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7 results on '"Laukhin, I. V."'

1. Measurement of eta meson decays into lepton-antilepton pairs

Author

Collaboration, CELSIUS/WASA, Berłowski, M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Calén, H., Cappellaro, F., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gerén, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kupść, A., Kuzmin, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Schönning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegnér, P. -E., Engblom, P. Thörngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Złomańczuk, J.

Subjects
High Energy Physics - Experiment
Abstract

A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta->e+e-e+e- events are reported with a background of 1.3+/-0.2 events. This allows to set an upper limit to the branching ratio of 9.7E-5 (90% CL). The branching ratio for the decay eta->e+e-gamma is determined to (7.8+/-0.5 stat+/-0.8 syst)E-3. An upper limit (90% CL) for the branching ratio for the eta->e+e- decay is 2.7E-5 and a limit for the sum of the eta->mu+mu-mu+mu- and eta->pi+pi-mu+mu- decays is 3.6E-4., Comment: 9 pages, 10 Postscript figures, uses revtex4.sty, revised version after referee comments; conclusions unchanged

Published
2007
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2. Measurement of the eta->pi+pi-e+e- decay branching ratio

Author

Collaboration, CELSIUS-WASA, Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Calén, H., Capellaro, F., Clement, H., Demirörs, L., Ekström, C., Fransson, K., Gerén, L., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kupsc, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Schönning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegnér, P. -E., Engblom, P. Thörngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Złomańczuk, J.

Subjects
High Energy Physics - Experiment
Abstract

The reaction pd->3He eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta->pi+pi-e+e- is measured to be (4.3+/-1.3+/-0.4)x10^-4., Comment: 10 pages,6 figures revised version

Published
2006
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3. Measurement of eta meson decays into lepton-antilepton pairs

Author

WASA Collaboration, Ber��owski, M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Cal��n, H., Cappellaro, F., Clement, H., Demir��rs, L., Ekstr��m, C., Fransson, K., Ger��n, L., Gustafsson, L., H��istad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kup����, A., Kuzmin, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Povtorejko, A., Ruber, R. J. M. Y., Sch��nning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegn��r, P. -E., Engblom, P. Th��rngren, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Z��oma��czuk, J.

Subjects
Nuclear and High Energy Physics, Particle physics, Meson, Nuclear Theory, decay modes [eta], Dalitz plot, FOS: Physical sciences, Electron, Particle identification, exclusive reaction [p deuteron], High Energy Physics - Experiment, Nuclear physics, Particle decay, High Energy Physics - Experiment (hep-ex), pair production [lepton], +helium-3+eta%22">p deuteron --> helium-3 eta, +2lepton%2B+2lepton%22">eta --> 2lepton+ 2lepton, ddc:530, +2positron+2electron%22">eta --> 2positron 2electron, semileptonic decay [eta], Nuclear Experiment, 0.893 GeV, +pi%2B+pi-+muon%2B+muon%22">eta --> pi+ pi- muon+ muon, branching ratio [eta], Physics, hadroproduction [eta], experimental results [magnetic spectrometer], leptonic decay [eta], Branching fraction, High Energy Physics::Phenomenology, Eta meson, +positron+electron%22">eta --> positron electron, Uppsala CELSIUS Stor, +2muon%2B+2muon%22">eta --> 2muon+ 2muon, High Energy Physics::Experiment, +positron+electron+photon%22">eta --> positron electron photon, upper limit, Lepton, experimental results
Abstract

A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta->e+e-e+e- events are reported with a background of 1.3+/-0.2 events. This allows to set an upper limit to the branching ratio of 9.7E-5 (90% CL). The branching ratio for the decay eta->e+e-gamma is determined to (7.8+/-0.5 stat+/-0.8 syst)E-3. An upper limit (90% CL) for the branching ratio for the eta->e+e- decay is 2.7E-5 and a limit for the sum of the eta->mu+mu-mu+mu- and eta->pi+pi-mu+mu- decays is 3.6E-4., 9 pages, 10 Postscript figures, uses revtex4.sty, revised version after referee comments; conclusions unchanged

Published
2007
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4. Measurement of the eta->pi+pi-e+e- decay branching ratio

Author

Bargholtz, C., Bashkanov, M., Gustafsson, L., Höistad, B., Ivanov, G., Jacewicz, M., Jiganov, E., Johansson, T., Keleta, S., Koch, I., Kullander, S., Kupsc, A., Bogoslawsky, D., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, P., Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, H., Petukhov, Y., Calen, H., Povtorejko, A., Ruber, R.J.M.Y., Schönning, K., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Cappellaro, F., Tegner, P. E., Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., Zlomanczuk, J., Clement, H., CELSIUS-WASA, Coll., Demirörs, L., Ekström, C., Fransson, K., and Geren, L.

Subjects
hadroproduction [eta], dalitz decays, 0.893 GeV-kin, exclusive reaction [p deuteron], (pi+ pi- positron electron) [mass spectrum], Uppsala CELSIUS Stor, High Energy Physics - Experiment, pair production [pi], +helium-3+eta%22">p deuteron --> helium-3 eta, ddc:530, High Energy Physics::Experiment, pair production [electron], eta meson decays, semileptonic decay [eta], +pi%2B+pi-+positron+electron%22">eta --> pi+ pi- positron electron, experimental results [magnetic detector], Nuclear Experiment, Astrophysics::Galaxy Astrophysics, branching ratio [eta]
Abstract

The reaction pd->3He eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta->pi+pi-e+e- is measured to be (4.3+/-1.3+/-0.4)x10^-4., Comment: 10 pages,6 figures revised version

Published
2006

5. Measurement of eta meson decays into lepton-antilepton pairs

Author

Berlowski, M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Calén, Hans, Cappellaro, Filippo, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Berlowski, M., Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Bondar, A., Calén, Hans, Cappellaro, Filippo, Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Koch, Inken, Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Henrik, Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P. -E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, M., Yamamoto, A., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef

Abstract

A search for rare lepton decays of the eta meson was performed using the WASA detector at CELSIUS. Two candidates for double Dalitz decay eta -> e(+)e(-)e(+)e(-) events are reported with a background of 1.3 +/- 0.2 events. This allows to set an upper limit to the branching ratio of 9.7x10(-5) (90% CL). The branching ratio for the decay eta -> e(+)e(-)gamma is determined to (7.8 +/- 0.5(stat)+/- 0.8(syst))x10(-3) in agreement with world average value. An upper limit (90% CL) for the branching ratio for the eta -> e(+)e(-) decay is 2.7x10(-5) and a limit for the sum of the eta ->mu(+)mu(-)mu(+)mu(-) and eta ->pi(+)pi(-)mu(+)mu(-) decays is 3.6x10(-4).

Published
2008
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6. Measurement of the eta -> pi(+)pi(-)e(+)e(-) decay branching ratio

Author

Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, F., Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell E., Gerén, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Koch, I., Kullander, Sven O., Kupsc, Andrzej, Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Hanna I., Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegner, P. -E, Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zartova, I., Zlomanczuk, Jozef, Bargholtz, Chr., Bashkanov, M., Bogoslawsky, D., Calén, Hans, Cappellaro, F., Clement, H., Demiroers, L., Ekström, Curt, Fransson, Kjell E., Gerén, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, S. Negasi, Koch, I., Kullander, Sven O., Kupsc, Andrzej, Kuznetsov, A., Laukhin, I. V., Lindberg, K., Marciniewski, Pawel, Meier, R., Morosov, B., Oelert, W., Pauly, C., Pettersson, Hanna I., Petukhov, Y., Povtorejko, A., Ruber, Roger J. M. Y., Schönning, Karin, Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tchernyshev, V., Tegner, P. -E, Thörngren-Engblom, P., Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wolke, Magnus, Yamamoto, A., Zabierowski, J., Zartova, I., and Zlomanczuk, Jozef

Abstract

The reaction pd -> He-3 eta at threshold was used to provide a clean source of eta mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay eta -> pi(+)pi(-)e(+)e(-) is measured to be (4.3 +/- 1.3 +/- 0.4) x 10(-4).

Published
2007
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7. Properties of the WASA pellet target and a stored intermediate-energy beam

Author

Bargholtz, Chr., Geren, L., Kupsc, Andrzej, Laukhin, I. V., Lindberg, K., Shafigullin, R .R., Tegner, P. -E., Zartova, I., Bargholtz, Chr., Geren, L., Kupsc, Andrzej, Laukhin, I. V., Lindberg, K., Shafigullin, R .R., Tegner, P. -E., and Zartova, I.

Abstract

Experimental data from the reaction close to threshold have been used to investigate time-dependent properties of the WASA pellet target and the stored beam of 892.8 MeV protons in the CELSIUS accelerator. The detection of 3He ions in solid-state detectors provides an excellent almost background free trigger for η production. Pellet interactions with the surrounding material and with the beam lead to evaporation of deuterium gas into the beam pipe. Approximately 30% of the registered η decay events are due to interactions in deuterium gas outside the pellets. Due to beam–target interaction the beam is transversely heated and appears to acquire a component of a slightly lower energy.

Published
2007
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