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1. Search for the decay KS → π0γγ

Author

R.S. Dosanjh, M. Wittgen, J. Cogan, M. De Beer, T.J. Gershon, H. D. Wahl, G. Govi, W. Kubischta, E. Rondio, T. Cuhadar-Dönszelmann, Peter Zahariev Hristov, Anton Taurok, K. Holtz, Rainer Wanke, B. Peyaud, C. Cheshkov, N. A. Molokanova, M. Markytan, M. Lenti, D. J. Munday, Vladimir Kekelidze, G. Graziani, G. Neuhofer, A. Nappi, Lau Gatignon, A. Tkatchev, Nadia Pastrone, J.-C. Chollet, P. F. Dalpiaz, B. Panzer-Steindel, P. Cenci, E. Iacopini, P. Grafström, R. Turlay, I.G. Knowles, Konrad Kleinknecht, V. Falaleev, S. Giudici, I. Mannelli, D.C. Cundy, M. Contalbrigo, M. Pepe, S. Wronka, Y. Schué, B. Vallage, Benedetto Gorini, D. Marras, R. Fantechi, A. Maier, M. Eppard, G. Fischer, Milene Calvetti, L. Köpke, D. Madigojine, U. Koch, Manfred Jeitler, C. Cerri, R. Carosi, A. Lai, Andrea Formica, A. Winhart, A. Peters, Nicolo Cartiglia, A. Kalter, S. A. Wotton, Michael Andrew Parker, P.L. Frabetti, Louis Fayard, Mauro Piccini, F. Marchetto, A. Norton, J. Duclos, H. Dibon, Michal Szleper, Niels Doble, E. Olaiya, I. Pellmann, G. Unal, H. Fox, G. Anzivino, P. Debu, L. Widhalm, F. Costantini, E. Mazzucato, Roberta Arcidiacono, M. Sozzi, R. Sacco, B. Renk, A. Lacourt, Augusto Ceccucci, G. Pierazzini, J. Nassalski, T. O. White, W. Wislicki, V. Schönharting, M. Pernicka, Alan W. Walker, P. Lopes da Silva, L. Masetti, Sandro Palestini, A. Gonidec, A. I. Zinchenko, Lydia Iconomidou-Fayard, M. Holder, P. Marouelli, M. Cirilli, G. Collazuol, F. Petrucci, A. Gianoli, M. Savrie, C. Lazzeroni, R. Granier de Cassagnac, Roberto Guida, R. Casali, G. Tatishvili, G. Bocquet, Yu. Potrebenikov, G. Kalmus, R. J. Batley, H.G. Becker, Cristina Biino, Ivan Mikulec, J.B. Cheze, P. Lubrano, S.A. Schmidt, Victoria Jane Martin, E. Imbergamo, Mayda Velasco, H. Taureg, Andrea Bizzeti, Michael Ziolkowski, G.D. Barr, M. Martini, J. Ocariz, I. Wingerter, Alexi Mestvirishvili, Adrian John Bevan, and E. Menichetti

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Detector, Limit (mathematics), 010306 general physics, 01 natural sciences, Beam (structure)
Abstract

A search for the decay K S → π 0 γγ has been made using the NA48 detector at the CERN SPS. Using data collected in 1999 during a 40-hour run with a high-intensity K S beam, an upper limit for the branching ratio BR ( K S → π 0 γγ , z ⩾0.2) −7 has been obtained at 90% confidence level, where z = m γγ 2 / m K 0 2 .

Published
2016

2. Precise measurement of the decay KL → π0γγ

Author

A. Lai, D. Marras, A. Bevan, R.S. Dosanjh, T.J. Gershon, B. Hay, G.E. Kalmus, C. Lazzeroni, D.J. Munday, M.D. Needham, E. Olaiya, M.A. Parker, T.O. White, S.A. Wotton, G. Barr, G. Bocquet, A. Ceccucci, T. Cuhadar-Dönszelmann, D. Cundy, G. D'Agostini, N. Doble, V. Falaleev, L. Gatignon, A. Gonidec, B. Gorini, G. Govi, P. Grafström, W. Kubischta, A. Lacourt, M. Lenti, S. Luitz, I. Mikulec, A. Norton, S. Palestini, B. Panzer-Steindel, G. Tatishvili, H. Taureg, M. Velasco, H. Wahl, C. Cheshkov, P. Hristov, V. Kekelidze, D. Madigojine, N. Molokanova, Yu. Potrebenikov, A. Zinchenko, I. Knowles, V. Martin, R. Sacco, A. Walker, M. Contalbrigo, P. Dalpiaz, J. Duclos, P.L. Frabetti, A. Gianoli, M. Martini, F. Petrucci, M. Savrié, A. Bizzeti, M. Calvetti, G. Collazuol, G. Graziani, E. Iacopini, M. Veltri, H.G. Becker, M. Eppard, H. Fox, K. Holtz, A. Kalter, K. Kleinknecht, U. Koch, L. Köpke, P. Lopes da Silva, P. Maruelli, I. Pellmann, A. Peters, B. Renk, S.A. Schmidt, V. Schönharting, Y. Schué, R. Wanke, A. Winhart, M. Wittgen, J.C. Chollet, L. Fayard, L. Iconomidou-Fayard, J. Ocariz, G. Unal, I. Wingerter-Seez, G. Anzivino, P. Cenci, E. Imbergamo, P. Lubrano, A. Mestvirishvili, A. Nappi, M. Pepe, M. Piccini, R. Carosi, R. Casali, C. Cerri, M. Cirilli, F. Costantini, R. Fantechi, S. Giudici, I. Mannelli, G. Pierazzini, M. Sozzi, J.B. Cheze, J. Cogan, M. De Beer, P. Debu, A. Formica, R. Granier de Cassagnac, E. Mazzucato, B. Peyaud, R. Turlay, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, R. Arcidiacono, C. Biino, N. Cartiglia, M. Clemencic, F. Marchetto, E. Menichetti, N. Pastrone, J. Nassalski, E. Rondio, M. Szleper, W. Wislicki, S. Wronka, H. Dibon, G. Fischer, M. Jeitler, M. Markytan, G. Neuhofer, M. Pernicka, A. Taurok, and L. Widhalm

Subjects
mesoni K, decadimenti rari, Physics, Coupling constant, Nuclear and High Energy Physics, Particle physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, Gamma gamma, Pi, High Energy Physics::Experiment, Nuclear Experiment, Astrophysics::Galaxy Astrophysics
Abstract

The decay rate of $\klpgg$ has been measured with the NA48 detector at the CERN SPS. A total of 2558 $\klpgg$ candidates have been observed with a residual background of 3.2%. The branching ratio is determined to be $(1.36 \pm0.03_{(stat)} \pm0.03_{(syst)}\pm 0.03_{(norm)})\times10^{-6}$ and the vector coupling constant $a_v = -0.46 \pm0.03_{(stat)} \pm0.04_{(syst)}$. This result suggests that the CP-violation effects are dominating in the $\klpee$ decay. An upper limit for the $\klpgg$ decay rate in the two photon mass region $m_{\gamma\gamma}

Published
2016

3. Measurement of K-e3(0) form factors

Author

S.A. Schmidt, G. Bocquet, Yu. Potrebenikov, I. Mannelli, D. Marras, E. Imbergamo, G.M. Pierazzini, Rainer Wanke, P. Debu, Michael Andrew Parker, M. Sozzi, H. Taureg, M. Ziolkowski, V. Schönharting, M. Pepe, P. Lubrano, Nadia Pastrone, G. D'Agostini, S. A. Wotton, M. Cirilli, A. Nappi, J. C. Chollet, B. Panzer-Steindel, J. Ocariz, B. Renk, P. Lopes da Silva, L. Gatignon, M. Martini, P. F. Dalpiaz, H.G. Becker, I.G. Knowles, Fabrizio Petrucci, G. Neuhofer, N. Doble, T.J. Gershon, I. Wingerter-Seez, A. Ceccucci, Ivan Mikulec, M. Pernicka, S. Giudici, Michal Szleper, S. Wronka, Andrea Bizzeti, D.C. Cundy, F. Martelli, A. Peters, Louis Fayard, Lydia Iconomidou-Fayard, P. Marouelli, F. Marchetto, Y. Schué, G. Graziani, Adrian John Bevan, H. Fox, M. Wittgen, G.D. Barr, J. Cogan, T.O. White, E. Iacopini, G. Unal, L. Widhalm, Benedetto Gorini, M. Eppard, V. Falaleev, L. Bertanza, A. Lacourt, S. Stoynev, Manfred Jeitler, Leander Litov, P. Grafström, Cristina Biino, M. Savrie, Alexi Mestvirishvili, I. Pellmann, R. Sacco, J. Duclos, G. Anzivino, Wojciech Wislicki, J.B. Cheze, Vladimir Kekelidze, G.E. Kalmus, A. Gonidec, Rodolfo Carosi, H. D. Wahl, R. Fantechi, P.L. Frabetti, G. Govi, C. Cerri, G. Collazuol, B. Peyaud, Milene Calvetti, R. Turlay, B. Hay, B. Vallage, W. Kubischta, Cristina Lazzeroni, M. Veltri, U. Koch, A. Winhart, G. Fischer, M. Markytan, M. Lenti, H. Dibon, Anton Taurok, Mauro Piccini, A. Norton, E. Menichetti, M. De Beer, Konrad Kleinknecht, Alan W. Walker, N. A. Molokanova, K. Eppard, D.J. Munday, J. Nassalski, Nicolo Cartiglia, Sandro Palestini, E. Olaiya, E. Mazzucato, A. I. Zinchenko, A. Gianoli, R. Granier de Cassagnac, Victoria Jane Martin, Mayda Velasco, E. Rondio, T. Cuhadar-Dönszelmann, R.S. Dosanjh, D. Madigojine, A. Lai, Andrea Formica, C. Cheshkov, P. Cenci, A. Kalter, Roberta Arcidiacono, R. Casali, M. Contalbrigo, F. Costantini, A. Maier, P. Hristov, L. Köpke, and M. Holder

Subjects
Physics, Semileptonic decay, Nuclear and High Energy Physics, Meson, Scalar (mathematics), Hadron, SEMI-LEPTONIC DECAYS, RADIATIVE-CORRECTIONS, TENSOR INTERACTIONS, MONTE-CARLO, KAONS, Form factor (quantum field theory), Zero (complex analysis), Dalitz plot, Weak interaction, NO, Atomic physics, Particle Physics - Experiment
Abstract

The semi-leptonic decay of the neutral K meson $K^{0}_{L} \to \pi^{\pm}e^{\mp}\nu (K_{e3})$, was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector $(f_{+}(q^{2}))$, scalar $(f_{S})$ and tensor $(f_{T})$ interactions were measured. The linear slope of the vector form factor $\lambda_{+} = 0.0284 \pm 0.0007 \pm 0.0013$ and values for the ratios $|f_{S}/f_{+}(0)|=0.015^{+0.007}_{-0.010} \pm 0.012$ and $|f_{T}/f_{+}(0)|=0.05^{+0.03}_{-0.04} \pm 0.03$ were obtained. The values for $f_{S}$ and for $f_{T}$ are consistent with zero. Assuming only vector-axial vector couplings, $\lambda_{+} = 0.02888 \pm 0.0004 \pm 0.0011$ and a good fit consistent with pure V-A couplings were obtained. Alternatively a fit to a dipole form factor yields a pole mass of $M = 859 \pm 18$ MeV, consistent with the $K^{*}(892)$ mass. The semileptonic decay of the neutral K meson, KL0→π±e∓ν ( Ke3 ), was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector (f+(q2)) , scalar ( fS ) and tensor ( fT ) interactions were measured. The linear slope of the vector form factor λ+=0.0284±0.0007±0.0013 and values for the ratios |fS/f+(0)|=0.015−0.010+0.007±0.012 and |fT/f+(0)|=0.05−0.04+0.03±0.03 were obtained. The values for fS and fT are consistent with zero. Assuming only vector–axial-vector couplings, λ+=0.0288±0.0004±0.0011 and a good fit consistent with pure V–A couplings were obtained. Alternatively, a fit to a dipole form factor yields a pole mass of M=859±18 MeV , consistent with the K*(892) mass. The semileptonic decay of the neutral K meson, KL -> pi e nu (Ke3), was used to study the strangeness-changing weak interaction of hadrons. A sample of 5.6 million reconstructed events recorded by the NA48 experiment was used to measure the Dalitz plot density. Admitting all possible Lorentz-covariant couplings, the form factors for vector (f_+(q^2)), scalar (f_S) and tensor (f_T) interactions were measured. The linear slope of the vector form factor lambda_+ = 0.0284+-0.0007+-0.0013 and values for the ratios |f_S/f_+(0)| = 0.015^{+0.007}_{-0.010}+-0.012 and |f_T/f_+(0)| = 0.05^{+0.03}_{-0.04}+-0.03 were obtained. The values for f_S and f_T are consistent with zero. Assuming only Vector-Axial vector couplings, lambda_+ = 0.0288+-0.0004+-0.0011 and a good fit consistent with pure V-A couplings were obtained. Alternatively, a fit to a dipole form factor yields a pole mass of M = 859+-18 MeV, consistent with the K^*(892) mass.

Published
2016

4. First observation of the KS → π0γ γ decay

Author

Augusto Ceccucci, E. Olaiya, M. Markytan, M. Lenti, T. Cuhadar-Dönszelmann, E. Iacopini, P. Lubrano, P. Grafström, Rainer Wanke, S.A. Schmidt, E. Mazzucato, R.S. Dosanjh, E. Imbergamo, A. Gonidec, A. Lacourt, D. Madigojine, Nadia Pastrone, P. Debu, D. Marras, M. De Beer, G. Tatishvili, R. Fantechi, B. Vallage, G. Collazuol, M. Holder, G.M. Pierazzini, K. Holtz, Milene Calvetti, J. R. Batley, I. Mannelli, Victoria Jane Martin, M. Pernicka, M. Eppard, C. Cheshkov, H. Dibon, B. Panzer-Steindel, P. Rubin, M. Sozzi, S. A. Wotton, A. Peters, J. Nassalski, A. Hirstius, Michal Szleper, J.B. Cheze, Cristina Biino, Ivan Mikulec, Roberta Arcidiacono, C. Cerri, Luca Fiorini, A. Winhart, G. Bocquet, Yu. Potrebenikov, Mauro Piccini, M. Savrie, A. I. Zinchenko, E. Menichetti, G. Marel, A. Lai, G.E. Kalmus, R. Casali, A. Gianoli, R. Granier de Cassagnac, M. Wittgen, Benedetto Gorini, Andrea Formica, I. Pellmann, Cristina Lazzeroni, N. A. Molokanova, F. Derue, Konrad Kleinknecht, Anton Taurok, M. Cirilli, Niels Doble, T.O. White, G. Graziani, V. Falaleev, Louis Fayard, F. Marchetto, R. Sacco, G. Neuhofer, Lau Gatignon, I. Wingerter-Seez, Manfred Jeitler, J. Duclos, G. Unal, Andrea Bizzeti, G. Anzivino, W. Kubischta, I. Mestvirishvili, G. Gouge, F. Costantini, H. D. Wahl, F. Martelli, D.C. Cundy, B. Peyaud, S. Wronka, Alexi Mestvirishvili, Vladimir Kekelidze, L. Widhalm, P. Cenci, Y. Schué, Fabrizio Petrucci, J. C. Chollet, A. Nappi, M. Contalbrigo, M. Martini, Michael Ziolkowski, P.L. Frabetti, U. Koch, S. Giudici, A. Maier, P. Hristov, Nicolo Cartiglia, Michael Andrew Parker, G.D. Barr, Alan W. Walker, L. Köpke, W. Wislicki, V. Schönharting, E. Rondio, P. F. Dalpiaz, M. Pepe, T.J. Gershon, D.J. Munday, P. Lopes da Silva, Lydia Iconomidou-Fayard, P. Marouelli, M. Veltri, A. Norton, and R. Turlay

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Chiral perturbation theory, Large Hadron Collider, decadimenti, 010308 nuclear & particles physics, Branching fraction, Detector, 01 natural sciences, mesoni K, Nuclear physics, 0103 physical sciences, 010306 general physics
Abstract

Using the NA48 detector at the CERN SPS, 31 KS → π 0γγ candidates with an estimated background of 13.7 ± 3.2 events have been observed. This first observation leads to a branching ratio of BR(KS → π0γγ) z>0.2 = (4.9 ± 1.6stat ± 0.9 syst) × 10-8 in agreement with Chiral Perturbation Theory predictions. © 2003 Elsevier B.V. All rights reserved.

Published
2004

5. Precise measurements of the KS → γγ and KL → γγ decay rates

Author

A Lai, D Marras, J.R Batley, R.S Dosanjh, T.J Gershon, G.E Kalmus, C Lazzeroni, D.J Munday, E Olaiya, M.A Parker, T.O White, S.A Wotton, R Arcidiacono, G Barr, G Bocquet, A Ceccucci, T Cuhadar-Dönszelmann, D Cundy, N Doble, V Falaleev, L Gatignon, A Gonidec, B Gorini, P Grafström, W Kubischta, A Lacourt, I Mikulec, A Norton, B Panzer-Steindel, G Tatishvili, H Wahl, C Cheshkov, P Hristov, V Kekelidze, D Madigojine, N Molokanova, Yu Potrebenikov, A Zinchenko, V Martin, P Rubin, R Sacco, A Walker, M Contalbrigo, P Dalpiaz, J Duclos, P.L Frabetti, A Gianoli, M Martini, F Petrucci, M Savrié, A Bizzeti, M Calvetti, G Collazuol, G Graziani, E Iacopini, M Lenti, F Martelli, M Veltri, M Eppard, A Hirstius, K Holtz, K Kleinknecht, U Koch, L Köpke, P Lopes da Silva, P Marouelli, I Mestvirishvili, I Pellmann, A Peters, S.A Schmidt, V Schönharting, Y Schué, R Wanke, A Winhart, M Wittgen, J.C Chollet, L Fayard, L Iconomidou-Fayard, G Unal, I Wingerter-Seez, G Anzivino, P Cenci, E Imbergamo, P Lubrano, A Mestvirishvili, A Nappi, M Pepe, M Piccini, R Casali, C Cerri, M Cirilli, F Costantini, R Fantechi, L Fiorini, S Giudici, I Mannelli, G Pierazzini, M Sozzi, J.B Cheze, M De Beer, P Debu, F Derue, A Formica, R Granier de Cassagnac, G Gouge, G Marel, E Mazzucato, B Peyaud, R Turlay, B Vallage, M Holder, A Maier, M Ziolkowski, C Biino, N Cartiglia, F Marchetto, E Menichetti, N Pastrone, J Nassalski, E Rondio, M Szleper, W Wislicki, S Wronka, H Dibon, M Jeitler, M Markytan, G Neuhofer, M Pernicka, A Taurok, and L Widhalm

Subjects
Physics, Particle physics, Nuclear and High Energy Physics, Chiral perturbation theory, Large Hadron Collider, Branching fraction, decadimenti, Astrophysics::High Energy Astrophysical Phenomena, Detector, Intensity (physics), Gamma gamma, Nuclear physics, mesoni K, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure)
Abstract

The KS → γγ decay rate has been measured with the NA48 detector using a high intensity short neutral beam from the CERN SPS. The measured branching ratio BR(KS → γγ) = (2.78 ± 0.06stat ± 0.04syst) x 10-6, obtained from 7461 ± 172 KS → γγ events, is significantly higher than the O(p4) prediction of chiral perturbation theory. Using a KL beam the ratio Γ(KL → γγ)/Γ(KL → π0π0π0) = (2.81 ± 0.02syst) ×10-3 has been measured. © 2002 Elsevier Science B.V. All rights reserved.

Published
2003

6. New measurements of the η and K0 masses

Author

A. Lai, D. Marras, J.R. Batley, A.J. Bevan, R.S. Dosanjh, T.J. Gershon, G.E. Kalmus, C. Lazzeroni, D.J. Munday, E. Olaiya, M.A. Parker, T.O. White, S.A. Wotton, G. Barr, G. Bocquet, A. Ceccucci, T. Cuhadar-Dönszelmann, D. Cundy, G. D'Agostini, N. Doble, V. Falaleev, W. Funk, L. Gatignon, A. Gonidec, B. Gorini, G. Govi, P. Grafström, W. Kubischta, A. Lacourt, M. Lenti, I. Mikulec, A. Norton, S. Palestini, B. Panzer-Steindel, D. Schinzel, G. Tatishvili, H. Taureg, M. Velasco, H. Wahl, C. Cheskov, P. Hristov, V. Kekelidze, D. Madigojine, N. Molokanova, Yu. Potrebenikov, A. Zinchenko, V.J. Martin, P. Rubin, R. Sacco, A. Walker, D. Bettoni, R. Calabrese, M. Contalbrigo, P. Dalpiaz, J. Duclos, P.L. Frabetti, A. Gianoli, E. Luppi, M. Martini, L. Masetti, F. Petrucci, M. Savrié, M. Scarpa, A. Bizzeti, M. Calvetti, G. Collazuol, G. Graziani, E. Iacopini, F. Martelli, M. Veltri, H.G. Becker, M. Eppard, H. Fox, A. Hirstius, K. Holtz, A. Kalter, K. Kleinknecht, U. Koch, L. Köpke, P. Lopes da Silva, P. Marouelli, I. Mestvirishvili, I. Pellmann, A. Peters, S.A. Schmidt, V. Schönharting, Y. Schué, R. Wanke, A. Winhart, M. Wittgen, J.C. Chollet, L. Fayard, L. Iconomidou-Fayard, J. Ocariz, G. Unal, I. Wingerter-Seez, G. Anzivino, P. Cenci, E. Imbergamo, G. Lamanna, P. Lubrano, A. Mestvirishvili, A. Nappi, M. Pepe, M. Piccini, R. Casali, C. Cerri, M. Cirilli, F. Costantini, R. Fantechi, L. Fiorini, S. Giudici, I. Mannelli, G. Pierazzini, M. Sozzi, J.B. Cheze, J. Cogan, M. De Beer, P. Debu, F. Derue, A. Formica, G. Gouge, R. Granier de Cassagnac, G. Marel, E. Mazzucato, B. Peyaud, R. Turlay, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, R. Arcidiacono, C. Biino, N. Cartiglia, R. Guida, F. Marchetto, E. Menichetti, N. Pastrone, J. Nassalski, E. Rondio, M. Szleper, W. Wislicki, S. Wronka, H. Dibon, M. Jeitler, M. Markytan, G. Neuhofer, M. Pernicka, A. Taurok, and L. Widhalm

Subjects
mass measurement, Physics, eta meson, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, NA48 EXPERIMENT, Physics::Instrumentation and Detectors, Detector, MESON, CERN, mesoni K, mesoni eta, massa mesoni, K meson, High Energy Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract

New measurements of the $\eta$ and $K^0$ masses have been performed using decays to 3$\pi^0$ with the NA48 detector at the CERN SPS. Using symmetric decays to reduce systematic effects, the results $M(\eta) = 547.843\pm0.051$ MeV/c$^2$ and $M(K^0) = 497.625\pm0.031$ MeV/c$^2$ were obtained., Comment: 17 pages, 4 figures to be published in Physics Letters B

Published
2002

7. Measurement of the quadratic slope parameter in the K-L -> 3 pi(0) decay Dalitz plot

Author

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

Subjects
Physics, neutral kaon, Particle physics, Nuclear and High Energy Physics, Large Hadron Collider, mesoni K, decadimenti, Dalitz plot, kaon decay, dalitz plot, slope parameters, NA48 experiment, Value (computer science), Kaons, High Energy Physics - Experiment, Classical mechanics, Quadratic equation, 3-PI%22">K->3-PI
Abstract

A value of (-6.1 +- 0.9_{stat} +- 0.5_{syst})*10^{-3} is obtained for the quadratic slope parameter h in the K_L -> 3\pi^0 decay Dalitz plot at the NA48 experiment at the CERN SPS. The result is based on 14.7*10^6 fully reconstructed K_L -> 3\pi^0 -> 6\gamma decays. This is the most precise measurement of any of the Dalitz plot slope parameters in the charged and neutral kaon decays so far., Comment: 13 pages, 3 figures, 2 tables

Published
2001

8. A new measurement of the branching ratio of K(S) → γ γ

Author

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

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, mesoni K, decadimenti, Large Hadron Collider, Branching fraction, Detector
Abstract

The decay rate of KS → γγ has been measured with the NA48 detector at the CERN SPS. A total of 149 KS → γγ events have been observed. The branching ratio is determined to be (2.58±0.36(stat)±0.22(sys))×10−6.

Published
2000

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