Giles Barr: Publications

Space charge in ionization detectors and the NA48 electromagnetic calorimeter

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 421:1-2 (1999) 75-89

Authors:

S Palestini, GD Barr, C Biino, P Calafiura, A Ceccucci, C Cerri, JC Chollet, M Cirilli, J Cogan, F Costantini, S Crépé, D Cundy, R Fantechi, L Fayard, G Fischer, A Formica, PL Frabetti, W Funk, A Gianoli, S Giudici, A Gonidec, B Gorini, G Govi, L Iconomidou-Fayard, V Kekelidze, W Kubischta, S Luitz, I Mannelli, M Martini, I Mikulec, A Norton, J Ocariz, D Schinzel, M Sozzi, G Tatishvili, A Tkatchev, G Unal, M Velasco, O Vossnack, H Wahl

Abstract:

The subject of space charge due to positive ions slowly moving in parallel plate ionization chambers is considered. A model for the degradation of the detector response is developed, with particular emphasis on electromagnetic calorimeters .The topics discussed include: (a) the stationary; (b) the time dependent cases; (c) the limit of very large space charge; (d) the electric field dependence of the electron drift velocity; (e) the effect of longitudinal development of showers; (f ) the behaviour of the average reductions of response; and (g) the non-uniformity of response for different positions of the shower axis inside the cell defined by the electrodes. The NA48 calorimeter is used as application and for comparison of results. © 1999 Elsevier Science B.V. All rights reserved.

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Direct search for light gluinos

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 446:2 (1999) 117-124

Authors:

V Fanti, A Lai, L Musa, D Marras, A Nappi, B Hay, RW Moore, KN Moore, DJ Munday, MD Needham, MA Parker, TO White, SA Wotton, J Andersen, G Barr, G Bocquet, J Bremer, A Ceccucci, D Cundy, N Doble, G Fischer, W Funk, L Gatignon, A Gianoli, A Gonidec, G Govi, P Grafström, W Kubischta, S Luitz, G Kesseler, JP Matheys, A Norton, S Palestini, B Panzer-Steindel, D Schinzel, H Taureg, M Velasco, O Vossnack, H Wahl, G Wirrer, V Kekelidze, A Mestvirishvili, I Potrebenikov, G Tatichvili, A Tkatchev, A Zinchenko, O Boyle, VJ Martin, IG Knowles, HLC Parsons, P Dalpiaz, J Duclos, PL Frabetti, M Martini, F Petrucci, M Porcu, M Savrie, A Bizzeti, M Calvetti, G Graziani, E Iacopini, M Lenti, A Michetti, HG Becker, H Blümer, P Buchholz, D Coward, C Ebersberger, H Fox, A Kalter, K Kleinknecht, U Koch, L Köpke, B Renk, J Scheidt, J Schmidt, V Schönharting, I Schue, R Wilhelm, A Winharting, M Wittgen, JC Chollet, S Crépé, L Iconomidou-Fayard, L Fayard, J Ocariz, G Unal, D Vattolo, I Wingerter, G Anzivino, P Cenci, P Lubrano, M Pepe, B Gorini, P Calafiura, R Carosi, C Cerri, M Cirilli, F Costantini, R Fantechi

Abstract:

We present the results for a direct search for light gluinos through the appearance of η→3π0 with high transverse momentum in the vacuum tank of the NA48 experiment at CERN. We find one event within a lifetime range of 10-9-10-3 s and another one between 10-10-10-9 s. Both events are consistent with the expected background from neutrons in the beam, produced by 450 GeV protons impinging on the Be targets, which interact with the residual air in the tank. From these data we give limits on the production of the hypothetical gg̃ bound state, the R0 hadron, and its R0→ηγ + ̃ decay in the R0 mass range between 1 and 5 GeV. © 1999 Elsevier Science B.V. All rights reserved.

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Measurement of the decay rate and form factor parameter αK* in the decay KL → e⁺e^-γ

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 458:4 (1999) 553-563

Authors:

V Fanti, A Lai, L Musa, D Marras, A Nappi, B Hay, RW Moore, KN Moore, DJ Munday, MD Needham, MA Parker, TO White, SA Wotton, G Barr, G Bocquet, J Bremer, A Ceccucci, D Cundy, N Doble, W Funk, L Gatignon, A Gianoli, A Gonidec, G Govi, P Grafström, W Kubischta, A Lacourt, S Luitz, G Kesseler, JP Matheys, A Norton, S Palestini, B Panzer-Steindel, D Schinzel, H Taureg, M Velasco, O Vossnack, H Wahl, G Wirrer, V Kekelidze, A Mestvirishvili, G Tatishvili, I Potrebenikov, A Tkatchev, A Zinchenko, O Boyle, VJ Martin, IG Knowles, HLC Parsons, P Dalpiaz, J Duclos, PL Frabetti, M Martini, F Petrucci, M Porcu, M Savrié, A Bizzeti, M Calvetti, G Collazuol, G Graziani, E Iacopini, M Lenti, A Michetti, HG Becker, H Blümer, P Buchholz, D Coward, C Ebersberger, H Fox, A Kalter, K Kleinknecht, U Koch, L Köpke, B Renk, J Scheidt, J Schmidt, V Schönharting, Y Schué, R Wilhelm, A Winhart, M Wittgen, JC Chollet, S Crépé, L Iconomidou-Fayard, L Fayard, J Ocariz, G Unal, D Vattolo, I Wingerter, G Anzivino, P Cenci, P Lubrano, M Pepe, B Gorini, P Calafiura, R Carosi, C Cerri, M Cirilli, F Costantini, R Fantechi

Abstract:

The decay rate of the neutral K meson KL → e+e-γ has been measured with the NA48 detector at the CERN SPS. A total of 6864 events has been observed with an estimated background of 10 events. The branching ratio is Γ(KL → e+e-γ)/Γ(KL → all) = (1.06 ± 0.02stat ± 0.02sys ± 0.04calc) × 10-5 The parameter αK* describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be αK* = -0.36 ± 0.06stat ± 0.02sys. © 1999 Published by Elsevier Science B.V. All rights reserved.

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The NA48 LKr calorimeter readout electronics

Institute of Electrical and Electronics Engineers (IEEE) (1999) 110-115

Authors:

A Gianoli, F Bal, G Barr, P Brodier-Youstone, P Buchholz, A Ceccucci, C Cerri, A Chlopik, F Costantini, R Fantechi, E Formenti, W Funk, S Giudici, B Gorini, Z Guzik, B Hallgren, Y Kozhevnikov, W Iwansky, C de la Taille, A Lacourt, G Laverriere, C Ljuslin, L Mannelli, G Martin-Chassa, M Martini, A Papi, N Seguin-Moseau, M Sozzi, JC Tarle, M Velasco, O Vossnack, H Wahl, M Ziolkowsky

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The atmospheric neutrino flavor ratio from a 3.9 fiducial kiloton-year exposure of Soudan 2

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 449:1-2 (1999) 137-144

Authors:

WWM Allison, GJ Alner, DS Ayres, G Barr, WL Barrett, C Bode, PM Border, CB Brooks, JH Cobb, RJ Cotton, H Courant, DM Demuth, TH Fields, HR Gallagher, C Garcia-Garcia, MC Goodman, R Gran, T Joffe-Minor, T Kafka, SMS Kasahara, W Leeson, PJ Litchfield, NP Longley, WA Mann, ML Marshak, RH Milburn, WH Miller, L Mualem, A Napier, WP Oliver, GF Pearce, EA Peterson, DA Petyt, LE Price, K Ruddick, M Sanchez, J Schneps, MH Schub, R Seidlein, A Stassinakis, JL Thron, V Vassiliev, G Villaume, S Wakely, D Wall, N West, UM Wielgosz

Abstract:

We report a measurement of the atmospheric neutrino flavor ratio, R, using a sample of quasi-elastic neutrino interactions occurring in an iron medium. The flavor ratio (tracks/showers) of atmospheric neutrinos in a 3.9 fiducial kiloton-year exposure of Soudan 2 is 0.64 ± 0.11(stat.) ± 0.06(syst.) of that expected. Important aspects of our main analysis have been checked by carrying out two independent, alternative analyses; one is based upon automated scanning, the other uses a multivariate approach for background subtraction. Similar results are found by all three approaches. © 1999 Elsevier Science B.V. All rights reserved.

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Giles Barr

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Space charge in ionization detectors and the NA48 electromagnetic calorimeter

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Direct search for light gluinos

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Measurement of the decay rate and form factor parameter αK* in the decay KL → e⁺e^-γ

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The NA48 LKr calorimeter readout electronics

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The atmospheric neutrino flavor ratio from a 3.9 fiducial kiloton-year exposure of Soudan 2

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Space charge in ionization detectors and the NA48 electromagnetic calorimeter

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Abstract:

Direct search for light gluinos

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Measurement of the decay rate and form factor parameter αK* in the decay KL → e+e-γ

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The NA48 LKr calorimeter readout electronics

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The atmospheric neutrino flavor ratio from a 3.9 fiducial kiloton-year exposure of Soudan 2

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Abstract:

Measurement of the decay rate and form factor parameter αK* in the decay KL → e⁺e^-γ