Search

Your search keyword '"E. Rozaki"' showing total 20 results
Start Over Author "E. Rozaki"
20 results on '"E. Rozaki"'

1. The CPLEAR detector at CERN

Author

K. Philippoussis, H. Verweij, G. Backenstoss, P. Bloch, G. Kesseler, A. Haselden, Andrej Filipcic, P. Pavlopoulos, F. Louis, D. Damianoglou, E. Rozaki, Panagiotis Kokkas, Dominique Durand, P.-R. Kettle, M. Bonnet, F. Bal, H.U. Johner, Claude Guyot, M. Steinacher, P. Petit, T. Alhalel, R.W. Hollander, Andras Kerek, Ch Yèche, D.A. Troster, L. Faravel, M. Mikuž, D. Francis, O. Behnke, B. Eckart, Sp. Dedoussis, J. Duclos, K. Sarigiannis, C. Engster, J.P. Bard, E. Gabathuler, M. Dedieu, R. Rickenbach, T. Ruf, Mats Danielsson, R. Adler, N. Dudragne, C. Jacobs, C.P. Marin, P. Weber, Ph. Schune, E. Machado, M. Schafer, V. Bertin, P.F. Harrison, H.-J. Gerber, F. Leimgruber, A. Schopper, K. Jansson, H. Martin, Christopher Bee, L. Sacks, Ioannis Evangelou, W.G. Heyes, P. Gumplinger, M. Dodgson, R. Le Gac, A. Ealet, T. Nakada, H. Postma, E. Hazen, L. Sakeliou, R. Daniel, Ch. Bula, E. Aslanides, Nikolaos Manthos, P Harrison, P.J. Hayman, W. Albrecht, F. Nanni, M. Chardalas, Per Carlson, H. Tschopp, M.B. Chertok, A. Liolios, D. Lecouturier, Ch. Rhême, D. Garreta, J.C. Michau, W. Fetscher, C. Witzig, J. R. Fry, M. Fidecaro, P. Fassnacht, A. Benelli, C.W.E. van Eijk, Christer Fuglesang, G. S. Varner, A. Go, E. Hubert, M. Dröge, K. Jon-And, S. Tatsis, Claudio Santoni, Marc Dejardin, B.L. Roberts, Lukas A. Schaller, A. Calzas, F. Blanc, U. Mall, D. King, R. Gamet, C. Touramanis, T. Geralis, D. Guyon, C. Kochowski, N. Karkour, D. Zimmerman, T. Klados, Frixos A Triantis, Danilo Zavrtanik, F. Henry-Couannier, C. Felder, D. Barraca, B. Pagels, A. Soares, D. Linget, João Carvalho, F. Montanet, L. Tauscher, P. Dechelette, P. Tsilimigras, B. Lofstedt, K. Kontek, Marcin Wladyslaw Wolter, P. Sanders, I. Papadopoulos, J. Derre, F. Pelucchi, P. Maley, O. Wigger, B. van Koningsveld, Jeffrey Boone Miller, A.J.P.L. Policarpo, D. Geiss, T. Lawry, H. Wendler, G. Chardin, Jean-Louis Faure, J. Kern, C. Thibault, C. Eleftheriadis, Stef. Charalambous, D. Warner, G. Polivka, Michael C. Carroll, R. Kreuger, A. Apostolakis, G. Marel, I. Tsamouranis, P. Charra, Sotirios Vlachos, A. Angelopoulos, J. Pinto da Cunha, A. Onofre, T. Schietinger, J. Bennet, Igor Mandić, A. Dijksman, J.P. Vanuxem, Y. Gally, R. Ferreira-Marques, E. van Beveren, F. Touchard, J. A. P. Da Silva, A. Cody, B. Dinkespiller, E. Cawley, E. Watson, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), CPLEAR, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Lorgeril, Jocelyne

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Large Hadron Collider, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Cherenkov detector, Detector, Tracking (particle physics), 7. Clean energy, 01 natural sciences, Particle identification, law.invention, Nuclear physics, Time of flight, law, Antiproton, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Detectors and Experimental Techniques, 010306 general physics, Instrumentation
Abstract

The CPLEAR collaboration has constructed a detector at CERN for an extensive programme of CP-, T- and CPT-symmetry studies using ${\rm K}^0$ and $\bar{\rm K}^0$ produced by the annihilation of $\bar{\rm p}$'s in a hydrogen gas target. The ${\rm K}^0$ and $\bar{\rm K}^0$ are identified by their companion products of the annihilation ${\rm K}^{\pm} \pi^{\mp}$ which are tracked with multiwire proportional chambers, drift chambers and streamer tubes. Particle identification is carried out with a liquid Cherenkov detector for fast separation of pions and kaons and with scintillators which allow the measurement of time of flight and energy loss. Photons are measured with a lead/gas sampling electromagnetic calorimeter. The required antiproton annihilation modes are selected by fast online processors using the tracking chamber and particle identification information. All the detectors are mounted in a 0.44 T uniform field of an axial solenoid of diameter 2 m and length 3.6 m to form a magnetic spectrometer capable of full on-line reconstruction and selection of events. The design, operating parameters and performance of the sub-detectors are described.}

Published
1996

2. Measurement ofCP violation parameters and test ofCPT invariance with$$\overline {K^0 } $$ and K0 at LEARand K0 at LEAR

Author

Lukas A. Schaller, Danilo Zavrtanik, R. Le Gac, L. Tauscher, E. Machado, Nikolaos Manthos, A. Liolios, L. Faravel, P. R. Kettle, F. Blanc, Marc Dejardin, P. Sanders, A. Go, Sp. Dedoussis, A.J.P.L. Policarpo, C. Kochowski, J. R. Fry, W. Fetscher, A. Cody, Ph. Schune, G. S. Varner, A. Ealet, M. Schafer, J. Duclos, B. Pagels, E. Rozaki, R. Kreuger, A. Haselden, C. Thibault, I. Papadopoulos, G. Marel, T. Nakada, P. Pavlopoulos, B. L. Roberts, V. Bertin, C. Felder, Claudio Santoni, Andrej Filipcic, Elie Aslanides, C. Eleftheriadis, R.W. Hollander, Michael C. Carroll, João Carvalho, F. Montanet, Mats Danielsson, R. Adler, P. Weber, F. Henry-Couannier, Claude Guyot, A. Apostolakis, O. Wigger, O. Behnke, D. Garreta, F. Leimgruber, Ch Yèche, E. van Beveren, B. Eckart, F. Touchard, Frixos A Triantis, P.J. Hayman, E. Cawley, R. Gamet, Stef. Charalambous, T. Ruf, Marko Mikuz, Marcin Wladyslaw Wolter, J. Derre, G. Polivka, A. Benelli, C.W.E. van Eijk, R. Ferreira-Marques, Ioannis Evangelou, Ch. Bula, L. Sakeliou, J. Pinto da Cunha, M. Fidecaro, Per Carlson, G. Chardin, Jean-Louis Faure, G. Backenstoss, K. Sarigiannis, P. Fassnacht, Panagiotis Kokkas, A. Onofre, Igor Mandić, Christopher Bee, D. Francis, E. Hubert, T. Alhalel, A. Schopper, E. Gabathuler, R. Rickenbach, H.-J. Gerber, Sotirios Vlachos, D. Zimmerman, A. Angelopoulos, M. Chardalas, M.B. Chertok, K. Jon-And, A. Soares, C. Touramanis, Jeffrey Boone Miller, and P. Bloch

Subjects
Physics, Nuclear physics, Particle physics, Large Hadron Collider, Overline, Homogeneous space, Parity (physics), General Agricultural and Biological Sciences
Abstract

The CPLEAR experiment at CERN studies theCP, T andCPT symmetries in the neutral-kaon system by measuring the rate asymmetries between the decays of initially pure K0 and $$\overline {K^0 } $$ states. Using data taken between 1990 and mid 1994, precise measurements of |η+-|,φ +- and Δm are reported. The comparison of φ+- the superweak phase gives one of the most sensitive tests ofCPT invariance and leads to a new limit on the $$K^0 - \overline {K^0 } $$ mass difference.

Published
1996

3. Observation of the CP-conserving Ks → π+π−π0 decay amplitude

Author

L. Faravel, P. Carlson, W. Fetscher, H. Postma, F. Henry-Couannier, O. Behnke, D. Garreta, M. Mikuž, L. Sacks, F. Leimgruber, Ioannis Evangelou, A. Schopper, D. Francis, C. Witzig, J. Duclos, R. Ferreira-Marques, Mats Danielsson, R. Adler, P.J. Hayman, P.F. Harrison, Andrej Filipcic, J. Derre, P.-R. Kettle, H.U. Johner, E. Gabathuler, R. Rickenbach, P. Gumplinger, Ch Yèche, Stef. Charalambous, B. Eckart, O. Wigger, L. Tauscher, L. Sakeliou, C. Touramanis, R. Le Gac, Claude Guyot, F. Blanc, T. Ruf, E. Machado, J. K. Bienlein, Frixos A Triantis, R. Gamet, Philippe Bloch, P. Pavlopoulos, Ph. Schune, G. Polivka, C. Kochowski, E. Aslanides, L.A. Schaller, Panagiotis Kokkas, K. Jansson, A. Ealet, T. Geralis, B.L. Roberts, M. Chardalas, M.B. Chertok, B. Pagels, Sotirios Vlachos, Danilo Zavrtanik, K. Jon-And, A. Angelopoulos, Claudio Santoni, G. Backenstoss, P. Fassnacht, R. Kreuger, A. Haselden, J. R. Fry, J. Pinto da Cunha, E. Rozaki, E. Hubert, A. Benelli, C.W.E. van Eijk, D.A. Troster, Sp. Dedoussis, Marcin Wladyslaw Wolter, F. Pelucchi, João Carvalho, F. Montanet, D. Zimmerman, Jeffrey Boone Miller, G. S. Varner, R.W. Hollander, C. Fuglesang, A. Onofre, M. Schafer, T. Lawry, Nikolaos Manthos, C. Felder, T. Alhalel, V. Bertin, T. Schietinger, Ch. Bula, M. Dodgson, A. Go, H.-J. Gerber, W.G. Heyes, A. Soares, A. Liolios, G. Chardin, Jean-Louis Faure, M. Fidecaro, A. Apostolakis, J. Bennet, I. Papadopoulos, C. Thibault, P. Maley, G. Marel, T. Nakada, P. Sanders, C. Eleftheriadis, Igor Mandić, A.J.P.L. Policarpo, P. Weber, Marc Dejardin, Michael C. Carroll, Christopher Bee, A. Cody, K. Sarigiannis, E. Cawley, E. van Beveren, and F. Touchard

Subjects
Physics, Nuclear and High Energy Physics, Amplitude, Branching fraction, Quantum mechanics, Phase space, Zero (complex analysis), Atomic physics, Interference (wave propagation)
Abstract

The interference between CP-conserving Ks and K L → π + π − π 0 decay amplitudes was observed by studying the decay rate asymmetries between initial K 0 and K 0 separately for the phase space regions E CM ( π + ) > E CM ( π − ) and E CM ( π + ) E CM ( π − ). For the parameter λ we found Re(λ) = 0.036 ± 0.010(stat.) −0.003 +0.002 (syst.) and Im(λ) consistent with zero, leading to a branching ratio B = [4.1 −1.9 +2.5 (stat.) −0.6 +0.5 (syst.)] × 10 −7 for the CP-conserving K S → π + π − π 0 decay.

Published
1996

4. Measurement of the CP violation parameter η+− using tagged K0 and 0

Author

M. Chardalas, M.B. Chertok, K. Jon-And, T. Alhalel, R. Le Gac, M. Schafer, A. Haselden, C. Thibault, J. Bennet, Andrej Filipcic, R.W. Hollander, Claudio Santoni, C. Felder, P. Carlson, Mats Danielsson, R. Adler, W. Fetscher, T. Nakada, Igor Mandić, R. Ferreira-Marques, E. Cawley, C. Eleftheriadis, E. Aslanides, J. R. Fry, João Carvalho, F. Montanet, H.U. Johner, Claude Guyot, P.F. Harrison, H.-J. Gerber, F. Henry-Couannier, W.G. Heyes, G. S. Varner, P.-R. Kettle, V. Bertin, L. Tauscher, Ch Yèche, B. Eckart, O. Wigger, L. Faravel, P. Sanders, E. Machado, J. Derre, Panagiotis Kokkas, D. Garreta, G. Policarpo, D. Gamet, Stef. Charalambous, C. Touramanis, J. K. Bienlein, Nikolaos Manthos, B.L. Roberts, Ch. Bula, Frixos A Triantis, O. Behnke, A. Liolios, A. Cody, L. Sacks, Philippe Bloch, M. Dodgson, Marc Dejardin, F. Leimgruber, Sp. Dedoussis, G. Polivka, Sotirios Vlachos, A. Schopper, M. Fidecaro, T. Schietinger, H. Postma, T. Geralis, A. Benelli, C.W.E. van Eijk, P.J. Hayman, Danilo Zavrtanik, A. Go, A. Angelopoulos, Ph. Schune, G. Backenstoss, Marcin Wladyslaw Wolter, J. Pinto da Cunha, I. Papadopoulos, P. Weber, A. Ealet, F. Pelucchi, T. Lawry, J. Duclos, E. van Beveren, F. Touchard, P. Maley, A. Soares, M. Mikuž, D. Francis, P. Pavlopoulos, A. Onofre, T. Ruf, R. Gamet, K. Jansson, G. Chardin, Jean-Louis Faure, L.A. Schaller, E. Rozaki, C. Witzig, K. Sarigiannis, F. Blanc, C. Kochowski, Christopher Bee, B. Pagels, Jeffrey Boone Miller, C. Fuglesang, Ioannis Evangelou, R. Kreuger, E. Gabathuler, R. Rickenbach, P. Gumplinger, A. Apostolakis, G. Marel, L. Sakeliou, Michael C. Carroll, P. Fassnacht, E. Hubert, D. Zimmerman, and D.A. Troster

Subjects
Nuclear physics, Physics, Semileptonic decay, Nuclear and High Energy Physics, media_common.quotation_subject, CP violation, Asymmetry, media_common
Abstract

The CP violation parameter η+− is determined through the eigentime-dependent asymmetry in the rates of initially tagged K0 and K 0 decaying to π+π−. The obtained values are |η+−| = (2.312 ± 0.043stat. ± 0.030syst. ± 0.011τs) × 10−3 and Φ+− = 42.7° ± 0.9stat.° ± 0.6syst.° ± 0.9Δm° with Δ = (527.4 ± 2.9) × 10 7 h gs −1 measured in the same experiment using the semileptonic decay channel.

Published
1995

5. Inclusive measurement of $$\bar p$$ annihilation at rest in gaseous hydrogen to final states containingρ andf 2

Author

R. Le Gac, E. Aslanides, J. R. Fry, P. Bloch, G. S. Varner, P. Sanders, J.C. Dousse, T. Alhalel, Christopher Bee, Mats Danielsson, R. Adler, A. Haselden, Ioannis Evangelou, O. Wigger, R.W. Hollander, M. Chardalas, M.B. Chertok, K. Jon-And, P. Gumplinger, L. Sakeliou, A.J.P.L. Policarpo, L. Faravel, H.-J. Gerber, Jeffrey Boone Miller, Stef. Charalambous, Per Carlson, T. Nakada, W. Fetscher, J. K. Bienlein, K. Sarigiannis, E. Gabathuler, L. Sacks, R. Richkenbach, D.A. Troster, W.G. Heyes, C.W.E. van Eijk, G. Polivka, A. Go, H. Postma, Christer Fuglesang, R. Gamet, Nikolaos Manthos, P. Fassnacht, Sp. Dedoussis, Ch. Bula, M. Schafer, A. Liolios, Lukas A. Schaller, P. Pavlopoulos, F. Henry-Couannier, A. Soares, C. Touramanis, Marcin Wladyslaw Wolter, C. Witzig, P. Weber, J. Bennet, J. Derre, M. Fidecaro, P. F. Harrisch, F. Pelucchi, Frixos A Triantis, B. Eckart, A. Angelopoulos, J. Pinto da Cunha, D. Zimmerman, C. Thibault, O. Behnke, C. Kochowski, T. Lawry, M. Mikuž, D. Francis, T. Geralis, B. L. Roberts, Danilo Zavrtanik, B. Pagels, C. Eleftheriadis, A. Schopper, R. Ferreira-Marques, P. Maley, Andras Kerek, P.J. Hayman, Igor Mandić, Francois Touchard, A. Onofre, Panagiotis Kokkas, C. Felder, C. Yeche, V. Bertin, P.R. Kettle, L. Tauscher, G. Chardin, Jean-Louis Faure, E. Machado, D. Garreta, J. Kern, G. Backenstoss, R. Kreuger, A. Apostolakis, Andrej Filipcic, H.U. Johner, Claude Guyot, A. Cody, S. Vlachos, G. Marel, E. Cawley, J. Duclos, T. Ruf, K. Jansson, E. van Beveren, Marc Dejardin, E. Rozaki, M. Dodgson, Claudio Santoni, João Carvalho, F. Montanet, Ph. Schune, and A. Ealet

Subjects
Physics, Annihilation, Physics and Astronomy (miscellaneous), Hydrogen, Meson, Gaseous hydrogen, chemistry.chemical_element, Elementary particle, Nuclear physics, chemistry, Antiproton, Quantum field theory, Atomic physics, Engineering (miscellaneous)
Abstract

Antiproton annihilation at rest in gaseous hydrogen (16 bar pressure) to the final states ρ(770)X andf2(1270)X, whereX stands for one or more neutral mesons, has been studied at LEAR using the CPLEAR detector. Relative branching ratios are given forX =π0,2π0, 3π0 ω in the ρ case, and forX =π0, η in thef2 case. The annihilation channel\(\bar pp \to \rho 3\pi ^0 \) has not been measured before. The fraction of P-wave annihilation is deduced from the ratiof2π0/ρπ0 to be 0.38±0.07, in good agreement with the result previously obtained by CPLEAR from the ratioK+K-/π+π-.

Published
1995

6. Bose-Einstein correlations in $$\bar p$$ p annihilations at rest

Author

P. Fassnacht, P. Sanders, A.J.P.L. Policarpo, Claudio Santoni, O. Behnke, K. Jon-And, A. Schopper, A. Haselden, P.J. Hayman, Jeffrey Boone Miller, M. Mikuž, D. Francis, L. Faravel, K. Sarigiannis, João Carvalho, F. Montanet, D. Zimmerman, C. Touramanis, E. van Beveren, R.W. Hollander, E. Rozaki, Christopher Bee, P. Weber, R. Gamet, B. Eckart, Frixos A Triantis, L. Tauscher, R. Le Gac, F. Touchard, Andras Kerek, E. Machado, L.A. Schaller, E. Aslanides, T. Nakada, L. Sacks, H. Postma, C. Fuglesang, T. Geralis, A. Apostolakis, J. Bennet, R. Kreuger, J. Duclos, T. Ruf, Igor Mandić, M. Dodgson, J. R. Fry, G. S. Varner, Danilo Zavrtanik, K. Jansson, A. Cody, Philippe Bloch, Ioannis Evangelou, P. Carlson, W. Fetscher, P. Gumplinger, L. Sakeliou, P. Maley, Sp. Dedoussis, S. Vlachos, C. Felder, D.A. Troster, C. Witzig, C. Yeche, M. Chardalas, G. Marel, F. Henry-Couannier, M.B. Chertok, M. Schafer, E. Cawley, C.W.E. van Eijk, P. Pavlopoulos, Marc Dejardin, V. Bertin, R. Ferreira-Marques, Mats Danielsson, R. Adler, P.F. Harrison, Ph. Schune, A. Ealet, C. Kochowski, B. Pagels, A. Go, Andrej Filipcic, H.U. Johner, Claude Guyot, A. Soares, C. Thibault, C. Eleftheriadis, G. Chardin, Jean-Louis Faure, D. Garreta, J. Kern, G. Backenstoss, Ch. Bula, M. Fidecaro, Panagiotis Kokkas, Stef. Charalambous, G. Polivka, P.-R. Kettle, Nikolaos Manthos, A. Liolios, Marcin Wladyslaw Wolter, J. Derre, F. Pelucchi, A. Angelopoulos, T. Lawry, E. Gabathuler, R. Rickenbach, J.C. Dousse, T. Alhalel, J. Pinto da Cunha, H.-J. Gerber, A. Onofre, W.G. Heyes, O. Wigger, J. K. Bienlein, and B.L. Roberts

Subjects
Physics, Nuclear physics, Correlation function (statistical mechanics), Particle physics, Pion, Physics and Astronomy (miscellaneous), Antiproton, Symmetrization, Elementary particle, Bose–Einstein correlations, Wave function, Engineering (miscellaneous), Exponential function
Abstract

Two-charged-pion correlations were studied in\(\bar p\)p(→2π*2π−nπ0,n≥0) annihilations at rest with the CPLEAR detector at the Low-Energy Antiproton Ring (LEAR). A strong enhancement was found in the production of pairs of like-sign pions with a small value of the relative fourmomentumQ, with respect to pairs of unlike-sign pions. The observed enhancement was interpreted as a consequence of the Bose-Einstein symmetrization of the two-pion wave function. The data are well represented by a correlation function parametrized as a double-Gaussian; an exponential parametrization is also statistically acceptable. The value of the correlation strength is found to be >1. The high-quality large data samples together with the ability for K± identification and final-state separation allowed the study of systematic effects impacting on theQ dependence of the correlation function and on the extracted space parameters of the pion sources.

Published
1994

7. Two pion Bose-Einstein correlations in p annihilations at rest

Author

G. Chardin, Jean-Louis Faure, D. Garreta, J. Kern, G. Backenstoss, C. Thibault, C. Eleftheriadis, Ch Yèche, Francois Touchard, B. Eckart, Stef. Charalambous, Christer Fuglesang, G. Polivka, J. Pinto da Cunha, H. Postma, K. Sarigiannis, Sp. Dedoussis, R. Le Gac, J. R. Fry, P. Gumplinger, Andras Kerek, J. Duclos, M. Dejardin, A. Go, Ph. Schune, M. Schafer, T. Ruf, M. Chardalas, A. Onofre, A. Soares, R. Kreuger, A. Ealet, Kerstin Jon-And, Christopher Bee, K. Jansson, Nikolaos Manthos, P. Pavlopoulos, Ioannis Evangelou, G. S. Varner, A. Liolios, A. Schopper, B.L. Roberts, P.J. Hayman, J.P. Miller, E. van Beveren, T. Nakada, R. Garnet, Ch. Bula, P.R. Kettle, L. Tauscher, C. Witzig, V. Bertin, W. Fetscher, E. Machado, O. Wigger, Elie Aslanides, J. K. Bienlein, M. Fidecaro, M. Van den Putte, A. Alhalel, J.C. Dousse, P. Fassnacht, S. Vlachos, O. Wolter, G. Marel, J. Bennet, E. Cawley, Marko Mikuz, A. Apostolakis, Mats Danielsson, D.A. Troester, H.-J. Gerber, R. Adler, Igor Mandić, Danilo Zavrtanik, E. Gabathuler, R. Rickenbach, D. Zimmerman, E. Rozaki, W.G. Heyes, C. Kochowski, P. Carlson, R. Ferreira-Marques, B. Pagels, David Francis, C.W.E. van Eijk, P. Sanders, S. Szilagyi, Theodoros Geralis, A. Angelopoulos, P.F. Harrison, A.J.P.L. Policarpo, P. Bloch, J. Derre, Panagiotis Kokkas, F. Pelucchi, P. Weber, C. Touramanis, R.W. Hollander, Frixos A Triantis, T. Lawry, L.A. Schaller, Claudio Santoni, Andrej Filipcic, H.U. Johner, João Carvalho, F. Montanet, Claude Guyot, C. Felder, M. Dodgson, P. Maley, L. Sakeliou, L. Faravel, and L. Sacks

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Pion, Large Hadron Collider, Nuclear Theory, Detector, High Energy Physics::Experiment, Bose–Einstein correlations, Multiplicity (chemistry), Nuclear Experiment
Abstract

Bose-Einstein (BE) correlations between like-sign charged pions were studied in pp annihilations at rest into four-prong events, using data taken with the CPLEAR detector at LEAR (CERN). A strong enhancement was found in the production of pairs of like-sign pions of similar momenta, with respect to the pairs of unlike-sign pions. The observed BE- enhancement was used to extract the values for the strength λ of the effect and the radius r of the pion emitting source. The extracted value of λ >l is of relevant importance and clearly does not depend on the assumed parametrization of the correlation function. The influence of the normalization and fitting procedure, the detector resolution, the resonances production and decay and the neutral-pion multiplicity cuts, on the size of the pion source and the strength of the effect was investigated.

Published
1993

8. First determination of CP violation parameters from K0−0 decay asymmetry

Author

S. Charalambous, D. Francis, T. Alhalel, P. Fassnacht, M. Dodgson, J. Bennet, R. Rickenbach, Claudio Santoni, K. Sarigiannis, João Carvalho, M. Van den Putte, F. Montanet, B. Eckart, C. Thibault, E. Gabathuler, E. Aslanides, A. Filipcic, T. Nakada, Marko Mikuz, Kerstin Jon-And, P Harrison, A. Schopper, F. Touchard, C. Touramanis, R. Ferreira-Marques, H. Cobbaert, H.-J. Gerber, P.-R. Kettle, E. van Beveren, P. Kokkas, J. R. Fry, S. Szilagyi, P.J. Hayman, Ch. Bula, G. Polivka, Ph. Schune, J. Duclos, W.G. Heyes, E. Rozaki, T. Geralis, W. Fetscher, A. Apostolakis, A. Ealet, A. Go, M. Fidecaro, P. Maley, L. Faravel, J.K. Bielein, T. Lawry, G. Varner, T. Ruf, P. Carlson, A. Onofre, J. Pinto Dacunha, P. Pavlopoulos, Christopher Bee, D. Zimmerman, K. Jansson, P. Sanders, S. Vlachos, Christer Fuglesang, C.W.E. Van Eijk, R. Adler, M. Chardalas, Andras Kerek, Marc Dejardin, G. Marel, L. Sacks, L.A. Schaller, F. Triantis, R. Le Gac, Claude Guyot, G. Burgun, A.J.P.L. Policarpo, E. Machado, J. Derre, P. Weber, F. Pelucchi, A. Angelopoulos, R. Kreuger, S. Dedoussis, D.A. Troster, P. Gumplinger, L. Sakeliou, C. Felder, J. Miller, N. Manthos, G. Chardin, Jean-Louis Faure, C. Yeche, D. Garreta, G. Backenstoss, M. Schafer, C. Witzig, R. Gamet, C. Kochowski, H.U. Johner, B. Pagels, L. Tauscher, J.-C. Dousse, H. Postma, D. Zavrtanik, J. Kern, P. Bloch, E. Cawley, R.W. Hollander, and U. Seljak

Subjects
Physics, Systematic error, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Value (computer science), Asymmetry, Nuclear physics, Pion, CP violation, High Energy Physics::Experiment, Direct proof, Nuclear Experiment, Bar (unit), media_common
Abstract

We report the first determination of CP violation parameters from parameter from particle—antiparticle asymmetry in the decay of neutral kaons into two charged pions. Observation of such an asymmetry is direct proof of CP violation. A fit to the asymmetry enabled a determination of the parameter η+− to be made, yielding the result |η+−|=[2.32±0.14 (stat.)±0.03 (syst.)]×10−3 and σ+−=42.3°±4.4° (stat.)±0.4° (syst.), with an additional uncertainty of ±1.0° due to the error on the present published value of Δm, the KL0-KS0 mass difference. The magnitudes of both statistical and systematic errors will be significantly reduced in the future.

Published
1992

9. The CPLEAR particle identification detector

Author

Stef. Charalambous, D. Warner, R. Rickenbach, Jeffrey Boone Miller, P. Pavlopoulos, H.-J. Gerber, R. Ferreira-Marques, F. Pelucchi, S. Szilagyi, F. Montanet, W. Fetcher, Christer Fuglesang, H. Cobbaert, A. Go, David Francis, Panagiotis Kokkas, E. Machado, T. Lawry, G. S. Varner, K. Jansson, E. Rozaki, J. Pinto da Cunha, G. Kesseler, Sp. Dedoussis, João Carvalho, K. Sarigiannis, B.L. Roberts, M. Wildi, A. Apostolakis, A. Onofre, G. Backenstoss, A. Angelopoulos, C. Touramanis, Frixos A Triantis, Patrick Fassnacht, L. Sakeliou, A.J.P.L. Policarpo, J Kuzminski, Kerstin Jon-And, D. Zimmerman, M. Chardalas, P. Carlson, and Andras Kerek

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Detector, Particle identification, Momentum, Nuclear physics, Pion, Antiproton, Physics::Accelerator Physics, CP violation, High Energy Physics::Experiment, Detectors and Experimental Techniques, Nuclear Experiment, Instrumentation, Beam (structure)
Abstract

The CPLEAR experiment will measure CP violation parameters in the neutral kaon system, using a low energy antiproton beam from the Low Energy Antiproton Ring (LEAR) at CERN. One of its subdetectors, the Particle Identification Detector (PID), makes a fast separation of pions and kaons, which is essential for the experiment. This article describes the design of the PID and its performance during beam tests and during initial runs at LEAR. A pion rejection efficiency of 99.7% for the first level trigger (after 60 ns) is found in the relevant momentum region.

Published
1992

10. Determination of the relative branching ratios for

Author

Philippe Bloch, Andrej Filipcic, Ch. Bula, Stef. Charalambous, D. Warner, J. Derre, A. Go, C. Felder, H.U. Johner, Claude Guyot, L. Sakeliou, T. Geralis, D.A. Troester, G. Backenstoss, H. Postma, E. van Beveren, T. Lawry, C.W.E. van Eijk, J.C. Dousse, David Francis, L. Tauscher, P. Fassnacht, L. Faravel, M. Fidecaro, E. Aslanides, J. Duclos, H.-J. Gerber, R. Kreuger, João Carvalho, G. Marel, C. Touramanis, Christer Fuglesang, W.G. Heyes, E. Kossionides, A. Apostolakis, L. Sacks, T. Paradelis, Frixos A Triantis, R. Le Gac, G. S. Varner, E. Machado, P. Weber, K. Jansson, K. Sarigiannis, L.A. Schaller, A. Onofre, J. R. Fry, J. Bennet, B.L. Roberts, T. Nakada, P. Marotte, Sp. Dedoussis, F. Montanet, A. Schopper, Christopher Bee, P.J. Hayman, P. Pavlopoulos, R. Gamet, Jean-Louis Faure, R. Ferreira-Marques, M. Dodgson, Panagiotis Kokkas, S. Szilagyi, P.F. Harrison, S. Vlachos, D. Garreta, J. Kern, T. Ruf, C. Burgun, M. Van den Putte, W. Fetscher, C. Thibault, E. Gabathuler, R. Rickenbach, Francois Touchard, M. Mikuž, P. Maley, A. Ealet, Danilo Zavrtanik, R.W. Hollander, Ch Yèche, B. Eckart, R. Adler, P. Sanders, M. Chardalas, C. Santoni, A.J.P.L. Policarpo, F. Pelucchi, C. Witzig, C. Kochowski, B. Pagels, Jeffrey Boone Miller, D. Zimmerman, J. Pinto da Cunha, P. Gumplinger, Per Carlson, Marc Dejardin, Andras Kerek, E. Rozaki, P.-R. Kettle, H. Cobbaert, A. Angelopoulos, Kerstin Jon-And, Nikolaos Manthos, Ph. Schune, and U. Seljak

Subjects
Physics, Nuclear and High Energy Physics, Pair production, Annihilation, Pion, Meson, Branching fraction, Antiproton, Protonium, Hadron, Analytical chemistry, Atomic physics
Abstract

The ratio of the branching fractions for p p →K+K− and p p →π+π− was determined with the CPLEAR detector, by stopping antiprotons in a gaseous hydrogen target at 15 bar pressure. It was found to be BR(K+K−)/BR(π+π−)=0.205± 0.016. The fraction of P-wave annihilation at rest at this target density was deduced to be (38±9)%.

Published
1991

11. Measurement of the $K_{L}-K_{S}$ mass difference using semileptonic decays of tagged neutral kaons

Author

D. Garreta, M. Mikuž, F. Touchard, L. Tauscher, Marc Dejardin, L. Faravel, J. Derre, F. Pelucchi, A. Benelli, E. Machado, T. Schietinger, M. Chardalas, M.B. Chertok, R. Le Gac, Jeffrey Boone Miller, C. Felder, P. Weber, E. Aslanides, C. Touramanis, Christer Fuglesang, T. Lawry, Frixos A Triantis, K. Sarigiannis, Christopher Bee, H. Postma, A. Cody, Sp. Dedoussis, J. R. Fry, T. Geralis, P. Fassnacht, R. Ferreira-Marques, Panagiotis Kokkas, Claudio Santoni, G. S. Varner, Ch Yèche, F. Henry-Couannier, B. Eckart, C. Witzig, B.L. Roberts, I. Mandić, T. Nakada, G. Backenstoss, L. Sacks, I. Papadopoulos, E. Hubert, A. Filipčič, F. Blanc, A. Haselden, João Carvalho, K. Jon-And, D.A. Troster, O. Wigger, C. Kochowski, J. Duclos, Ch. Bula, T. Alhalel, B. Pagels, C.W.E. van Eijk, M. Dodgson, V. Bertin, M. Schafer, A. Go, D. Zimmerman, E. van Beveren, J. K. Bienlein, R.W. Hollander, W. Fetscher, T. Ruf, F. Montanet, R. Gamet, E. Rozaki, Ph. Schune, A. Soares, K. Jansson, O. Behnke, H.-J. Gerber, M. Fidecaro, W.G. Heyes, Mats Danielsson, R. Adler, F. Leimgruber, A. Schopper, S. Vlachos, P. Sanders, C. Thibault, P Harrison, M. Wolter, P.J. Hayman, P. Maley, A. Liolios, L.A. Schaller, J. Bennet, E. Cawley, Ioannis Evangelou, D. Francis, P. Gumplinger, L. Sakeliou, A.J.P.L. Policarpo, N. Manthos, E. Gabathuler, R. Rickenbach, P. Pavlopoulos, R. Kreuger, A. Apostolakis, G. Marel, A. Ealet, Michael C. Carroll, D. Zavrtanik, P. Bloch, H.U. Johner, Claude Guyot, P.-R. Kettle, C. Eleftheriadis, A. Angelopoulos, J. Pinto da Cunha, A. Onofre, P. Carlson, G. Chardin, Jean-Louis Faure, Stef. Charalambous, and G. Polivka

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Full data, Particle Physics - Experiment
Abstract

We report on a new measurement of the K L –K S mass difference Δm using the CPLEAR full data sample of neutral-kaon decays to e πν . The result is Δm =(0.5295±0.0020 stat ±0.0003 syst )×10 10 ℏ/s. It includes earlier data reported in R. Adler et al., CPLEAR Collaboration, Phys. Lett. B 363 (1995) 237. A measurement of the ΔS = ΔQ violating parameter Re( x ) is also obtained.

Published
1998

12. First observation of a particle-antiparticle asymmetry in the decay of neutral kaons into $\pi^{0}\pi^{0}$

Author

L. Faravel, K. Sarigiannis, L. Sacks, Michael C. Carroll, V. Bertin, D.A. Troster, M. Schafer, J. Bennet, Panagiotis Kokkas, Igor Mandić, O. Behnke, F. Montanet, Christopher Bee, Jeffrey Boone Miller, Elie Aslanides, G. Marel, E. Cawley, P. Weber, Ch. Bula, J. Duclos, C. Thibault, T. Schietinger, M. Fidecaro, Patrick Fassnacht, T. Alhalel, F. Leimgruber, A. Schopper, T. Ruf, B. L. Roberts, P. Sanders, Marko Mikuz, J. Pinto da Cunha, P. Pavlopoulos, Ioannis Papadopoulos, K. Jansson, M. Dodgson, Lukas A. Schaller, W. Fetscher, P.R. Kettle, L. Tauscher, R. Kreuger, A. Benelli, C.W.E. van Eijk, Theodoros Geralis, E. Gabathuler, R. Rickenbach, Marc Dejardin, A. Apostolakis, G. S. Varner, R. Ferreira-Marques, P.J. Hayman, H.-J. Gerber, Francois Touchard, C. Touramanis, David Francis, Ph. Schune, Danilo Zavrtanik, A. Cody, Frixos A Triantis, Sotirios Vlachos, Sp. Dedoussis, C. Eleftheriadis, R. Gamet, A. Go, W.G. Heyes, T. Nakada, John R. Fry, A. Angelopoulos, F. Henry-Couannier, E. Rozaki, A. Soares, G. Chardin, Jean-Louis Faure, Christer Fuglesang, Claudio Santoni, A. Onofre, A.J.P.L. Policarpo, D. Garreta, G. Backenstoss, B. Eckart, João Carvalho, Stef. Charalambous, G. Polivka, C. Felder, R. Le Gac, Kerstin Jon-And, Nikolaos Manthos, C. Yeche, A. Liolios, Marcin Wladyslaw Wolter, O. Wigger, J. Derre, Eef van Beveren, T. Lawry, J. K. Bienlein, P. Bloch, A. Haselden, A. Ealet, R.W. Hollander, Mats Danielsson, R. Adler, M. Chardalas, M.B. Chertok, P. Maley, Ioannis Evangelou, P. Gumplinger, L. Sakeliou, E. Hubert, D. Zimmerman, P. Carlson, E. Machado, Paul Fraser Harrison, F. Blanc, C. Kochowski, Andrej Filipcic, H.U. Johner, B. Pagels, Claude Guyot, H. Postma, F. Pelucchi, and C. Witzig

Subjects
Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, media_common.quotation_subject, Hadron, Elementary particle, Strangeness, Asymmetry, Nuclear physics, Particle decay, Pion, CP violation, Particle Physics - Experiment, media_common
Abstract

CP violation has been observed as a time-dependent rate asymmetry between the decays ${⩈erline K}^0 ⌝ghtarrow ≪^{0} ≪^{0}$ and K0 → π0π{0}, where the neutral kaons are produced with definite and individually known strangeness in ${⋏r p}p ⌝ghtarrow{⩈erline K}^0 K^+≪^- $ or pp → K0 K− π+. A special technique for the data analysis has been developed. The values obtained for ϕ00 and ¦ η00¦ are in agreement with those of previous measurements of CP violation.

Published
1995

13. Measurement of K$_{L}$-K$_{S}$ mass difference using semileptonic decays of tagged neutral kaons

Author

R. Adler, T. Alhalel, A. Angelopoulos, A. Apostolakis, E. Aslanides, G. Backenstoss, C.P. Bee, O. Behnke, A. Benelli, J. Bennet, V. Bertin, J.K. Bienlein, F. Blanc, P. Bloch, C. Bula, P. Carlson, M. Carroll, J. Carvalho, E. Cawley, S. Charalambous, M. Chardalas, G. Chardin, M.B. Chertok, A. Cody, M. Danielsson, S. Dedoussis, M. Dejardin, J. Derre, M. Dodgson, J. Duclos, A. Ealet, B. Eckart, C. Eleftheriadis, I. Evangelou, L. Faravel, P. Fassnacht, J.L. Faure, C. Felder, R. Ferreira-Marques, W. Fetscher, M. Fidecaro, A. Filipčič, D. Francis, J. Fry, C. Fuglesang, E. Gabathuler, R. Gamet, D. Garreta, T. Geralis, H.-J. Gerber, A. Go, P. Gumplinger, C. Guyot, P.F. Harrison, A. Haselden, P.J. Hayman, F. Henry-Couannier, W.G. Heyes, R.W. Hollander, E. Hubert, K. Jansson, H.U. Johner, K. Jon-And, P.-R. Kettle, C. Kochowski, P. Kokkas, R. Kreuger, T. Lawry, R. Le Gac, F. Leimgruber, A. Liolios, E. Machado, P. Maley, I. Mandić, N. Manthos, G. Marel, M. Mikuž, J. Miller, F. Montanet, T. Nakada, A. Onofre, B. Pagels, I. Papadopoulos, P. Pavlopoulos, F. Pelucchi, J. Pinto da Cunha, A. Policarpo, G. Polivka, H. Postma, R. Rickenbach, B.L. Roberts, E. Rozaki, T. Ruf, L. Sacks, L. Sakeliou, P. Sanders, C. Santoni, K. Sarigiannis, M. Schäfer, L.A. Schaller, T. Schietinger, A. Schopper, P. Schune, A. Soares, L. Tauscher, C. Thibault, F. Touchard, C. Touramanis, F. Triantis, D.A. Tröster, E. Van Beveren, C.W.E. Van Eijk, G. Varner, S. Vlachos, P. Weber, O. Wigger, C. Witzig, M. Wolter, C. Yeche, D. Zavrtanik, and D. Zimmerman

Subjects
Nuclear and High Energy Physics, Particle Physics - Experiment
Published
1995

14. CP, T, and CPT tests in neutral Kaon decays using tagged K0, K0at LEAR

Author

L. Faravel, C.W.E. van Eijk, E. Hubert, K. Sarigiannis, T. Alhalel, O. Behnke, H.-J. Gerber, Danilo Zavrtanik, G. Marel, Sp. Dedoussis, Marcin Wladyslaw Wolter, J. Derre, F. Montanet, Christopher Bee, G. Chardin, Jean-Louis Faure, D. Zimmerman, T. Lawry, E. Cawley, V. Bertin, D.A. Troster, F. Leimgruber, R. Le Gac, P. Carlson, A. Schopper, E. van Beveren, F. Blanc, C. Kochowski, M. Mikuž, L. Sacks, D. Garreta, G. Backenstoss, M. Schafer, J. S. Miller, Ioannis Evangelou, B. Pagels, P.J. Hayman, Panagiotis Kokkas, P. Gumplinger, L. Sakeliou, E. Machado, Michael C. Carroll, Marc Dejardin, Stef. Charalambous, B. Eckart, J. R. Fry, H. Postma, Elie Aslanides, F. Pelucchi, J. Duclos, P.R. Kettle, L. Tauscher, G. Polivka, Patrick Fassnacht, Ch. Bula, C. Witzig, Ph. Schune, A. Onofre, Sotirios Vlachos, C. Touramanis, T. Ruf, R. Kreuger, Andrej Filipcic, P. Sanders, M. Fidecaro, A. Angelopoulos, W. Fetscher, Frixos A Triantis, T. Nakada, A. Go, K. Jansson, J. Pinto da Cunha, Kerstin Jon-And, Nikolaos Manthos, C. Thibault, A. Soares, B. L. Roberts, C. Eleftheriadis, C. Felder, A. Liolios, R. Gamet, H.U. Johner, Claudio Santoni, Claude Guyot, C. Yeche, T. Geralis, F. Henry-Couannier, Lukas A. Schaller, E. Rozaki, O. Wigger, Francois Touchard, J. Bennet, A.J.P.L. Policarpo, R. Ferreira-Marques, P. Weber, João Carvalho, David Francis, Igor Mandić, A. Cody, M. Dodgson, E. Gabathuler, R. Rickenbach, P. Maley, P. Pavlopoulos, A. Apostolakis, P. Bloch, A. Haselden, A. Ealet, R.W. Hollander, M. Chardalas, M.B. Chertok, Mats Danielsson, and R. Adler

Subjects
Nuclear physics, Physics, Particle physics, Large Hadron Collider, media_common.quotation_subject, Strangeness, Asymmetry, media_common
Abstract

The CPLEAR experiment at CERN measures particle‐antiparticle asymmetries of strangeness‐tagged K0, K0 decays to two‐pion, three‐pion, and semileptonic final states. The technique of CPLEAR is an alternative approach to previous CP‐violation studies. It provides complementary information with different systematics and gives access to novel measurements. The precision of the CP‐violation parameters η+− for π+π−, η+−0 for π+π−π0 and of the T‐violation parameter eT for π±e∓ν will be discussed for the data taken between 1990–1992.

Published
1995

15. A study of T violation via the semileptonic decays of neutral kaons in CPLEAR

Author

E. Gabathuler, Stef. Charalambous, R. Rickenbach, L. Tauscher, M. Mikuž, G. Polivka, P. Sanders, E. Machado, A.J.P.L. Policarpo, I. Evangelou, R. Ferreira-Marques, Panagiotis Kokkas, B. Eckart, S. Szilagyi, P.F. Harrison, E. Rozaki, Ph. Schune, P. Fassnacht, J. Bennet, C. Witzig, A. Ealet, A. Schopper, K. Sarigiannis, H. J. Johner, H. Postma, M. Van den Putte, Sp. Dedoussis, Andrej Filipcic, C. Thibault, A. Go, P. Bloch, T. Geralis, Danilo Zavrtanik, R. Gamet, C. Eleftheriadis, Elie Aslanides, A. Apostolakis, P.J. Hayman, Igor Mandić, R. Kreuger, L.A. Schaller, J. Duclos, B.L. Roberts, D. Zimmerman, Christopher Bee, P.-R. Kettle, Jeffrey Boone Miller, P. Carlson, Claude Guyot, Francois Touchard, V. Bertin, D.A. Troster, C. Felder, A. Soares, Mats Danielsson, R. Adler, Ch. Bula, T. Ruf, O. Wigger, C.W.E. van Eijk, Andras Kerek, M. Schafer, C. Yeche, J. Pinto da Cunha, G. Chardin, Jean-Louis Faure, W. Fetscher, K. Jansson, D. Garreta, J. Kern, C. Kochowski, J. K. Bienlein, G. Backenstoss, M. Fidecaro, J.C. Dousse, T. Alhalel, B. Pagels, C. Touramanis, M. Dejardin, Christer Fuglesang, Frixos A Triantis, E. van Beveren, R.W. Hollander, Kerstin Jon-And, P. Gumplinger, M. Chardalas, Nikolaos Manthos, R. Le Gac, H.-J. Gerber, A. Onofre, P. Pavlopoulos, A. Liolios, P. Maley, W.G. Heyes, A. Angelopoulos, Marcin Wladyslaw Wolter, J. Derre, F. Pelucchi, T. Lawry, S. Vlachos, G. Marel, E. Cawley, J. R. Fry, G. S. Varner, L. Sakeliou, L. Faravel, L. Sacks, P. Weber, Claudio Santoni, João Carvalho, F. Montanet, M. Dodgson, T. Nakada, David Francis, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], CP violation, 010306 general physics, 01 natural sciences
Abstract

The method for studying semileptonic neutral kaon decays at CPLEAR is presented together with a preliminary data analysis. For the first time a direct determination of T violation is shown to be possible and low statistics results are given. From the same data the K(L)-K(S) mass difference, DELTAm, the CP violation parameter of K(S), epsilon(S), and the parameter x testing the DELTAS = DELTAQ rule are also obtained. Nuclear Physics A

Published
1992

16. Recent results on CP violation from the CPLEAR experiment

Author

E. Rozaki, E. Aslanides, L. Faravel, Marc Dejardin, P. Weber, Christer Fuglesang, J. Derre, Nikolaos Manthos, P Harrison, R. Le Gac, E. Machado, Ch Yèche, B. Eckart, J. Pinto da Cunha, M. Chardalas, A. Liolios, H. Postma, T. Nakada, J. Duclos, D. Zimmerman, L. Sacks, C. Bula, G. Burgun, T. Ruf, R. Ferreira-Marques, J. Bennet, E. Gabathuler, P. Maley, C. Guyot, A. Apostolakis, V. Bertin, P.-R. Kettle, G. Backenstoss, F. Pelucchi, K. Jansson, F. Montanet, H.U. Johner, P. Fassnacht, A. Schopper, P. Gumplinger, Andras Kerek, S. Szilagyi, T. Lawry, A. Onofre, P.J. Hayman, Ludwig Tauscher, C. Felder, D.A. Troester, Mats Danielsson, R. Adler, C. Witzig, W. Fetscher, J.C. Dousse, T. Alhalel, O. Wigger, Ioannis Evangelou, C.W.E. van Eijk, M. W. Wolter, Theodoros Geralis, L. Sakeliou, A. Go, H.-J. Gerber, J. K. Bienlein, F. Touchard, Per Carlson, C. Touramanis, E. Cawley, C. Kochowski, Philippe Bloch, Frixos A Triantis, W.G. Heyes, A. Ealet, B. Pagels, J. Kern, R.W. Hollander, S. Dedoussis, David Francis, Ph. Schune, K. Jon-And, M. Mikuz, I. Mandić, Jeffrey Boone Miller, Sotirios Vlachos, M. Schafer, R. Gamet, A. Angelopoulos, L.A. Schaller, R. Kreuger, Claudio Santoni, G. Marel, A. Filipčič, João Carvalho, Danilo Zavrtanik, P. Sanders, S. Charalambous, A.J.P.L. Policarpo, G. Varner, M. Dodgson, C. Thibault, C. Eleftheriadis, Jean-Louis Faure, D. Garreta, G. Polivka, R.L. Roberts, K. Sarigiannis, J. R. Fry, P. Pavlopoulos, M. Van den Putte, Christopher Bee, R. Rickenbach, M. Fidecaro, Panagiotis Kokkas, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), Morales A., CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Antiparticle, Meson, 010308 nuclear & particles physics, Strangeness, 7. Clean energy, 01 natural sciences, Atomic and Molecular Physics, and Optics, Nuclear physics, Particle decay, Pair production, Pion, Antimatter, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], CP violation, High Energy Physics::Experiment, 010306 general physics
Abstract

The CPLEAR experiment is aiming at precise CP violation tests using initially pure K0- and K0BAR beams from the intense source provided by the annihilation of the LEAR pBAR-beam in hydrogen. The strangeness tagging efficiency and the systematic errors have been studied and found to be in agreement with the design specifications. The measurement of the differential time asymmetry of the pi+pi- decays allowed the direct observation of differences in the decay rates of particles and antiparticles.The CP violating parameters were determined as \eta+/-\ = (2.32 +/- 0.14) . 10(-3) and phi+/- = 42.3-degrees +/- 4.4-degrees. First results in the reconstruction and analysis of the neutral kaon decays into two neutral pions and the K(e)3 decay are presented. Nuclear Physics B

Published
1992

17. Recent results from the CP Lear experiment

Author

Andras Kerek, J. Pinto de Cunha, Christer Fuglesang, R. Gamet, Lukas A. Schaller, Claudio Santoni, W. Fetscher, G. Burgun, P. Weber, David Francis, J. R. Fry, G. S. Varner, J.C. Dousse, T. Alhalel, E. V. Van Beverin, P.R. Kettle, L. Tauscher, E. Gabathuler, R. Rickenbach, T. Nakada, H.-J. Gerber, R. Adler, J. Duclos, G. Chardin, Jean-Louis Faure, H. Cobbaert, João Carvalho, A. Apostolakis, W.G. Heyes, T. Ruf, D. Garreta, J. Kern, G. Backenstoss, A. Schopper, L. Faravel, K. Jansson, D. Zimmerman, Kerstin Jon-And, C. Thibault, P. Carlson, P.J. Hayman, J.P. Miller, Nikolaos Manthos, P. Sanders, B. L. Roberts, U. Seljak, R. Legac, Ph. Schune, Sp. Dedoussis, J. Derre, B. Eckart, R. Ferreira-Marques, A. Go, P. Gumplinger, M. Dodgson, S. Szilagyi, L. Sakeliou, Francois Touchard, Elie Aslanides, T. Lawry, Ch. Bula, Theodoros Geralis, Stef. Charalambous, D. Warner, L. Sacks, T. Paradelis, Sotirios Vlachos, A. Ealet, A. Angelopoulos, C. Touramanis, R.W. Hollander, M. Van den Putte, P. Pavlopoulos, Frixos A Triantis, Patrick Fassnacht, A. Onofre, M. Fidecaro, K. Sargiannis, P. Bloch, J. Bennet, Danilo Zavrtanik, Marko Mikuz, D.A. Troester, C.W.E. van Eijk, Panagiotis Kokkas, E. Machado, Paul Fraser Harrison, Andrej Filipcic, H.U. Johner, Claude Guyot, H. Postma, F. Pelucchi, C. Witzig, P. Maley, C. Kochowski, E. Kossianides, C. Felder, B. Pagels, C. Yeche, Marc Dejardin, E. Rozaki, A.J.P.L. Policarpo, F. Montanet, Christopher Bee, P. Marotte, R. Kreuger, G. Marel, and M. Chardalis

Subjects
Nuclear physics, Physics, Particle physics, Large Hadron Collider, Early results, Parametric analysis, CPT symmetry, media_common.quotation_subject, CP violation, Particle, High Energy Physics::Experiment, Asymmetry, media_common
Abstract

We describe the status of experiment PS195, which is under way on LEAR at CERN to study CP violation starting with pure K0 or K0 states. Early results on backgrounds and systematic effects agree with expectations from the original proposal. An asymmetry in particle‐anti‐particle partial decay rates has been seen for the first time.

Published
1992

18. Status of the CP LEAR experiment and first results

Author

P. Bloch, J. Duclos, P. Gumpliger, J. R. Fry, G. S. Varner, E. Kossionides, K. Jansson, G. Burgun, P. Weber, P. Pavlopoulos, L. Sakeliou, B. Eckart, H. Cobbaert, Lukas A. Schaller, Sp. Dedoussis, Marko Mikuz, A. Onofre, D.A. Troester, Kerstin Jon-And, E. Gabathuler, R. Rickenbach, L. Faravel, Nikolaos Manthos, Claudio Santoni, U. Seljak, R. Gamet, R. Ferreira-Marques, A. Go, P. Sanders, Jean-Louis Faure, C. Witzig, J. Pinto da Cunha, P. Carlson, Theodoros Geralis, G. Marel, Ch. Bula, D. Garreta, C. W. W. Van Eijk, S. Szilagyi, J. Kern, G. Backenstoss, D. Zimmerman, C. Fuglesang, M. Fidecaro, P.R. Kettle, L. Tauscher, A. Schopper, David Francis, F. Montanet, C. Thibault, C. B. Bee, B. L. Roberts, P.J. Hayman, A. Apostolakis, João Carvalho, H. J. Johner, Andras Kerek, R.W. Hollander, L. Sacks, C. Touramanis, W. Fetscher, T. Paradelis, Eef van Beveren, K. Sarigianis, T. Nakada, R. Le Gac, Francois Touchard, J. Derre, Frixos A Triantis, Stef. Charalambous, R. Adler, Panagiotis Kokkas, Sotirios Vlachos, T. Lawry, J.C. Dousse, H.-J. Gerber, W.G. Heyes, A. Angelopoulos, M. Chardalas, Danilo Zavrtanik, T. Ruf, J. Bennet, Patrick Fassnacht, Elie Aslanides, P. F. Harrison, M. Dodgson, E. Machado, C. Kochowski, Andrej Filipcic, B. Pagels, Claude Guyot, C. Felder, M. Van de Putte, H. Postma, F. Pelucchi, P. Maley, J. S. Miller, Marc Dejardin, E. Rozaki, A.J.P.L. Policarpo, P. Marotte, R. Kreuger, A. Ealet, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), CPLEAR, Damoiseaux, Magali, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Large Hadron Collider, Meson, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Detector, 01 natural sciences, Atomic and Molecular Physics, and Optics, 3. Good health, Nuclear physics, Moment (mathematics), Pair production, Antiproton, Antimatter, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, 010306 general physics
Abstract

The aim of the CP LEAR experiment is to study symmetry-violation effects, making use of tagged K0's and K0's. The detector, although missing some electronic components, has been operational for a few weeks at the end of 1989 at the CERN Low-Energy Antiproton Ring (LEAR). At the moment, the analysis of the data is in progress. This paper gives a description of the experimental method and of the detector; the sensitivities of some measurements and some preliminary results are also discussed.

Published
1990

19. Recent results of the CPLEAR experiment

Author

H. Postma, J.C. Dousse, T. Alhalel, H.-J. Gerber, W.G. Heyes, J. Duclos, B. Eckart, T. Ruf, K. Jansson, Marcin Wladyslaw Wolter, J. Derre, F. Pelucchi, T. Lawry, B.L. Roberts, Kerstin Jon-And, Nikolaos Manthos, A. Liolios, Jeffrey Boone Miller, P. Weber, R. Ferreira-Marques, S. Szilagyi, L. Sakeliou, P.F. Harrison, M. Chardalas, P. Gumplinger, Lukas A. Schaller, G. Chardin, Jean-Louis Faure, A. Go, J. Pinto da Cunha, Andras Kerek, P. Sanders, M. Van den Putte, D. Garreta, J. Kern, P. Bloch, Marko Mikuz, Ch. Bula, G. Backenstoss, Christopher Bee, P. Fassnacht, M. Dejardin, A. Apostolakis, A. Soares, W. Fetscher, P.J. Hayman, M. Fidecaro, A.J.P.L. Policarpo, David Francis, C.W.E. van Eijk, D. Zimmerman, P. Carlson, O. Wigger, Theodoros Geralis, A. Onofre, E. Gabathuler, E. Rozaki, R. Rickenbach, R. Kreuger, Christer Fuglesang, C. Touramanis, R. Gamet, R. Le Gac, Frixos A Triantis, V. Bertin, D.A. Troster, C. Witzig, J. R. Fry, R.W. Hollander, Panagiotis Kokkas, T. Nakada, G. S. Varner, J.K. Bielein, K. Sarigiannis, G. Marel, E. Cawley, J. Bennet, Elie Aslanides, Igor Mandić, Mats Danielsson, R. Adler, C. Thibault, P. Pavlopoulos, A. Angelopoulos, A. Schopper, C. Kochowski, C. Eleftheriadis, B. Pagels, S. Vlachos, Francois Touchard, E. van Beveren, Stef. Charalambous, Ph. Schune, A. Ealet, G. Polivka, L. Faravel, L. Sacks, M. Schafer, Claudio Santoni, Andrej Filipcic, João Carvalho, F. Montanet, I. Evangelou, H.U. Johner, Claude Guyot, P. Maley, P.R. Kettle, L. Tauscher, Danilo Zavrtanik, E. Machado, Sp. Dedoussis, M. Dodgson, C. Felder, C. Yeche, Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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), CPLEAR, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, 010308 nuclear & particles physics, 0103 physical sciences, Measure (physics), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 010306 general physics, 01 natural sciences
Abstract

The CPLEAR experiment at CERN has been designed to measure CP and T violating effects in the neutral kaon system by observing particle-antiparticle asymmetries. The motivation and the physics program of CPLEAR is presented and first analyses of the K0,K0BAR to pi+pi-, pi0pi0 and pi+pi-pi0 decays are discussed. Special emphasis is given to the recent results of the measurement of the CP violating parameters phi+- and eta+- based on first data taken in 1990/1991. Nuclear Physics A

20. First results from the CP lear experiment

Author

Sp. Dedoussis, H. Cobbaert, L. Faravel, H. Postma, F. Pelucchi, C. Fuglesang, E. Machado, A. Apostolakis, P.R. Kettle, L. Tauscher, C. B. Bee, Nikolaos Manthos, L. Sacks, T. Paradelis, U. Seljak, Andrej Filipcic, G. Burgun, J. Duclos, A. Ealet, G. Marel, P. Weber, P. Carlson, Patrick Fassnacht, K. Jansson, Claudio Santoni, P. Maley, Claude Guyot, P. F. Harrison, K. Sarigianis, T. Nakada, M. Van de Putte, P. Pavlopoulos, João Carvalho, J. R. Fry, E. Rozaki, G. S. Varner, A. Onofre, Lukas A. Schaller, M. Dodgson, A.J.P.L. Policarpo, C. Felder, David Francis, P. Marotte, K. Jon And, R. Kreuger, P. Sanders, J. S. Miller, Marc Dejardin, Danilo Zavrtanik, C. Thibault, B. L. Roberts, B. Eckart, R. Gamet, Francois Touchard, Stef. Charalambous, Jean-Louis Faure, D. Garreta, J. Kern, G. Backenstoss, Theodoros Geralis, A. Schopper, S. Szilagyi, P.J. Hayman, C. Touramanis, Frixos A Triantis, P. Gumpliger, D. Zimmerman, E. Kossionides, Marko Mikuz, D.A. Troester, L. Sakeliou, T. Ruf, Andras Kerek, J.C. Dousse, Elie Aslanides, H.-J. Gerber, W.G. Heyes, C. Witzig, R. Ferreira-Marques, J. Pinto da Cunha, F. Montanet, Ch. Bula, M. Fidecaro, W. Fetscher, M. Chardalas, R. Le Gac, J. Derre, Panagiotis Kokkas, T. Lawry, Sotirios Vlachos, A. Angelopoulos, P. Bloch, R.W. Hollander, J. Bennet, A. Go, C. Kochowski, B. Pagels, R. Adler, C. W. W. Van Eijk, E. Gabathuler, R. Rickenbach, E. van Beveren, and H. J. Johner

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, CP violation, High Energy Physics::Experiment, Direct proof, Asymmetry, Atomic and Molecular Physics, and Optics, media_common
Abstract

The observation of the K0, K 0 decay asymmetry is a direct proof of CP violation. In this paper preliminary experimental results obtained by studying the decays into π+π− are reported.

Catalog

Books, media, physical & digital resources
See catalog results