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Journal articleAbreu P, Adam W, Adami F, et al., 1991,
A MEASUREMENT OF THE LIFETIME OF THE TAU-LEPTON
, PHYSICS LETTERS B, Vol: 267, Pages: 422-430, ISSN: 0370-2693- Author Web Link
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- Citations: 19
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Journal articleDAS I, SAMPATHKUMARAN EV, VIJAYARAGHAVAN R, 1991,
A PHASE-TRANSITION IN THE PSEUDOTERNARY SOLID-SOLUTIONS YCU2-XNIXSI2
, JOURNAL OF THE LESS-COMMON METALS, Vol: 171, Pages: L13-L15, ISSN: 0022-5088- Author Web Link
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- Citations: 5
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Journal articleApsimon R, Bacci C, Bauer G, et al., 1991,
Performance of a uranium/tetramethylpentane calorimeter backed by an iron/scintillator calorimeter
, Nuclear Inst and Methods in Physics Research A, Vol: 305, Pages: 331-343, ISSN: 0168-9002We present results from the barrel depleted uranium/TMP calorimeter modules constructed by the UA1 Collaboration. Electromagnetic and hadronic energy resolutions have been measured using electron and pion beams with momenta in the range 7 to 70 GeV/c. Results on the energy linearity and the spatial uniformity of response are reported. The electromagnetic shower position resolution has been measured as a function of energy using a fine grained position detector placed at a depth of - 3.5χ<inf>0</inf>. The noise arising both from the electronics chain and from the uranium radioactivity is compared with 70 GeV/c muon signals. The ratio of the electron to pion response has been measured both as a function of the energy and of the electric field. The high lateral and longitudinal granularity of the calorimeter and the presence of a position detector have been used to determine the electron pion separation as a function of energy. © 1991.
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Journal articleDAS I, SAMPATHKUMARAN EV, VIJAYARAGHAVAN R, 1991,
POSSIBLE EVIDENCE FOR AN ENERGY-GAP BELOW THE NEEL TEMPERATURE IN TERNARY RARE-EARTH COMPOUNDS
, PHYSICAL REVIEW B, Vol: 44, Pages: 159-162, ISSN: 0163-1829- Author Web Link
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- Citations: 27
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Journal articleALBAJAR C, Albrow MG, Allkofer OC, et al., 1991,
MEASUREMENT OF B0-BBAR0 MIXING AT THE CERN SPPBARS COLLIDER
, PHYSICS LETTERS B, Vol: 262, Pages: 171-178, ISSN: 0370-2693- Author Web Link
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- Citations: 26
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Journal articleALBAJAR C, Albrow MG, Allkofer OC, et al., 1991,
A SEARCH FOR RARE B-MESON DECAYS AT THE CERN SPPBARS COLLIDER
, PHYSICS LETTERS B, Vol: 262, Pages: 163-170, ISSN: 0370-2693- Author Web Link
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- Citations: 59
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Journal articleALBRECHT H, 1991,
SEARCH FOR B-]SX+X- IN EXCLUSIVE DECAYS OF B-MESONS
, PHYSICS LETTERS B, Vol: 262, Pages: 148-154, ISSN: 0370-2693- Cite
- Citations: 8
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Journal articleApsimon RJ, Atkinson M, Baake M, et al., 1991,
Separation of minimum and higher twist in photoproduction of high-PT mesons
, Zeitschrift Fur Physik C Particles and Fields, Vol: 50, Pages: 179-184, ISSN: 0170-9739Photo- and hadroproduction data in the beam energy range 65-175 GeV have been studied with a view to isolating higher-twist processes in photoproduction from other point-like and hadron-like contributions. With selection of charged tracks having p<inf>T</inf>>2 GeV/c and 0.28<x<inf>F</inf><0.84 indications of a higher twist contribution have been found at a level that is consistent with QCD expectations. © 1991 Springer-Verlag.
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Journal articleDAS I, SAMPATHKUMARAN EV, NAGARAJAN R, et al., 1991,
MAGNETIC AND ELECTRICAL-RESISTANCE BEHAVIOR OF THE COMPOUNDS RPT2GE2 (R = RARE-EARTH)
, PHYSICAL REVIEW B, Vol: 43, Pages: 13159-13163, ISSN: 0163-1829- Author Web Link
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- Citations: 12
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Journal articleSAMPATHKUMARAN EV, DAS I, VIJAYARAGHAVAN R, et al., 1991,
OBSERVATION OF HEAVY-FERMION LIKE BEHAVIOR AND ANOMALOUS MAGNETISM IN A PR-BASED METAL
, SOLID STATE COMMUNICATIONS, Vol: 78, Pages: 971-977, ISSN: 0038-1098- Author Web Link
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- Citations: 23
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Journal articleAlbrecht H, Ehrlichmann H, Hamacher T, et al., 1991,
Observation of the decay τ → ϱππντ
, Physics Letters B, Vol: 260, Pages: 259-264, ISSN: 0370-2693An analysis of the decay τ<sup>-</sup> → π<sup>-</sup>π<sup>-</sup>π<sup>+</sup>π<sup>0</sup>ν <inf>τ</inf> has been performed with the ARGUS detector at the DORIS II storage ring. From a study of the two pion subsystems we have found first evidence for the decays τ<sup>-</sup> → ρ{variant}<sup>0</sup>π<sup>-</sup>π<sup>0</sup>ν<inf>τ </inf>, τ<sup>-</sup> → ρ{variant}<sup> -</sup>π<sup>+</sup>π<sup>-</sup>ν<inf>τ</inf>, and τ<sup>-</sup> → ρ{variant}<sup>+</sup>π<sup>-</sup>π<sup>-</sup>ν<inf>τ </inf> with relative contributions to the decay τ<sup>-</sup> → π<sup>-</sup>π<sup>-</sup>π<sup>+</sup>π<sup>0</sup>ν <inf>τ</inf> of 0.30 ± 0.04, 0.26 ± 0.05, and 0.10 ± 0.03, respectively. The fraction of the subchannel τ<sup>-</sup> → ωπ<sup>-</sup>ν<inf>τ</inf> has been determined to be 0.33 ± 0.05. The production of ρ{variant} mesons is enhanced by a factor of 1.9 ± 0.3 over that of ω mesons. We conclude that in more than 81% (95% CL) of all τ<sup>-</sup> → π<sup>-</sup>π<sup>-</sup>π<sup>+</sup>π<sup>0</sup>ν <inf>τ</inf> decays either a ρ{variant} or ω meson is produced. © 1991.
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Journal articleAbreu P, Adam W, Adami F, et al., 1991,
A STUDY OF THE REACTION E+E--]MU+MU- AROUND THE Z0 POLE
, PHYSICS LETTERS B, Vol: 260, Pages: 240-248, ISSN: 0370-2693- Author Web Link
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- Citations: 6
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Journal articleALBAJAR C, Albrow MG, Allkofer OC, et al., 1991,
LIMITS ON T-QUARK DECAY INTO CHARGED HIGGS FROM A DIRECT SEARCH AT THE CERN PPBAR COLLIDER
, PHYSICS LETTERS B, Vol: 257, Pages: 459-468, ISSN: 0370-2693- Author Web Link
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- Citations: 12
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Journal articleBACCI C, BEZAGUET A, BLOESS D, et al., 1991,
PERFORMANCE OF A SEMI-OCTAGONAL-SHAPED URANIUM TETRAMETHYLPENTANE CALORIMETER
, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, Vol: 301, Pages: 445-450, ISSN: 0168-9002- Author Web Link
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- Citations: 3
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Journal articleAlvarez MP, Barate R, Bloch D, et al., 1991,
Branching ratios and properties of D-meson decays
, Zeitschrift Fur Physik C Particles and Fields, Vol: 50, Pages: 11-20, ISSN: 0170-9739Properties of D mesons produced in the photo-production experiment NA 14/2 at CERN are reported. The following ratios of branching fractions were measured: {Mathematical expression}. The D<sup>0</sup>→K<sup>-</sup>π<sup>+</sup>π<sup>+</sup>π<sup>-</sup> decay was analysed and the contribution of resonant subprocesses found consistent with 1 ρ<sup>0</sup> and 0.23 {Mathematical expression}<sup>*0</sup> per event. The angular distributions of D<sup>0</sup>→ {Mathematical expression}<sup>*0</sup> showed parity violation and destructive interference between S- and D-waves. From a Dalitz-plot analysis of the decay D<sup>+</sup>→K<sup>-</sup>π<sup>+</sup>π<sup>+</sup> the contribution from the quasi two-body decay D<sup>+</sup>→ {Mathematical expression}<sup>*0</sup>π<sup>+</sup> was measured to be 0.14±0.04±0.04. © 1991 Springer-Verlag.
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Journal articleALBAJAR C, ALBROW MG, ALLKOFER OC, et al., 1991,
J/PSI AND PSI' PRODUCTION AT THE CERN P-BARP COLLIDER
, PHYSICS LETTERS B, Vol: 256, Pages: 112-120, ISSN: 0370-2693- Author Web Link
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- Citations: 65
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Journal articleALBAJAR C, ALBROW MG, ALLKOFER OC, et al., 1991,
BEAUTY PRODUCTION AT THE CERN PP-BAR COLLIDER
, PHYSICS LETTERS B, Vol: 256, Pages: 121-128, ISSN: 0370-2693- Author Web Link
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- Citations: 120
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Journal articleAlbajar C, Albrow MG, Allkofer OC, et al., 1991,
J/ψ and ψ′ production at the CERN p̄p collider
, Physics Letters B, Vol: 256, Pages: 112-120, ISSN: 0370-2693We have measured the production cross-section times branching ratio for J/ψ→μ<sup>+</sup>μ<sup>-</sup> in pp̄ interactions at √s = 630 GeV in the kinematic range |y|<2.0 and p<inf>T</inf>>5 GeV/c, BR(J/ψ→μ<sup>+</sup>μ<sup>-</sup>)σ(p p ̄→J/ψ)=6.18±0.24±0.81 nb. The data sample collected in 1988 and 1989 for an integrated luminosity of 4.7 pb<sup>-1</sup> represents a fivefold improvement over the statistics in our earlier study of the J/ψ production process, and the p<inf>T</inf> distribution which is measured extends to 28 GeV/c. Using event topology we show that the rate for the direct production of J/ψ, via radiative decays of χ states, is larger than that for production via B-hadrons. Production of ψ′ is also studied using the decay modes <ψ′→μ<sup>+</sup>μ<sup>-</sup> and ψ′→J/ψπ<sup>+</sup>ψ<sup>-</sup>. © 1991.
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Journal articleAlvarez MP, Barate R, Bloch D, et al., 1991,
Results concerning the decay Ds ±→η′π±
, Physics Letters B, Vol: 255, Pages: 639-643, ISSN: 0370-2693A search for the decay D<inf>s</inf> <sup>+</sup>→η′π<sup>+</sup>;η′ →ρ{variant}γ has been performed by the NA14/2 photoproduction experiment at CERN. A signal compatible with the D<inf>s</inf> <sup>+</sup> has been observed, leading to a ratio of branching fractions of Br(D<inf>s</inf> <sup>+</sup>→η′π<sup>+</sup>) Br(D<inf>s<sup>+</sup>→φπ<sup>+</sup>)=2.5±1.0<inf>-0 .4</inf> <sup>+1.5</sup> </inf>. A value of Br(D<sup>+</sup>→η′π<sup>+</sup>) Br(D<sup>+</sup>→K<sup>-</sup>π<sup>+</sup>π<sup>+</sup>)< 0.1 is set at 90% CL. © 1991.
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Journal articleALBRECHT H, 1991,
OBSERVATION OF THE DECAYS DS--]PHI-E-NU-BAR AND D--]K-STAR0E-NU-BAR
, PHYSICS LETTERS B, Vol: 255, Pages: 634-638, ISSN: 0370-2693- Cite
- Citations: 33
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Journal articleDAS I, SAMPATHKUMARAN EV, VIJAYARAGHAVAN R, et al., 1991,
MAGNETIC AND SUPERCONDUCTING BEHAVIOR OF THE OXIDES, PR1-XGDXBA2CU3OY
, PHYSICA C, Vol: 173, Pages: 331-336, ISSN: 0921-4534- Author Web Link
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- Citations: 34
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Journal articleAbreu P, Adam W, Adami F, et al., 1991,
EXPERIMENTAL-STUDY OF THE TRIPLE-GLUON VERTEX
, PHYSICS LETTERS B, Vol: 255, Pages: 466-476, ISSN: 0370-2693- Author Web Link
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- Citations: 48
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Journal articleALBRECHT H, 1991,
RECONSTRUCTION OF SEMILEPTONIC B-]U DECAYS
, PHYSICS LETTERS B, Vol: 255, Pages: 297-304, ISSN: 0370-2693- Cite
- Citations: 81
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Journal articleSARMA DD, SEN P, CIMINO R, et al., 1991,
ORIGIN OF NONMETALLICITY IN PRBA2CU3O7 FROM A STUDY OF GD1-XPRXBA2CU3O7 USING SOFT-X-RAY ABSORPTION AT THE OXYGEN K-EDGE
, SOLID STATE COMMUNICATIONS, Vol: 77, Pages: 377-379, ISSN: 0038-1098- Author Web Link
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- Citations: 31
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Journal articleLABARGA L, ADOLPHSEN C, GRATTA G, et al., 1991,
THE MARK-II SILICON STRIP VERTEX DETECTOR AND PERFORMANCE OF A SILICON DETECTOR TELESCOPE IN THE MARK-II DETECTOR AT THE SLC
, IEEE TRANSACTIONS ON NUCLEAR SCIENCE, Vol: 38, Pages: 25-29, ISSN: 0018-9499- Author Web Link
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- Citations: 1
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Journal articleALBRECHT H, 1991,
SEARCH FOR B-]S GLUON IN B-MESON DECAYS
, PHYSICS LETTERS B, Vol: 254, Pages: 288-292, ISSN: 0370-2693- Cite
- Citations: 46
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Journal articleAlbajar C, Albrow MG, Allkofer OC, et al., 1991,
Measurement of the ratio R≡σWBr(W→μν)/σzBr (Z→μμ) and ΓWtot at the CERN proton-antiproton collider
, Physics Letters B, Vol: 253, Pages: 503-510, ISSN: 0370-2693An analysis of W and Z boson production at UA1, using 4.66 pb<sup>-1</sup> of data from the 1988 and 1989 CERN pp Collider runs at s=0.63 TeV, yields R≡σ<inf>W</inf>Br(W→μv)/σ<inf>z</inf>Br (Z→μμ)=10.4<inf>-1.5</inf><sup>+1.8</sup>stat.± 0.8(syst.) We find R=9.5<inf>-1.0</inf><sup>+1.1</sup>(stat.+syst.) when combining all available UA1 data, in both the electron and muon channel, taken in the period 1983-1989. In the framework of the standard model, the value of R is used to infer the total width of the W boson, Γ<inf>W</inf><sup>tot</sup>=2.18<inf>-0.24</inf><sup>+0.26</sup> (exp.)±0.04(theory) GeV/c<sup>2</sup>. © 1991.
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Journal articleAlbajar C, Albrow MG, Allkofer OC, et al., 1991,
MEASUREMENT OF THE RATIO R=SIGMA-WBR(W-]MU-UPSILON) SIGMA-ZETA-BR(ZETA-]MU-MU) AND GAMMA-WTOT AT THE CERN PROTON ANTIPROTON COLLIDER
, PHYSICS LETTERS B, Vol: 253, Pages: 503-510, ISSN: 0370-2693- Author Web Link
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- Citations: 47
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Journal articleLEADER E, 1991,
ARE GLUONS THE WHOLE STORY
, PHYSICS LETTERS B, Vol: 253, Pages: 457-458, ISSN: 0370-2693- Author Web Link
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- Citations: 6
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Journal articleAlbrecht H, Ehrlichmann H, Gläser R, et al., 1991,
Observation of spin-parity 2+ dominance in the reaction γγ→ρ0ρ0 near threshold
, Zeitschrift Fur Physik C Particles and Fields, Vol: 50, Pages: 1-10, ISSN: 0170-9739The reaction γγ→π<sup>+</sup>π<sup>-</sup>π<sup>+</sup>π<sup>-</sup> has been studied with the ARGUS detector. The rate in the invariant mass region below 1.8 GeV/c<sup>2</sup> is found to be largely due to ρ<sup>0</sup>ρ<sup>0</sup> production. A spin-parity analysis shows a dominance of the partial wave (J<sup>P</sup>, J<inf>z</inf>)=(2<sup>+</sup>, 2) with a small admixture from J<sup>P</sup>=0<sup>+</sup>. The contribution of negative parity states is consistent with zero. The large ratio of cross sections σ(γγ→ρ<sup>0</sup>ρ<sup>0</sup>)/σ(γγ→ρ<sup>+</sup>ρ<sup>-</sup>)≃4, and the dominance of the J<sup>P</sup>=2<sup>+</sup> wave in the reaction γγ→ρ<sup>0</sup>ρ<sup>0</sup> is a signature consistent with the production of an exotic (I=2) resonance. © 1991 Springer-Verlag.
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