Giles Barr: Publications

Measurement of the Λc⁺ lifetime

Physical Review Letters 86:11 (2001) 2232-2236

Authors:

AH Mahmood, SE Csorna, I Danko, KW McLean, S Márka, Z Xu, R Godang, K Kinoshita, IC Lai, S Schrenk, G Bonvicini, D Cinabro, S McGee, LP Perera, GJ Zhou, E Lipeles, SP Pappas, M Schmidtler, A Shapiro, WM Sun, AJ Weinstein, F Würthwein, DE Jaffe, G Masek, HP Paar, EM Potter, S Prell, V Sharma, DM Asner, A Eppich, TS Hill, RJ Morrison, HN Nelson, RA Briere, GP Chen, BH Behrens, WT Ford, A Gritsan, J Roy, JG Smith, JP Alexander, R Baker, C Bebek, BE Berger, K Berkelman, F Blanc, V Boisvert, DG Cassel, M Dickson, PS Drell, KM Ecklund, R Ehrlich, AD Foland, P Gaidarev, RS Galik, L Gibbons, B Gittelman, SW Gray, DL Hartill, BK Heltsley, PI Hopman, CD Jones, J Kandaswamy, DL Kreinick, M Lohner, A Magerkurth, TO Meyer, NB Mistry, E Nordberg, JR Patterson, D Peterson, D Riley, JG Thayer, D Urner, B Valant-Spaight, A Warburton, P Avery, C Prescott, AI Rubiera, J Yelton, J Zheng, G Brandenburg, A Ershov, YS Gao, DYJ Kim, R Wilson, TE Browder, Y Li, JL Rodriguez, H Yamamoto, T Bergfeld, BI Eisenstein, J Ernst, GE Gladding, GD Gollin, RM Hans, E Johnson, I Karliner, MA Marsh, M Palmer

Abstract:

The lifetime of the lowest-mass charm bryon is measured to provide a window for the nonperturbative sector of heavy quark decay. The data are obtained in a colliding beam environment in the CLEO II.V detector at the Cornell Electron Storage Ring. In this environment, the event topologies and backgrounds are very different from those encountered in high energy fixed-target experiments.

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A precise measurement of the direct CP violation parameter Re(ε′/ε)

European Physical Journal C 22:2 (2001) 231-254

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Abstract:

The direct CP violation parameter Re(ε′/ε) has been measured from the decay rates of neutral kaons into two pions using the NA48 detector at the CERN SPS. With 3.3 million KL → π0π0 events collected during the 1998 and 1999 running periods, a result of Re(ε′/ε) = (15.0 ± 2.7) × 10-4 has been obtained. The result combined with the published 1997 sample is Re(ε′/ε) = (15.3 ± 2.6) × 10-4.

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A precise measurement of the direct CP violation parameter Re(ε′/ε)

EUROPEAN PHYSICAL JOURNAL C 22:2 (2001) 231-254

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, 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, PL da Silva, P Marouelli, I Pellmann, A Peters, SA Schmidt, V Schönharting, Y Schué, R Wanke, A Winhart, M Wittgen, JC Chollet, S Crépé, L Fayard, L Iconomidou-Fayard, J Ocariz, G Unal, I Wingerter-Seez, G Anzivino, P Cenci, E Imbergamo, P Lubrano, A Mestvirishvili, A Nappi, M Pepe, M Piccini, L Bertanza, P Calafiura, R Carosi, R Casali, C Cerri, M Cirilli, F Costantini, R Fantechi, S Giudici, I Mannelli, V Marzulli, G Pierazzini, M Sozzi, JB Cheze, J Cogan, M De Beer, P Debu, F Derue, A Formica, RG de Cassagnac, E Mazzucato, B Peyaud, R Turlay, B Vallage, I Augustin, M Bender, M Holder, A Maier, M Ziolkowski, R Arcidiacono, C Biino, N Cartiglia, R Guida, F Marchetto, E Menichetti, N Pastrone, J Nassalski, E Rondio, M Szlepor, W Wislicki, S Wronka, H Dibon, G Fischer, M Jeitler, M Markytan, G Neuhofer, M Pernicka, A Taurok, L Widhalm

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Search for the decay K_s → π⁰e⁺e^-

PHYSICS LETTERS B 514:3-4 (2001) 253-262

Authors:

A Lai, D Marras, R Batley, A Bevan, RS Dosanjh, TJ Gershon, GE Kalmus, B Hay, DJ Munday, E Olaiya, MA Parker, TO White, SA Wotton, G Barr, G Bocquet, A Ceccucci, T Cuhadar-Donszelmann, D Cundy, N Doble, V Falaleev, L Gatignon, A Gonidec, B Gorini, G Govi, P Grafström, W Kubischta, A Lacourt, M Lenti, A Norton, S Palestini, B Panzer-Steindel, G Tatishvili, H Taureg, M Velasco, H Wahl, C Cheshkov, A Gaponenko, P Hristov, V Kekelidze, D Madigojine, N Molokanova, Y Potrebenikov, A Tkatchev, A Zinchenko, L Knowles, C Lazzeroni, V Martin, R Sacco, A Walker, M Contalbrigo, P Dalpiaz, J Duclos, PL Frabetti, A Gianoli, M Martini, F Petrucci, M Savrié, A Bizzeti, M Calvetti, G Collazuol, G Graziani, E Iacopini, HG Becker, M Eppard, H Fox, K Holtz, A Kalter, K Kleinknecht, U Koch, L Köpke, PL da Silva, P Marouelli, I Pellmann, A Peters, B Renk, 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, E Imbergamo, P Lubrano, A Mestvirishvili, A Nappi, M Pepe, M Piccini, R Carosi, R Casali, C Cerri, M Cirilli, F Costantini, R Fantechi, S Giudici, I Mannelli, G Pierazzini, M Sozzi, JB Cheze, J Cogan, M De Beer, P Debu, A Formica, RG de Cassagnac, E Mazzucato, B Peyaud, R Turlay, B Vallage, M Holder, A Maier, M Ziolkowski, R Arcidiacono, C Biino, N Cartiglia, R Guida, F Marchetto, E Menichetti, N Pastrone, J Nassalski, E Rondio, M Szleper, W Wislicki, S Wronka, H Dibon, G Fischer, M Jeitler, M Markytan, I Mikulec, G Neuhofer, M Pernicka, A Taurok, L Widhalm

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Observation of the decay KS → π+π-e+e-

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 496:3-4 (2000) 137-144

Authors:

A Lai, D Marras, L Musa, A Bevan, RS Dosanjh, TJ Gershon, B Hay, GE Kalmus, DJ Munday, MD Needham, E Olaiya, MA Parker, TO White, SA Wotton, G Barr, H Blümer, G Bocquet, A Ceccucci, D Cundy, G D'Agostini, N Doble, V Falaleev, L Gatignon, A Gonidec, G Govi, P Grafström, W Kubischta, A Lacourt, A Norton, S Palestini, B Panzer-Steindel, B Peyaud, H Taureg, M Velasco, H Wahl, C Cheshkov, P Hristov, V Kekelidze, D Madigojine, A Mestvirishvili, N Molokanova, Y Potrebenikov, G Tatishvili, A Tkatchev, A Zinchenko, I Knowles, V Martin, H Parsons, R Sacco, C Lazzeroni, A Walker, M Contalbrigo, P Dalpiaz, J Duclos, PL Frabetti, A Gianoli, M Martini, F Petrucci, M Savrié, A Bizzeti, M Calvetti, G Collazuol, G Graziani, E Iacopini, M Lenti, HG Becker, M Eppard, H Fox, K Holtz, A Kalter, K Kleinknecht, U Koch, L Köpke, I Pellmann, A Peters, B Renk, SA Schmidt, V Schönharting, Y Schué, A Winhart, M Wittgen, JC Chollet, S Crépé, L Fayard, L Iconomidou-Fayard, J Ocariz, G Unal, I Wingerter-Seez, G Anzivino, P Cenci, E Imbergamo, P Lubrano, A Nappi, M Pepe, M Piccini, R Carosi, R Casali, C Cerri, M Cirilli, F Costantini

Abstract:

We present the first observation of the decay KS → π⁺π^-e⁺e^- based upon the data collected in 1998 by the NA48 experiment at CERN. We have identified a clean sample of 56 events with negligible background contamination. Using KL → π⁺π^-πD/⁰ decays as normalization sample, the branching ratio is measured to be BR(KS → π⁺π^-e⁺e^-) = [4,5 ± 0.7 (stat) ± 0.4(syst)] × 10^-5. This result is in good agreement with the theoretical expectations from the mechanism of inner bremsstrahlung. © 2000 Elsevier Science B.V.

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Giles Barr

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Measurement of the Λc⁺ lifetime

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A precise measurement of the direct CP violation parameter Re(ε′/ε)

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A precise measurement of the direct CP violation parameter Re(ε′/ε)

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Search for the decay K_s → π⁰e⁺e^-

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Observation of the decay KS → π+π-e+e-

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Measurement of the Λc+ lifetime

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A precise measurement of the direct CP violation parameter Re(ε′/ε)

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A precise measurement of the direct CP violation parameter Re(ε′/ε)

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Search for the decay Ks → π0e+e-

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Observation of the decay KS → π+π-e+e-

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Measurement of the Λc⁺ lifetime

Search for the decay K_s → π⁰e⁺e^-