provide high sensitivity to the detection of the low intensity X-ray signal expected in the CAST experiment. A low hardware threshold of 0.8 keV is safely set during normal data taking periods, and the overall efficiency for the detection of photons coming from conversion of solar axions is 62 %. Shielding has been installed around the detector, lowering the background level to 4.10 x 10^-5 counts/cm^2/s/keV between 1 and 10 keV. During phase I of the CAST experiment the TPC has provided robust and stable operation, thus contributing with a competitive result to the overall CAST limit on axion-photon coupling and mass.
03/2007;
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CERN-Columbia-Oxford-Rockefeller (CCOR) Collaboration (A L S Angelis,
B J Blumenfeld,
L Camilleri,
T J Chapin,
R L Cool,
C del Papa, L Di Lella,
Z Dimcovski,
R J Hollebeek,
D Levinthal, [......],
S H Pordes,
A F Rothenberg,
A M Segar,
J Singh-Sidhu,
A M Smith,
M J Tannenbaum,
R A Vidal,
J Wallace-Hadrill,
T O White,
J M Yelton
[show abstract]
[hide abstract]
ABSTRACT: A large solid-angle apparatus consisting of a superconducting solenoid magnet, cylindrical drift chambers, and two arrays of lead-glass counters is used to examine particles associated with a high transverse momentum trigger in pp interactions at the CERN ISR. The trigger is given by energy deposition in the lead-glass arrays centred at 90°. Results on particle correlations and on jets are presented for interactions at √s = 62.4 GeV and in the trigger transverse momentum range 3 < pT < 11 GeV/c.
Physica Scripta 01/2007; 19(2):116. · 1.20 Impact Factor
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O. Samoylov,
D. Naumov,
V. Cavasinni,
P. Astier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
M. Banner,
G. Bassompierre,
K. Benslama, [......],
T. Vinogradova,
F.V. Weber,
T. Weisse,
F.F. Wilson,
L.J. Winton,
B.D. Yabsley,
H. Zaccone,
K. Zuber,
P. Zuccon,
The Nomad Collaboration
[show abstract]
[hide abstract]
ABSTRACT: A search for exotic Θ+ baryon via Θ+→p+K0
S decay mode in the NOMAD νμN data is reported. The special background generation procedure was developed. The proton identification criteria are tuned
to maximize the sensitivity to the Θ+ signal as a function of xF which allows to study the Θ+ production mechanism. We do not observe any evidence for the Θ+ state in the NOMAD data. We provide an upper limit on Θ+ production rate at 90% CL as 2.13×10-3 per neutrino interaction.
European Physical Journal C 12/2006; 49(2):499-510. · 3.63 Impact Factor
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K Zioutas,
S Andriamonje,
V Arsov,
S Aune,
D Autiero,
F T Avignone,
K Barth,
A Belov,
B Beltrán,
H Bräuninger, [......],
M L Sarsa,
I Savvidis,
W Serber,
P Serpico,
Y Semertzidis,
L Stewart,
J D Vieira,
J Villar,
L Walckiers,
K Zachariadou
[show abstract]
[hide abstract]
ABSTRACT: Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by the Primakoff process. In a laboratory magnetic field ("axion helioscope"), they would be transformed into x-rays with energies of a few keV. Using a decommissioned Large Hadron Collider test magnet, the CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from the analysis of these data are presented here. No signal above background was observed, implying an upper limit to the axion-photon coupling g(agamma)<1.16x10(-10) GeV-1 at 95% C.L. for m(a) less, similar 0.02 eV. This limit, assumption-free, is comparable to the limit from stellar energy-loss arguments and considerably more restrictive than any previous experiment over a broad range of axion masses.
Physical Review Letters 04/2005; 94(12):121301. · 7.37 Impact Factor
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P. Astier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
M Banner,
G Bassompierre,
K. Benslama,
N Besson,
I. Bird,
B Blumenfeld, [......],
H. Degaudenzi,
T Del Prete,
A. De Santo,
T Dignan, L Di Lella,
E do Couto e Silva,
J Dumarchez,
M. Ellis,
T Fazio,
R Ferrari
[show abstract]
[hide abstract]
ABSTRACT: A search was made among charged current events collected in the NOMAD experiment for the reaction: +N ! +D + hadrons ,! D A high purity D sample composed of 35 events was extracted. The D yield in charged current interactions was measured to be T = (0:79 Sigma 0:17(stat:) Sigma 0:10(syst:))%. The mean fraction of the hadronic jet energy taken by the D is 0:67 Sigma 0:02(stat) Sigma 0:02(syst:). The distributions of the fragmentation variables z, and x F for D are also presented.
02/2002;
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P. Astier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
M Banner,
G Bassompierre,
K. Benslama,
N Besson,
I. Bird,
B Blumenfeld, [......],
H. Degaudenzi,
T Del Prete,
A. De Santo,
T Dignan, L Di Lella,
E do Couto e Silva,
J Dumarchez,
M. Ellis,
T Fazio,
R Ferrari
[show abstract]
[hide abstract]
ABSTRACT: A study of strange particle production in charged current interactions has been performed using the data from the NOMAD experiment. Yields of neutral strange particles (K s , , ) have been measured. Mean multiplicities are reported as a function of the event kinematic variables E , W as well as of the variables describing particle behaviour within a hadronic jet: x F , z and p T . Decays of resonances and heavy hyperons with identified K s and in the final state have been analyzed. Clear signals corresponding to K have been observed.
01/2002;
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P. Astier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
M Banner,
G Bassompierre,
N Besson,
I. Bird,
B Blumenfeld,
F. Bobisut, [......],
T Del Prete,
A. De Santo,
T Dignan, L Di Lella,
E do Couto e Silva,
J Dumarchez,
M. Ellis,
T Fazio,
G J Feldman,
R Ferrari
[show abstract]
[hide abstract]
ABSTRACT: F.J.P. Soler h;t G. Sozzi D. Steele b;i U. Stiegler M. Stipcevi'c Th. Stolarczyk M. Tareb-Reyes G.N. Taylor V. Tereshchenko A. Toropin A.-M. Touchard S.N. Tovey h;k M.-T. Tran E. Tsesmelis J. Ulrichs L. Vacavant M. Valdata-Nappi d;1 V. Valuev f;j F. Vannucci K.E. Varvell M. Veltri V. Vercesi G. Vidal-Sitjes J.-M. Vieira T. Vinogradova F.V. Weber c;h T. Weisse F.F. Wilson L.J. Winton B.D. Yabsley H. Zaccone K. Zuber P. Zuccon LAPP, Annecy, France Johns Hopkins Univ., Baltimore, MD, USA Harvard Univ., Cambridge, MA, USA Univ. of Calabria and INFN, Cosenza, Italy Dortmund Univ., Dortmund, Germany JINR, Dubna, Russia Univ. of Florence and INFN, Florence, Italy CERN, Geneva, Switzerland University of Lausanne, Lausanne, Switzerland UCLA, Los Angeles, CA, USA University of Melbourne, Melbourne, Australia Inst. Nucl. Research, INR Moscow, Russia Univ. of Padova and INFN, Padova, Italy LPNHE, Univ. of P
05/2001;
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P. Astier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
M Banner,
G Bassompierre,
K. Benslama,
N Besson,
I. Bird,
B Blumenfeld, [......], L Di Lella,
E do Couto e Silva,
J Dumarchez,
M. Ellis,
T Fazio,
G J Feldman,
R Ferrari,
D. Ferr Ere,
V. Flaminio,
M Fraternali
[show abstract]
[hide abstract]
ABSTRACT: cevi c Th. Stolarczyk M. Tareb-Reyes G.N. Taylor V. Tereshchenko A. Toropin A.-M. Touchard S.N. Tovey M.-T. Tran E. Tsesmelis Preprint submitted to Elsevier Preprint 15 January 2001 J. Ulrichs L. Vacavant M. Valdata-Nappi d;1 V. Valuev f;j F. Vannucci K.E. Varvell M. Veltri V. Vercesi G. Vidal-Sitjes J.-M. Vieira T. Vinogradova F.V. Weber c;h T. Weisse F.F. Wilson L.J. Winton B.D. Yabsley H. Zaccone K. Zuber P. Zuccon LAPP, Annecy, France Johns Hopkins Univ., Baltimore, MD, USA Harvard Univ., Cambridge, MA, USA Univ. of Calabria and INFN, Cosenza, Italy Dortmund Univ., Dortmund, Germany JINR, Dubna, Russia Univ. of Florence and INFN, Florence, Italy CERN, Geneva, Switzerland University of Lausanne, Lausanne, Switzerland UCLA, Los Angeles, CA, USA University of Melbourne, Melbourne, Australia Inst. Nucl. Research, INR Moscow, Russia Univ. of Padova and INFN, Padova, Italy LPNHE, Univ. of Paris VI and VII
04/2001;
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P. Astier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
M Banner,
G Bassompierre,
K. Benslama,
N Besson,
I. Bird,
B Blumenfeld, [......],
J Dumarchez,
M. Ellis,
T Fazio,
G J Feldman,
R Ferrari,
D. Ferrere,
V. Flaminio,
M Fraternali,
J-M Gaillard,
E. Gangler
[show abstract]
[hide abstract]
ABSTRACT: We report on a search for heavy neutrinos (# 4 ) produced in the decay D s ## 4 at the SPS proton target followed by the decay # 4 e - in the NOMAD detector. Both decays are expected to occur if # 4 is a component of # # . From the analysis of the data collected during the 1996-1998 runs with 4.1 protons on target, a single candidate event consistent with background expectations was found. This allows to derive for the first time an upper limit on the mixing strength between the heavy neutrino and the tau neutrino in the # 4 mass range from 10 to 190 MeV. Windows between the SN1987a and Big Bang Nucleosynthesis lower limits and our result are still open for future experimental searches. The results obtained are used to constrain an interpretation of the time anomaly observed in the KARMEN1 detector.
04/2001;
-
P. Astier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
G. Ballocchi,
M Banner,
G Bassompierre,
K. Benslama,
N Besson,
I. Bird, [......],
J Dumarchez,
M. Ellis,
T Fazio,
G J Feldman,
R Ferrari,
V. Flaminio,
M Fraternali,
J-M Gaillard,
E. Gangler,
A Geiser
[show abstract]
[hide abstract]
ABSTRACT: This paper presents the results of an analysis of opposite sign dimuon events carried out by the NOMAD collaboration. The distributions of various kinematic variables are compared with a theoretical model of dimuon production, constructed within the framework of leading order QCD, to yield a determination of the charm quark mass, m c , the strange quark fraction of the nucleon sea, , and the average semileptonic branching ratio, B c . The paper is organised as follows : Section 2 outlines the theoretical description of opposite sign dimuon production within the framework of leading order QCD and Section 3 gives a brief description of the neutrino beam. The detector is described in Section 4 along with a description of the simulation programs used in the analysis (Section 4.2), a description of the data selection process and a discussion of the background determination. Section 5 presents details of the analysis and Section 6 contains a discussion and a comparison with the results of other experiments. Finally, Section 7 summarizes the results. 4 2 Theory In the Standard Model, an opposite sign dimuon event is produced when a neutrino interacts, via a charged current, with a strange (s) or down (d) quark, producing a charm (c) quark. The charm quark fragments into a charmed hadron (most frequently a D meson) which can then decay semileptonically resulting in a final state containing two oppositely charged muons : the primary
07/2000;
-
[show abstract]
[hide abstract]
ABSTRACT: We explore the physics potential of a terrestrial detector for observing axionic Kaluza-Klein excitations coming from the Sun within the context of higher-dimensional theories of low-scale quantum gravity. In these theories, the heavier Kaluza-Klein axions are relatively short-lived and may be detected by a coincidental triggering of their two-photon decay mode. Because of the expected high multiplicity of the solar axionic excitations, we find experimental sensitivity to a fundamental Peccei-Quinn axion mass up to $10^{-2}$ eV (corresponding to an effective axion-photon coupling $g_{a\gamma \gamma} \approx 2.\times 10^{-12}$ GeV$^{-1}$) in theories with 2 extra dimensions and a fundamental quantum-gravity scale $M_{\rm F}$ of order 100 TeV, and up to $3.\times 10^{-3}$ eV (corresponding to $g_{a\gamma \gamma} \approx 6.\times 10^{-13}$ GeV$^{-1}$) in theories with 3 extra dimensions and $M_{\rm F}=1$ TeV. For comparison, based on recent data obtained from lowest level underground experiments, we derive the experimental limits: $g_{a \gamma \gamma} \stackrel{<}{{}_\sim} 2.5\times 10^{-11}$ GeV$^{-1}$ and $g_{a \gamma \gamma} \stackrel{<}{{}_\sim} 1.2\times 10^{-11}$ GeV$^{-1}$ in the aforementioned theories with 2 and 3 large compact dimensions, respectively. Comment: 19 pages, extended version, as to appear in Physical Review D
06/2000;
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P. Astier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
G. Ballocchi,
M Banner,
G Bassompierre,
K. Benslama,
N Besson,
I. Bird, [......],
G J Feldman,
R Ferrari,
D. Ferrere,
V. Flaminio,
M Fraternali,
J-M Gaillard,
E. Gangler,
A Geiser,
D. Gibin,
S. Gninenko
[show abstract]
[hide abstract]
ABSTRACT: In the context of a two-flavour approximation we reinterpret the published NOMAD limit on # # # # oscillations in terms of # e # # # oscillations. At 90% C.L. we obtain sin 2 2# e# < 5.2 10 -2 for large #m 2 , while for sin 2 2# e# = 1 the confidence region includes #m 2 < 11 eV 2 /c 4 . Key words: neutrino oscillations 1 Introduction In a recent article [1], we have reported results from a search for # # # # oscillations using the NOMAD detector to look for # # appearance in the CERN wide-band neutrino beam. The detection of the potential oscillation signal relies on the identification of # # charged-current (CC) interactions using kinematic criteria. The analysis described in Ref. [1] was based on data collected in the 1995, 1996 and 1997 runs, corresponding to approximately 950 000 # CC events in the detector fiducial volume. No oscillation signal was observed. Since the beam contains a small but significant # e component, # # 's can in principle also be pro...
12/1999;
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J. Altegoer,
M. Anfreville,
C Angelini,
P. Astier,
M. Authier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
M Banner,
S. Basa, [......],
T Del Prete, L Di Lella,
T Dignan,
E do Couto e Silva,
I. Donnelly,
J Dumarchez,
C. Engster,
T Fazio,
G J Feldman,
R Ferrari
[show abstract]
[hide abstract]
ABSTRACT: NOMAD is a neutrino oscillation experiment designed to search for ø appearance in the CERN-SPS wide band predominantly ¯ beam. Signal detection is based on the identification of ø charged current interactions with the help of kinematic criteria. After the completion of the detector in August, 1995 the experiment has been successfully taking data till the end of 1996. The detector performances are in good agreement with our expectations. Preliminary analysis based on the 1995 data sample allows NOMAD to achieve the limit of 4 Theta 10 Gamma3 on sin 2 2` ¯ø for large Deltam 2 . NOMAD will continue to run during 1997. If no evidence for oscillations is found in all the NOMAD data the sensitivity to the oscillation parameters is expected to be improved by an order of magnitude with respect to the current limit. a Univ. of Massachusetts, Amherst, USA b LAPP, Annecy, France c Univ. of Calabria INFN, Cosenza, Italy d CERN, Geneva, Switzerland e Dortmund Univ., Dortmund, G...
09/1997;
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J. Altegoer,
M. Anfreville,
C Angelini,
P. Astier,
M. Authier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
M Banner,
S. Basa, [......],
T Del Prete, L Di Lella,
T Dignan,
E do Couto e Silva,
I. Donnelly,
J Dumarchez,
C. Engster,
T Fazio,
G J Feldman,
R Ferrari
[show abstract]
[hide abstract]
ABSTRACT: The NOMAD experiment has been optimized to detect primary electrons with good efficiency. e charged current interactions can be analysed to search for a ¯ ! e signal: no evidence for such a signal is observed in the NOMAD data collected during 1995 run. Comparing the ratio e = ¯ of observed e and ¯ charged current interactions to expectations shows no evidence for oscillations. A preliminary limit of sin 2 2` ! 1:8 Theta 10 Gamma3 can be set for high Deltam 2 . a Univ. of Massachusetts, Amherst, USA b LAPP, Annecy, France c Univ. of Calabria INFN, Cosenza, Italy d CERN, Geneva, Switzerland e Dortmund Univ., Dortmund, Germany f JINR, Dubna, Russia g Univ. of Florence INFN, Florence, Italy h Harvard Univ., Boston, USA i Johns Hopkins Univ., Baltimore, USA j University of Lausanne, Lausanne, Switzerland k UCLA, Los Angeles, USA l University of Melbourne, Melbourne, Australia m Inst. Nucl. Research, INR Moscow, Russia n Univ. of Padova INFN, Padov...
09/1997;
-
J. Altegoer,
M. Anfreville,
C Angelini,
P. Astier,
M. Authier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
M Banner,
S. Basa, [......],
T Del Prete, L Di Lella,
T Dignan,
E do Couto e Silva,
I. Donnelly,
J Dumarchez,
C. Engster,
T Fazio,
G J Feldman,
R Ferrari
[show abstract]
[hide abstract]
ABSTRACT: NOMAD is a short baseline neutrino oscillation experiment searching for ¯ ! ø and ¯ ! e oscillations in the CERN SPS wide band neutrino beam. The experiment has been collecting data since July 1995 and the data taking will continue until at least the end of 1997. A preliminary analysis based on the 1995 data sample allows NOMAD to set 90% confidence limits of sin 2 2` ¯ø ! 3:4 Theta 10 Gamma3 for ¯ ! ø and sin 2 2` ¯e ! 2 Theta 10 Gamma3 for ¯ ! e oscillations at large Deltam 2 . a Univ. of Massachusetts, Amherst, USA b LAPP, Annecy, France c Univ. of Calabria INFN, Cosenza, Italy d CERN, Geneva, Switzerland e Dortmund Univ., Dortmund, Germany f JINR, Dubna, Russia g Univ. of Florence INFN, Florence, Italy h Harvard Univ., Boston, USA i Johns Hopkins Univ., Baltimore, USA j University of Lausanne, Lausanne, Switzerland k UCLA, Los Angeles, USA l University of Melbourne, Melbourne, Australia m Inst. Nucl. Research, INR Moscow, Russia n ...
09/1997;
-
J. Altegoer,
C Angelini,
P. Astier,
D. Autiero,
A. Baldisseri,
M. Baldo-Ceolin,
G. Ballocchi,
M Banner,
S. Basa,
G Bassompierre, [......],
G Feldman,
R Ferrari,
D. Ferrere,
V. Flaminio,
M Fraternali,
J-M Gaillard,
P. Galumian,
E. Gangler,
A Geiser,
D. Gibin
[show abstract]
[hide abstract]
ABSTRACT: The NOMAD experiment is currently collecting data at the CERN SPS. The detector is now being completed, as specified in the original proposal, and has been further improved. All subdetectors are functioning well. The experiment is searching for ¯ ! ø neutrino oscillations and is sensitive to the mass difference squared Deltam 2 ? 0:7 eV 2 . Maximal sensitivity with respect to existing experimental limits is obtained for Deltam 2 ? 20 eV 2 where, if no oscillations events are seen, the excluded domain would improve by an order of magnitude. Preliminary measurements are presented from the 1994 and 1995 data samples. 1 Univ. of Massachusetts, Amherst, USA 2 LAPP, Annecy, France 3 Univ. of Calabria INFN, Cosenza, Italy 4 CERN, Geneva, Switzerland 5 Dortmund Univ., Dortmund, Germany 6 Dubna Univ., JINR, Russia 7 Univ. of Florence INFN, Florence, Italy 8 Harvard Univ., Boston, USA 9 Johns Hopkins Univ., Baltimore, USA 10 University of Lausanne, Lausanne, Switze...
09/1995;
