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11 results on '"J. L. Narjoux"'

1. Determination of ππ scattering lengths from measurement of π+π− atom lifetime

Author

R. Hosek, S. Vlachos, K. Okada, J. Gerndt, V.I. Komarov, Y. Yoshimura, A. Sidorov, P. Leruste, M.J. Tobar, J.-M. Perreau, L. Nemenov, J. Marín, T. Maki, A. Benelli, T. Vrba, G.F. Rappazzo, Masaaki Kobayashi, A. Lamberto, M. Gallas Torreira, V. Yazkov, A.V. Kuptsov, P. Zrelov, M. Zhabitsky, V.M. Ronjin, C. Guaraldo, D. Dreossi, P. Doskarova, S.V. Trusov, C. Schuetz, A. Romero Vidal, V. Lucherini, T. Nunez Pardo, Josue Molina Rodriguez, A. Dudarev, L. Afanasyev, S. Constantinescu, Masami Chiba, V. Kruglov, Tomáš Čechák, J.-L. Narjoux, M. Pentia, C. Ciocarlan, K. I. Kuroda, J. Kluson, R. Lednicky, O. Voskresenskaya, P. Levi Sandri, D. Drijard, V. Olchevskii, J. Schacher, A. Tarasov, A. Riazantsev, M. Gugiu, A. Rodriguez Fernandez, V. Brekhovskikh, I. Manuilov, O. Vazquez Doce, T. Ponta, C. Curceanu, A. Pazos, A. Penzo, L. Tauscher, T. Trojek, Z. Berka, G. Caragheorgheopol, O. Gorchakov, M. Nikitin, J. Saborido, C. Willmott, Paola Gianotti, M. Ferro-Luzzi, M. Plo, V. Karpukhin, L. Kruglova, D. Goldin, Armando Lanaro, A. I. Kulikov, J. Smolik, S. Costantini, Z. Hons, C. Santamarina, M. Hansroul, J. L. Fungueirino Pazos, Panagiotis Kokkas, A. Lopez Agüera, P. Chliapnikov, Fujio Takeutchi, V. Utkin, Bernardo Adeva, V.I. Rykalin, M. Iliescu, F. Gomez, A. Gorin, V. Lapshin, and M. Benayoun

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Nickel, Large Hadron Collider, chemistry, Scattering, Atom, Dirac (software), chemistry.chemical_element, Scattering length, Atomic physics
Abstract

The DIRAC experiment at CERN has achieved a sizeable production of + atoms and has significantly improved the precision on its lifetime determination. From a sample of 21227 atomic pairs, a 4% measurement of the S-wave scattering length di erence ja0 a2j = 0:2533 +0:0080 0:0078 stat

Published
2011
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2. First measurement of the π+π− atom lifetime

Author

Ioannis Evangelou, A. Lamberto, M. Plo, Nikolaos Manthos, V.I. Komarov, M. Gallas, L. Nemenov, V. Olchevskii, T. Maki, P. Zrelov, Armando Lanaro, L. Montanet, L. Kruglova, A.V. Kuptsov, D. Dreossi, S. Vlachos, V.I. Rykalin, C. Petrascu, S. Constantinescu, A. Dudarev, A. Ryazantsev, A. I. Kulikov, J. Smolik, Z. Berka, K. I. Kuroda, J. Kluson, Paola Gianotti, J.-L. Narjoux, Massimiliano Ferro-Luzzi, D. Goldin, G. Caragheorgheopol, J.-M. Perreau, L. Tauscher, A. Benelli, V. Kruglov, G.F. Rappazzo, O. Gorchakov, Makoto Kobayashi, Alessandra Romero, L. Afanasyev, T. Ponta, Bernardo Adeva, M. Nikitin, K. Okada, R. Giacomich, V. Brekhovskikh, J. Saborido, A. Gorin, C. Detraz, D. Pop, A. Lopez Agüera, M. Hansroul, V. Karpukhin, C. Santamarina, Panagiotis Kokkas, P. Levi Sandri, A. Tarasov, A. Penzo, J. Gerndt, M.J. Tobar, F. Takeutchi, V. Yazkov, M. Benayoun, I. Kurochkin, R. Hosek, M. Iliescu, F. Gomez, Y. Yoshimura, A. Sidorov, P. Leruste, Masami Chiba, V. Lucherini, T. Nunez Pardo, Tomáš Čechák, V. Lapshin, O. Vazquez Doce, M. Zhabitsky, C. Schuetz, R. Lednicky, J. Schacher, I. Manuilov, P. Vazquez, V. Utkin, A. Pazos, C. Guaraldo, S.V. Trusov, D. Drijard, M. Pentia, and A. Rodriguez Fernandez

Subjects
Physics, Systematic error, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, Atom (measure theory), Dirac (video compression format), 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences, Measure (mathematics), Pionium
Abstract

The goal of the DIRAC experiment at CERN (PS212) is to measure the $\pi^+\pi^-$ atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the $S$-wave $\pi\pi$ scattering lengths combination $|a_0-a_2|$. Based on part of the collected data we present a first result on the lifetime, $\tau=[2.91 ^{+0.49}_{-0.62}]\times 10^{-15}$ s, and discuss the major systematic errors. This lifetime corresponds to $|a_0-a_2|=0.264 ^{+0.033}_{-0.020} m_{\pi}^{-1}$.

Published
2005
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3. Study of Kins0, Λ and Λ production in S-W collisions at 200 GeV/c per nucleon

Author

J. P. Dufey, A. Kirk, J.B. Kinson, D. Elia, A. Volte, R. Sené, R. P. Barnes, A.K. Holme, V. Lenti, K. Knudson, David H. Evans, J. N. Carney, J.A. Lien, A. C. Bayes, A. Andrighetto, A. Jacholkowski, J. P. Davies, S. Abatzis, B. Ghidini, Håvard Helstrup, B. De La Cruz, Karel Safarik, R. Fini, G. Vassiliadis, M.F. Votruba, W. Beusch, E. Quercigh, J. C. Lassalle, M. Benayoun, F. Navach, O. Villalobos Baillie, V. Manzari, D. Di Bari, R. A. Loconsole, Federico Antinori, Ph. Leruste, B. R. French, Leonardo Paolo Rossi, T. Storås, J. Kahane, M. Venables, J. L. Narjoux, and M. Sené

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Pion, Rapidity, Production (computer science), Nucleon, Spectral line
Abstract

Results on Ks0 production at central rapidity in sulphur-tungsten interactions are presented. The selection procedure used to identify Ks0 particles through their decay to two charged pions is described. The mT spectra for Ks0, Λ and Λ and the relative production rates K s 0 Λ and K s 0 Λ , calculated in the kinematic region pT > 1 GeV/c and 2.5 ≤ yLAB ≤ 3.0, are discussed.

Published
1996
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4. Production of strange and multistrange hyperons and antihyperons in S-W interactions at 200 GeV/c per nucleon

Author

Leonardo Paolo Rossi, A. Kirk, D. Di Bari, Håvard Helstrup, B. De La Cruz, A. C. Bayes, A. Jacholkowski, S. Abatzis, R. A. Fini, O. Villalobos Baillie, G. Vassiliadis, Vito Manzari, J. P. Davies, David H. Evans, J. Kahane, V. Lenti, J. L. Narjoux, B. Ghidini, R. P. Barnes, K. Knudson, E. Quercigh, J. N. Carney, K. Šafařík, A. Volte, F. Navach, R. Sené, Federico Antinori, A. Andrighetto, W. Beusch, J.B. Kinson, M. Benayoun, M. Sené, M.F. Votruba, J. P. Dufey, R. A. Loconsole, D. Elia, B. R. French, Ph. Leruste, A.K. Holme, J. C. Lassalle, and T. Storås

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Hyperon, Spectral line, Nuclear physics, Baryon, Transverse mass, High Energy Physics::Experiment, Heavy ion, Nuclear Experiment, Nucleon
Abstract

Strange and multistrange baryon and antibaryon production is a useful probe into the dynamics of the hot hadronic matter created in central heavy ion interactions. Relative production yields and transverse mass spectra are presented for Λ, Λ, Ξ− and Ξ+ hyperons produced in central sulphur-tungsten interactions at 200 GeV/c per nucleon.

Published
1995
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5. production in sulphur-tungsten interactions at 200 GeV/c per nucleon

Author

S. Abatzis, M.F. Votruba, K. Šafařík, A. Bravar, V. Lenti, K. Knudson, J. N. Carney, J. Kahane, I. J. Bloodworth, Federico Antinori, M. Tamazouzt, M. T. Trainor, V. Manzari, R. Fini, J.B. Kinson, A. Penzo, R. P. Barnes, M. Sené, A. Palano, J. C. Lassalle, A. Jacholkowski, A. Volte, B. De La Cruz, G. Vassiliadis, R. Sené, A. Kirk, J. P. Dufey, R. A. Loconsole, L. Lima Frances, O. Villalobos Baillie, Ph. Leruste, B. R. French, M. Girone, Leonardo Paolo Rossi, A.K. Holme, J. L. Narjoux, Haavard Helstrup, B. Ghidini, David H. Evans, W. Beusch, M. Benayoun, F. Navach, E. Quercigh, A. Malamant, and D. Di Bari

Subjects
Physics, Nuclear and High Energy Physics, Plasma formation, Nuclear Theory, chemistry.chemical_element, Tungsten, Omega, Sulfur, Baryon, Nuclear physics, chemistry, Quark–gluon plasma, Transverse mass, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Multi-strange baryon and antibaryon production is expected to be a useful probe in the search for quark-gluon plasma formation. We present the transverse mass distributions of negative particles, Λ' s , Λ ' s and Ξ − ' s produced in sulphur-tungsten interactions at 200 GeV/c per nucleon and give the corrected rations Λ /Λ, Ξ − /Λ and Ξ − / Λ . Our ratio Ξ − / Λ appears to be larger than that from pp interactions.

Published
1991
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6. Λ and production in sulphur-tungsten interactions at 200 GeV/c per nucleon

Author

W. Beusch, M. Benayoun, F. Navach, M. Stassinaki, A. Volte, R. Sené, E. Quercigh, R. Zitoun, J. Kahane, Leonardo Paolo Rossi, David H. Evans, Michele Arturo Caponero, B. Ghidini, A. Bravar, A. Malamant, R. Fini, A. Jacholkowski, J. L. Narjoux, M. T. Trainor, R. A. Loconsole, B. R. French, A. Kirk, Ph. Leruste, M.F. Votruba, J. C. Lassalle, I. J. Bloodworth, J. P. Dufey, M. Tamazouzt, A. Palano, M. Sené, S. Abatzis, V. Lenti, K. Knudson, J. N. Carney, J.B. Kinson, A. Penzo, L. Lima Frances, G. Vassiliadis, O. Villalobos Baillie, and R. P. Barnes

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Meson, Hadron, Lambda baryon, Charged particle, Nuclear physics, Antimatter, High Energy Physics::Experiment, Rapidity, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Results from the WA85 Experiment at the CERN Ω Spectrometer are presented. A 200 A GeV/ c beam of 32 S ions was used with a tungsten target. The apparatus is used to detect V 0, s and charged tracks in the range p T > 0.9 GeV/ c and 2.3 Y lab Λ and negative hadrons all show a linear increase with rapidity density in the range 70–140 as expected from models based on a superposition of independent NN collisions.

Published
1990
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7. A spin-parity analysis of the f1(1285) and f1(1420) mesons centrally produced in the reaction pp→pf(KS0K±π∓)ps at 300 GeV/c

Author

B. Ghidini, R. Sené, A. Kirk, Giuseppe Zito, F. Navach, J.B. Kinson, A. Palano, A. Malamant, Yves Goldschmidt-Clermont, B. R. French, R. Zitoun, J. Kahane, V. Lenti, K. Knudson, M. Sené, J. N. Carney, H. R. Shaylor, N. G. Redaelli, O. Villalobos Baillie, A. Jacholkowski, Michele Arturo Caponero, M. Stassinaki, M. T. Trainor, W. Beusch, E. Quercigh, T. A. Armstrong, M. Benayoun, G. Vassiliadis, R. Childs, Leonardo Paolo Rossi, Ph. Leruste, J. L. Narjoux, M.F. Votruba, and I. J. Bloodworth

Subjects
Physics, Nuclear and High Energy Physics, Meson, Parity (physics), Atomic physics
Abstract

Results are presented of an analysis of the reaction pp→p f (K S 0 K ± π ∓ )p s at 300 GeV/ c . Clear f 1 (1285) and f 1 (1420) signals are seen. A spin-parity analysis shows that both are consistent with being 1 ++ states. The f 1 (1420) is found to decay only to K ∗ K and no 0 −+ or 1 +− waves are required to describe the data. The production of the f 1 (1285) as a function of energy is not the same as that for the f 1 (1420) whose cross section is found to be constant with energy.

Published
1989
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8. Evidence for new states produced in the central region in the reaction pp→pf(π+π−π+π−)ps at 300 GeV/c

Author

M. T. Trainor, E. Quercigh, A. Jacholkowski, W. Beusch, O. Villalobos Baillie, Giuseppe Zito, J. Kahane, V. Lenti, M. Benayoun, Ph. Leruste, R. Sené, M. Stassinaki, A. Malamant, I. J. Bloodworth, N. G. Redaelli, T. A. Armstrong, Leonardo Paolo Rossi, R. Zitoun, B. Ghidini, J. L. Narjoux, A. Kirk, K. Knudson, A. Palano, J. N. Carney, F. Navach, M. Sené, J.B. Kinson, G. Vassiliadis, R. Childs, M.F. Votruba, and B. R. French

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Mass spectrum, Atomic physics, Central region, Particle Physics - Experiment
Abstract

The reaction pp→pf(π+π−π+π−)ps, where the π+π−π+π− system is centrally produced, has been studied at 300 GeV/c in an experiment designed to search for gluonic states. The π+π−π+π− mass spectrum shows evidence for the f1(1285) with a mass of 1281±1 MeV and a width of 31±5 MeV. In addition there is evidence for two new enhancements at masses of 1449±4 and 1901±13 MeV with widths of 78±18 and 312±61 MeV respectively. An analysis of the state at 1.45 GeV indicates that it is not a π+π−π+π− decay mode of the f1(1420) or ι η(1440) .

Published
1989
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9. Evidence for higher twist mechanisms in prompt ϱ0-meson production at PT > 2 GeV/c in 300 GeV/c Π−N interactions

Author

M. Sene, V. Lenti, M. Stassinaki, O. Villalobos Baillie, C. Neaume, J. L. Narjoux, R. Sené, J. C. Lassalle, J. Kahane, B. R. French, Z. Strachman, W. Beusch, Yves Goldschmidt-Clermont, M. Benayoun, A. Palano, M. T. Trainor, Giuseppe Zito, Gunnar Ingelman, R. Zitoun, A. Jacholkowski, I. C. Print, J.B. Kinson, K. Knudson, B. Ghidini, J. N. Carney, F. Navach, A. Malamant, M. Pimenta, Ph. Leruste, Roberto Petronzio, E. Quercigh, M.F. Votruba, A. Burns, I. J. Bloodworth, G. Vassiliadis, and H. R. Shaylor

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Scattering, Hadron, Parton, Omega, Nuclear physics, Recoil, High Energy Physics::Experiment, Twist, Nuclear Experiment
Abstract

The production of ϱ 0 mesons in hadronic interactions is investigated at high transverse momentum ( p T > 2 GeV/ c ). The data come from a sample of Π − N interactions at 300 GeV/ c obtained at the CERN OMEGA spectrometer, requiring a ϱ 0 →Π + Π − with p T (pair) > 2 GeV/ c to recoil against an opposite particle with p T (opposite) > 1 GeV/ c . The signal/(signal + background) ratio of ϱ 0 production shows an increase of 38% as x E = p T (opposite)/ p T (pair) decreases from 0.5 x E x E ⩽ 0.5. This increase is not compatible with a QCD model of parton scattering and subsequent fragmentation. It is interpreted as evidence for direct ϱ 0 production via QCD higher twist processes, in terms of which a quantitative agreement with the data is found.

Published
1987
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10. Observation of centrally produced (1720) in the reaction at 300 GeV/c

Author

R. Childs, M.F. Votruba, A. Kirk, B. Ghidini, M. Sené, M. Stassinaki, M. Girone, G. Vassiliadis, A. Jacholkowski, V. Lenti, J. Kahane, I. J. Bloodworth, T. A. Armstrong, A. Malamant, B. R. French, M. T. Trainor, C. Evangelista, Ph. Leruste, K. Knudson, E. Quercigh, J. N. Carney, N. G. Redaelli, F. Navach, W. Beusch, John R. Woodward, M. Benayoun, J.B. Kinson, O. Villalobos Baillie, A. Palano, Leonardo Paolo Rossi, and J. L. Narjoux

Subjects
Physics, Momentum, Nuclear and High Energy Physics, Hadron, Mass spectrum, Atomic physics, Spin (physics)
Abstract

The K + K − and K S 0 K S 0 systems centrally produced in the reaction pp→p f K K p s have been studied at 300 GeV/ c incident momentum. Both the K + K − and the K S 0 K S 0 mass spectra show large resonant production. For the first time in hadron collisions, clear evidence is found for the θ f 2 (1720) with parameters m =1713±10 MeV, Γ =181±30 MeV for the K + K − decay mode and m =1706±10 MeV, Γ =104±30 MeV for the K S 0 K S 0 decay mode. A spin analysis of the K + K − spectrum shows that for the θ f 2 (1720) J P =2 + is strongly favoured while 0 + and 1 − are excluded.

Published
1989
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11. Observation of double φ-meson production in the central region for the reaction pp→pf(K+K−K+K−)ps at 300 GeV/c

Author

V. Lenti, Ph. Leruste, T. A. Armstrong, Leonardo Paolo Rossi, J. L. Narjoux, Yves Goldschmidt-Clermont, B. Ghidini, M. Sené, H. R. Shaylor, N. G. Redaelli, A. Palano, R. Zitoun, I. J. Bloodworth, K. Knudson, A. Malamant, S. J. Prosser, J. N. Carney, Giuseppe Zito, G. Vassiliadis, A. Jacholkowski, F. Navach, B. R. French, R. Childs, W. Beusch, J.B. Kinson, A. Kirk, M. Stassinaki, M.F. Votruba, E. Quercigh, R. Sené, O. Villalobos Baillie, J. Kahane, M. Caponero, M. T. Trainor, and M. Benayoun

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Meson production, Atomic physics, Central region, Particle Physics - Experiment
Abstract

The reaction pp→p f (K + K − K + K − )p s in which the K + K − K + K − system is centrally produced has been studied at 300 GeV/ c . φφ production has been observed and the ratio σ (φK + K − )/ σ ( φφ ) is 1.0±0.3. The cross section for central production of φφ is found to be the same at 300 GeV/ c and 85 GeV/ c . An angular analysis of the φφ system favours J P =2 + over 0 − .

Published
1989
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