Quark beams

Michael, C; Webber, D.M.

doi:10.1088/0305-4616/6/3/001

Cited by 14 publications

(22 citation statements)

References 8 publications

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“…Neutrinos from the NuMI (Neutrinos from the Main Injector) beam [20] originate from decays of pions and kaons produced in the beamline target; a significantly smaller contribution arises from subsequent muon decays. The secondary mesons are created using 120 GeV protons extracted from the Fermilab Main Injector incident on a graphite target.…”

Section: Numi Beam and Minos Detectorsmentioning

confidence: 99%

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Search for sterile neutrino mixing in the MINOS long-baseline experiment

Adamson¹,

Andreopoulos²,

Auty³

et al. 2010

Phys. Rev. D

107

133

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A search for depletion of the combined flux of active neutrino species over a 735 km baseline is reported using neutral-current interaction data recorded by the MINOS detectors in the NuMI neutrino beam. Such a depletion is not expected according to conventional interpretations of neutrino oscillation data involving the three known neutrino flavors. A depletion would be a signature of oscillations or decay to postulated non-interacting "sterile" neutrinos, scenarios not ruled out by existing data. From an exposure of 3.18x10^{20} protons on target in which neutrinos of energies between ~500 MeV and 120 GeV are produced predominantly as nu_mu, the visible energy spectrum of candidate neutral-current reactions in the MINOS far detector is reconstructed. Comparison of this spectrum to that inferred from a similarly selected near detector sample shows that of the portion of the nu_mu flux observed to disappear in charged-current interaction data, the fraction that could be converting to a sterile state is less than 52% at 90% confidence level (C.L.). The hypothesis that active neutrinos mix with a single sterile neutrino via oscillations is tested by fitting the data to various models. In the particular four-neutrino models considered, the mixing angles theta_{24} and theta_{34} are constrained to be less than 11 degrees and 56 degrees at 90% C.L., respectively. The possibility that active neutrinos may decay to sterile neutrinos is also investigated. Pure neutrino decay without oscillations is ruled out at 5.4 standard deviations. For the scenario in which active neutrinos decay into sterile states concurrently with neutrino oscillations, a lower limit is established for the neutrino decay lifetime tau_3/m_3 > 2.1x10^{-12} s/eV at 90% C.L..Comment: 18 pages, 17 figures. Published in Phys. Rev.

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Section: Numi Beam and Minos Detectorsmentioning

confidence: 99%

“…For this analysis the neutrinos and antineutrinos are assumed to oscillate with the same parameters. The MINOS detectors are planar steel/scintillator tracking calorimeters [20]. The vertically oriented detector planes are composed of 2.54 cm thick steel and 1 cm thick plastic scintillator.…”

Section: Numi Beam and Minos Detectorsmentioning

confidence: 99%

Search for sterile neutrino mixing in the MINOS long-baseline experiment

Adamson¹,

Andreopoulos²,

Auty³

et al. 2010

Phys. Rev. D

107

133

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“…The former is chosen to be B 1=4 240 MeV as found in QCD sum rules [51,52] and also in another baglike analysis [59,60]. The latter is restricted to be at m g 1500 ÿ 1700 MeV as given by SU(3)-lattice results for the scalar glueball mass [61,62]. This leaves only g s and vac as free parameters and m g in the small range mentioned to find the minimum of " and we get parameter set PS-II in Table IV.…”

Section: A Cdm and Lattice Resultsmentioning

confidence: 99%

Two- and three-body color flux tubes in the chromodielectric model

et al. 2004

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Using the framework of the chromodielectric model we perform an analysis of color electric flux tubes in mesonlike q q and baryonlike qqq quark configurations. We discuss the Abelian color structure of the model and point out a symmetry in color space as a remnant of the SU(3) symmetry of QCD. The generic features of the model are discussed by varying the model parameters. We fix these parameters by reproducing the string tension 980 MeV=fm and the transverse width 0:35 fm of the q q flux tube obtained in lattice calculations. We use a bag constant B 1=4 240 ÿ 260 MeV, a glueball mass m g 1000 ÿ 1700 MeV, and a strong coupling constant C F s 0:2 ÿ 0:3. We show that the asymptotic string profile of an infinitely long flux tube is already reached for q q separations R 1:0 fm. A connection to the dual color superconductor is made by extracting a magnetic current from the model equations and a qualitative agreement between the two descriptions of confinement is shown. In the study of the qqq system we observe a -like geometry for the color electric fields and a Y-like geometry in the scalar fields both in the energy density distribution and in the corresponding potentials. The resulting total qqq potential is described neither by the -picture nor by the Y-picture alone.

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“…There have been two approaches in the intermediate volume calculation of SU(2) gauge theory: The Hamiltonian approach [1], which is a Rayleigh-Ritz analysis of an effective Hamiltonian. and the Lagrangian approach [2] [3] which is a Monte Carlo simulation of an effective Lagrangian. For a review of most of the work done in this area see [4].…”

Section: Introductionmentioning

confidence: 99%