Giles Barr: Publications

A measurement of the KS lifetime

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 537:1-2 (2002) 28-40

Authors:

A Lai, D Marras, JR Batley, A Bevan, RS Dosanjh, TJ Gershon, B Hay, GE Kalmus, C Lazzeroni, DJ Munday, MD Needham, E Olaiya, MA Parker, TO White, SA Wotton, G Barr, G Bocquet, A Ceccucci, T Cuhadar-Dönszelmann, D Cundy, G D'Agostini, N Doble, V Falaleev, W Funk, L Gatignon, A Gonidec, B Gorini, G Govi, P Grafström, W Kubischta, A Lacourt, M Lenti, S Luitz, JP Matheys, I Mikulec, A Norton, S Palestini, B Panzer-Steindel, D Schinzel, G Tatishvili, H Taureg, M Velasco, O Vossnack, H Wahl, C Cheshkov, A Gaponenko, P Hristov, V Kekelidze, D Madigojine, N Molokanova, Y Potrebenikov, A Tkatchev, A Zinchenko, I Knowles, V Martin, H Parsons, R Sacco, A Walker, M Contalbrigo, P Dalpiaz, J Duclos, PL Frabetti, A Gianoli, M Martini, F Petrucci, M Savrié, M Scarpa, A Bizzeti, M Calvetti, G Collazuol, G Graziani, E Iacopini, F Martelli, M Veltri, HG Becker, H Blümer, D Coward, M Eppard, H Fox, A Hirstius, K Holtz, A Kalter, K Kleinknecht, U Koch, L Köpke, P Lopesda Silva

Abstract:

A measurement of the KS lifetime is presented using data recorded by the NA48 experiment at the CERN-SPS during 1998 and 1999. The KS lifetime is derived from the ratio of decay time distributions in simultaneous, collinear KS and KL beams, giving a result which is approximately independent of the detector acceptance and with reduced systematic errors. The result obtained is τS = (0.89598 ± 0.00048 ± 0.00051) × 10-10 s, where the first error is statistical and the second systematic. © 2002 Published by Elsevier Science B.V.

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The trigger for K⁰ → π⁰π⁰ decays of the NA48 experiment at CERN

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 485:3 (2002) 676-697

Authors:

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

Abstract:

The trigger used for the collection of the samples of K0 → π0π0decays in the NA48 experiment at CERN uses a novel pipeline design in order to satisfy the demanding specifications of a high rate kaon beam. The trigger algorithms, architecture and performance are described. © 2002 Elsevier Science B.V. All rights reserved.

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Precise measurement of the decay KL → π0γγ

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 536:3-4 (2002) 229-240

Authors:

A Lai, D Marras, A Bevan, RS Dosanjh, TJ Gershon, B Hay, GE Kalmus, C Lazzeroni, DJ Munday, MD Needham, E Olaiya, MA Parker, TO White, SA Wotton, G Barr, G Bocquet, A Ceccucci, T Cuhadar-Dönszelmann, D Cundy, G D'Agostini, N Doble, V Falaleev, L Gatignon, A Gonidec, B Gorini, G Govi, P Grafström, W Kubischta, A Lacourt, M Lenti, S Luitz, I Mikulec, A Norton, S Palestini, B Panzer-Steindel, G Tatishvili, H Taureg, M Velasco, H Wahl, C Cheshkov, P Hristov, V Kekelidze, D Madigojine, N Molokanova, Y Potrebenikov, A Zinchenko, I Knowles, V Martin, R Sacco, A Walker, M Contalbrigo, P Dalpiaz, J Duclos, PL Frabetti, A Gianoli, M Martini

Abstract:

The decay rate of KL → π⁰ γγ has been measured with the NA48 detector at the CERN SPS. A total of 2558 KL π⁰γγ candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be (1.36 ± 0.03(stat) ± 0.03(syst) ± 0.03(norm)) × 10^-6 and the vector coupling constant av = -0.46 ± 0.03(stat) ± 0.04(syst). This result suggests that the CP-violation effects are dominating in the KL → π⁰e⁺e^- decay. An upper limit for the KL → π⁰γγ decay rate in the two photon mass region mγγ < mπ0 is also given. © 2002 Published by Elsevier Science B.V.

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New measurements of the η and K0 masses

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 533:3-4 (2002) 196-206

Authors:

A Lai, D Marras, JR Batley, AJ Bevan, RS Dosanjh, TJ Gershon, GE Kalmus, C Lazzeroni, DJ Munday, E Olaiya, MA Parker, TO White, SA Wotton, G Barr, G Bocquet, A Ceccucci, T Cuhadar-Dönszelmann, D Cundy, G D'Agostini, N Doble, V Falaleev, W Funk, L Gatignon, A Gonidec, B Gorini, G Govi, P Grafström, W Kubischta, A Lacourt, M Lenti, I Mikulec, A Norton, S Palestini, B Panzer-Steindel, D Schinzel, G Tatishvili, H Taureg, M Velasco, H Wahl, C Cheskov, P Hristov, V Kekelidze, D Madigojine, N Molokanova, Y Potrebenikov, A Zinchenko, VJ Martin, P Rubin, R Sacco, A Walker, D Bettoni, R Calabrese, M Contalbrigo, P Dalpiaz, J Duclos, PL Frabetti, A Gianoli, E Luppi, M Martini, L Masetti, F Petrucci, M Savrié, M Scarpa, A Bizzeti, M Calvetti, G Collazuol, G Graziani, E Iacopini, F Martelli, M Veltri, HG Becker, M Eppard, H Fox, A Hirstius, K Holtz, A Kalter, K Kleinknecht, U Koch, L Köpke, P Lopes da Silva, P Marouelli, I Mestvirishvili, I Pellmann, A Peters, SA Schmidt, V Schönharting, Y Schué, R Wanke, A Winhart, M Wittgen, JC Chollet, L Fayard, L Iconomidou-Fayard, J Ocariz, G Unal, I Wingerter-Seez, G Anzivino, P Cenci

Abstract:

New measurements of the η and K⁰ masses have been performed using decays to 3π⁰ with the NA48 detector at the CERN SPS. Using symmetric decays to reduce systematic effects, the results M(η) = 547.843 ± 0.051 MeV/c² and M(K⁰) = 497.625 ± 0.031 MeV/c² were obtained. © 2002 Elsevier Science B.V. All rights reserved.

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Precise measurement of the decay KL to pi0 gamma gamma

Physics Letters B 536 (2002) 229-240

Authors:

GD Barr, D. Schinzel, K. Kleinknecht, U. Koch

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Giles Barr

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A measurement of the KS lifetime

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The trigger for K⁰ → π⁰π⁰ decays of the NA48 experiment at CERN

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Precise measurement of the decay KL → π0γγ

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New measurements of the η and K0 masses

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Precise measurement of the decay KL to pi0 gamma gamma

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A measurement of the KS lifetime

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The trigger for K0 → π0π0 decays of the NA48 experiment at CERN

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Precise measurement of the decay KL → π0γγ

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New measurements of the η and K0 masses

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Precise measurement of the decay KL to pi0 gamma gamma

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The trigger for K⁰ → π⁰π⁰ decays of the NA48 experiment at CERN