共查询到20条相似文献,搜索用时 15 毫秒
1.
N.Yu. Agafonova M. Aglietta P. Antonioli G. Bari A. Bonardi V.V. Boyarkin G. Bruno W. Fulgione P. Galeotti M. Garbini P.L. Ghia P. Giusti E. Kemp V.V. Kuznetsov V.A. Kuznetsov A.S. Malguin H. Menghetti R. Persiani A. Pesci I.A. Pless A. Porta V.G. Ryasny O.G. Ryazhskaya O. Saavedra G. Sartorelli M. Selvi C. Vigorito L. Votano V.F. Yakushev G.T. Zatsepin A. Zichichi 《The European Physical Journal C - Particles and Fields》2007,52(4):849-855
The CERN Neutrino to Gran Sasso (CNGS) project aims to produce a high energy, wide band νμ beam at CERN and send it toward the INFN Gran Sasso National Laboratory (LNGS), 732 km away. Its main goal is the observation
of the ντ appearance, through neutrino flavour oscillation. The beam started its operation in August 2006 for about 12 days: a total
amount of 7.6×1017 protons were delivered to the target. The LVD detector, installed in hall A of the LNGS and mainly dedicated to the study
of supernova neutrinos, was fully operating during the whole CNGS running time. A total number of 569 events were detected
in coincidence with the beam spill time. This is in good agreement with the expected number of events from Monte Carlo simulations.
PACS 14.60.Pq; 29.27.Fh; 29.40.Mc; 95.55.Vj 相似文献
2.
C. Jollet 《Physics of Atomic Nuclei》2006,69(11):1872-1875
The aim of the OPERA experiment is to provide unambiguous evidence for the ν
μ ↔ ν
τ oscillation by looking at the appearance of ν
τ in a pure ν
μ beam. This oscillation will be sought in the region of the oscillation parameters indicated by the atmospheric neutrino results.
The experiment is part of the CNGS (CERN Neutrino beam to Gran Sasso) project. The ν
μ beam produced at CERN will be sent towards the Gran Sasso underground laboratory, where the OPERA detector is under construction.
The detector, the physics potential, and performance for neutrino oscillation studies including the subleading ν
μ ↔ ν
ε search are presented.
The text was submitted by the author in English. 相似文献
3.
A.E. Ball A. Braem L. Camilleri A. Catinaccio G. Chelkov F. Dydak A. Elagin P.K. Frandsen M. Gostkin A. Grant A. Guskov C. Joram Z. Krumshteyn H. Müller H. Postema M. Price T. Rovelli D. Schinzel J. Séguinot G. Valenti R. Voss J. Wotschack A. Zhemchugov 《The European Physical Journal C - Particles and Fields》2007,49(4):1117-1142
Today’s greatest challenge in accelerator-based neutrino physics is to measure the mixing angle θ13 which is known to be much smaller than the solar mixing angle θ12 and the atmospheric mixing angle θ23. A non-zero value of the angle θ13 is a prerequisite for observing CP violation in neutrino mixing. In this paper, we discuss a deep-sea neutrino experiment
with 1.5 Mt fiducial target mass in the Gulf of Taranto with the prime objective of measuring θ13. The detector is exposed to the CERN neutrino beam to Gran Sasso in off-axis geometry. Monochromatic muon neutrinos of ≈
800 MeV energy are the dominant beam component. Neutrinos are detected through quasi-elastic, charged-current reactions in
sea water; electrons and muons are detected in a large-surface, ring-imaging Cherenkov detector. The profile of the seabed
in the Gulf of Taranto allows for a moveable experiment at variable distances from CERN, starting at 1100 km. From the oscillatory
pattern of the disappearance of muon neutrinos, the experiment will measure sin2θ23 and especially Δm2
23 with high precision. The appearance of electron neutrinos will be observed with a sensitivity to P(νμ→νe) as small as 0.0035 (90% CL) and sin2θ13 as small as 0.0019 (90% CL; for a CP phase angle δ=0° and for normal neutrino mass hierarchy). 相似文献
4.
Yu. A. Gornushkin 《Physics of Particles and Nuclei》2011,42(4):553-557
The OPERA experiment at the underground Gran Sasso Laboratory (LNGS) has to perform the first detection of neutrino oscillations
in appearance mode through the direct observation of νμ → ντ. The apparatus consists of a lead/emulsion-film target complemented by electronic detectors. It is placed in the high-energy,
long-baseline CERN neutrino beam (CNGS) 730 km away from the neutrino source. Runs with CNGS neutrinos were successfully carried
out in 2008–2009 with the first candidate event νμ → gvτ recently detected. 相似文献
5.
M. Dracos 《Physics of Atomic Nuclei》2004,67(6):1092-1096
The OPERA (oscillation project with emulsion-tracking apparatus) experiment aims to observe an unambiguous νπ?ντ oscillation in the parameter region allowed by previous experiments. The OPERA detector will be installed in the underground Gran Sasso Laboratory, 732 km away from CERN, where the CNGS (CERN neutrino beam to Gran Sasso) νπ beam will be produced. The signature of the presence of ντ's in the νπ beam will be the detection of τ leptons produced by ντ interactions. Nuclear emulsions will be used for precise event reconstruction, while electronic detectors will be used for triggering. 相似文献
6.
P. Coloma A. Donini P. Migliozzi L. Scotto Lavina F. Terranova 《The European Physical Journal C - Particles and Fields》2011,71(6):1674
In this paper we consider a Beta Beam setup that tries to leverage at most existing European facilities: i.e. a setup that
takes advantage of facilities at CERN to boost high-Q ions (8Li and 8B) aiming at a far detector located at L=732 km in the Gran Sasso Underground Laboratory. The average neutrino energy for 8Li and 8B ions boosted at γ∼100 is in the range E
ν
∈[1,2] GeV, high enough to use a large iron detector of the MINOS type at the far site. We perform, then, a study of the neutrino
and antineutrino fluxes needed to measure a CP-violating phase δ in a significant part of the parameter space. In particular, for θ
13≥3°, if an antineutrino flux of 3×1019 useful 8Li decays per year is achievable, we find that δ can be measured in 60% of the parameter space with 3×1018 useful 8B decays per year. 相似文献
7.
A. Donini E. Fernandez-Martinez P. Migliozzi S. Rigolin L. Scotto Lavina M. Selvi T. Tabarelli de Fatis F. Terranova 《The European Physical Journal C - Particles and Fields》2008,53(4):599-606
High density magnetized detectors are well suited to exploit the outstanding purity and intensities of novel neutrino sources
like neutrino factories and beta beams. They can also provide independent measurements of leptonic mixing parameters through
the observation of atmospheric muon-neutrinos. In this paper, we discuss the combination of these observables from a multi-kT
iron detector and a high energy beta beam; in particular, we demonstrate that even with moderate detector granularities the
neutrino mass hierarchy can be determined for θ13 values greater than 4°.
PACS 14.60.Pq; 14.60.Lm 相似文献
8.
V. I. Galkin Yu. A. Garnushkin V. A. Matveev A. G. Olshevsky N. G. Polukhina T. M. Roganova O. G. Ryazhskaya V. A. Tsarev 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(4):579-581
The main purpose of the OPERA experiment is the direct observation of neutrino oscillations (vμ → vτ) in the vμ beam from the CERN accelerator through the direct detection of τ leptons in nuclear emulsions at the Gran Sasso National Underground Laboratory. Some aspects of the use of the Russian PAVICOM facility for processing and analyzing the data obtained from the OPERA experiment are discussed. 相似文献
9.
A. Donini D. Meloni S. Rigolin 《The European Physical Journal C - Particles and Fields》2006,45(1):73-95
We present in this paper the analysis of the measurement of the unknown PMNS parameters θ13 and δ at future LBL facilities performing complete three parameters fits, each time fully including in the fit one of the
atmospheric and solar oscillation parameters within its present (future) error. We show that, due to the presence of degeneracies,
present uncertainties on θ23 and
worsen significantly the precision on (θ13,δ) at future LBL experiments. Only if a precision on the atmospheric parameters at least similar to what expected at T2K-I
is reached, then the sensitivities to θ13 and δ that have been presented in the literature for many facilities (where θ23 and
are generally considered as fixed external inputs) can indeed be almost recovered. On the other hand, the impact on this
measurement of the uncertainties on the solar parameters, θ12 and
is already negligible. Our analysis has been performed using three reference setups: the SPL Super-Beam and the standard
low-γ β-Beam, both aiming toward a Mton Water Čerenkov detector located at L = 130 km; the 50 GeV Neutrino Factory with a 40 kton Magnetized Iron Detector to look for the "golden channel" νe → νμ with baseline L = 3000 km and a 4 kton Emulsion Cloud Chamber to look for the "silver channel" νe → ντ with baseline L = 732 km.
Received: 19 July 2005, Revised: 30 September 2005, Published online: 11 November 2005
PACS:
14.60.Pq, 14.60.Lm 相似文献
10.
B. A. Popov 《Physics of Atomic Nuclei》2004,67(11):1942-1947
The results of the search for ν
μ
→ν
e
oscillations in the NOMAD experiment at CERN are presented. The experiment looked for the appearance of ν
e
in a predominantly ν
μ
wideband neutrino beam at the CERN SPS. No evidence for oscillations was found. The 90% confidence limits obtained are Δm
2<0.4 eV2 for maximal mixing and sin2(2θ)<1.4×10−3 for large Δm
2. This result excludes the LSND allowed region of oscillation parameters with Δm
2≳10 eV2.
From Yadernaya Fizika, Vol. 67, No. 11, 2004, pp. 1967–1972.
Original English Text Copyright ? 2004 by Popov.
This article was submitted by the author in English.
The author represents the NOMAD Collaboration 相似文献
11.
F. Terranova A. Marotta P. Migliozzi M. Spinetti 《The European Physical Journal C - Particles and Fields》2004,38(1):69-77
In this paper, the possibility to exploit a high energy beta beam without massive detectors is discussed. The radioactive ions are boosted up to very high
with the neutrino beam pointing towards an instrumented surface located at a moderate baseline (e.g. from CERN to the Gran Sasso Laboratories).
oscillations and their CP conjugate are tagged as an excess of horizontal muons produced in the rock and tracked by the low-mass instrumented surface installed in one of the LNGS experimental halls. We show that the performance of this complex for what concerns the determination of the
angle of the leptonic mixing matrix is comparable with the current low-
design based on a gigantic water Cherenkov at Frejus.Received: 13 September 2004, Published online: 9 November 2004PACS:
14.60.Pq, 14.60.Lm 相似文献
12.
K.S. Kim Myung Ki Cheoun Yeungun Chung Hyung Joo Nam 《The European Physical Journal A - Hadrons and Nuclei》2001,11(2):147-154
New results for the double beta decay of 76
Ge are presented. They are extracted from data obtained with the HEIDELBERG-MOSCOW experiment, which operates five enriched
76
Ge detectors in an extreme low-level environment in the Gran Sasso underground laboratory. The two-neutrino-accompanied double
beta decay is evaluated for the first time for all five detectors with a statistical significance of 47.7 kg y resulting in
a half-life of T
1/2
2ν = [1.55±0.01(stat)+0.19
-0.15(syst)]×1021 y. The lower limit on the half-life of the 0νββ decay obtained with pulse shape analysis is T
1/2
0ν > 1.9×1025(3.1×1025) y with 90% C.L. (68% C.L.) (with 35.5 kg y). This results in an upper limit of the effective Majorana-neutrino mass of 0.35
eV (0.27 eV) using the matrix elements of A. Staudt et al.'s work (Europhys. Lett. 13, 31 (1990)). This is the most stringent limit at present from double beta decay. No evidence for a majoron-emitting decay
mode is observed.
Received: 22 August 2001 / Accepted: 18 October 2001 相似文献
13.
We present an optimization of the hadron focusing system for a low-energy high intensity conventional neutrino beam (super-beam)
proposed on the basis of the HP-SPL at CERN with a beam power of 4 MW and an energy of 4.5 GeV. The far detector would be
a 440 kton Water Cherenkov detector (MEMPHYS) located at a baseline of 130 km in the Fréjus site. The neutrino fluxes simulation
relies on a new GEANT4 based simulation coupled with an optimization algorithm based on the maximization of the sensitivity
limit on the θ
13 mixing angle. A new configuration adopting a multiple horn system with solid targets is proposed which improves the sensitivity
to θ
13 and the CP violating phase δ
CP. 相似文献
14.
The Liquid Argon imaging technique, as proposed for the ICARUS detector, offers the possibility to perform complementary and simultaneous measurements of neutrinos, as those of CERN to Gran Sasso beam (CNGS) and those from cosmic ray events. For the currently allowed values of the Super—Kamiokande results, the combination of both CNGS and atmospheric data will provide a precise determination of the oscillation parameters. Since one can observe and unambiguously identify νe, νμ and ντ components, this technology allows to explore the full (3 x 3) mixing matrix. The same class of detector can be proposed for high precision measurements at a neutrino factory. 相似文献
15.
G. C. Nayak 《Physics of Particles and Nuclei Letters》2011,8(4):337-341
We study dark matter production at CERN LHC from black hole remnants (BHR). We find that the typical mass of these BHR at
the LHC is ∼5–10 TeV which is heavier than other dark matter candidates, such as axion, axino, neutralino, etc. We propose
the detection of this dark matter via single jet production in the process pp → jet + BHR (dark matter) at CERN LHC. We find that for zero impact parameter partonic collisions, the monojet cross section
is not negligible in comparison to the standard model background and is much higher than the other dark matter scenarios studied
so far. We also find that dσ/dp
T
of jet production in this process increases as p
T
increases, whereas in all other dark matter scenarios the dσ/dp
T
decreases at CERN LHC. This may provide a useful signature for dark matter detection at the LHC. However, we find that when
the impact parameter dependent effect of inelasticity is included, the monojet cross section from the above process becomes
much smaller than the standard model background and may not be detectable at the LHC. 相似文献
16.
An optimization of the CERN SPL beam line has been performed guided by the sensitivities to the Θ13 mixing angle and to the δCP Dirac CP violating phase. A UNO-like 440 ktons water Čerenkov detector located at 130 km from the target in a new foreseen
Fréjus laboratory has been used as a generic detector. Concerning the δCP independent Θ13 sensitivity, a gain of about 20% may be reached using a 3.5 GeV proton beam with a 40 m long, 2 m radius decay tunnel compared
to the up to now considered 2.2 GeV beam energy and 20 m long, 1 m radius decay tunnel. This may motivate new machine developments
to upgrade the nominal SPL proton beam energy. 相似文献
17.
S.-H. Zhu 《The European Physical Journal C - Particles and Fields》2006,47(3):833-837
In this paper, we study the observability of an invisible Higgs boson at Fermilab Tevatron and CERN LHC through the production
channel qq̄→ZH→ℓ+ℓ-+P/T, where/PT is reconstructed from the ℓ+ℓ- with ℓ=e or μ. A new strategy is proposed to eliminate the largest irreducible background, namely qq̄→Z(→ℓ+ℓ-)Z(→νν̄). This strategy utilizes the precise measurements of qq̄→Z(→ℓ+ℓ-)Z(→ℓ+ℓ-). For mH=120 GeV and with luminosity 30 fb-1 at Tevatron, a 5σ observation of the invisible Higgs boson is possible. For mH=114∼140 GeV with only 10 fb-1 luminosity at LHC, a discovery signal over 5σ can be achieved.
PACS 14.80.Cp 相似文献
18.
P. Anselmann W. Hampel G. Heusser J. Kiko T. Kirsten E. Pernicka R. Plaga U. R?nn M. Sann C. Schlosser et al. 《Il Nuovo Cimento C》1992,15(6):917-929
Summary The GALLEX collaboration is performing an experiment for the detection of neutrinos coming principally from the p-p fusion
reaction in the Sun, via the reaction νe+71Ga→71Ge+e−. The experiment is running in the Gran Sasso Underground Laboratory of INFN, using as a target 30.3 tons of gallium in the
form of 8.13 molar aqueous GaCl3 solution.
A report is given of the status of GALLEX after the end of the operations devoted to the removal from the solution of the
cosmogenically formed Ge isotopes, completed in the middle of 1991. The experiment is now collecting data on solar neutrinos
and the data analysis is in progress. Preliminary results concerning the first year of measurement are presented.
Paper presented at the V Cosmic Physics National Conference, S. Miniato, November 27–30, 1990. 相似文献
19.
《Physics of Atomic Nuclei》2006,69(12):2083-2089
CUORICINO is an array of 62 TeO2 bolometers with a total mass of 40.7 kg (11.2 kg of 130Te), operated at about 10 mK to search for ββ(0ν) of 130Te. The detectors are organized as a 14-story tower and intended as a slightly modified version of one of the 19 towers of
the CUORE project, a proposed tightly packed array of 988 TeO2 bolometers (741 kg of total mass of TeO2) for ultralow-background searches on neutrinoless double-beta decay, cold dark matter, solar axions, and rare nuclear decays.
Started in April 2003 at the Laboratori Nazionali del Gran Sasso (LNGS), CUORICINO data taking was stopped in November 2003
to repair the readout wiring system of the 62 bolometers. Restarted in spring 2004, CUORICINO is presently the most sensitive
running experiment on neutrinoless double-beta decay. No evidence for ββ(0ν) decay has been found so far and a new lower limit, T
1
2/0ν
≥ 1.8 × 1024 yr (90% C.L.), is set, corresponding to 〈m
ν〉 ≤ 0.2–1.1 eV, depending on the theoretical nuclear matrix elements used in the analysis. Detector performance, operational
procedures, and background analysis results are reviewed. The expected performance and sensitivity of CUORE is also discussed.
CUORE Collaboration
The text was submitted by the authors in English. 相似文献
20.
Fei Wang Wenyu Wang Fuqiang Xu Jin Min Yang Huanjun Zhang 《The European Physical Journal C - Particles and Fields》2007,51(3):713-719
In split supersymmetry, gauginos and higgsinos are the only supersymmetric particles possibly accessible at foreseeable colliders
like the CERN Large Hadron Collider (LHC) and the International Linear Collider (ILC). In order to account for the cosmic
dark matter measured by WMAP, these gauginos and higgsinos are stringently constrained and could be explored at the colliders
through their direct productions and/or virtual effects in some processes. The clean environment and high luminosity of the
ILC render the virtual effects at percent level meaningful in unraveling the new physics effects. In this work we assume split
supersymmetry and calculate the virtual effects of the WMAP-allowed gauginos and higgsinos in the Higgs productions e+e-→Zh and e+e-→νeν̄eh through WW fusion at the ILC. We find that the production cross section of e+e-→Zh can be altered by a few percent in some part of the WMAP-allowed parameter space, while the correction to the WW fusion
process e+e-→νeν̄eh is below 1%. Such virtual effects are correlated with the cross sections of chargino pair productions and can offer complementary
information in probing split supersymmetry at the colliders.
PACS 14.80.Ly; 95.35.+d 相似文献