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7 results on '"B. Pijlgroms"'

1. Observation of the decay Ks → 2γ and measurement of the decay rates KL → 2γ and KS → 2γ

Author

R. Carosi, G. Quast, M. Hassan, A. Bigi, I. Mannelli, G. Kesseler, Ian Shipsey, J. Muir, D. J. Candlin, N. Doble, D.C. Cundy, L. Bertanza, G. Dietrich, H. D. Wahl, B. Renk, Konrad Kleinknecht, Arthur Schaffer, H. G. Sander, H. Burkhardt, M. Holder, R. Chase, E. Massa, Peter Clarke, D. Heyland, M. Corti, C. Youngman, P. Steffen, R. Hagelberg, A. M. Lutz, Ph Heusse, W. Heinen, B. Panzer, R. Black, A. Nappi, W. Weihs, G. M. Pierazzini, Ken Peach, J. Steinberger, E. Auge, L. Gatignon, W. Stephenson, Clemens Becker, C. Cerri, M. Calvetti, J. van der Lans, M. Kasemann, H. Blümer, B. Pijlgroms, M. Rost, G. Zech, Daniel Fournier, H. Taureg, R. Casali, and T. Miczaika

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Abstract

The decay rates of K L → 2γ and K S → 2γ have been measured at the CERN SPS. The results are Γ (K L →2 γ )/ χ (K L →2 π 0 )=0.632±0.004±0.008 and Γ (K S →2 γ )/ Γ (K L →2 γ )=2.3 ±1.0±0.4. This is the first observation of K S →2γ decays.

Published
2016

2. 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

3. 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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4. Neutral $D$ meson properties in 360 GeV/c $\pi^{-}p$ interactions

Author

E. Johansson, M. Deutschmann, E. P. Kistenev, K. Shankar, Jose M Hernandez, Evgueni Vlasov, Yu. Fisjak, D. Huss, Simonetta Gentile, H. Rohringer, S. O. Holmgren, M. E. Michalon-Mentzer, P. V. Chliapnikov, J. Richardson, M. Iori, P. Beillère, T. Trevisan, J. R. Fry, T. Yamagata, P. E. Stamer, S. J. Colwill, Jacques Lemonne, M. Schouten, Josef Hrubec, C. Defoix, S. Rinaudo, M. Pernicka, L. Ventura, F. Marzano, P. K. Malhotra, T. Tsurugai, Reinhard W. Schulte, F. Fontanelli, V. Knjasev, Edoardo Castelli, M. MacDermott, J. H. Wickens, J. F. Baland, B. Epp, N. Oshima, R. Raghavan, M. A. Houlden, W. Struczinski, K. Sudhakar, Giorgio Borreani, H. Briand, T. Moa, B. Vonck, A. Gurtu, R. Bizzarri, P. R. S. Wright, A. De Angelis, Jörg Schmiedmayer, A. Subramanian, B. Castano, W. M. Bugg, Alan Poppleton, B. Sellden, L. Zanello, S. Nilsson, E. Di Capua, F. Marchetto, C. Caso, Gianni Zumerle, H. Nowak, Speranza Falciano, L. Montanet, M. Mazzucato, S. N. Ganguli, B. M. Whyman, P. Poropat, C. Willmott, C. Pinori, J.M. Morton, T. Handler, G. Neuhofer, G. Otter, J. Dumarchez, G. Bertrand-Coremans, S. Kitamura, M. Cl. Touboul, M. Cresti, L. de Billy, S. Squarcia, P. Mason, H. K. Nguyen, P. Lutz, K. M. Stopchenko, B. Pijlgroms, G. Marel, Ph. Herquet, J. Dolbeau, L. Peruzzo, E. Jegham, S. Banerjee, W. Bartl, Paolo Bagnaia, Ph. Hughes, R. Di Marco, Clara Troncon, G. D. Patel, A. Michalon, Pierre Vilain, J. Cl. Marin, G. Piredda, P. Pilette, Ugo Gasparini, P. Ladron de Guevara, C. Fisher, V. Nikolaienko, G. Sartori, M. Laloum, Pierluigi Zotto, W.W.M. Allison, Fernand Grard, Rene Brun, D. Crennell, H. Schlütter, Alessandro Bettini, G. Ciapetti, R.J. Plano, L. Haupt, K. Roberts, R. Hamatsu, C. Fernandez, I. Kita, S. Reucroft, H. Leutz, Marco Sessa, Alain Hervé, Sten Hellman, M. Aguilar-Benitez, E. L. Hart, R. Contri, and Paolo Checchia

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Hydrogen, chemistry, Branching fraction, D meson, chemistry.chemical_element, Atomic physics, Particle Physics - Experiment
Abstract

Based on a sample of 22 four-prong D 0 / D 0 decays produced in hydrogen by 360 GeV/ c π − , we present the following new results: mean lifetime τ = (3.5 −0.9 +1.4 ) x 10 −13 s ; production cross section for x F > 0.0, σ = (10.3 ± 3.5) ωb ; the D → K ± π ± π + π − branching ratio = (7.1 ± 2.5)%.

Published
1984

5. Search for a neutral Higgs particle in the decay sequence $K^{0}_{L} \to \pi^{0}H^{0}$ and $H^{0} \to e^{+}e^{-}$

Author

H. Taureg, H.N. Nelson, A. M. Lutz, M. Calvetti, M. Rost, G.M. Pierazzini, G.D. Barr, H. G. Sander, B. Renk, H. D. Wahl, Arthur Schaffer, Ken Peach, T. Miczaika, W. Stephenson, W. Weihs, R.L. Chase, B. Pijlgroms, I. Mannelli, R. Heinz, A. Nappi, Daniel Fournier, H. Rohrer, L. Gatignon, P. Calafiura, B. Panzer, V. Gibson, L. Bertanza, C. Youngman, H. Blümer, Ian Shipsey, N. Doble, Konrad Kleinknecht, C. Cerri, J. Muir, D. J. Candlin, Lydia Iconomidou-Fayard, P. Grafström, R. Casali, G. Quast, I. Harrus, A. Bigi, J. van der Lans, G. Zech, M. Corti, D. Coward, G. Kesseler, M. Kasemann, R. Hagelberg, R. Carosi, D.C. Cundy, R. Black, E. Augé, P. Mayer, M. Holder, Ph. Heusse, Peter Clarke, and H. Burkhardt

Subjects
Physics, Nuclear and High Energy Physics, Sequence, Particle physics, Range (particle radiation), Large Hadron Collider, Branching fraction, Elementary particle, Super Proton Synchrotron, Standard Model, Nuclear physics, Higgs boson, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract

We have searched for the sequence of decays K L 0 → π 0 H 0 and H 0 →e + e − at the CERN Super Proton Synchrotron (SPS), and have allowed for a non-zero H 0 lifetime. Three candidates have been seen, consistent with an expected background of 3.3. Limits on the branching ratio product in the range 10 −8 –10 −7 are presented as a function of the mass and lifetime of the H 0 . These can be used to restrict the neutral Higgs of the minimal standard model.

Published
1989

6. FIRST EVIDENCE FOR DIRECT CP VIOLATION

Author

H. BURKHARDT, P. CLARKE, D. COWARD, D. CUNDY, N. DOBLE, L. GATIGNON, V. GIBSON, R. HAGELBERG, G. KESSELER, J. VAN DER LANS, I. MANNELLI, T. MICZAIKA, A.C. SCHAFFER, J. STEINBERGER, H. TAUREG, H. WAHL, C. YOUNGMAN, G. DIETRICH, W. HEINEN, R. BLACK, D.J. CANDLIN, J. MUIR, K.J. PEACH, B. PIJLGROMS, I.P. SHIPSEY, W. STEPHENSON, H. BLÜMER, M. KASEMANN, K. KLEINKNECHT, B. PANZER, B. RENK, E. AUGÉ, R.L. CHASE, M. CORTI, D. FOURNIER, P. HEUSSE, L. ICONOMIDOU-FAYARD, A.M. LUTZ, H.G. SANDER, A. BIGI, M. CALVETTI, R. CAROSI, R. CASALI, C. CERRI, G. GARGANI, E. MASSA, A. NAPPI, G.M. PIERAZZINI, C. BECKER, D. HEYLAND, M. HOLDER, G. QUAST, M. ROST, W. WEIHS, and G. ZECH

Subjects
Physics, Particle physics, Large Hadron Collider, CP violation
Published
1989

7. The beam and detector for a high-precision measurement of cp violation in neutral-kaon decays

Author

E. Massa, H. Taureg, E. Auge, M. Calvetti, C. Youngman, M. Rost, B. Panzer, G. Kesseler, A. M. Lutz, A. Nappi, S. Galeotti, R. Carosi, D.C. Cundy, M. Kasemann, W. Heinen, Ian Shipsey, R. Hagelberg, D. Heyland, A. Bigi, I. Mannelli, Gunter Quast, R. Black, R. Chase, J. Steinberger, H. Blümer, F. Eisele, G. M. Pierazzini, L. Gatignon, M. Holder, Ph Heusse, H. D. Wahl, J. Muir, G. Dietrich, D. J. Candlin, T. Miczaika, R. Casali, W. Stephenson, W. Weihs, M. Corti, H. G. Sander, G. Zech, P. Steffen, J. van der Lans, B. Renk, C. Cerri, R. Fantechi, H. Burkhardt, Peter Clarke, N. Doble, Ken Peach, B. Pijlgroms, Daniel Fournier, Konrad Kleinknecht, Arthur Schaffer, Clemens Becker, D. Passuello, 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
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, Cryogenics, 01 natural sciences, 7. Clean energy, Super Proton Synchrotron, Calorimeter, Nuclear physics, Magnet, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Accelerator Physics, CP violation, High Energy Physics::Experiment, Detectors and Experimental Techniques, 010306 general physics, Instrumentation, Beam (structure)
Abstract

The K0 beam and detector used for a high-precision measurement of the CP-violation parameter ϵ′ at the CERN Super Proton Synchrotron (SPS) are described. The beam provides KL and KS alternately through a common decay region. The detection of the decays is based on wire chambers and calorimeters without employing a magnet. The trigger and readout system achieve a high selectively for the suppressed, CP-violating, two-pion decays of the KL by incorporation of hard-wired processors. The readout is based on Fastbus for maximum data rates.

Published
1988

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