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1. A new measurement of the K±→π±γγ decay at the NA48/2 experiment

Author: Fabrizio Petrucci, B. Vallage, Lau Gatignon, Cristina Biino, G. Neuhofer, A. Winhart, M. Sozzi, L. DiLella, Massimiliano Fiorini, Leander Litov, S. Giudici, T. Fonseca Martin, E. Monnier, P. Cenci, D.C. Cundy, Nicola Cabibbo, C. Cheshkov, V. Kozhuharov, R. Fantechi, M. Veltri, A. I. Zinchenko, D.J. Munday, Milene Calvetti, W. Kubischta, M. Savrie, Marco Clemencic, Nicolo Cartiglia, M. Pepe, I. Polenkevich, B. Bloch-Devaux, N. Doble, M. D. Wood, Enrico Celeghini, Mauro Piccini, A. Ceccucci, I. Mannelli, A. Gianoli, P. Hristov, Evelina Gersabeck, G.E. Kalmus, M. Szleper, A. Peters, Andrea Bizzeti, M. De Beer, H. Dibon, Wander Baldini, Cristina Lazzeroni, F. Marchetto, A. Cotta Ramusino, A. Dabrowski, Ivan Mikulec, L. Widhalm, S. Goy Lopez, J.B. Cheze, J. Derre, M. C. Petrucci, Mauro Raggi, A. Norton, Roland Winston, C. Morales Morales, M. Behler, Roberta Arcidiacono, A. A. Maier, F. Costantini, G. Ruggiero, E. Imbergamo, Luca Fiorini, M. Ziolkowski, S. Stoynev, L. Masetti, Mayda Velasco, A. Gonidec, P. Rubin, C. Cerri, M. Wache, Vladimir Kekelidze, P. Marouelli, D. T. Madigozhin, U. Moosbrugger, G. Collazuol, M. Markytan, M. Lenti, E. Iacopini, H. D. Wahl, M. Fidecaro, G.M. Pierazzini, E. Mazzucato, B. Peyaud, P. F. Dalpiaz, M.W. Slater, G. Lamanna, M. Shieh, B. Renk, C. Damiani, J. R. Batley, M. Scarpa, G. Bocquet, Yu. Potrebenikov, Evgueni Goudzovski, S. Balev, M. Martini, Alan W. Walker, V. Falaleev, A. Nappi, Manfred Jeitler, G. Anzivino, N. A. Molokanova, K. Eppard, P. L. Frabetti, Konrad Kleinknecht, A. Michetti, M. Valdata-Nappi, M. Holder, S. Venditti, S. A. Wotton, Maulik R. Patel, Simone Bifani, Rainer Wanke, E. C. Swallow, D. Coward, and G. Marel
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle decay, Pion, Chiral perturbation theory, Meson, Branching fraction, Hadron, Analytical chemistry, Radioactive decay, Dimensionless quantity
Abstract: The NA48/2 experiment at CERN collected two data samples with minimum bias trigger conditions in 2003 and 2004. A measurement of the rate and dynamic properties of the rare decay K ± → π ± γ γ from these data sets based on 149 decay candidates with an estimated background of 15.5 ± 0.7 events is reported. The model-independent branching ratio in the kinematic range z = ( m γ γ / m K ) 2 > 0.2 is measured to be B MI ( z > 0.2 ) = ( 0.877 ± 0.089 ) × 10 − 6 , and the branching ratio in the full kinematic range assuming a particular Chiral Perturbation Theory description to be B ( K π γ γ ) = ( 0.910 ± 0.075 ) × 10 − 6 .
Published: 2014

2. Measurement of the branching ratio of the decay Ξ0→Σ+μ−ν¯μ

Author: Milene Calvetti, H. Dibon, G.M. Pierazzini, L. Gatignon, G. Ruggiero, A. Gonidec, Cristina Lazzeroni, P. F. Dalpiaz, M. De Beer, S. Giudici, G. Collazuol, T. Fonseca Martin, Mauro Piccini, E. Monnier, G. Bocquet, Yu. Potrebenikov, D.J. Munday, Nicolo Cartiglia, Manfred Jeitler, M. Scarpa, G. Neuhofer, D.C. Cundy, A. Winhart, Rainer Wanke, H. Wahl, Nadia Pastrone, R. Sacco, A. Hirstius, G. Anzivino, G. Gouge, Simone Bifani, M. Behler, Marco Clemencic, M. Pepe, P. Marouelli, B. Panzer-Steindel, M. Veltri, P. Debu, E. Iacopini, R. Winston, S. Wotton, A. Maier, N. Doble, Vladimir Kekelidze, P. Cenci, E. C. Swallow, N. A. Molokanova, P. Grafström, W. Baldini, K. Eppard, Cristina Biino, M. Ziolkowski, P. Rubin, P. Lubrano, M. Holder, A. Nappi, D. T. Madigozhin, A. Peters, Evgueni Goudzovski, F. Costantini, I. Mannelli, M. Sozzi, S. Stoynev, L. Widhalm, S. Goy Lopez, Roberta Arcidiacono, U. Koch, W. Wislicki, U. Moosbrugger, M. Martini, A. Norton, M. Patel, W. Kubischta, Konrad Kleinknecht, G. Marel, M.W. Slater, A. Zinchenko, L. Masetti, Ivan Mikulec, E. Menichetti, E. Mazzucato, P. Hristov, J. R. Batley, E. Imbergamo, B. Peyaud, C. Cheshkov, V. Kozhuharov, M. Eppard, V. Falaleev, M. Savrie, F. Marchetto, A. Michetti, G.E. Kalmus, C. Cerri, B. Vallage, Fabrizio Petrucci, A. Ceccucci, Andrea Bizzeti, Leander Litov, P.L. Frabetti, A. Gianoli, Alan W. Walker, C. Morales Morales, M. Valdata, A. Dabrowski, M. C. Petrucci, Mayda Velasco, M. Markytan, M. Lenti, J.B. Cheze, G. Lamanna, Luca Fiorini, and R. Fantechi
Subjects: Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Branching fraction, Hadron, Analytical chemistry, Elementary particle, 01 natural sciences, Nuclear physics, 0103 physical sciences, 010306 general physics, Boson, Dimensionless quantity
Abstract: From the 2002 data taking with a neutral kaon beam extracted from the CERN-SPS, the NA48/1 experiment observed 97 Ξ 0 → Σ + μ − ν ¯ μ candidates with a background contamination of 30.8 ± 4.2 events. From this sample, the BR ( Ξ 0 → Σ + μ − ν ¯ μ ) is measured to be ( 2.17 ± 0.32 stat ± 0.17 syst ) × 10 − 6 .
Published: 2013

3. New measurement of the K±→π+π−e±ν (Ke4) decay branching ratio and hadronic form factors

Author: Cvetan Valeriev Cheshkov, Stoyan Stoynev, W. Kubischta, A. Gianoli, Simone Bifani, M. Scarpa, M. Markytan, M. Lenti, D. J. Munday, G. Ruggiero, P. Rubin, S. Venditti, A.I. Zinchenko, V. Falaleev, Ivan Mikulec, M. Wache, E. Iacopini, S. Balev, M. Martini, D. T. Madigozhin, M. Sozzi, E. Monnier, A. Gonidec, S. A. Wotton, L. DiLella, B. Renk, Konrad Kleinknecht, E. Mazzucato, Mauro Piccini, Massimiliano Fiorini, E. Gersabeck, M. C. Petrucci, D. Coward, M. Valdata-Nappi, R. Fantechi, A. Peters, Peter Zahariev Hristov, G. Collazuol, Milene Calvetti, Manfred Jeitler, Vladimir Kekelidze, C. Morales Morales, Jacqueline Batley, P. Cenci, Wood, S. Giudici, A. Cotta Ramusino, Mayda Velasco, M. Veltri, S. Goy Lopez, H. Dibon, M. Ziolkowski, J. Derre, I. Mannelli, A. Norton, Roland Winston, G. Lamanna, C. Lazzeroni, G. Anzivino, G.M. Pierazzini, Roberta Arcidiacono, Mauro Raggi, G. Marel, U. Moosbrugger, J.B. Cheze, A. Michetti, F. Marchetto, Rainer Wanke, Fabrizio Petrucci, Cristina Biino, V. Kozhuharov, P. Marouelli, E. Imbergamo, Luca Fiorini, L. Widhalm, B. Vallage, Leander Litov, L. Masetti, P.L. Frabetti, Mark Slater, W. Baldini, A. Winhart, L. Gatignon, Alan W. Walker, E. C. Swallow, Anne Dabrowski, G. Neuhofer, Nicolo Cartiglia, M. Pepe, F. Costantini, M. Holder, N. A. Molokanova, A. Nappi, D.C. Cundy, K. Eppard, G. Bocquet, Yu. Potrebenikov, T. Fonseca Martin, M. Patel, Marco Clemencic, I. Polenkevich, M. De Beer, M. Behler, A. Ceccucci, Andrea Bizzeti, Michal Szleper, Evgueni Goudzovski, Nicola Cabibbo, H. D. Wahl, M. Fidecaro, B. Peyaud, M. Savrie, B. Bloch-Devaux, G.E. Kalmus, C. Cerri, N. Doble, C. Damiani, M. Shieh, P. F. Dalpiaz, and A. A. Maier
Subjects: Normalization (statistics), Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Branching fraction, Scattering, Hadron, Form factor (quantum field theory), 01 natural sciences, Nuclear physics, 0103 physical sciences, Pi, Relative precision, 010306 general physics
Abstract: A sample of more than one million K±→π+π−e±ν ( Ke4 ) decay candidates with less than one percent background contamination has been collected by the NA48/2 experiment at the CERN SPS in 2003–2004, allowing a detailed study of the decay properties. The branching ratio, inclusive of Ke4γ decays, is measured to be BR(Ke4)=(4.257±0.016exp±0.031ext)×10−5 with a total relative error of 0.8% . This measurement complements the study of S- and P-wave hadronic form factors by assigning absolute values to the relative hadronic form factors obtained earlier in a simultaneous analysis of the ππ scattering lengths conducted on the same data sample. The overall form factor normalization fs=5.705±0.017exp±0.031ext is obtained with a total relative precision of 0.6% .
Published: 2012

4. New measurement of the K±→π±μ+μ− decay

Author: A. Gonidec, G. Collazuol, Milene Calvetti, H. Dibon, H. D. Wahl, Nicola Cabibbo, C. Cheshkov, V. Kozhuharov, Mauro Raggi, M. Fidecaro, M. Savrie, B. Bloch-Devaux, B. Peyaud, E. Iacopini, M. Sozzi, D. Coward, G. Neuhofer, F. Marchetto, G.E. Kalmus, S. A. Wotton, L. Widhalm, M. De Beer, D.C. Cundy, Massimiliano Fiorini, Wood, Vladimir Kekelidze, Fabrizio Petrucci, G. Bocquet, Yu. Potrebenikov, G. Marel, Rainer Wanke, N. Doble, A. Winhart, P. Rubin, A. Nappi, M. Pepe, Simone Bifani, M. Markytan, M. Lenti, B. Vallage, M. Behler, W. Kubischta, E. C. Swallow, C. Lazzeroni, Leander Litov, J.B. Cheze, Evgueni Goudzovski, D. J. Munday, M. Holder, I. Mannelli, Luca Fiorini, Cristina Biino, M. Veltri, S. Goy Lopez, A. Ceccucci, A. Peters, Andrea Bizzeti, A. Norton, Roland Winston, Ivan Mikulec, A. I. Zinchenko, A. A. Maier, V. Falaleev, C. Cerri, E. Marinova, M. Scarpa, Enrico Celeghini, A. Dabrowski, G.M. Pierazzini, T. Fonseca Martin, Maulik R. Patel, Mauro Piccini, M. C. Petrucci, L. Masetti, A. Gianoli, C. Damiani, M. Ziolkowski, Konrad Kleinknecht, Manfred Jeitler, S. Stoynev, P. Marouelli, S. Giudici, B. Renk, M. Valdata-Nappi, G. Anzivino, Alan W. Walker, M. Shieh, S. Balev, M. Martini, W. Baldini, P. L. Frabetti, M. Wache, Nicolo Cartiglia, D. T. Madigozhin, A. Michetti, E. Mazzucato, N. A. Molokanova, K. Eppard, Marco Clemencic, C. Morales Morales, Mayda Velasco, I. Polenkevich, Mark Slater, M. Szleper, E. Imbergamo, F. Costantini, L. Di Lella, P. F. Dalpiaz, S. Venditti, G. Lamanna, U. Moosbrugger, A. Cotta Ramusino, E. Monnier, Lau Gatignon, P. Cenci, Jacqueline Batley, G. Ruggiero, P. Hristov, J. Derre, Roberta Arcidiacono, and R. Fantechi
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Antiparticle, Muon, Pion, Meson, Branching fraction, Analytical chemistry, Lepton, Dimensionless quantity
Abstract: A sample of 3120 K ± → π ± μ + μ − decay candidates with ( 3.3 ± 0.7 ) % background contamination has been collected by the NA48/2 experiment at the CERN SPS, allowing a detailed study of the decay properties. The branching ratio was measured to be BR = ( 9.62 ± 0.25 ) × 10 − 8 . The form factor W ( z ) , where z = ( M μ μ / M K ) 2 , was parameterized according to several models. In particular, the slope of the linear form factor W ( z ) = W 0 ( 1 + δ z ) was measured to be δ = 3.11 ± 0.57 . Upper limits of 2.9 × 10 − 2 and 2.3 × 10 − 2 on possible charge asymmetry and forward–backward asymmetry were established at 90% CL. An upper limit BR ( K ± → π ∓ μ ± μ ± ) 1.1 × 10 − 9 was established at 90% CL for the rate of the lepton number violating decay.
Published: 2011

5. New precise measurements of the and decay asymmetries

Author: S. Stoynev, E. Monnier, R. Sacco, U. Moosbrugger, Nadia Pastrone, M. Valdata, M. Calvetti, B. Vallage, N. A. Molokanova, K. Eppard, M. C. Petrucci, Roberta Arcidiacono, D. T. Madigozhin, G. Ruggiero, Marco Clemencic, R. Fantechi, P. F. Dalpiaz, A. Maier, F. Costantini, E. Mazzucato, A. Winhart, T. Fonseca Martin, Mauro Piccini, E. Imbergamo, C. Cerri, P. Lubrano, A. Michetti, A. Nappi, H. Dibon, Anne Dabrowski, Lau Gatignon, M. Pepe, M. Ziolkowski, M. Markytan, B. Panzer-Steindel, G. Neuhofer, C. Morales Morales, M. Lenti, Leander Litov, G. Lamanna, E. Menichetti, D.C. Cundy, M. De Beer, A. Ceccucci, Andrea Bizzeti, Cristina Biino, P. Cenci, P.L. Frabetti, S. Goy Lopez, F. Marchetto, Jacqueline Batley, Manfred Jeitler, L. Widhalm, Mayda Velasco, E. Iacopini, H. D. Wahl, P. Grafström, M. Holder, F. Petrucci, P. Rubin, M. Scarpa, M. Behler, U. Koch, G. Pierazzini, Alan W. Walker, W. Wislicki, B. Peyaud, G. Bocquet, Yu. Potrebenikov, G. Anzivino, A. Gonidec, A. I. Zinchenko, M. Sozzi, G. Gouge, A. Hirstius, S. A. Wotton, C. Cheshkov, S. Giudici, J.B. Cheze, M. Savrie, C. Lazzeroni, M. Slater, A. Gianoli, Niels Doble, D.J. Munday, Evgueni Goudzovski, I. Mannelli, L. Fiorini, L. Masetti, V. Falaleev, M. Veltri, A. Norton, Roland Winston, Nicolo Cartiglia, P. Marouelli, W. Baldini, Konrad Kleinknecht, P. Debu, G. Collazuol, G. Marel, Maulik R. Patel, M. Martini, M. Eppard, W. Kubischta, Rainer Wanke, E. C. Swallow, G. Kalmus, A. Peters, Ivan Mikulec, Peter Zahariev Hristov, and Vladimir Kekelidze
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Hyperon, Gamma ray, Elementary particle, Fermion, 01 natural sciences, Nuclear physics, Baryon, Particle decay, 0103 physical sciences, 010306 general physics, Radioactive decay
Abstract: The decay asymmetries of the weak radiative hyperon decays Ξ 0 → Λ γ and Ξ 0 → Σ 0 γ have been measured with high precision using data of the NA48/1 experiment at CERN. From about 52 000 Ξ 0 → Λ γ and 15 000 Ξ 0 → Σ 0 γ decays, we obtain for the decay asymmetries α Ξ 0 → Λ γ = − 0.704 ± 0.019 stat ± 0.064 syst and α Ξ 0 → Σ 0 γ = − 0.729 ± 0.030 stat ± 0.076 syst , respectively. These results are in good agreement with previous experiments, but more precise.
Published: 2010

6. Empirical parameterization of the K±→π±π0π0 decay Dalitz plot

Author: E. Monnier, A. Winhart, A. Nappi, C. Lazzeroni, B. Renk, T. Fonseca Martin, M. Holder, Mauro Piccini, F. Costantini, P. L. Frabetti, A. Michetti, Jacqueline Batley, Peter Zahariev Hristov, B. Vallage, S. Bifani, G.M. Pierazzini, Vladimir Kekelidze, M. Slater, M. Szleper, Cristina Biino, I. Polenkevich, J.B. Cheze, A. Cotta Ramusino, A. A. Maier, Luca Fiorini, I. Mannelli, A. Ceccucci, Andrea Bizzeti, C. Damiani, A. I. Zinchenko, P. Rubin, M. D. Wood, M. Sozzi, C. Cheshkov, E. Imbergamo, Massimiliano Fiorini, Nicolo Cartiglia, A. Peters, S. A. Wotton, Manfred Jeitler, S. Balev, M. Martini, H. D. Wahl, M. Fidecaro, A. Gianoli, Ivan Mikulec, N. Doble, U. Moosbrugger, Stoyan Stoynev, B. Peyaud, L. DiLella, Lau Gatignon, Nicola Cabibbo, W. Kubischta, M. Scarpa, G. Anzivino, M. Savrie, P. Cenci, G. Lamanna, B. Bloch-Devaux, D. J. Munday, M. Veltri, A. Dabrowski, S. Goy Lopez, G.E. Kalmus, M. Shieh, M. C. Petrucci, J. Derre, A. Norton, Roland Winston, M. De Beer, Roberta Arcidiacono, C. Cerri, M. Wache, D. T. Madigozhin, S. Giudici, M. Behler, E. Marinova, P. Marouelli, G. Neuhofer, E. Mazzucato, P. F. Dalpiaz, Konrad Kleinknecht, W. Baldini, D.C. Cundy, M. Pepe, V. Falaleev, C. Morales Morales, D. Coward, Mayda Velasco, M. Valdata-Nappi, Marco Clemencic, S. Venditti, M. Markytan, M. Lenti, Maulik R. Patel, F. Marchetto, L. Widhalm, G. Ruggiero, A. Gonidec, G. Collazuol, G. Marel, Rainer Wanke, A. J. Culling, E. C. Swallow, Fabrizio Petrucci, Leander Litov, Alan W. Walker, N. A. Molokanova, K. Eppard, Evgueni Goudzovski, Lucia Masetti, E. Iacopini, R. Fantechi, Milene Calvetti, H. Dibon, Mauro Raggi, M. Ziolkowski, G. Bocquet, Yu. Potrebenikov, and V. Kozhuharov
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Monte Carlo method, Dalitz plot, 01 natural sciences, Pion, Isospin, 0103 physical sciences, Quasinormal mode, High Energy Physics::Experiment, Invariant mass, Anomaly (physics), Nuclear Experiment, 010306 general physics
Abstract: As first observed by the NA48/2 experiment at the CERN SPS, the π0π0 invariant mass (M00) distribution from K±→π±π0π0 decay shows a cusp-like anomaly at M00=2m+, where m+ is the charged pion mass. An analysis to extract the ππ scattering lengths in the isospin I=0 and I=2 states, a0 and a2, respectively, has been recently reported. In the present work the Dalitz plot of this decay is fitted to a new empirical parameterization suitable for practical purposes, such as Monte Carlo simulations of K±→π±π0π0 decays.
Published: 2010

7. Measurement of the polarization of the Ξ0 (Ξ0¯) hyperon beam by the NA48/1 experiment

Author: M. Sozzi, C. Morales Morales, S. A. Wotton, W. Kubischta, G. Neuhofer, Cristina Biino, U. Moosbrugger, Ivan Mikulec, Niels Doble, D. J. Munday, Mayda Velasco, Rainer Wanke, A. Gonidec, P. Debu, D.C. Cundy, Marco Clemencic, A. Maier, Leander Litov, M. De Beer, E. Iacopini, Jacqueline Batley, G. Collazuol, H. D. Wahl, P.L. Frabetti, Nadia Pastrone, P. Grafström, Nicolo Cartiglia, G. Pierazzini, E. C. Swallow, D. T. Madigozhin, U. Koch, A. Winhart, Evgueni Goudzovski, T. Fonseca Martin, Mauro Piccini, B. Peyaud, P. Rubin, E. Mazzucato, Alan W. Walker, A. Peters, M. Eppard, R. Fantechi, Vladimir Kekelidze, Mark Slater, M. Markytan, M. Lenti, N. A. Molokanova, M. Holder, M. Martini, F. Petrucci, K. Eppard, Konrad Kleinknecht, M. Behler, E. Imbergamo, V. Falaleev, H. Dibon, A. I. Zinchenko, M. Savrie, R. Sacco, B. Panzer-Steindel, G. Bocquet, Yu. Potrebenikov, A. Gianoli, F. Costantini, G. Marel, F. Marchetto, M. Patel, Michael Ziolkowski, A. Michetti, L. Widhalm, M. Scarpa, M. Valdata, A. Dabrowski, W. Wislicki, M. C. Petrucci, A. Hirstius, S. Stoynev, E. Menichetti, G. Lamanna, E. Monnier, G. Ruggiero, C. Cheshkov, M. Pepe, G.E. Kalmus, C. Lazzeroni, P. Lubrano, A. Nappi, C. Cerri, A. Ceccucci, Andrea Bizzeti, Manfred Jeitler, G. Anzivino, I. Mannelli, G. Gouge, L. Fiorini, L. Masetti, S. Giudici, B. Vallage, P. F. Dalpiaz, J.B. Cheze, P. Hristov, Roberta Arcidiacono, M. Calvetti, Lau Gatignon, P. Cenci, M. Veltri, S. Goy Lopez, A. Norton, Roland Winston, P. Marouelli, and W. Baldini
Subjects: Physics, Nuclear and High Energy Physics, Meson, Proton, 010308 nuclear & particles physics, Hadron, Hyperon, 7. Clean energy, 01 natural sciences, Xi baryon, Nuclear physics, Baryon, Pion, 0103 physical sciences, 010306 general physics, Nucleon
Abstract: A total of 368 415 Ξ 0 → Λ π 0 and 31 171 Ξ 0 ¯ → Λ ¯ π 0 were selected from data recorded in the NA48/1 experiment during 2002 data taking. From this sample, the polarization of Ξ 0 and Ξ 0 ¯ hyperons was measured to be P Ξ 0 = − 0.102 ± 0.012 (stat) ± 0.008 (syst) and P Ξ 0 ¯ = − 0.01 ± 0.04 (stat) ± 0.008 (syst) . The dependence of P Ξ 0 on the Ξ 0 transverse momentum with respect to the primary proton beam is also presented. With the same data sample, the ratio of Ξ 0 ¯ and Ξ 0 fluxes in proton collisions at 400 GeV / c on a beryllium target was measured.
Published: 2009

8. First observation and measurement of the decay K±→π±e+e−γ

Author: Rainer Wanke, R. Fantechi, A. Ceccucci, Andrea Bizzeti, Marco Clemencic, F. Costantini, C. Cerri, I. Polenkevich, M. D. Wood, Milene Calvetti, G. Ruggiero, G.M. Pierazzini, J. Derre, I. Mannelli, A. Gonidec, B. Vallage, E. C. Swallow, P. Rubin, Roberta Arcidiacono, H. D. Wahl, M. Fidecaro, Evgueni Goudzovski, N. Doble, H. Dibon, G. Collazuol, S. Balev, M. Martini, R. Winston, B. Peyaud, L. Masetti, D. Coward, Cristina Lazzeroni, J.B. Cheze, M. Scarpa, T. Fonseca Martin, M. Holder, Mauro Raggi, B. Renk, Mauro Piccini, P. Hristov, Luca Fiorini, A.J. Culling, E. Marinova, E. Monnier, G. Neuhofer, D.J. Munday, G. Marel, A. Winhart, Nicola Cabibbo, W. Kubischta, M. Shieh, C. Cheshkov, V. Kozhuharov, D.C. Cundy, S. Stoynev, Nicolo Cartiglia, M. Pepe, Cristina Biino, Ivan Mikulec, Lau Gatignon, M. Savrie, E. Iacopini, A. A. Maier, P. F. Dalpiaz, P. Marouelli, B. Bloch-Devaux, P. Cenci, C. Handel, M. Veltri, F. Marchetto, C. Damiani, M.W. Slater, L. Widhalm, Manfred Jeitler, W. Baldini, G.E. Kalmus, V. Falaleev, A. Zinchenko, M. Ziolkowski, M. De Beer, G. Anzivino, J. R. Batley, A. Peters, S. Goy Lopez, A. Norton, M. Behler, G. Bocquet, Yu. Potrebenikov, A. Nappi, S. Wotton, Vladimir Kekelidze, S. Giudici, M. Sozzi, L. DiLella, M. Wache, Massimiliano Fiorini, D. T. Madigozhin, E. Mazzucato, C. Morales Morales, Mayda Velasco, M. Markytan, M. Lenti, A. Gianoli, Enrico Celeghini, A. Dabrowski, M. C. Petrucci, Maulik R. Patel, Konrad Kleinknecht, M. Valdata-Nappi, F. Martelli, M. Szleper, Simone Bifani, U. Moosbrugger, E. Imbergamo, A. Cotta Ramusino, G. Lamanna, Fabrizio Petrucci, Leander Litov, Alan W. Walker, P. L. Frabetti, A. Michetti, N. A. Molokanova, and K. Eppard
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Chiral perturbation theory, Meson, 010308 nuclear & particles physics, Branching fraction, Hadron, Analytical chemistry, 01 natural sciences, Nuclear physics, Particle decay, Pion, 0103 physical sciences, 010306 general physics, Dimensionless quantity
Abstract: Using the full data set of the NA48/2 experiment, the decay K ± → π ± e + e − γ is observed for the first time, selecting 120 candidates with 7.3 ± 1.7 estimated background events. With K ± → π ± π D 0 as normalisation channel, the branching ratio is determined in a model-independent way to be Br ( K ± → π ± e + e − γ , m e e γ > 260 MeV / c 2 ) = ( 1.19 ± 0.12 stat ± 0.04 syst ) × 10 −8 . This measured value and the spectrum of the e + e − γ invariant mass allow a comparison with predictions of chiral perturbation theory.
Published: 2008

9. Measurement of the Dalitz plot slope parameters of the K±→π±π+π− decay

Author: Enrico Celeghini, P. Marouelli, Leander Litov, A. Dabrowski, S. Giudici, M. C. Petrucci, B. Vallage, M. Sozzi, G. Ruggiero, M. Holder, Michael Ziolkowski, A. Peters, F. Petrucci, Alan W. Walker, E. Imbergamo, M. Savrie, Augusto Ceccucci, G. Bocquet, Yu. Potrebenikov, Cristina Biino, Ivan Mikulec, P. L. Frabetti, Lau Gatignon, S. Stoynev, F. Martelli, J.B. Cheze, M. Lenti, A. Michetti, E. Marinova, I. Mannelli, C. Lazzeroni, F. Costantini, G. Neuhofer, Nicolo Cartiglia, Vladimir Kekelidze, P. Cenci, M. Calvetti, A. Winhart, T. Fonseca Martin, Mauro Piccini, D.C. Cundy, C. Damiani, S. Balev, Marco Clemencic, M. Markytan, M. De Beer, Mark Slater, L. DiLella, M. Fidecaro, N. A. Molokanova, Maulik R. Patel, A. Cotta Ramusino, P. Hristov, S. A. Wotton, B. Peyaud, Evgueni Goudzovski, B. Renk, K. Eppard, Massimiliano Fiorini, V. Falaleev, M. Behler, A. Nappi, J. Derre, G. Lamanna, Nicola Cabibbo, Roberta Arcidiacono, C. Cheshkov, V. Kozhuharov, Andrea Bizzeti, B. Bloch-Devaux, G.E. Kalmus, P. Rubin, N. Doble, I. Polenkevich, Simone Bifani, M. D. Wood, Jacqueline Batley, C. Cerri, M. Veltri, Konrad Kleinknecht, M. Valdata-Nappi, Manfred Jeitler, R. Fantechi, D. Coward, H. Dibon, Wander Baldini, G. Anzivino, Mauro Raggi, G. Pierazzini, G. Marel, E. Iacopini, P. F. Dalpiaz, M. Wache, D. T. Madigozhin, E. Mazzucato, Rainer Wanke, A. J. Culling, E. C. Swallow, C. Morales Morales, H. Wahl, Mayda Velasco, A. I. Zinchenko, A. Gianoli, A. Gonidec, U. Moosbrugger, G. Collazuol, S. Goy Lopez, A. Maier, A. Norton, Roland Winston, W. Kubischta, E. Monnier, L. Fiorini, D. J. Munday, M. Pepe, M. Szleper, F. Marchetto, L. Widhalm, M. Scarpa, M. Martini, M. Shieh, and L. Masetti
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Dalitz plot, Particle Data Group, Atomic physics, Order of magnitude
Abstract: The distribution of the K ± → π ± π + π − decays in the Dalitz plot has been measured by the NA48/2 experiment at the CERN SPS with a sample of 4.71 × 10 8 fully reconstructed events. With the standard Particle Data Group parameterization the following values of the slope parameters were obtained: g = ( − 21.134 ± 0.017 ) % , h = ( 1.848 ± 0.040 ) % , k = ( − 0.463 ± 0.014 ) % . The quality and statistical accuracy of the data have allowed an improvement in precision by more than an order of magnitude, and are such as to warrant a more elaborate theoretical treatment, including pion–pion rescattering, which is in preparation.
Published: 2007

10. Measurement of Kμ30 form factors

Author: M. Sozzi, P. Debu, M. Cirilli, G. Fischer, S. A. Wotton, Konrad Kleinknecht, H. D. Wahl, E. Iacopini, H.G. Becker, P. Grafström, P. Lubrano, B. Peyaud, Anton Taurok, M. Eppard, A. Winhart, Nadia Pastrone, Benedetto Gorini, Cristina Biino, Ivan Mikulec, J. C. Chollet, V. Kekelidze, S.A. Schmidt, I.G. Knowles, B. Vallage, Milene Calvetti, Manfred Jeitler, I. Wingerter-Seez, H. Taureg, S. Wronka, H. Fox, R. Turlay, M. Wittgen, A. Lacourt, J. Cogan, A. Kalter, A. Gonidec, M. Markytan, H. Dibon, T.O. White, G. Unal, G. Collazuol, J. Duclos, G. Anzivino, A. Peters, Adrian John Bevan, E. Rondio, J. Ocariz, G. Graziani, G.D. Barr, C. Cheshkov, R. Fantechi, I. Mannelli, L. Gatignon, T.J. Gershon, Roberta Arcidiacono, Andrea Bizzeti, M. Lenti, B. Renk, G. Bocquet, Wojciech Wislicki, B. Panzer-Steindel, D. Madigozhin, R. Casali, M. De Beer, J.B. Cheze, U. Koch, A. Nappi, V. Falaleev, M. Piccini, Michael Ziolkowski, M. Contalbrigo, A. Zinchenko, Alexi Mestvirishvili, Louis Fayard, T. Cuhadar-Dönszelmann, R. Wanke, R.S. Dosanjh, R. Bernhard, N. Doble, L. Widhalm, Cristina Lazzeroni, A. Ceccucci, S. Stoynev, M. Martini, B. Hay, A. Maier, P. Hristov, A. Lai, I. Pellmann, S. Giudici, Andrea Formica, Giuseppe Ruggiero, D.J. Munday, Michal Szleper, A. Norton, J. Nassalski, L. Köpke, C. Cerri, E. Imbergamo, M. Pernicka, M. Savrie, E. Menichetti, F. Costantini, M. Pepe, G.E. Kalmus, G. D'Agostini, G. Govi, Nicolo Cartiglia, P. Cenci, Michael Andrew Parker, W. Kubischta, P. F. Dalpiaz, V. Schönharting, M. Holder, M. Veltri, G.M. Pierazzini, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, L. Bertanza, G. Neuhofer, R. Carosi, D.C. Cundy, Y. Schué, R. Sacco, A. Gianoli, R. Granier de Cassagnac, E. Olaiya, Yu. Potrebenikov, E. Mazzucato, F. Petrucci, Victoria Jane Martin, Mayda Velasco, Sandro Palestini, F. Marchetto, N. A. Molokanova, K. Eppard, Leander Litov, P.L. Frabetti, Alan W. Walker, and D. Marras
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Form factor (quantum field theory), Dalitz plot, NA48 experiment, 010306 general physics, 01 natural sciences
Abstract: This Letter reports on a new high precision measurement of the form factors of the K L → π ± μ ∓ ν μ decay. The data sample of about 2.3 × 10 6 events was recorded in 1999 by the NA48 experiment at CERN. Studying the Dalitz plot density we measured a linear, λ + ′ = ( 20.5 ± 2.2 stat ± 2.4 syst ) × 10 −3 , and a quadratic, λ + ″ = ( 2.6 ± 0.9 stat ± 1.0 syst ) × 10 −3 term in the power expansion of the vector form factor. No evidence was found for a second order term for the scalar form factor; the linear slope was determined to be λ 0 = ( 9.5 ± 1.1 stat ± 0.8 syst ) × 10 −3 . Using a linear fit our results were: λ + = ( 26.7 ± 0.6 stat ± 0.8 syst ) × 10 −3 and λ 0 = ( 11.7 ± 0.7 stat ± 1.0 syst ) × 10 −3 . A pole fit of the form factors yields: m V = ( 905 ± 9 stat ± 17 syst ) MeV / c 2 and m S = ( 1400 ± 46 stat ± 53 syst ) MeV / c 2 .
Published: 2007

11. Measurement of the ratio Γ(KL→π+π−)/Γ(KL→π±e∓ν) and extraction of the CP violation parameter |η+−

Author: P. Debu, T. Cuhadar-Dönszelmann, Sandro Palestini, R.S. Dosanjh, S. A. Wotton, M. Wittgen, Benedetto Gorini, J. Cogan, Rainer Wanke, Manfred Jeitler, P. F. Dalpiaz, H. D. Wahl, T.J. Gershon, A. Gaponenko, J. Duclos, M. Veltri, G. Anzivino, B. Peyaud, Michal Szleper, G.D. Barr, G. Fischer, Anton Taurok, Nadia Pastrone, Vladimir Kekelidze, A. Norton, G.M. Pierazzini, C. Cheshkov, B. Vallage, R. Fantechi, Fabrizio Petrucci, M. Savrie, A. I. Zinchenko, A. Kalter, Konrad Kleinknecht, Nicolo Cartiglia, Michael Andrew Parker, J. C. Chollet, Leander Litov, P.L. Frabetti, E. Menichetti, G.E. Kalmus, A. Peters, V. Schönharting, Milene Calvetti, A. Nappi, J. Ocariz, H. Taureg, I.G. Knowles, H.G. Becker, A. Gianoli, B. Renk, R. Granier de Cassagnac, R. Turlay, M. Pepe, Cristina Biino, Ivan Mikulec, Roberto Guida, Alan W. Walker, D.J. Munday, J. Nassalski, G. D'Agostini, F. Martelli, Augusto Ceccucci, Roberta Arcidiacono, S. Giudici, G. Govi, M. De Beer, P. Lopes da Silva, M. Pernicka, H. Dibon, B. Hay, Andrea Bizzeti, S. Wronka, W. Kubischta, N. A. Molokanova, Lydia Iconomidou-Fayard, P. Marouelli, Louis Fayard, F. Marchetto, G. Graziani, Michael Ziolkowski, K. Eppard, M. Holder, Victoria Jane Martin, U. Koch, D. Marras, A. Winhart, L. Widhalm, I. Mannelli, Mayda Velasco, Alexi Mestvirishvili, M. Eppard, Mauro Piccini, Wojciech Wislicki, P. Lubrano, V. Falaleev, M. Sozzi, S. Stoynev, G. Tatishvili, L. Bertanza, E. Rondio, E. Olaiya, A. Gonidec, D. T. Madigozhin, Lau Gatignon, S.A. Schmidt, M. Cirilli, Cristina Lazzeroni, Niels Doble, G. Collazuol, C. Cerri, A. Tkatchev, I. Pellmann, E. Mazzucato, T.O. White, G. Unal, M. Martini, R. Sacco, M. Markytan, M. Lenti, G. Bocquet, Yu. Potrebenikov, E. Iacopini, P. Cenci, E. Imbergamo, G. Neuhofer, M. Contalbrigo, P. Grafström, I. Wingerter-Seez, A. Maier, P. Hristov, R. Carosi, D.C. Cundy, L. Köpke, A. Lai, Andrea Formica, Adrian John Bevan, Y. Schué, F. Costantini, J.B. Cheze, B. Panzer-Steindel, H. Fox, and A. Lacourt
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Photon emission, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Extraction (chemistry), Analytical chemistry, NA48 experiment, CP violation, 010306 general physics, 01 natural sciences
Abstract: We present a measurement of the ratio of the decay rates Γ ( K L → π + π − ) / Γ ( K L → π ± e ∓ ν ) , denoted as Γ K 2 π / Γ K e 3 . The analysis is based on data taken during a dedicated run in 1999 by the NA48 experiment at the CERN SPS. Using a sample of 47 000 K 2 π and five million K e 3 decays, we find Γ K 2 π / Γ K e 3 = ( 4.835 ± 0.022 stat . ± 0.016 syst . ) × 10 −3 . From this we derive the branching ratio of the CP violating decay K L → π + π − and the CP violation parameter | η + − | . Excluding the CP conserving direct photon emission component K L → π + π − γ , we obtain the results BR ( K L → π + π − ) = ( 1.941 ± 0.019 ) × 10 −3 and | η + − | = ( 2.223 ± 0.012 ) × 10 −3 .
Published: 2007

12. Measurement of the branching ratios of the decays Ξ0→Σ+e−ν¯e and Ξ0¯→Σ+¯e+νe

Author: P. F. Dalpiaz, C. Morales Morales, U. Moosbrugger, M. Valdata, B. Panzer-Steindel, R. Fantechi, Konrad Kleinknecht, A. Dabrowski, C. Cheshkov, A. Maier, M. C. Petrucci, Michael Ziolkowski, G.E. Kalmus, M. De Beer, M. Behler, G. Ruggiero, Mayda Velasco, Nicolo Cartiglia, M. Patel, H. Dibon, Wander Baldini, Jacqueline Batley, S. Stoynev, V. Falaleev, Mark Slater, C. Cerri, E. Menichetti, D. T. Madigozhin, Nadia Pastrone, G. Pierazzini, B. Vallage, M. Sozzi, Leander Litov, E. Mazzucato, H. D. Wahl, Evgueni Goudzovski, J.B. Cheze, W. Kubischta, Augusto Ceccucci, P. Debu, P.L. Frabetti, F. Costantini, A. I. Zinchenko, G. Collazuol, D. J. Munday, E. Iacopini, M. Eppard, B. Peyaud, Cristina Biino, Ivan Mikulec, A. Peters, A. Gianoli, M. Holder, P. Grafström, M. Markytan, F. Petrucci, C. Lazzeroni, M. Veltri, Lau Gatignon, M. Savrie, M. Martini, G. Bocquet, Yu. Potrebenikov, Alan W. Walker, I. Mannelli, M. Calvetti, Andrea Bizzeti, Vladimir Kekelidze, A. Winhart, G. Marel, L. Masetti, Rainer Wanke, T. Fonseca Martin, F. Marchetto, A. Michetti, E. C. Swallow, Mauro Piccini, P. Cenci, N. A. Molokanova, K. Eppard, R. Sacco, G. Neuhofer, S. Giudici, D.C. Cundy, M. Lenti, P. Hristov, S. A. Wotton, U. Koch, Niels Doble, G. Lamanna, Marco Clemencic, E. Imbergamo, Roberta Arcidiacono, P. Rubin, S. Goy Lopez, A. Norton, Roland Winston, E. Monnier, L. Fiorini, M. Pepe, A. Gonidec, L. Widhalm, M. Scarpa, W. Wislicki, P. Marouelli, Manfred Jeitler, G. Anzivino, G. Gouge, P. Lubrano, A. Nappi, and A. Hirstius
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Cabibbo–Kobayashi–Maskawa matrix, 0103 physical sciences, Sigma, Particle Data Group, 010306 general physics, Branching (polymer chemistry), 01 natural sciences
Abstract: From 56 days of data taking in 2002, the NA48/1 experiment observed 6316 Ξ 0 → Σ + e − ν ¯ e candidates (with the subsequent Σ + → p π 0 decay) and 555 Ξ 0 ¯ → Σ + ¯ e + ν e candidates with background contamination of 215 ± 44 and 136 ± 8 events, respectively. From these samples, the branching ratios BR ( Ξ 0 → Σ + e − ν ¯ e ) = ( 2.51 ± 0.03 stat ± 0.09 syst ) × 10 −4 and BR ( Ξ 0 ¯ → Σ + ¯ e + ν e ) = ( 2.55 ± 0.14 stat ± 0.10 syst ) × 10 −4 were measured allowing the determination of the CKM matrix element | V us | = 0.209 −0.028 +0.023 . Using the Particle Data Group average for | V us | obtained in semileptonic kaon decays, we measured the ratio g 1 / f 1 = 1.20 ± 0.05 of the axial-vector to vector form factors.
Published: 2007

13. A measurement of the CP-conserving component of the decay KS0→π+π−π0

Author: Konrad Kleinknecht, G.M. Pierazzini, P. F. Dalpiaz, Augusto Ceccucci, W. Wislicki, L. Widhalm, Rainer Wanke, P. Debu, C. Cerri, M. Patel, W. Kubischta, S. A. Wotton, A. I. Zinchenko, Nadia Pastrone, N. A. Molokanova, U. Moosbrugger, A. Gianoli, B. Vallage, G. Graziani, K. Eppard, C. Cheshkov, M. Holder, G. Bocquet, Yu. Potrebenikov, E. C. Swallow, A. Peters, G. Ruggiero, Marco Clemencic, M. Wache, D.J. Munday, Andrea Bizzeti, P. Rubin, Roberta Arcidiacono, L. Masetti, M. Savrie, D. T. Madigozhin, A. Gonidec, V. Falaleev, Michael Ziolkowski, Nicolo Cartiglia, E. Menichetti, R. Sacco, G. Collazuol, E. Mazzucato, Cristina Lazzeroni, S. Stoynev, G. Neuhofer, P. Marouelli, E. Monnier, F. Marchetto, M. De Beer, I. Mannelli, D.C. Cundy, J.B. Cheze, A. Michetti, C. Morales Morales, S. Giudici, B. Panzer-Steindel, M. Pepe, M. Martini, Fabrizio Petrucci, Luca Fiorini, A. Maier, H. D. Wahl, P. Hristov, F. Costantini, M. Scarpa, Leander Litov, Manfred Jeitler, B. Peyaud, M. Behler, M. Veltri, P.L. Frabetti, M. Sozzi, S. Goy Lopez, Mayda Velasco, G. Marel, A. Norton, Roland Winston, G. Anzivino, Alan W. Walker, G. Gouge, D. Gurev, M. Eppard, Niels Doble, A. Hirstius, Evgueni Goudzovski, Lau Gatignon, A. Nappi, P. Cenci, Cristina Biino, Ivan Mikulec, M. Valdata, F. Martelli, Vladimir Kekelidze, E. Iacopini, P. Grafström, R. Fantechi, Milene Calvetti, H. Dibon, Wander Baldini, U. Koch, A. Winhart, T. Fonseca Martin, Mauro Piccini, M.W. Slater, J. R. Batley, M. Markytan, M. Lenti, A. Dabrowski, M. C. Petrucci, G. Lamanna, P. Lubrano, and E. Imbergamo
Subjects: Physics, Nuclear and High Energy Physics, Angular momentum, Amplitude, Chiral perturbation theory, 010308 nuclear & particles physics, Component (thermodynamics), Quantum mechanics, 0103 physical sciences, Pi, Perturbation theory, 010306 general physics, 01 natural sciences
Abstract: The NA48 Collaboration has measured the amplitude of the CP-conserving component of the decay K S 0 → π + π − π 0 relative to K L 0 → π + π − π 0 . For the characteristic parameter λ , the values Re λ = 0.038 ± 0.010 and Im λ = − 0.013 ± 0.007 have been extracted. These values agree with earlier measurements and with theoretical predictions from chiral perturbation theory.
Published: 2005

14. Measurement of the KL→e+e−e+e− decay rate

Author: M. Wittgen, Rainer Wanke, J. Cogan, T. Çuhadar, J. C. Chollet, U. Koch, M. Markytan, M. Lenti, I.G. Knowles, A. Winhart, G. Tatishvili, Mauro Piccini, S. Giudici, R. Fantechi, S. Wronka, I. Wingerter-Seez, Milene Calvetti, Nicolo Cartiglia, R.S. Dosanjh, Michael Andrew Parker, G.M. Pierazzini, G. Govi, N. A. Molokanova, A. Kalter, M. Eppard, H. D. Wahl, P. Lubrano, Adrian John Bevan, T.O. White, W. Kubischta, B. Hay, G. Unal, Vladimir Kekelidze, K. Eppard, H. Dibon, I. Mannelli, S.A. Schmidt, E. Rondio, B. Peyaud, V. Schönharting, Roberta Arcidiacono, E. Imbergamo, G. Graziani, P. F. Dalpiaz, Fabrizio Petrucci, Nadia Pastrone, R. Casali, H. Taureg, R. Turlay, D. Marras, Augusto Ceccucci, P.L. Frabetti, B. Vallage, M. Contalbrigo, I. Melzer-Pellmann, Alexi Mestvirishvili, J. Ocariz, T.J. Gershon, M. Sozzi, Benedetto Gorini, C. Cheshkov, A. I. Zinchenko, Louis Fayard, J.B. Cheze, F. Marchetto, B. Renk, V. Falaleev, Manfred Jeitler, H.G. Becker, Alan W. Walker, A. Gianoli, Sandro Palestini, E. Iacopini, A. Maier, P. Hristov, J. Duclos, G. Anzivino, M. Cirilli, Niels Doble, Andrea Bizzeti, Cristina Biino, Ivan Mikulec, A. Peters, Konrad Kleinknecht, Luca Fiorini, R. Granier de Cassagnac, G. Neuhofer, P. Grafström, G. Bocquet, Yu. Potrebenikov, Michael Ziolkowski, G.D. Barr, D.C. Cundy, G. Lamanna, D. Madigojine, M. Holder, C. Cerri, L. Widhalm, M. Pernicka, L. Köpke, Victoria Jane Martin, Y. Schué, A. Lai, Andrea Formica, Mayda Velasco, P. Debu, E. Olaiya, Lau Gatignon, F. Costantini, G. Ruggiero, A. Nappi, E. Mazzucato, S. A. Wotton, R. Sacco, Michal Szleper, Wojciech Wislicki, A. Gonidec, Cristina Lazzeroni, M. Savrie, P. Cenci, G. Collazuol, G. Fischer, E. Menichetti, Anton Taurok, G.E. Kalmus, M. De Beer, M. Martini, M. Pepe, G. D'Agostini, M.D. Needham, A. Norton, D.J. Munday, J. Nassalski, H. Fox, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, A. Lacourt, and B. Panzer-Steindel
Subjects: Physics, Nuclear and High Energy Physics, Meson, Branching fraction, Analytical chemistry, Atomic physics, Positron annihilation
Abstract: The decay rate of the long-lived neutral K meson into the e + e − e + e − final state has been measured with the NA48 detector at the CERN SPS. Using data collected in 1998 and 1999, a total of 200 events has been observed with negligible background. This observation corresponds to a branching ratio of Br ( K L → e + e − e + e − ) = ( 3.30 ± 0.24 stat ± 0.23 syst ± 0.10 norm ) × 10 −8 .
Published: 2005

15. Search for CP violation in K0→3π0 decays

Author: Konrad Kleinknecht, M. Holder, G. Graziani, W. Wislicki, A. Gonidec, M. Wittgen, E. Rondio, Andrea Bizzeti, J. C. Chollet, G. Collazuol, J. Nassalski, P. F. Dalpiaz, V. Falaleev, D. Madigojine, P. Lopes da Silva, Nadia Pastrone, R. Fantechi, I. Pellmann, Benedetto Gorini, G. Bocquet, Yu. Potrebenikov, T.J. Gershon, S. Giudici, T. Cuhadar-Dönszelmann, Milene Calvetti, Augusto Ceccucci, Vladimir Kekelidze, Manfred Jeitler, F. Martelli, A. Lai, Andrea Formica, R.S. Dosanjh, F. Derue, M. Martini, G.D. Barr, B. Vallage, G. Neuhofer, M. Markytan, J. Duclos, G. Anzivino, H. D. Wahl, Lydia Iconomidou-Fayard, M. Lenti, N. A. Molokanova, K. Eppard, P. Marouelli, C. Cerri, D.C. Cundy, G. Gouge, R. Turlay, H. Dibon, G. Marel, B. Peyaud, F. Costantini, Rainer Wanke, U. Koch, A. Peters, Y. Schué, M. Pepe, P. Debu, A. Winhart, C. Cheshkov, Fabrizio Petrucci, Mauro Piccini, G.M. Pierazzini, T.O. White, G. Unal, S. A. Wotton, P. Lubrano, W. Kubischta, B. Panzer-Steindel, P. Rubin, S.A. Schmidt, S. Wronka, Alexi Mestvirishvili, P.L. Frabetti, Nicolo Cartiglia, Michael Ziolkowski, E. Imbergamo, J.B. Cheze, Michael Andrew Parker, Luca Fiorini, Louis Fayard, F. Marchetto, D. Marras, L. Widhalm, E. Iacopini, Alan W. Walker, V. Schönharting, Cristina Biino, Ivan Mikulec, I. Wingerter-Seez, P. Grafström, M. Sozzi, G. Tatishvili, A. Nappi, M. Eppard, J. R. Batley, Massimiliano Fiorini, M. Cirilli, Niels Doble, Michal Szleper, R. Sacco, A. Lacourt, M. Savrie, E. Menichetti, G.E. Kalmus, M. De Beer, Roberta Arcidiacono, R. Casali, M. Veltri, Lau Gatignon, A. Norton, P. Cenci, M. Contalbrigo, A. Maier, P. Hristov, L. Köpke, D.J. Munday, Victoria Jane Martin, E. Olaiya, Cristina Lazzeroni, E. Mazzucato, A. I. Zinchenko, M. Pernicka, A. Gianoli, R. Granier de Cassagnac, A. Hirstius, Anton Taurok, I. Mestvirishvili, and I. Mannelli
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Amplitude, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Pi, CP violation, 010306 general physics, Lifetime distribution, 01 natural sciences
Abstract: Using data taken during the year 2000 with the NA48 detector at the CERN SPS, a search for the CP violating decay K S → 3 π 0 has been performed. From a fit to the lifetime distribution of about 4.9 million reconstructed K 0 / K ¯ 0 → 3 π 0 decays, the CP violating amplitude η 000 = A ( K S → 3 π 0 ) / A ( K L → 3 π 0 ) has been found to be Re ( η 000 ) = − 0.002 ± 0.011 ± 0.015 and Im ( η 000 ) = − 0.003 ± 0.013 ± 0.017 . This corresponds to an upper limit on the branching fraction of Br ( K S → 3 π 0 ) 7.4 × 10 −7 at 90% confidence level. The result is used to improve knowledge of Re ( e ) and the CPT violating quantity Im ( δ ) via the Bell–Steinberger relation.
Published: 2005

16. Observation of the rare decay KS→π0μ+μ−

Author: S Goy-Lopez, G. Kalmus, Cristina Biino, Nadia Pastrone, Ivan Mikulec, M. Markytan, M. Lenti, A. Peters, P. Rubin, Mauro Piccini, T. Fonseca Martin, C. Cerri, M. Valdata, Peter Zahariev Hristov, G. Ruggiero, Vladimir Kekelidze, Marco Clemencic, A. Gonidec, E. Iacopini, G. Collazuol, N. Doble, R. Sacco, A.I. Zinchenko, P. Grafström, M. Holder, P. Lubrano, M. C. Petrucci, G. Bocquet, Yu. Potrebenikov, Roberta Arcidiacono, R. Fantechi, G.M. Pierazzini, U. Koch, Milene Calvetti, E. Imbergamo, E. Monnier, H. Dibon, Wander Baldini, H. D. Wahl, Mayda Velasco, L. Gatignon, G. Neuhofer, Nicolo Cartiglia, Cristina Lazzeroni, Anne Dabrowski, M. Pepe, Cvetan Valeriev Cheshkov, Manfred Jeitler, D.C. Cundy, P. F. Dalpiaz, J.B. Cheze, F. Costantini, M. Ziolkowski, A. Gianoli, B. Peyaud, N. A. Molokanova, Luca Fiorini, J. Duclos, K. Eppard, G. Anzivino, G. Lamanna, V. Kozhuharov, F. Marchetto, D. T. Madigozhin, L. Widhalm, E. Mazzucato, W. Wislicki, G. Gouge, I. Mannelli, A. A. Maier, M. W. Slater, L. Masetti, S. Giudici, A. Hirstius, G. Marel, Rainer Wanke, Fabrizio Petrucci, P. Cenci, Leander Litov, Jacqueline Batley, U. Moosbrugger, P.L. Frabetti, B. Vallage, Alan W. Walker, Evgueni Goudzovski, M. Sozzi, Michal Szleper, A. Michetti, S. A. Wotton, M. Savrie, D. Gurev, E. Menichetti, A. Ceccucci, Andrea Bizzeti, A. Nappi, M. De Beer, B. Panzer-Steindel, M. Behler, M. Scarpa, M. Martini, G. Graziani, V. Falaleev, A. Winhart, E. C. Swallow, P. Marouelli, C. Morales Morales, P. Debu, Stoyan Stoynev, W. Kubischta, M. Eppard, D. J. Munday, M. Veltri, A. Norton, Roland Winston, Maulik R. Patel, F. Martelli, and Konrad Kleinknecht
Subjects: mesoni K, decadimenti rari, Physics, Nuclear and High Energy Physics, Large Hadron Collider, 010308 nuclear & particles physics, Branching fraction, Form factor (quantum field theory), 01 natural sciences, Nuclear physics, 0103 physical sciences, Pi, CP violation, Matrix element, 010306 general physics
Abstract: A search for the decay KS→π0μ+μ−KS→π0μ+μ− has been made by the NA48/1 Collaboration at the CERN SPS accelerator. The data were collected during 2002 with a high-intensity KSKS beam. Six events were found with a background expectation of 0.22−0.11+0.18 events. Using a vector matrix element and unit form factor, the measured branching ratio is B(KS→π0μ+μ−)=[2.9−1.2+1.5(stat)±0.2(syst)]×10−9.
Published: 2004

17. Measurement of the Ξ0→Λγ decay asymmetry and branching fraction

Author: G. Tatishvili, Lau Gatignon, D. Marras, A. Tkatchev, M. Sozzi, Benedetto Gorini, P. Cenci, M. Cirilli, Niels Doble, G. Govi, M. De Beer, Manfred Jeitler, M. Holder, A. Kalter, Roberta Arcidiacono, R. Casali, W. Kubischta, M. Contalbrigo, E. Olaiya, J. Duclos, A. Winhart, P. Debu, A. Maier, G. Anzivino, P. Hristov, Mauro Piccini, L. Köpke, P. F. Dalpiaz, I. Wingerter-Seez, T.O. White, G. Unal, S. A. Wotton, Rainer Wanke, Nadia Pastrone, C. Cheshkov, E. Mazzucato, T.J. Gershon, Adrian John Bevan, A. Gaponenko, G.D. Barr, H. Fox, R. Turlay, B. Vallage, M. Markytan, M. Lenti, M. Pepe, G. D'Agostini, Nicolo Cartiglia, A. I. Zinchenko, A. Lacourt, Michael Andrew Parker, F. Martelli, E. Rondio, J. C. Chollet, M. Martini, I.G. Knowles, Alexi Mestvirishvili, Augusto Ceccucci, E. Iacopini, J.B. Cheze, A. Peters, D. Madigojine, S. Giudici, A. Gianoli, N. A. Molokanova, T. Cuhadar-Dönszelmann, K. Eppard, P. Grafström, A. Nappi, A. Gonidec, R. Granier de Cassagnac, Roberto Guida, G.M. Pierazzini, R.S. Dosanjh, G. Collazuol, Konrad Kleinknecht, H.G. Becker, Cristina Biino, Ivan Mikulec, S. Wronka, V. Schönharting, G. Graziani, R. Fantechi, M. Wittgen, Michal Szleper, B. Hay, J. Cogan, V. Falaleev, I. Pellmann, Milene Calvetti, M. Savrie, H. Dibon, P. Lubrano, B. Panzer-Steindel, S.A. Schmidt, E. Menichetti, G. Neuhofer, Sandro Palestini, G.E. Kalmus, Louis Fayard, R. Carosi, F. Marchetto, D.C. Cundy, Vladimir Kekelidze, L. Widhalm, A. Lai, Andrea Formica, Y. Schué, E. Imbergamo, F. Costantini, Victoria Jane Martin, M. Eppard, R. Sacco, G. Bocquet, Yu. Potrebenikov, U. Koch, Mayda Velasco, M. Veltri, A. Norton, G. Fischer, Anton Taurok, D.J. Munday, J. Nassalski, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, L. Bertanza, M. Pernicka, Wojciech Wislicki, J. Ocariz, B. Renk, Cristina Lazzeroni, H. D. Wahl, B. Peyaud, I. Mannelli, Michael Ziolkowski, H. Taureg, Andrea Bizzeti, C. Cerri, Fabrizio Petrucci, P.L. Frabetti, and Alan W. Walker
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, Large Hadron Collider, Branching fraction, media_common.quotation_subject, iperoni Xi0, Hyperon, Radiative decay, NA48 experiment, Asymmetry, Nuclear physics, decadimenti radiativi, Radiative transfer, media_common
Abstract: In data taken with the NA48 experiment at the CERN SPS in 1999, 730 candidates of the weak radiative hyperon decay Ξ0→Λγ have been found with an estimated background of 58±8 events. From these events the Ξ0→Λγ decay asymmetry has been determined to α(Ξ0→Λγ)=-0.78±0.18stat±0.06 syst, which is the first evidence of a decay asymmetry in Ξ 0→Λγ. The branching fraction of the decay has been measured to be Br(Ξ0→Λγ)=(1.16±0.05 stat±0.06syst)×10-3. © 2004 Elsevier B.V. All rights reserved.
Published: 2004
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18. Observation of the decay KS→π+π−e+e−

Author: C. Cheshkov, U. Koch, G. Govi, W. Kubischta, E. Iacopini, P. Grafström, G. Bocquet, Yu. Potrebenikov, Nadia Pastrone, A. Winhart, A. Lai, Mauro Piccini, B. Vallage, P. Debu, R. Fantechi, Andrea Formica, Lydia Iconomidou-Fayard, Milene Calvetti, J. C. Chollet, I. Mannelli, A. Nappi, M. Eppard, I.G. Knowles, Michal Szleper, M. Savrie, E. Menichetti, R.S. Dosanjh, F. Costantini, G.E. Kalmus, Sandro Palestini, M. De Beer, P. Lubrano, H. Dibon, S. Giudici, Giacomo Graziani, A. Peters, S. Wronka, M. Wittgen, M. Holder, Benedetto Gorini, S.A. Schmidt, D. Marras, R. Turlay, S. A. Wotton, M. Contalbrigo, K. Holtz, J. Cogan, Manfred Jeitler, M. Sozzi, M. Bender, G.D. Barr, Wojciech Wislicki, E. Imbergamo, H. D. Wahl, E. Olaiya, J. Duclos, D.J. Munday, G. Anzivino, J. Nassalski, Michael Andrew Parker, M. Cirilli, N. A. Molokanova, J. Ocariz, Niels Doble, B. Renk, P. F. Dalpiaz, P. Hristov, E. Rondio, I. Pellmann, E. Mazzucato, I. Augustin, G. Fischer, M. Pepe, G. D'Agostini, T.O. White, G. Unal, T.J. Gershon, M.D. Needham, B. Peyaud, Anton Taurok, B. Hay, R. Sacco, Fabrizio Petrucci, L. Köpke, A. Gonidec, Augusto Ceccucci, V. Schönharting, M. Markytan, M. Lenti, P.L. Frabetti, G. Collazuol, J.B. Cheze, Vladimir Kekelidze, Victoria Jane Martin, G.M. Pierazzini, G. Tatishvili, Lau Gatignon, Mayda Velasco, Michael Ziolkowski, A. Mestvirishvili, A. Tkatchev, M. Martini, H. Parsons, Louis Fayard, F. Marchetto, Alan W. Walker, A. I. Zinchenko, Konrad Kleinknecht, P. Cenci, H. Taureg, H.G. Becker, H. Blümer, A. Gianoli, C. Lazzeroni, A. Kalter, R. Granier de Cassagnac, Cristina Biino, Ivan Mikulec, G. Neuhofer, S. Crépé, V. Falaleev, R. Carosi, D. Madigojine, Luciano Musa, M. Pernicka, Roberta Arcidiacono, D.C. Cundy, Andrea Bizzeti, R. Casali, A. Norton, Y. Schué, B. Panzer-Steindel, H. Fox, A. Lacourt, C. Cerri, I. Wingerter-Seez, and Adrian John Bevan
Subjects: mesoni K, decadimenti rari, Physics, Nuclear physics, Nuclear and High Energy Physics, Branching fraction, Bremsstrahlung, NA48 experiment
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−π0D 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.
Published: 2000

19. Measurement of the decay rate and form factor parameter in the decay KL→e+e−γ

Author: H.G. Becker, Cristina Biino, Ivan Mikulec, Vladimir Kekelidze, R. Turlay, M. Holder, D. Marras, G. Fischer, A. Gonidec, A. I. Zinchenko, Michael Ziolkowski, S. Luitz, I. Potrebenikov, Anton Taurok, G. Collazuol, M. Sozzi, S. A. Wotton, E. Iacopini, G. Govi, Konrad Kleinknecht, S. Schanne, A. Gianoli, Paolo Calafiura, Matthew Needham, B. Vallage, P. Grafström, R.W. Moore, I. Mannelli, J. Nassalski, R. Granier de Cassagnac, A. Lai, Andrea Formica, G. Kesseler, J.B. Cheze, M. Cirilli, Niels Doble, W. Kubischta, Michal Szleper, O. Boyle, P. F. Dalpiaz, A. Nappi, P. Hristov, P. Lubrano, P. Debu, R. Fantechi, H. D. Wahl, Giacomo Graziani, A. Mestvirishvili, M. Savrie, U. Koch, A. Winhart, Louis Fayard, G. Neuhofer, F. Marchetto, J. C. Chollet, F. Costantini, D. J. Munday, Milene Calvetti, H. Blümer, L. Köpke, M. Bender, I.G. Knowles, P. Buchholz, E. Menichetti, A. Kalter, B. Peyaud, M. Martini, Lydia Iconomidou-Fayard, D. Schinzel, J. Scheidt, B. Hay, Victoria Jane Martin, W. Wislicki, Michael Andrew Parker, S. Giudici, M. De Beer, E. Rondio, H. Dibon, J. Ocariz, Roberta Arcidiacono, G.D. Barr, H. Taureg, B. Renk, Augusto Ceccucci, S. Wronka, Mayda Velasco, V. Fanti, I. Wingerter, V. Schönharting, G. Tatishvili, O. Vossnack, Lau Gatignon, Benedetto Gorini, G. Unal, M. Porcu, A. Tkatchev, M. Pepe, D. Coward, Manfred Jeitler, J.P. Matheys, C. Cerri, J. Schmidt, Luciano Musa, G. Bocquet, I. Augustin, K.N. Moore, J. Duclos, Andrea Bizzeti, P. Cenci, J. Bremer, G. Anzivino, A. Norton, M. Pernicka, C. Ebersberger, G. Wirrer, D. Vattolo, S. Crépé, E. Mazzucato, M. Markytan, M. Lenti, H. Fox, A. Lacourt, R. Wilhelm, B. Panzer-Steindel, Fabrizio Petrucci, P.L. Frabetti, T. O. White, H. Parsons, Sandro Palestini, A. Michetti, Wolfgang Funk, R. Carosi, D.C. Cundy, Y. Schué, G.M. Pierazzini, M. Wittgen, and J. Cogan
Subjects: Pseudoscalar, Physics, Nuclear physics, Nuclear and High Energy Physics, Amplitude, Meson, Branching fraction, Form factor (quantum field theory), Alpha (ethology), Relative strength
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 α K ∗ describing the relative strength of the two contributing amplitudes to this decay through intermediate pseudoscalar or vector mesons was measured to be α K ∗ =−0.36±0.06stat±0.02sys.
Published: 1999

20. Measurement of the decay KL→e+e−γγ

Author: M. Holder, I. Mannelli, R. Carosi, G.M. Pierazzini, L. Gatignon, R. Hagelberg, O. Perdereau, A. Bigi, M. Calvetti, Ken Peach, R. Werthenbach, Arthur Schaffer, D. Coward, D.C. Cundy, A. Kreutz, B. Renk, A. Beisser, Daniel Fournier, H. G. Sander, J. Scheidt, G.D. Barr, R. Fantechi, H. Rohrer, H. Blümer, Konrad Kleinknecht, P. Buchholz, E. Augé, Paolo Calafiura, M.G. Setzu, R. Casali, F. Leber, F. Scheerer, A. Wagner, A. Nappi, N. Doble, P. Grafström, Laurent Serin, J. Staeck, Lydia Iconomidou-Fayard, L. Bertanza, V.M. Marzulli, H. D. Wahl, and T. Beier
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Branching fraction, Full data
Abstract: The full data set of the NA31 experiment at CERN has been used to analyse the decay mode KOL → 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.
Published: 1998

21. Search for the decay KL → 3γ

Author: R. Heinz, Laurent Serin, I. Mannelli, M. Rost, J. Staeck, A. Kreutz, R. Hagelberg, J. Scheidt, H. G. Sander, F. Leber, B. Renk, H. Blümer, Ken Peach, N. Doble, D.C. Cundy, G.D. Barr, Konrad Kleinknecht, V.M. Marzulli, Paolo Calafiura, M. Holder, E. Augé, R. Carosi, R. Casali, F. Scheerer, Daniel Fournier, H. Rohrer, G.M. Pierazzini, Peter Buchholz, M. Calvetti, T. Beier, P. Grafström, O. Perdereau, Arthur Schaffer, D. Coward, R. Werthenbach, C. Cerri, L. Gatignon, H. D. Wahl, A. Nappi, A. Wagner, Lydia Iconomidou-Fayard, and L. Bertanza
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Distribution (mathematics), Branching fraction
Abstract: Data from the NA31 experiment at the CERN SPS have been used for the first search for the decay mode KL → 3γ. Seven events have been found with an estimated background of 6.7 ± 1.5 events. The corresponding upper limit for the branching ratio is Γ(K L → 3γ) Γ(K L → all ) = 2.4 × 10 −7 at the 90% confidence level, assuming a phase-space decay distribution.
Published: 1995

22. A test of chiral perturbation theory from the measurement of the decay KS → γγ

Author: H. G. Sander, A. Nappi, M. Calvetti, M. Rost, P. Grafström, O. Perdereau, Arthur Schaffer, D.C. Cundy, D. Coward, J. Scheidt, A. Kreutz, M. Punturo, Paolo Calafiura, V.M. Marzulli, A. Wagner, I. Mannelli, C. Cerri, T. Beier, R. Hagelberg, F. Leber, M. Holder, G.M. Pierazzini, R. Carosi, H. D. Wahl, Lydia Iconomidou-Fayard, R. Casali, Peter Buchholz, L. Gatignon, B. Renk, G.D. Barr, L. Bertanza, F. Scheerer, N. Doble, Konrad Kleinknecht, Ken Peach, Daniel Fournier, E. Augé, H. Blümer, R. Werthenbach, Laurent Serin, and J. Staeck
Subjects: Physics, Nuclear physics, Systematic error, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, Branching fraction
Abstract: Data from NA31 experiment at CERN have been used to measure the decay KS → γγ. From 69 candidate events of the type K0 → γγ, 52 events can be attributed to KL → γγ and one event is expected from background processes. The ratio of the relative decay widths R = Γ(KS → γγ)Γ(KL → γγ) is measured to be R = 2.2 ± 1.0(stat.) ± 0.3(syst.) ± 0.2(ext.) where the external systematic error is due to the experimental uncertainty in the branching ratio of the decay KL → γγ. This translates into a branching ratio of BR(KS → γγ) = (2.2 ± 1.1) × 10−6. If these data are combined with the published data from an earlier data taking period with the same experiment, the ratio R is determined to be R = 2.35 ± 0.75(stat.) ± 0.4(syst.) + 7.5 · (1 − BR(KL → γγ)5.86 × 10−4) where the last term accounts for the dependence on the measured KL → γγ branching ratio. The corresponding branching ratio for KS → γγ is BR(KS → γγ) = (2.4 ± 0.9) × 10−6. The measurement is a sensitive test of chiral perturbation theory and in good agreement with theoretical predictions.
Published: 1995

23. Performance of an electromagnetic liquid krypton calorimeter

Author: D. Schiuma, G. Viehhauser, W. Seidl, D. Schinzel, G. Linser, C. Cerri, P. Lubrano, B. Hallgren, L. Piemontese, A. Lacourt, J. Kekelidze, A. Norton, Sandro Palestini, Benedetto Gorini, C. E. Wulz, M. Markytan, N. Doble, A. Kalinin, P. Cenci, M. Martini, G. Neuhofer, Cristina Biino, A. Gianoli, J. Duclos, D.C. Cundy, H. Taureg, D. Coward, R. Fantechi, V. Marzulli, P. Calafiura, M. Pepe, P. Debu, E. Mazzucato, A. Migliori, V. Fanti, Peter Buchholz, A. Ceccucci, A. Kreutz, E. Griesmayer, M. Pernicka, G. Laverrière, H. D. Wahl, P. Lariccia, F. Leber, B. Peyaud, G. Kesseler, I. Mannelli, G.D. Barr, L. Gatignon, A. Gonidec, T. Taurok, R. Turlay, M. Savrie, F. Laico, Y. Kozhevnikov, and T. Stemmler
Subjects: Physics, Nuclear and High Energy Physics, Large Hadron Collider, Muon, Calorimeter (particle physics), Physics::Instrumentation and Detectors, Krypton, Detector, chemistry.chemical_element, Electron, Nuclear physics, chemistry, High Energy Physics::Experiment, Detectors and Experimental Techniques, Nuclear Experiment, Instrumentation, Image resolution, Noise (radio)
Abstract: A prototype electromagnetic calorimeter containing 180 litres of liquid krypton has been tested in electron and muon beams at the CERN SPS. The main features of this detector are its active shower medium, a granularity of 2 cm with tower readout, and the use of the initial current readout technique with an effective shaping time of about 60 ns. An energy resolution for electrons of 4.1% √E[ GeV ] with a constant term of 0.4% and a noise contribution of 50 MeV has been achieved. The calorimeter has a spatial resolution of 4.5 mm √E[ GeV ] with a constant term of 0.3 mm and a time resolution of about 0.5 ns for energies larger than 10 GeV.
Published: 1994

24. The NA48 liquid krypton prototype calorimeter

Author: P. Schilly, M. Debeer, D. Schiuma, A. Kreutz, D. Schinzel, P. Wicht, I. Mannelli, A. Lacourt, H. Taureg, G. Linser, V.M. Marzulli, L. Gatignon, R. Carosi, G. Kesseler, M. Pernicka, M. Markytan, P. Debu, W. Seidl, G. Gennaro, A. Bigi, G.M. Pierazzini, G.D. Barr, C. Cerri, Anton Taurok, G. Viehhauser, P. Calafiura, D. Coward, Peter Buchholz, B. Hallgren, Niels Doble, H. D. Wahl, L. Bertanza, B. Peyaud, G. Neuhofer, C.-E. Wulz, D. Bederede, D.C. Cundy, M. Mast, R. Casali, B. Gorini, F. Sergiampietri, R. Fantechi, G. Laverrière, A. Gonidec, and E. Griesmayer
Subjects: Physics, Nuclear and High Energy Physics, Calorimeter (particle physics), Physics::Instrumentation and Detectors, Krypton, Resolution (electron density), NA48 experiment, chemistry.chemical_element, Nuclear physics, chemistry, Homogeneous, Cathode ray, CP violation, High Energy Physics::Experiment, Instrumentation, Energy (signal processing)
Abstract: The NA48 experiment for a precision measurement of the CP violation parameter ϵ′ ϵ in K 0 → 2 π decays will require a fast electromagnetic calorimeter with excellent energy and time resolution. A quasi homogeneous calorimeter using liquid krypton and a fast readout with 40 MHz FADCs is proposed. A prototype with 400 kg of liquid krypton was built and tested in an electron beam. Results for the energy, space and time resolution of this prototype are given.
Published: 1992

25. A measurement of the decay KL→π0γγ

Author: I. Mannelli, B. Panzer, M. Rost, Konrad Kleinknecht, M. Holder, H.H. Nelson, O. Perdereau, Arthur Schaffer, R. Hagelberg, R. Carosi, A. Wagner, Laurent Serin, B. Renk, I. Harrus, P. Grafström, G.D. Barr, Lydia Iconomidou-Fayard, L. Bertanza, R. Werthenbach, A. Kreutz, V.M. Marzulli, H. D. Wahl, D.C. Cundy, M. Calvetti, R. Casali, P. Mayer, R. Heinz, A. Nappi, Niels Doble, G.M. Pierazzini, Peter Buchholz, H. Blümer, A. Bigi, L. Gatignon, D. Coward, E. Auge, Paolo Calafiura, Ken Peach, Daniel Fournier, and H. Rohrer
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Chiral perturbation theory, Meson, 010308 nuclear & particles physics, Branching fraction, Elementary particle, 7. Clean energy, 01 natural sciences, Nuclear physics, Particle decay, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, 010306 general physics, Boson
Abstract: The full data set of the experiment NA31 at CERN has been used to analyse the decay mode KL→π0γγ. A signal of 63 events has been observed with an estimated background of 6.0±1.7 events, corresponding to a branching ratio of (1.7±0.3)×10−6 consistent with our previous result based on partial statistics. The invariant mass spectrum of the two photons is found to be consistent with chiral perturbation theory, and the decay is dominated by the J = 0 two photon state.
Published: 1992

26. Observation of the decay KLO→ e+e−ep+e−

Author: B. Renk, H. D. Wahl, B. Panzer, V. Gibson, M. Calvetti, J. van der Lans, G. Zech, A. Bigi, D.C. Cundy, D. Coward, I. Mannelli, G.M. Pierazzini, D. J. Candlin, M. Holder, M. Rost, A. Kreutz, R. Heinz, L. Gatignon, R. Casali, H.G. Sander, H.N. Nelson, R. Carosi, G.D. Barr, O. Perdereau, Paolo Calafiura, Arthur Schaffer, Niels Doble, G. Grafström, R. Hagelberg, C. Cerri, P. Mayer, Lydia Iconomidou-Fayard, G. Quast, L. Bertanza, A. Wagner, Ken Peach, Ph. Heusse, Daniel Fournier, H. Rohrer, A. Nappi, E. Augé, Konrad Kleinknecht, H. Blümer, R. Werthenbach, I. Harrus, Laurent Serin, and R. Fantachi
Subjects: Physics, Nuclear and High Energy Physics, Branching fraction, Theoretical models, Atomic physics
Abstract: Two events with the characteristic of the decay K L O → e + e − e − have been observed with a negligible expected background from which a branching ratio of (4±3)×10 −8 is derived. This result is consistent with values estimated from theoretical models based on the double internal conventional of the decay K L O → γγ .
Published: 1991

27. Measurement of the rate of the decay KL→e+e−γ and observation of a form factor in this decay

Author: H. D. Wahl, P. Calafiura, R. Heinz, Ken Peach, R. Hagelberg, H.G. Sander, I. Harrus, V. Gibson, R.L. Chase, H. Blümer, R. Fantechi, Daniel Fournier, H. Rohrer, R. Black, Arthur Schaffer, B. Panzer, A. Kreutz, Konrad Kleinknecht, L. Gatignon, C. Cerri, I. Mannelli, W. Weihs, G.D. Barr, H.N. Nelson, N. Doble, P. Grafström, M. Calvetti, M. Rost, R. Casali, A. Bigi, B. Renk, R. Werthenbach, D. Coward, J. van der Lans, G. Zech, G. Kesseler, R. Carosi, G.M. Pierazzini, Lydia Iconomidou-Fayard, D.C. Cundy, J. Muir, D. J. Candlin, P. Mayer, M. Holder, Ph. Heusse, H. Burkhardt, E. Augé, G. Quast, and A. Nappi
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Photon, Meson, Branching fraction, Propagator, High Energy Physics::Experiment, Large sample
Abstract: A large sample of Dalitz decays, K L → e + e − γ , has been observed. The branching ratio is Γ(K L →e + e − γ) Γ(K L → all )=(9.2±0.5±0.5)×10 −6 in good agreement with theoretical predictions. We observe an enhancement at high masses in the distribution of the invariant electron-positron pair mass, compared to the distribution expected from QED. This excess is interpreted as being due to virtual mesons contributing to the photon propagator.
Published: 1990

28. The NA31 ϵ'/ϵ measurement

Author: Arthur Schaffer, W. Weihs, L. Bertanza, Konrad Kleinknecht, Ken Peach, Daniel Fournier, H. Rohrer, Lydia Iconomidou-Fayard, R. Heinz, L. Gatignon, J. Muir, G.M. Pierazzini, H.G. Sander, R. Chase, D. J. Candlin, G. Kesseler, B. Renk, S. Galeotti, H.N. Nelson, V. Gibson, C. Cerri, H. Burkhardt, E. Auge, R. Black, H. Blümer, I. Harrus, A. Kreutz, I. Mannelli, J. van der Lans, G. Zech, D.C. Cundy, G. Gargani, P. Mayer, H. D. Wahl, Ph. Heusse, Peter Clarke, R. Werthenbach, R. Fantecho, A. Bigi, G. Quast, A. Nappi, D. Coward, R. Casali, Clemens Becker, Paolo Calafiura, N. Doble, Milene Calvetti, B. Panzer, P. Grafström, G.D. Barr, R. Hagelberg, M. Rost, M. Holder, and R. Carosi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, CP violation, Atomic and Molecular Physics, and Optics
Published: 1990

29. Non-factorization of the semi-inclusive neutrino-proton cross section

Author: Christoph Geich-Gimbel, H. H. Seyfert, R. H. Giles, W. Wittek, B. Saitta, K. L. Wernhard, Richard Batley, D. R. O. Morrison, Ch. Peyrou, J. Blietschau, B. Nellen, D. Lanske, W. G. Scott, M. Aderholz, P. B. Renton, R. Pech, P. Allen, D. Radojicic, A. Grant, H. Grässler, P. O. Hulth, H. Saarikko, Reinhard W. Schulte, H. Wachsmuth, G. Myatt, P. Bosetti, T. P. Kokott, Donald H. Perkins, E. Simopoulou, D.C. Cundy, N. Schmitz, Luc Pape, P. Grossmann, and R. Settles
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Proton, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Hadron, Perturbative QCD, Nuclear physics, Cross section (physics), Bubble chamber, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Charged current
Abstract: In a neutrino-proton experiment performed with the bubble chamber BEBC, which was exposed to the wide-band neutrino beam of the CERN SPS, the semi-inclusive reaction ν p→ μ − h ± + X is studied where h ± is a hadron of a chosen type. Non-factorization of the semi-inclusive cross section is investigated in terms of double moments with respect to Bjorken- x and the energy fraction z and comparisons are made with predictions of perturbative QCD in next-to-leading order.
Published: 1980

30. Analysis of nucleon structure functions in CERN bubble chamber neutrino experiments

Author: K. L. Wernhard, V. Baruzzi, H. Grässler, F. J. Hasert, P. Porth, K. J. Powell, P. Renton, W. Meincke, E. Pagiola, Th. Kokott, P. Grossmann, R. McGow, P. C. Bosetti, Ch. Peyrou, I. Butterworth, H. Emans, R. Pech, R. Pons, R. Hartmann, R. Beuselinck, B. Nellen, H. Deden, J. Figiel, B. Saitta, A. Keller, M. Deutschmann, Ch Geich-Gimbel, H. Wachsmuth, D. Vignaud, E. F. Clayton, K. Schultze, D. H. Perkins, A. Grant, M. Bloch, K. Böckmann, Y. Sacquin, P. O. Hulth, D. B. Miller, Luc Pape, J. Morfin, J. H. Mulvey, P. Fritze, W. Hart, G. Myatt, R. Schulte, B. Tallini, M. De Beer, D. R. O. Morrison, Peter Schmid, D. Haidt, C. L. Davis, Sanjoy Banerjee, W. G. Scott, D. Radojicic, H. Seyfert, D.C. Cundy, D. J. Kocher, and Keith W. J. Barnham
Subjects: Quark, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Muon, High Energy Physics::Phenomenology, Hadron, Gluon, Baryon, Nuclear physics, Gargamelle, High Energy Physics::Experiment, Nuclear Experiment, Nucleon
Abstract: We present results for the differential cross sections of neutrinos and antineutrinos on nucleons in the energy range E = 2−200 GeV, from the BEBC and Gargamelle experiments. The structure functions F2, 2χF1 and χF3 have been evaluated as a function of χ and q2. Deviations are observed from Bjorken scaling, which are very similar to those found in electron and muon inelastic scattering. For the Callan-Gross ratio, we find 2χF 1 F 2 = 0.80 ± 0.12 and the corresponding value for 〈R〉 = 〈 σ S σ T 〉 = 0.15 ± 0.10 . Our results are consistent with the Gross-Llewellyn-Smith sum rule; we measure ⩾2.5 ± 0.5 valence quarks per nucleon. Quark and antiquark distributions are given. The Nachtmann moments of F2 and χF3 are quantitatively consistent with the predictions from QCD. The value of the strong interaction parameter is λ = 0.74 ± 0.05 GeV without corrections, and 0.66 ± 0.05 GeV including αS2 corrections. The moments of the gluon distribution are found to be positive and indicate an χ distribution of gluons which is comparable with that of the valence quarks.
Published: 1978

31. Observation of muon-neutrino reactions producing a positron and a strange particle

Author: M. Pohl, H. Deden, A. Pullia, T.W. Jones, H. Wachsmuth, F.J. Hasert, L. Jauneau, U. Nguyen-Khac, D. Lanske, I. Danilchenko, J.B.M. Pattison, A.M. Lutz, M. Jaffre, C. Pascaud, M. Haguenauer, E. Fiorini, C. Matteuzzi, G. Myatt, A. Blondel, M. Rollier, D. Blum, J. Morfin, W. Van Doninck, P. Van Dam, D. Pittuck, K. Myklebost, J. Sacton, W. Krenz, D.H. Perkins, T. Francois, J.P. Vialle, G. Bertrand-Coremans, E. Bellotti, Ph. Heusse, V. Brisson, S. Bonetti, A. Lloret, D. Cavalli, P. Musset, B. Degrange, L. Kluberg, F.W. Bullock, L. Welch, H. Mulkens, H. Weerts, F. Romano, B. Aubert, P. Petiau, A. Aldrovandi, A. Rousset, C. Longuemare, D.C. Cundy, D. Haidt, A.G. Michette, L.M. Chounet, J. Blietschau, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Starita, Sabine
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Strange quark, Large Hadron Collider, Muon, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, 01 natural sciences, Nuclear physics, Gargamelle, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Bubble chamber, High Energy Physics::Experiment, Muon neutrino, Nuclear Experiment, 010306 general physics, Event (particle physics), Particle Physics - Experiment, Particle Physics - Phenomenology, Lepton
Abstract: In addition to one previously reported event, a second event, in which a positron is observed together with a strange particle and a negative muon, has been seen in the bubble chamber Gargamelle exposed to the CERN neutrino beam. The level of the background for this type of event is found to be very low. The data strongly indicate the existence of a new type of interaction leading to a charged lepton pair correlated with a strange particle in the final state. The interpretation of these two events in terms of production of a charmed hadron is presented.
Published: 1976

32. Cross sections for neutrino and antineutrino neutral current interactions

Author: V. Stenger, P. Grossmann, H. Klein, R. McGow, D.C. Cundy, R. Pech, E. Pagiola, P. Porth, M. Deutschmann, R. Pons, I. Butterworth, Christoph Geich-Gimbel, J. H. Mulvey, E. F. Clayton, D. B. Miller, V. Peterson, K. Böckmann, P. Renton, R. Hartmann, G. Myatt, Y. Sacquin, A. Grant, B. Tallini, P. O. Hulth, H. Grässler, D. Radojicic, Ch. Peyrou, K. J. Powell, M. Bloch, B. Saitta, J. Figiel, H. Seyfert, R. Beuselinck, R. Schulte, H. Wachsmuth, H. Deden, D. Haidt, C. L. Davis, G. T. Jones, S. Banerjee, H. Emasn, W. G. Scott, D. J. Kocher, Keith W. J. Barnham, M. De Beer, Luc Pape, J. Morfin, D. H. Perkins, K. L. Wernhard, V. Baruzzi, P. C. Bosetti, W. Meincke, D. Vignaud, K. Schultze, B. Nellen, A. Keller, F. J. Hasert, T. P. Kokott, P. Fritze, W. Hart, D. R. O. Morrison, and Peter Schmid
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Neutral current, High Energy Physics::Phenomenology, Quark model, Hadron, Parton, Elementary particle, Spectral line, Nuclear physics, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Charged current
Abstract: The cross sections for ν and ν neutral current interactions for which the hadron energy is >15 GeV have been measured. These results, and the ratios of neutral current to charged current cross sections, are in agreement with the Weinberg-Salam model. Values of sin 2 θ W have been obtained both with and without the use of a parameterisation for the hadronic part of the interaction; the values are in good agreement with each other and the preferred result, that obtained by the method independent of hadronic models, is sin 2 θ W = 0.22 ± 0.05.
Published: 1978

33. Total cross sections νμ and ḡnμcharged-current interactions between 20 and 200 GeV

Author: M. M. Mobayyen, B. Wünsch, H. Deden, E. Pagiola, Ch. Peyrou, Luc Pape, H. Wachsmuth, Th. Kokott, H. Klein, A. Vayaki, D. R. O. Morrison, I. Butterworth, A. Petrides, D.C. Cundy, F.J. Hasert, E. Simopoulou, K. Böckmann, P. O. Hulth, W. G. Scott, H. Grässler, P. Bosetti, Keith W. J. Barnham, B. Nellen, C. Penfold, Donald H. Perkins, A. Grant, P. Fritze, Daniel Vignaud, K. J. Powell, D. B. Miller, Reinhard W. Schulte, C. Albajar, G. Iaselli, B. Saitta, B. Tallini, J. Velasco, T. Bolognese, and D. Radojicic
Subjects: Physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, Muon, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Elementary particle, Nuclear physics, Antimatter, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Nucleon, Big European Bubble Chamber, Lepton
Abstract: Exposures of the Ne/H 2 filled Big European Bubble Chamber (BEBC) to a dichromatic neutrino (antineutrino) beam produced by 400 GeV protons of the CERN SPS yielded ∼ 3100 events with a negative, and ∼ 1100 with a positive, muon. The neutrino flux is determined from the muon flux in the shielding. Assuming a linear energy dependence of the cross section, the values σ E between 20 and 200 GeV are found to be 0.657 ± 0.012 (stat.) ± 0.027 (syst.) and 0.309 ± 0.009 (stat.) ± 0.013 (syst.) cm 2 (GeV nucleon) −1 , for neutrinos and antineutrinos, respectively. The scaling variable q 2 E decreases significantly with increasing energy both for neutrinos and antineutrinos.
Published: 1982

34. Total cross sections for charged-current neutrino and antineutrino interactions in BEBC in the energy range 20–200 GeV

Author: P. Porth, H. Emans, D. J. Kocher, Keith W. J. Barnham, H. Weerts, K. Böckmann, F. J. Hasert, R. Beuselinck, P. Grossmann, D. Radojicic, T. P. Kokott, R. McGow, D. Haidt, J. Figiel, C. L. Davis, H. Wachsmuth, D. B. Miller, P. Renton, E. J. W. West, W. M. Allison, A. Grant, M. Bloch, I. Butterworth, V. Peterson, Christoph Geich-Gimbel, H. Grässler, E. Pagiola, G. Myatt, Luc Pape, J. Morfin, Ch. Peyrou, P. O. Hulth, P. Fritze, W. Hart, E. F. Clayton, K. J. Powell, M. Debeer, R. Schulte, R. Hartmann, D. H. Perkins, H. Deden, K. L. Wernhard, P. Schmitz, R. Pons, W. Meincke, S. Banerjee, J. Sacquin, D. R. O. Morrison, Peter Schmid, P. C. Bosetti, B. Tallini, J. H. Mulvey, R. Pech, M. Deutschmann, B. Nellen, A. Keller, D. Vignaud, K. Schultze, D.C. Cundy, B. Saitta, and H. Seyfert
Subjects: Quark, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Muon, High Energy Physics::Phenomenology, Inelastic scattering, Nuclear physics, Gargamelle, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Nucleon, Charged current
Abstract: The charged-current cross sections for neutrinos and antineutrinos on nucleons in the energy range 20–200 GeV are given. Taken in conjunction with the previous Gargamelle results, they show that σ E is almost constant with energy for antineutrinos, and falls with energy for neutrinos. The value of 〈q 2 〉 E decreases with energy for both neutrinos and antineutrinos, and these deviations from exact Bjorken scaling are consistent with those observed in electron and muon inelastic scattering. We find no evidence for new heavy quark states with right-handed coupling.
Published: 1977

35. Determination of the quark density ratio in the proton

Author: Christoph Geich-Gimbel, E. Simopoulou, D. Lanske, P. B. Renton, D.C. Cundy, H. Saarikko, W. Wittek, V. T. Cocconi, P. Allen, B. Saitta, D. Radojicic, R. H. Giles, P. Grossmann, B. Nellen, M. Aderholz, W. G. Scott, K. Böckmann, R. Settles, D. R. O. Morrison, H. Wachsmuth, R. Pech, Peter Schmid, Luc Pape, G. Myatt, N. Schmitz, H. Grässler, P. Bosetti, T. P. Kokott, Donald H. Perkins, Reinhard W. Schulte, P. O. Hulth, K. L. Wernhard, Richard Batley, Ch. Peyrou, and A. Grant
Subjects: Quark, Physics, Nuclear and High Energy Physics, Proton, Hydrogen, Scattering, chemistry.chemical_element, Function (mathematics), Nuclear physics, chemistry, Yield (chemistry), Physics::Accelerator Physics, Density ratio, Atomic physics, Charged current
Abstract: Data from an exposure of BEBC filled with hydrogen to a wideband neutrino beam are analysed to yield the structure function F v p 2 ( x ) for x > 0.2. Using our results in combination with data from electron-proton and muon-proton scattering, the quark density ratio d/u is determined as a function of x . The dominance u at large x is clearly seen. The results are compared with theoretical predictions.
Published: 1981

36. Analysis of fragmentation functions of narrow band ν and interactions on an isoscalar target

Author: Luc Pape, J.S. Chima, B. Nellen, A. Vayaki, W. Glimpf, D. B. Miller, P. O. Hulth, G. Myatt, H. Deden, A. Petridis, F. H. Hasert, J. Morfin, H. Grässler, G. T. Jones, H. Saarikko, I. Butterworth, W. G. Scott, Reinhard W. Schulte, R. H. Giles, E. Simopoulou, K. Böckmann, Daniel Vignaud, P. Bosetti, T. P. Kokott, J. R. Batley, D. Radojicic, Donald H. Perkins, B. Wünsch, M. M. Mobayyen, B. Saitta, C. Albajar, T. Bolognese, A. Grant, Keith W. J. Barnham, E. F. Clayton, Ch. Peyrou, B. Tallini, J. Velasco, M.E. Mermikides, D.C. Cundy, P. Fritze, J. L. Lloyd, H. Wachsmuth, and C. Penfold
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Narrow band, Fragmentation (mass spectrometry), Isoscalar
Published: 1982

37. Determination of the neutral to charged current inclusive cross-section ratio for v and interactions in the 'Gargamelle' experiment

Author: J. Sacton, D.C. Cundy, M. Dewit, F.J. Hasert, D. Waldren, J. Blietschau, T.W. Jones, U. Nguyen-Khac, L. Kluberg, H. Weerts, D. Cavalli, D. Lanske, M. Pohl, H. Wachsmuth, C. Pascaud, M. Jaffre, A.M. Lutz, M. Rollier, K. Myklebost, C. Longuemare, K. Schultze, E. Fiorini, J. Morfin, D. Haidt, F.W. Bullock, A.G. Michette, L. Welch, G. Bertrand-Coremans, A. Pullia, Ph. Heusse, L. Jauneau, P. Jobin, A. Aldrovandi, V. Brisson, S. Bonetti, D. Blum, B. Aubert, P. Petiau, L.M. Chounet, W. Van Doninck, B. Degrange, B. Pattison, M. Haguenauer, J.P. Vialle, P. Musset, H. Deden, G. Myatt, W. Krenz, H. Mulkens, F. Romano, and E. Bellotti
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Antiparticle, Muon, Antimatter, Gargamelle, Elementary particle, Charged current, Lepton
Published: 1977

38. Search for the decay KL→π0e+e−

Author: Ken Peach, G.D. Barr, Lydia Iconomidou-Fayard, H.N. Nelson, G. Kesseler, Ian Shipsey, H. Burkhardt, B. Pijlgroms, Daniel Fournier, W. Weihs, H. Rohrer, Konrad Kleinknecht, H. Blümer, H. D. Wahl, B. Panzer, W. Stephenson, Arthur Schaffer, M. Kasemann, P. Mayer, N. Doble, A. M. Lutz, A. Bigi, I. Mannelli, R. Hagelberg, L. Bertanza, M. Holder, Ph. Heusse, V. Gibson, H. G. Sander, Peter Clarke, C. Cerri, J. van der Lans, G. Zech, J. Steinberger, B. Renk, J. Muir, E. Augé, D. J. Candlin, G. M. Pierazzini, R.L. Chase, H. Taureg, T. Miczaika, R. Casali, C. Youngman, G. Quast, M. Corti, D. Coward, A. Nappi, R. Heinz, R. Carosi, D.C. Cundy, P. Calafiura, M. Calvetti, M. Rost, R. Black, L. Gatignon, and I. Harrus
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Large Hadron Collider, Event (relativity), Limit (mathematics)
Abstract: A search for the decay KL→π0e+e− has been performed at the CERN SPS. One candidate event has been found, compatible with an expected background of 1.5 events. The corresponding upper limit for the branching ration is Γ(KL→π0e+e−)Γ(KL → all)
Published: 1988

39. Observation of charmed baryon production in νp interactions in BEBC

Author: D. Lanske, N. Schmitz, P. B. Renton, H. Saarikko, B. Saitta, Reinhard W. Schulte, P. O. Hulth, Christoph Geich-Gimbel, V. T. Cocconi, D. Radojicic, P. Grossmann, R. Settles, B. Nellen, Luc Pape, R. Pech, H. Grässler, M. Aderholz, G. Myatt, W. Wittek, D. R. O. Morrison, R. H. Giles, P. Bosetti, Peter Schmid, T. P. Kokott, H. Wachsmuth, Donald H. Perkins, H. Klein, E. Simopoulou, D.C. Cundy, K. Böckmann, W. G. Scott, K. L. Wernhard, Ch. Peyrou, A. Grant, H. H. Seyfert, and Richard Batley
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, Hydrogen, chemistry.chemical_element, Nuclear physics, Baryon, chemistry, Production (computer science), Neutrino, Event (particle physics), Particle Physics - Experiment, Charged current
Abstract: Two examples of charmed baryon production by neutrinos have been observed in BEBC filled with hydrogen. Both events fit uniquely the reaction ν p → μ − pK − π + π + and thus apparently violate the ΔS = ΔQ rule. None of the appropriate mass combinations is consistent with the mass values of the D 0 and D + mesons. However, for the mass combinations of the pK − π + systems, values of (2.285 ± 0.005) GeV and (2.280 ± 0.003) GeV are found for event 1 and 2, respectively. These values agree with the mass of (2.285 ± 0.006) GeV for the Λ c + charmed baryon determined recently in e + e − collisions at SLAC.
Published: 1981

40. A study of the semi-leptonic decays of K+ mesons

Author: D. Bertrand, F. Romano, M. Cornelssen, S. Natali, D.C. Cundy, T.I. Pedersen, O. Erriquez, Pierre Vilain, M. Csejthey-Barth, Jacques Lemonne, P. B. Renton, H.U. Martyn, D. Waldren, and H. Braun
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Monte Carlo method, Physique des particules élémentaires, Dalitz plot
Abstract: The form factors of the semi-leptonic decays K+→π0e+ν and K+→π0μ+ν have been investigated using a sample of events detected in the CERN 1.1 m3 heavy liquid bubble chamber. Analyses have been carried out using methods independent of any assumption of the q2 dependence of the form factors in addition to the usual linear parametrizations. Consistent results have been obtained from separate studies of both Dalitz plot density distributions and the branching ratio. A parametrized global analysis of both decay modes gives the values ξ(0) = -1.3 ± 0.7 and ξ(4.4 Mπ2) = -0.45 ± 0.13, or λ0 = - 0.017 ± 0.011 both for a fitted value of λ+ = 0.025 ± 0.007. © 1975., 0, SCOPUS: ar.j, info:eu-repo/semantics/published
Published: 1975

41. Production of charmed mesons in neutrino interactions in hydrogen

Author: H. H. Seyfert, A. Grant, P. Bosetti, T. P. Kokott, Donald H. Perkins, D. R. O. Morrison, H. Wachsmuth, J. Blietschau, Peter Schmid, R. Pech, A. Vayaki, Ch. Peyrou, B. Nellen, V. T. Cocconi, M. Aderholz, H. G. Heilmann, H. Grässler, D. Haidt, W. Wittek, D. Lanske, B. Saitta, J. von Krogh, P. Checchia, G. Myatt, P. O. Hulth, H. Saarikko, Christoph Geich-Gimbel, Reinhard W. Schulte, P. Cartwright, R. H. Giles, W. G. Scott, E. Simopoulou, Luc Pape, D. Radojicic, D.C. Cundy, E. A. De Wolf, P. Grossmann, R. McGow, N. Schmitz, K. L. Wernhard, B. Conforto, W. Krenz, R. Settles, P. B. Renton, and K. Böckmann
Subjects: Physics, Quark, Nuclear physics, Nuclear and High Energy Physics, Strange quark, Particle physics, Pion, Valence (chemistry), Effective mass (solid-state physics), Meson, Neutrino, Particle Physics - Experiment, Charged current
Abstract: Production of charmed mesons has been observed in neutrino-hydrogen interactions in 285 000 photographs of BEBC exposed to the CERN wide-band neutrino beam. In ∼ 6000 charged current events, two events have been found each giving a three-constraint kinematical fit with production of only one strange particle, namely a K−, which is identified by its characteristic reaction K−p→Σ−π+. These events are thus examples of ΔS=−ΔQ reactions corresponding to charm production on a valence quark. For both events the effective mass of a (K− + pions) system is equal to the D0(1863) mass while the effective mass of this system plus a π+ is equal to the D∗+(2009) mass. The mass difference ΔM=M( D ∗+ )−M D 0 is 145.2 ± 0.6 MeV. The first event is interpreted as ν p →μ − pD ∗+ and the second as ν p →μ − pD ∗+ π + π − , both with D ∗+ → D 0 π + . The rate of inclusive D∗+ production has been estimated for all events by assuming that each negative track in turn is a K− and using the fact that the error on ΔM is small. It is found that the cross section σ(ν p →μ − D ∗+ + anything ) relative to σ(νp→μ− + anything), above the D∗ threshold, is (4.1 ± 2.4)%.
Published: 1979

42. First evidence for direct CP violation

Author: W. Weihs, H. G. Sander, Ken Peach, R.L. Chase, H. Burkhardt, W. Stephenson, G. Dietrich, B. Pijlgroms, Daniel Fournier, M. Corti, R. Carosi, D.C. Cundy, D. Coward, E. Massa, Clemens Becker, J. Muir, Ian Shipsey, D. J. Candlin, J. Steinberger, B. Panzer, Konrad Kleinknecht, G. M. Pierazzini, D. Heyland, A. M. Lutz, G. Kesseler, N. Doble, H. Blümer, A. Bigi, I. Mannelli, Lydia Iconomidou-Fayard, R. Casali, C. Cerri, W. Heinen, Arthur Schaffer, M. Holder, Ph. Heusse, Peter Clarke, M. Kasemann, C. Youngman, G. Gargani, R. Hagelberg, G. Quast, E. Augé, J. van der Lans, G. Zech, A. Nappi, H. Taureg, M. Calvetti, M. Rost, H. D. Wahl, L. Gatignon, R. Black, T. Miczaika, B. Renk, V. Gibson, Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), NA31, and Starita, Sabine
Subjects: Quark, Physics, Particle physics, Nuclear and High Energy Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], 010308 nuclear & particles physics, Branching fraction, Nuclear Theory, 01 natural sciences, 010305 fluids & plasmas, Nuclear physics, Transition radiation detector, Amplitude, Pion, Isospin, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], CP violation, High Energy Physics::Experiment, 010306 general physics, Phenomenology (particle physics), Particle Physics - Experiment
Abstract: Since CP violation was first observed in the decay of the long-lived neutral kaon into two pions [1], it remains one of the enigmas in particle physics. Whilst CP violation is manifest in neutral kaon decays, the search for CP-violating effects has elsewhere been unsuccessful. In the phenomenology of CP violation in the neutral kaon system [2], the short- and long-lived mass eigenstates are usually defined in terms of the CP eigenstates K1 (CP = + 1) and K2 (CP = - 1) as Ks ≈ K1 + ?K2 and KL ≈ K2 + ?K1. The parameter ? describes CP violation induced by kaon state-mixing. Direct CP violation may also occur in the decay of K2 into two pions with a relative amplitude ?′, which is non-zero in the case of a phase difference between the amplitudes A0 and A2 for the decay into isospin O and 2 states of two pions. Before the present measurement, all experimental results were compatible with ? = 2.27 × 10-3 exp (i 43.70) and with the Superweak Model [3], in which state-mixing is the only source of CP violation and ?′ = 0. In the Standard Model with six weakly interacting quarks [4], direct CP violation as well as state-mixing is introduced by transitions via heavy-quark intermediate states. Based on this, a small, but non-zero, value of ?′ is predicted [5]. To a good approximation, ?′ /? is related to the double ratio R of the relative decay rates of the long- and short-lived neutral kaons into two neutral and two charged pions as Re (?′/?) = 1/6 × (1 - R).
Published: 1988
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43. Hadron production in charged current neutrino and antineutrino interactions at high energy

Author: F. J. Hasert, T. P. Kokott, R. Beuselinck, H. Seyfert, D. J. Kocher, S. J. Chima, Keith W. J. Barnham, P. Renton, M. Deutschman, K. L. Wernhard, V. Baruzzi, B. Saitta, R. Schulte, D. Haidt, C. L. Davis, W. Meincke, R. Hartmann, S. Banerjee, P. C. Bosetti, V. Stenger, Christoph Geich-Gimbel, G. Myatt, D. Vignaud, D. B. Miller, W. G. Scott, V. Peterson, D. R. O. Morrison, E. F. Clayton, K. Schultze, Luc Pape, J. Morfin, R. Künne, H. Emans, Peter Schmid, G. Heilmann, H. Deden, P. Grossmann, B. Nellen, D. H. Perkins, R. McGow, A. Keller, J. H. Mulvey, B. Tallini, P. Porth, D. Radojicic, P. Fritze, W. Hart, M. Bloch, G. T. Jones, A. Vayaki, J. Figiel, K. J. Powell, H. Wachsmuth, E. Simopoulou, H. Grässler, D.C. Cundy, Ch. Peyrou, I. Butterworth, R. Pech, A. Grant, R. Pons, Y. Sacquin, P. O. Hulth, M. De Beer, E. Pagiola, and K. Böckmann
Subjects: Physics, Quark, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Quark model, Hadron, Parton, Nuclear physics, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Nucleon, Charged current
Abstract: The general features of hadrons produced in charged current interaction of high-energy neutrinos on nucleons are shown to be basically consistent with the idea of quark fragmentation within the framework of the quark parton model. However, many of the effects observed are shown also to follow from longitudinal phase space. Evidence is presented for a rise in 〈pT2〉 with Q2 in qualitative agreement with the predictions of quantum chromodynamics (QCD).
Published: 1979

44. The structure of the weak neutral current: An analysis of the hadronic energy distribution from neutrino and antineutrino interactions

Author: D. R. O. Morrison, Peter Schmid, Luc Pape, J. Morfin, D. Radojicic, R. Hartmann, D. H. Perkins, P. Renton, B. Saitta, Christoph Geich-Gimbel, P. Porth, R. Pech, R. Pons, D. Haidt, C. L. Davis, D. B. Miller, P. Fritze, M. Deutschmann, D. J. Kocher, Keith W. J. Barnham, V. Peterson, D. Vignaud, H. Seyfert, P. Grossmann, V. Stenger, H. Emans, R. McGow, R. Schulte, B. Tallini, K. Schultze, K. J. Powell, M. Bloch, H. Deden, W. G. Scott, B. Nellen, E. F. Clayton, A. Keller, A. Grant, K. L. Wernhard, H. Grässler, V. Baruzzi, J. H. Mulvey, Ch. Peyrou, E. Pagiola, D.C. Cundy, J. Figiel, H. Wachsmuth, G. Myatt, R. Beuselinck, F. J. Hasert, T. P. Kokott, Y. Sacquin, and P. O. Hulth
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Energy distribution, Neutral current, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Hadron, Scalar (physics), Neutrino beam, Nuclear physics, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Neutrino oscillation
Abstract: An analysis is presented of the distribution of hadronic energy in neutrino and antineutrino neutral current interactions occurring in BEBC, filled with a neon-hydrogen mixture and exposed to the CERN-SPS narrow-band neutrino beam. This shows that the contributions by scalar or pseudo-scalar forms of the interaction are consistent with zero and pure V, A and V + A are excluded; there is good agreement with the Weinberg-Salam model.
Published: 1979

45. Evidence for the leptonic neutral current reaction

Author: M. Jaffre, M. Haguenauer, D. Pittuck, M. Dewitt, C. Pascaud, J. Sacton, A.M. Lutz, D. Haidt, G. Myatt, D. Lanske, D.H. Perkins, P. Musset, J. Morfin, E. Bellotti, D. Blum, A.G. Michette, W. Krenz, G. Bertrand-Coremans, E. Fiorini, K. Schultze, J.B.M. Pattison, C. Longuemare, F.J. Hasert, F.W. Bullock, L. Welch, H. Mulkens, M. Pohl, A. Pullia, M. Rollier, F. Romano, D. Cavalli, B. Aubert, H. Faissner, H. Deden, P. Petiau, U. Nguyen Khac, D.C. Cundy, M.J. Esten, I. Danilchenko, Ph. Heusse, L. Kluberg, V. Brisson, S. Bonetti, H. Weerts, W. Van Doninck, J.P. Vialle, James Pinfold, L.M. Chounet, L. Jauneau, K. Myklebost, J. Blietschau, H. Wachsmuth, B. Degrange, and T.W. Jones
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Neutral current, Gargamelle, Electron, Neutrino, Recoil electron
Abstract: In the Gargamelle neutrino experiment, three unambiguous candidates for the reaction ν μ + e − → ν μ e − have been observed corresponding to a cross section for a recoil electron energy within the range 0.3 e − GeV of 0.06 × 10 −41 E ν ( GeV ) cm 2 / electron . The calculated background is 0.44 ± 0.13 events and the probability that all three candidates could be due to this background is 1%.
Published: 1976

46. Observation of scaling deviations in the energy distribution of secondary hadrons in inelastic neutrino-proton interactions

Author: B. Nellen, M. Aderholz, E. Simopoulou, G. Myatt, D.C. Cundy, H. G. Heilmann, P. Checchia, W. Wittek, R. H. Giles, H. Saarikko, D. Lanske, W. G. Scott, P. B. Renton, H. Wachsmuth, H. H. Seyfert, Ch. Peyrou, R. Orava, H. Grässler, R. Pech, A. Vayaki, P. O. Hulth, P. Bosetti, D. Radojicic, T. P. Kokott, Christoph Geich-Gimbel, P. Grossmann, B. Saitta, Donald H. Perkins, J. Blietschau, N. Schmitz, R. McGow, K. Böckmann, R. Settles, A. Grant, Reinhard W. Schulte, W. Krenz, D. R. O. Morrison, K. L. Wernhard, L. Bacci, and Luc Pape
Subjects: Quark, Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Muon, High Energy Physics::Phenomenology, Hadron, Elementary particle, Nuclear physics, High Energy Physics::Experiment, Neutrino, Charged current, Lepton
Abstract: An analysis is presented of the z distributions of secondary hadrons produced in 5600 charged current events from a BEBC neutrino-hydrogen experiment. Evidence is presented for scaling deviations in the z distributions and a breakdown of factorization in the single particle inclusive cross sections. The results are consistent with the leading order QCD predictions on the q2 dependence of nonsinglet moments of quark fragmentation functions, yielding a value of Λ ≈ 0.6 GeV.
Published: 1979

47. Transverse momentum of hadrons produced in ν and interactions on an isoscalar target in BEBC

Author: Christoph Geich-Gimbel, A. Vayaki, H. Saarikko, M. Bloch, M. M. Mobayyen, Luc Pape, I. Butterworth, W. G. Scott, Daniel Vignaud, K. J. Powell, F.J. Hasert, M.E. Mermikides, A. Grant, Keith W. J. Barnham, J. Morfin, H. Grässler, D. B. Miller, D. Radojicic, O. Skjeggestad, P. Fritze, H. Deden, E. Simopoulou, Reinhard W. Schulte, J. L. Lloyd, P. Grossmann, K. Böckmann, D.C. Cundy, P. Bosetti, T. P. Kokott, J. R. Batley, Donald H. Perkins, J.S. Chima, B. Nellen, P. B. Renton, C. Penfold, B. Saitta, T. Bolognese, E. F. Clayton, B. Tallini, J. Velasco, R. H. Giles, P. O. Hulth, R. Pech, and G. Myatt
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Antiparticle, Muon, Isoscalar, Nuclear Theory, Hadron, Elementary particle, Fermion, Nuclear physics, Antimatter, High Energy Physics::Experiment, Nuclear Experiment, Lepton
Abstract: The average transverse momentum squared, 〈p⊥2〉, of hadrons is studied as a function of W2 and of Q2 for ν and ν interactions on an isoscalar target. An increase of 〈p⊥2〉 with W2 is observed for the hadrons emitted forward in the hadronic c.m.s. The p⊥ dependence of the fragmentation function is found to factorise from the structure function at fixed W, but does not factorise at fixed Q2. Unlike the case of forward-going particles, the 〈p⊥2〉 of hadrons going backward in the c.m.s. shows no strong dependence on W2.
Published: 1981

48. Experimental study of structure functions and sum rules in charge-changing interactions of neutrinos and antineutrinos on nucleons

Author: L. Jauneau, W. Venus, G. Myatt, W.G. Scott, A.G. Michette, D. Lanske, W. Krenz, L. Kluberg, F. J. Hasert, H. Weerts, V. Brisson, M. Haguenauer, Bernard Aubert, J.B.M. Pattison, T.W. Jones, Pierre Vilain, J. Gandsman, M. Rollier, S. Natali, P. Petiau, S. Bonetti, H. Deden, J. McKenzie, D.C. Cundy, L.M. Chounet, D.H. Perkins, D. Haidt, J. Morfin, J. von Krogh, U. Nguyen-Khac, E. Bellotti, C. Pascaud, J. Sacton, Ph. Heusse, C. Franzinetti, C. Longuemare, Donatella Cavalli, H. Wachsmuth, D. Degrange, M.J. Esten, K. Schultze, A. Rousset, C. Conta, W. Van Doninck, J.P. Vialle, F. W. Bullock, E. Fiorini, A.M. Lutz, M. Jaffre, Alberto Pullia, and G. Bertrand-Coremans
Subjects: Physics, Quark, Nuclear physics, Nuclear and High Energy Physics, Antiparticle, Particle physics, Quark model, Parton, Charge (physics), Neutrino, Nucleon, Electric charge
Published: 1975

49. Measurement of structure factors in inelastic neutrino scattering

Author: C. Franzinetti, R.B. Palmer, T. B. Novey, M. Nikolic, J.B.M. Pattison, W. B. Fretter, C. Manfredotti, H. Yoshiki, C.A. Ramm, F. A. Nezrick, D.C. Cundy, H.W.K. Hopkins, Ioulian Budagov, D.H. Perkins, W. Venus, H. Wachsmuth, G. Myatt, B. Roe, and R. Stump
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, High Energy Physics::Phenomenology, Elementary particle, Inelastic scattering, Scale invariance, Inelastic neutron scattering, Nuclear physics, Pomeron, High Energy Physics::Experiment, Neutrino, Nucleon
Abstract: Neutrino scattering cross-sections in the deep inelastic continuum have been determined and shown to exhibit the point-like behaviour, or scale invariance, previously observed in electroproduction experiments. The structure functions display the features predicted by the Pomeron exchange model for virtual W-scattering. Their magnitudes are compared with various theories.
Published: 1969

50. Observation of 'elastic' hyperon production by antineutrinos

Author: C. Franzinetti, F. Jacquet, R.G. Worthington, V. Brisson, L. Jauneau, D. Haidt, M. Haguenauer, A. Lagarrigue, D.C. Cundy, J. McKenzie, E. Bellotti, D.H. Perkins, Jacques Lemonne, S. Kabe, K. Schultze, G. Myatt, M.J. Esten, T. Eichten, S. Bonetti, A.M. Lutz, L. Kluberg, W. Van Donnick, E. Fiorini, A.G. Michette, F. W. Bullock, A. Pullia, C. Conta, H. Wachsmuth, C.A. Ramm, C. Pascaud, S. Natali, J. Morfin, J. von Krogh, Pierre Vilain, Ph. Heusse, L.M. Chounet, J.P. Vialle, B. Degrange, Jean Sacton, T.W. Jones, R.H. Schäfer, W. Frenz, P. Musset, U. Nguyen-Khac, M. Brini-Penzo, J.B.M. Pattison, B. Aubert, H. Faissner, P. Petiau, and W. Venus
Subjects: Nuclear reaction, Physics, Nuclear physics, Nuclear and High Energy Physics, Hyperon, Atomic physics
Abstract: The production of Λ and Σ0 hyperons by antineutrinos has been observed. These events have been used to estimate the production cross-section on protons. The result is compared with the predictions of the Cabibbo theory for the process ν p → μ + Λ .
Published: 1972

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