Giles Barr: Publications

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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Search for CP violation in τ → Kπντ Decays

Physical Review Letters 88:11 (2002) 1118031-1118035

Authors:

G Bonvicini, D Cinabro, M Dubrovin, S McGee, A Bornheim, E Lipeles, SP Pappas, A Shapiro, WM Sun, AJ Weinstein, G Masek, HP Paar, R Mahapatra, RJ Morrison, RA Briere, GP Chen, T Ferguson, G Tatishvili, H Vogel, NE Adam, JP Alexander, C Bebek, K Berkelman, F Blanc, V Boisvert, DG Cassel, PS Drell, JE Duboscq, KM Ecklund, R Ehrlich, L Gibbons, B Gittelman, SW Gray, DL Hartill, BK Heltsley, L Hsu, CD Jones, J Kandaswamy, DL Kreinick, A Magerkurth, H Mahlke-Krüger, TO Meyer, NB Mistry, E Nordberg, M Palmer, JR Patterson, D Peterson, J Pivarski, D Riley, AJ Sadoff, H Schwarthoff, MR Shepherd, JG Thayer, D Urner, B Valant-Spaight, G Viehhauser, A Warburton, M Weinberger, SB Athar, P Avery, C Prescott, H Stoeck, J Yelton, G Brandenburg, A Ershov, DYJJ Kim, R Wilson, K Benslama, BI Eisenstein, J Ernst, GD Gollin, RM Hans, I Karliner, N Lowrey, MA Marsh, C Plager, C Sedlack, M Selen, JJ Thaler, J Williams, KW Edwards, R Ammar, D Besson, X Zhao, S Anderson, VV Frolov, Y Kubota, SJ Lee, SZ Li, R Poling, A Smith, CJ Stepaniak, J Urheim, S Ahmed, MS Alam, L Jian, M Saleem, F Wappler, E Eckhart, KK Gan

Abstract:

The origin and source of CP violation in fundamental fermion interactions was discussed. The CP violation in Lepton decay was analyzed in the context of a model where the CP symmetry was broken. No evidence of violation was found in lepton decays into the final state. Limits on the imaginary part of the coupling constant were provided describing a relative contribution of the CP violating processes with respect to the standard model. Systematic errors were estimated in order to estimate the limits on CP violating parameter.

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

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 485:3 (2002) PII S0168-9002(01)02148-9

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

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Giles Barr

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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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Search for CP violation in τ → Kπντ Decays

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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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Abstract:

Precise measurement of the decay KL to pi0 gamma gamma

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Search for CP violation in τ → Kπντ Decays

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

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