Giles Barr: Publications

A 40 MHz pipelined trigger for K-0 -> 2 pi(0) decays for the CERN NA48 experiment

IEEE T NUCL SCI 45:4 (1998) 1771-1775

Authors:

B Gorini, C Avanzini, GD Barr, P Calafiura, M Cirilli, F Costantini, D Cundy, H Dibon, G Fischer, F Formenti, B Hallgren, W Iwanski, M Jeitler, P Kapusta, F Laico, G Laverriere, G Magazzu, M Markytan, I Mikulec, F Morsani, G Neuhofer, M Pernicka, GM Pierazzini, M Porcu, D Rizzi, F Rossi, M Sozzi, A Taurok, R Tripiccione, M Velasco, O Vossnack, H Wahl, M Ziolkowski

Abstract:

A first level trigger system based on a 40 MHz digital pipeline has been developed for the CERN NA48 [1] experiment, aiming at measuring CP violation in K-0 --> 2 pi decays.The outputs of the 13340 cells of the 10 m(3) liquid krypton calorimeter are summed into 64 X and 64 Y projection strips and continuously digitised with 40 MHz FADCs.This information is used to reconstruct at each clock cycle and for the two calorimeter projections, the number of clusters, the impact time of each of them (with a precision of about 3 ns), their total energy and the first and second moments of the energy distribution.Based on the quantities listed above, a programmable look-up table system subsequently computes online the longitudinal position of the kaon decay vertex and performs an event selection.The system is described.

Search for the proton decay mode p → ν K+ in Soudan 2

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 427:1-2 (1998) 217-224

Authors:

WWM Allison, GJ Alner, DS Ayres, G Barr, WL Barrett, C Bode, PM Border, CB Brooks, JH Cobb, R 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, J Schneps, MH Schub, R Seidlein, A Stassinakis, H Tom, JL Thron, V Vassiliev, G Villaume, S Wakeley, D Wall, N West, UM Wielgosz

Abstract:

We have searched for the proton decay mode p → ν K⁺ using the one-kiloton Soudan 2 high resolution calorimeter. Contained events obtained from a 3.56 kiloton-year fiducial exposure through June 1997 are examined for occurrence of a visible K⁺ track which decays at rest into μ⁺ ν or π⁺ π⁰. We found one candidate event consistent with background, yielding a limit, τ/B(p → ν K⁺) > 4.3 × 10³¹ years at 90% CL with no background subtraction. © 1998 Published by Elsevier Science B.V. All rights reserved.

Measurement of the decay KL → e+e-γγ

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 420:1-2 (1998) 205-210

Authors:

MG Setzu, A Nappi, A Beisser, T Beier, H Blümer, P Buchholz, D Coward, K Kleinknecht, F Leber, B Renk, H Rohrer, HG Sander, F Scheerer, J Scheidt, J Staeck, A Wagner, GD Barr, D Cundy, N Doble, L Gatignon, P Grafström, R Hagelberg, H Wahl, KJ Peach, E Augé, D Fournier, L Iconomidou-Fayard, O Perdereau, AC Schaffer, L Serin, L Bertanza, A Bigi, P Calafiura, M Calvetti, R Carosi, R Casali, R Fantechi, I Mannelli, VM Marzulli, GM Pierazzini, M Holder, A Kreutz, R Werthenbach

Abstract:

The full data set of the NA31 experiment at CERN has been used to analyse the decay mode K^OL → e⁺ e^-γγ. A signal of 47 events has been observed with an estimated background of 6.9 events. The total number of kaon decays in the decay volume was determined to be (2.1 ± 0.1stat) · 10⁹. This corresponds to a branching ratio of (8.0 ± 1.5^+1.4-1.2)· 10^-7. © 1998 Published by Elsevier Science B.V.

First measurement of the rate K0L → πμνγ

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 418:3-4 (1998) 411-418

Authors:

M Bender, I Augustin, M Holder, I Schwarze, M Ziolkowski, V Fanti, A Lai, L Musa, A Nappi, MG Setzu, RW Moore, DJ Munday, MA Parker, SF Takach, TO White, G Barr, G Bocquet, J Bremer, A Ceccucci, J Cogan, D Cundy, N Doble, G Fischer, W Funk, L Gatignon, A Gianoli, A Gonidec, P Grafstrom, W Kubischta, V Marzulli, G Kesseler, JP Matheys, A Norton, S Palestini, B Panzer-Steindel, D Schinzel, H Taureg, M Velasco, O Vossnack, V Kekelidze, I Kojevnikov, I Potrebenikov, G Tatichvili, A Tkatchev, L Bertolotto, O Boyle, B Hay, NE Mc Kay, G Oakland, H Parsons, KJ Peach, C Talamonti, A Walker, P Dalpiaz, J Duclos, A Formica, PL Frabetti, M Martini, F Petrucci, M Porcu, F Rossi, M Savrie, C Siman, A Bizzeti, M Calvetti, M Lenti, A Michetti, HG Becker, T Beier, H Blümer, P Buchholz, D Coward, C Ebersberger, A Kalter, K Kleinknecht, U Koch, L Köpke, F Leber, S Luitz, B Renk, J Scheidt, J Schmidt, V Schönharting, R Wilhelm, O Zeitnitz, JC Chollet, S Crépé, L Fayard, L Iconomidou-Fayard, J Ocariz, G Unal, G Anzivino, P Cenci, P Lubrano, M Pepe, P Calafiura, R Carosi, R Casali, C Cerri, F Costantini

Abstract:

In a preliminary version of the NA48 experiment at the CERN SPS, in which an iron-scintillator sandwich calorimeter was used as a photon detector, the ratio of KL → πμνγ and KL → πμν decays was measured. The branching ratio BR(KL → πμνγ,E*γ ≥30 MeV)/(KL → πμν) is found to be (2.08 ± 0.17^+0.16-0.21) × 10^-3, where the first error is statistical and the second systematic. The result is in agreement with theoretical predictions. © 1998 Elsevier Science B.V.

First measurement of the rate K-L(0)->pi mu nu gamma

418 (1998) 411-418

Authors:

M Bender, I Augustin, M Holder, I Schwarze, M Ziolkowski, V Fanti, A Lai, L Musa, A Nappi, MG Setzu, RW Moore, DJ Munday, MA Parker, SF Takach, TO White, G Barr, G Bocquet, J Bremer, A Ceccucci, J Cogan, D Cundy, N Doble, G Fischer, W Funk, L Gatignon, A Gianoli, A Gonidec, P Grafstrom, W Kubischta, V Marzulli, G Kesseler, JP Matheys, A Norton, S Palestini, B Panzer-Steindel, D Schinzel, H Taureg, M Velasco, O Vossnack, V Kekelidze, I Kojevnikov, I Potrebenikov, G Tatichvili, A Tkatchev, L Bertolotto, O Boyle, B Hay, NE Mc Kay, G Oakland, H Parsons, KJ Peach, C Talamonti, A Walker, P Dalpiaz, J Duclos, A Formica, PL Frabetti, M Martini, F Petrucci, M Porcu, F Rossi, M Savrie, C Siman, A Bizzeti, M Calvetti, M Lenti, A Michetti, HG Becker, T Beier, H Blumer, P Buchholz, D Coward, C Ebersberger, A Kalter, K Kleinknecht, U Koch, L Kipke, F Leber, S Luitz, B Renk, J Scheidt, J Schmidt, V Schonharting, R Wilhelm, O Zeitnitz, JC Chollet, S Crepe, L Fayard, L Iconomidou-Fayard, J Ocariz, G Unal, G Anzivino, P Cenci, P Lubrano, M Pepe, P Calafiura, R Carosi, R Casali, C Cerri, F Costantini

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Giles Barr

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A 40 MHz pipelined trigger for K-0 -> 2 pi(0) decays for the CERN NA48 experiment

Authors:

Abstract:

Search for the proton decay mode p → ν K+ in Soudan 2

Authors:

Abstract:

Measurement of the decay KL → e+e-γγ

Authors:

Abstract:

First measurement of the rate K0L → πμνγ

Authors:

Abstract:

First measurement of the rate K-L(0)->pi mu nu gamma

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Giles Barr

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A 40 MHz pipelined trigger for K-0 -> 2 pi(0) decays for the CERN NA48 experiment

Authors:

Abstract:

Search for the proton decay mode p → ν K+ in Soudan 2

Authors:

Abstract:

Measurement of the decay KL → e+e-γγ

Authors:

Abstract:

First measurement of the rate K0L → πμνγ

Authors:

Abstract:

First measurement of the rate K-L(0)->pi mu nu gamma

Authors:

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