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21 results on '"Khomutov, N.V."'

2. Design, commissioning and performance of the PIBETA detector at PSI

Author

Frlež, E, Počanić, D, Assamagan, K.A, Bagaturia, Yu, Baranov, V.A, Bertl, W, Brönnimann, Ch, Bychkov, M, Crawford, J.F, Daum, M, Flügel, Th, Frosch, R, Horisberger, R, Kalinnikov, V.A, Karpukhin, V.V, Khomutov, N.V, Koglin, J.E, Korenchenko, A.S, Korenchenko, S.M, Kozlowski, T, Krause, B, Kravchuk, N.P, Kuchinsky, N.A, Li, W, Lawrence, D.W, Minehart, R.C, Mzhavia, D, Obermeier, H, Renker, D, Ritchie, B.G, Ritt, S, Sakhelashvili, T, Schnyder, R, Sidorkin, V.V, Slocum, P.L, Smith, L.C, Soić, N, Stephens, W.A, Supek, I, Tsamalaidze, Z, VanDevender, B.A, Wang, Y, Wirtz, H.P, and Ziock, K.O.H

Published
2004
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4. PEN: a low energy test of lepton universality

Author

Pocanic, Dinko, primary, Alonzi, L.P., additional, Baranov, V., additional, Bertl, W., additional, Bychkov, M., additional, Bystritsky, Yu.M., additional, Frlez, E., additional, Glaser, C.J., additional, Kalinnikov, V.A., additional, Khomutov, N.V., additional, Korenchenko, A.S., additional, Korenchenko, S.M., additional, Korolija, M., additional, Kozlowski, T., additional, Kravchuk, N.P., additional, Kuchinsky, N.A., additional, Lehman, M.C., additional, Mzhavia, D., additional, Palladino, A., additional, Robmann, P., additional, Rozhdestvensky, A.M., additional, Supek, I., additional, Truoel, P., additional, Van der Schaaf, Andries, additional, Velicheva, E.P., additional, Vitz, M.G., additional, and Volnykh, V.P., additional

Published
2017
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5. Spin asymmetry A1d and the spin-dependent structure function g1d of the deuteron at low values of x and Q2

Author

Alexakhin, V.Yu., Alexandrov, Yu., Alexeev, G.D., Amoroso, A., Badełek, B., Balestra, F., Ball, J., Baum, G., Bedfer, Y., Bernet, C., Bertini, R., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Bravar, A., Bressan, A., Brona, G., Burtin, E., Bussa, M.P., Chapiro, A., Cicuttin, A., Colantoni, M., Costa, S., Crespo, M.L., d'Hose, N., Dalla Torre, S., Dasgupta, S.S., De Masi, R., Denisov, O.Yu., Dhara, L., Diaz Kavka, V., Dinkelbach, A.M., Donskov, S.V., Dorofeev, V.A., Doshita, N., Duic, V., Dünnweber, W., Eversheim, P.D., Eyrich, W., Fabro, M., Faessler, M., Falaleev, V., Ferrero, A., Ferrero, L., Finger, M., Finger Jr., M., Fischer, H., Franz, J., Friedrich, J.M., Frolov, V., Garfagnini, R., Gautheron, F., Gavrichtchouk, O.P., Gerassimov, S., Geyer, R., Giorgi, M., Gobbo, B., Goertz, S., Gorin, A.M., Grajek, O.A., Grasso, A., Grube, B., Hannappel, J., von Harrach, D., Hasegawa, T., Heckmann, J., Hedicke, S., Heinsius, F.H., Hermann, R., Heß, C., Hinterberger, F., von Hodenberg, M., Horikawa, N., Horikawa, S., Ilgner, C., Ioukaev, A.I., Ishimoto, S., Ivanov, O., Iwata, T., Jahn, R., Janata, A., Joosten, R., Jouravlev, N.I., Kabuß, E., Kang, D., Ketzer, B., Khaustov, G.V., Khokhlov, Yu.A., Khomutov, N.V., Kisselev, Yu., Klein, F., Koblitz, S., Koivuniemi, J.H., Kolosov, V.N., Komissarov, E.V., Kondo, K., Königsmann, K., Konorov, I., Konstantinov, V.F., Korentchenko, A.S., Korzenev, A., Kotzinian, A.M., Koutchinski, N.A., Kravchuk, N.P., Kroumchtein, Z.V., Kuhn, R., Kunne, F., Kurek, K., Ladygin, M.E., Lamanna, M., Le Goff, J.M., Lichtenstadt, J., Liska, T., Ludwig, I., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G.K., Marchand, C., Marroncle, J., Martin, A., Marzec, J., Matsuda, T., Maximov, A.N., Meyer, W., Mielech, A., Mikhailov, Yu.V., Moinester, M.A., Nähle, O., Nassalski, J., Neliba, S., Neyret, D.P., Nikolaenko, V.I., Nozdrin, A.A., Obraztsov, V.F., Olshevsky, A.G., Ostrick, M., Padee, A., Pagano, P., Panebianco, S., Panzieri, D., Paul, S., Peshekhonov, D.V., Peshekhonov, V.D., Piragino, G., Platchkov, S., Pochodzalla, J., Polyakov, V.A., Popov, A.A., Pretz, J., Procureur, S., Quintans, C., Ramos, S., Reicherz, G., Rozhdestvensky, A.M., Rondio, E., Sadovski, A.B., Samoylenko, V.D., Sandacz, A., Sapozhnikov, M.G., Savin, I.A., Schiavon, P., Schill, C., Schmitt, L., Shevchenko, O.Yu., Shishkin, A.A., Siebert, H.-W., Sinha, L., Sissakian, A.N., Slunecka, M., Smirnov, G.I., Sozzi, F., Sugonyaev, V.P., Srnka, A., Stinzing, F., Stolarski, M., Sulc, M., Sulej, R., Takabayashi, N., Tchalishev, V.V., Tessarotto, F., Teufel, A., Tkatchev, L.G., Virius, M., Vlassov, N.V., Webb, R., Weise, E., Weitzel, Q., Windmolders, R., Wirth, S., Wiślicki, W., Zaremba, K., Zhao, J., Ziegler, R., and Zvyagin, A.

Subjects
Nuclear and High Energy Physics
Published
2007
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6. Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs

Author

Ageev, E.S., Alexakhin, V.Yu., Alexandrov, Yu., Alexeev, G.D., Amoroso, A., Badelek, B., Balestra, F., Ball, J., Baum, G., Bedfer, Y., Berglund, P., Bernet, C., Bertini, R., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Bravar, A., Bressan, A., Brona, G., Burtin, E., Bussa, M.P., Bytchkov, V.N., Cerini, L., Chapiro, A., Cicuttin, A., Colantoni, M., Colavita, A.A., Costa, S., Crespo, M.L., Dalla Torre, S., Dasgupta, S.S., Dedek, N., De Masi, R., Denisov, O.Yu., Dhara, L., Diaz, V., Dinkelbach, A.M., Dolgopolov, A.V., Donskov, S.V., Dorofeev, V.A., Doshita, N., Duic, V., Dünnweber, W., Ehlers, J., Eversheim, P.D., Eyrich, W., Fabro, M., Faessler, M., Falaleev, V., Fauland, P., Ferrero, A., Ferrero, L., Finger, M., Finger Jr., M., Fischer, H., Franz, J., Friedrich, J.M., Frolov, V., Garfagnini, R., Gautheron, F., Gavrichtchouk, O.P., Gerassimov, S., Geyer, R., Giorgi, M., Gobbo, B., Goertz, S., Gorin, A.M., Grajek, O.A., Grasso, A., Grube, B., Grünemaier, A., Hannappel, J., von Harrach, D., Hasegawa, T., Hedicke, S., Heinsius, F.H., Hermann, R., Heß, C., Hinterberger, F., von Hodenberg, M., Horikawa, N., Horikawa, S., d'Hose, N., Ijaduola, R.B., Ilgner, C., Ioukaev, A.I., Ishimoto, S., Ivanov, O., Iwata, T., Jahn, R., Janata, A., Joosten, R., Jouravlev, N.I., Kabuß, E., Kalinnikov, V., Kang, D., Karstens, F., Kastaun, W., Ketzer, B., Khaustov, G.V., Khokhlov, Yu.A., Khomutov, N.V., Kisselev, Yu., Klein, F., Koblitz, S., Koivuniemi, J.H., Kolosov, V.N., Komissarov, E.V., Kondo, K., Königsmann, K., Konoplyannikov, A.K., Konorov, I., Konstantinov, V.F., Korentchenko, A.S., Korzenev, A., Kotzinian, A.M., Koutchinski, N.A., Kowalik, K., Kravchuk, N.P., Krivokhizhin, G.V., Kroumchtein, Z.V., Kuhn, R., Kunne, F., Kurek, K., Ladygin, M.E., Lamanna, M., Leberig, M., Le Goff, J.M., Lichtenstadt, J., Liska, T., Ludwig, I., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G.K., Manuilov, I.V., Marchand, C., Marroncle, J., Martin, A., Marzec, J., Matsuda, T., Maximov, A.N., Medved, K.S., Meyer, W., Mielech, A., Mikhailov, Yu.V., Moinester, M.A., Nähle, O., Nassalski, J., Neliba, S., Neyret, D.P., Nikolaenko, V.I., Nozdrin, A.A., Obraztsov, V.F., Olshevsky, A.G., Ostrick, M., Padee, A., Pagano, P., Panebianco, S., Panzieri, D., Paul, S., Pereira, H.D., Peshekhonov, D.V., Peshekhonov, V.D., Piragino, G., Platchkov, S., Platzer, K., Pochodzalla, J., Polyakov, V.A., Popov, A.A., Pretz, J., Procureur, S., Quintans, C., Ramos, S., Rebourgeard, P.C., Reicherz, G., Reymann, J., Rith, K., Rondio, E., Rozhdestvensky, A.M., Sadovski, A.B., Saller, E., Samoylenko, V.D., Sandacz, A., Sans, M., Sapozhnikov, M.G., Savin, I.A., Schiavon, P., Schill, C., Schmidt, T., Schmitt, H., Schmitt, L., Shevchenko, O.Yu., Shishkin, A.A., Siebert, H.-W., Sinha, L., Sissakian, A.N., Skachkova, A., Slunecka, M., Smirnov, G.I., Sozzi, F., Srnka, A., Stinzing, F., Stolarski, M., Sugonyaev, V.P., Sulc, M., Sulej, R., Takabayashi, N., Tchalishev, V.V., Tessarotto, F., Teufel, A., Thers, D., Tkatchev, L.G., Toeda, T., Tretyak, V.I., Trousov, S., Varanda, M., Virius, M., Vlassov, N.V., Wagner, M., Webb, R., Weise, E., Weitzel, Q., Wiedner, U., Wiesmann, M., Windmolders, R., Wirth, S., Wiślicki, W., Zanetti, A.M., Zaremba, K., Zhao, J., Ziegler, R., and Zvyagin, A.

Subjects
Nuclear and High Energy Physics
Published
2006
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7. New precise measurement of the pion weak form factors in pi+ --> e+ nu gamma decay

Author

Bychkov, M., Počanić, Dinko, VanDevender, V.A., Baranov, V.A., Bertl, W., Bystritsky, Yu.M., Frlez, E., Kalinnikov, V.A., Khomutov, N.V., Korenchenko, A.S., Korenchenko, S.M., Korolija, Milorad, Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Mekterović, Darko, Mzhavia, D., Ritt, S., Robmann, P., Rondon-Aramayo, O.A., Rozhdestvensky, A.M., Sakhelashvili, T., Scheu, S., Straumann, U., Supek, Ivan, Tsamalaidze, Z., van der Schaaf, A., Velicheva, E.P., Volnykh, V.P., Wang, Y., and Wirtz, H.-P.

Subjects
pion, gamma decay
Abstract

We have measured the π+→e+νγ branching ratio over a wide region of phase space, based on a total of 65 460 events acquired using the PIBETA detector. Minimum-χ2 fits to the measured (Ee+, Eγ) energy distributions result in the weak form factor value of FA=0.0119(1) with a fixed value of FV=0.0259. An unconstrained fit yields FV=0.0258(17) and FA=0.0117(17). In addition, we have measured a=0.10(6) for the dependence of FV on q2, the e+ν pair invariant mass squared, parametrized as FV(q2)=FV(0)(1+aq2). The branching ratio for the kinematic region Eγ>10 MeV and θe+γ>40° is measured to be Bexpt=73.86(54)×10-8. Earlier deviations we reported in the high-Eγ–low-Ee+ kinematic region are resolved without a tensor term. We also derive new values for the pion polarizability αE=2.78(10)×10-4 fm3 and neutral pion lifetime τπ0=(8.5±1.1)×10-17 s.

Published
2009

8. Precise Measurement of pi+ -> e+ nu Branching Ratio

Author

Frlež, E., Alonzi, L.P., Baranov, V.A., Bertl, W., Bychkov, M., Bystritsky, Yu.M., Khomutov, N.V., Korenchenko, A.S., Korenchenko, S.M., Korolija, Milorad, Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Mekterović, Darko, Mzhavia, D., Palladino, A., Počanić, Dinko, Robmann, P., A.M. Rozhdestvensky, A.M., Sidorkin, V.V., Straumann, U., Supek, Ivan, Truöl, P., van der Schaaf, A., Velicheva, E.P., and Volnykh, V.P.

Subjects
pions, leptons, decay, High Energy Physics - Experiment
Abstract

The PEN Collaboration is conducting a new measurement of the pi+ -> e+ nu branching ratio at the Paul Scherrer Institute, with the goal uncertainty of delta B/B(pie2)=5E-4 or lower. At present, the combined accuracy of all published pie2 decay measurements lags behind the theoretical calculation by a factor of 40. In this contribution we report on the PEN detector configuration and its performance during two development runs done in 2007 and 2008., Comment: pdflatex, 11 pages, 5 figures, to be published in "Progress in High-Energy Physics and Nuclear Safety", NATO Science for Peace Series: B - Physics and Biophysics

Published
2008

9. New Precise Measurement of the Pion Weak Form Factors in the Pi+ -> e+ nu gamma Decay

Author

Bychkov, M., Počanić, Dinko, VanDevender, B.A., Baranov, V.A., Bertl, W., Bystritsky, Yu. M., Frlež, Emil, Kalinnikov, V.A., Khomutov, N.V., Korenchenko, N.S., Korenchenko, S.M., Korolija, Milorad, Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Mekterović, Darko, Mzhavia, D., Ritt, S., Robmann, P., Rondon-Aramayo, O.A., Rozhdestvensky, A.M., Sakhelashvili, T., Scheu, S., Straumann, U., Supek, Ivan, Tsamalaidze, Z., van der Schaaf, A., and Velicheva, E.P.

Subjects
New Precise Measurement
Abstract

We have measured the + ! e+ branching ratio over a wide region of phase space, based on a total of 65, 460 events acquired using the PIBETA detector. Minimum- 2 ts to the measured (Ee+ ; E) energy distributions result in the weak form factor value of FA = 0:0119(1) with a xed value of FV = 0:0259. An unconstrained t yields FV = 0:0258(17) and FA = 0:0117(17). In addition, we have measured a = 0:095 0:058 for the dependence of FV on the e+ pair invariant mass q2, parametrized as FV (q2) = FV (0)(1 + a q2). The branching ratio for the kinematic region E > 10MeV and e+ > 40 is measured to be Bexp = 73:86(54) 10

Published
2008

10. Spin asymmetry $A^d_1$ and the spin-dependent structure function $g^d_1$ of the deuteron at low values of $x$ and $Q^2$

Author

Ageev, E.S., Alexakhin, V.Yu., Alexandrov, Yu., Alexeev, G.D., Amoroso, A., Badelek, B., Balestra, F., Ball, J., Baum, G., Bedfer, Y., Berglund, P., Bernet, C., Bertini, R., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Bravar, A., Bressan, A., Burtin, E., Bussa, M.P., Bytchkov, V.N., Cerini, L., Chapiro, A., Cicuttin, A., Colantoni, M., Colavita, A.A., Costa, S., Crespo, M.L., d'Hose, N., Dalla Torre, S., Dasgupta, S.S., De Masi, R., Dedek, N., Denisov, O.Yu., Dhara, L., Diaz Kavka, V., Dinkelbach, A.M., Dolgopolov, A.V., Donskov, S.V., Dorofeev, V.A., Doshita, N., Duic, V., Dunnweber, W., Ehlers, J., Eversheim, P.D., Eyrich, W., Fabro, M., Faessler, M., Falaleev, V., Fauland, P., Ferrero, A., Ferrero, L., Finger, M., Finger, M., Jr., Fischer, H., Franz, J., Friedrich, J.M., Frolov, V., Fuchs, U., Garfagnini, R., Gautheron, F., Gavrichtchouk, O.P., Gerassimov, S., Geyer, R., Giorgi, M., Gobbo, B., Goertz, S., Gorin, A.M., Grajek, O.A., Grasso, A., Grube, B., Grunemaier, A., Hannappel, J., von Harrach, D., Hasegawa, T., Hedicke, S., Heinsius, F.H., Hermann, R., He, C., Hinterberger, F., von Hodenberg, M., Horikawa, N., Horikawa, S., Ijaduola, R.B., Ilgner, C., Ioukaev, A.I., Ishimoto, S., Ivanov, O., Iwata, T., Jahn, R., Janata, A., Joosten, R., Jouravlev, N.I., Kabuss, E., Kalinnikov, V., Kang, D., Karstens, F., Kastaun, W., Ketzer, B., Khaustov, G.V., Khokhlov, Yu.A., Khomutov, N.V., Kisselev, Yu., Klein, F., Koblitz, S., Koivuniemi, J.H., Kolosov, V.N., Komissarov, E.V., Kondo, K., Konigsmann, Kay, Konoplyannikov, A.K., Konorov, I., Konstantinov, V.F., Korentchenko, A.S., Korzenev, A., Kotzinian, A.M., Koutchinski, N.A., Kowalik, K., Kravchuk, N.P., Krivokhizhin, G.V., Kroumchtein, Z.V., Kuhn, R., Kunne, F., Kurek, K., Ladygin, M.E., Lamanna, M., Le Goff, J.M., Leberig, M., Lichtenstadt, J., Liska, T., Ludwig, I., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G.K., Manuilov, I.V., Marchand, C., Marroncle, J., Martin, A., Marzec, J., Matsuda, T., Maximov, A.N., Medved, K.S., Meyer, W., Mielech, A., Mikhailov, Yu.V., Moinester, M.A., Nahle, O., Nassalski, J., Neliba, S., Neyret, D.P., Nikolaenko, V.I., Nozdrin, A.A., Obraztsov, V.F., Olshevsky, A.G., Ostrick, M., Padee, A., Pagano, P., Panebianco, S., Panzieri, D., Paul, S., Pereira, H.D., Peshekhonov, D.V., Peshekhonov, V.D., Piragino, G., Platchkov, S., Platzer, K., Pochodzalla, J., Polyakov, V.A., Popov, A.A., Pretz, J., Quintans, C., Ramos, S., Rebourgeard, P.C., Reicherz, G., Reymann, J., Rith, K., Rozhdestvensky, A.M., Rondio, E., Sadovski, A.B., Saller, E., Samoylenko, V.D., Sandacz, A., Sans, M., Sapozhnikov, M.G., Savin, Igor A., Schiavon, P., Schill, C., Schmidt, T., Schmitt, H., Schmitt, L., Shevchenko, O.Yu., Shishkin, A.A., Siebert, H.-W., Sinha, L., Sissakian, A.N., Skachkova, A., Slunecka, M., Smirnov, G.I., Sozzi, F., Sugonyaev, V.P., Srnka, A., Stinzing, F., Stolarski, M., Sulc, M., Sulej, R., Takabayashi, N., Tchalishev, V.V., Tessarotto, F., Teufel, A., Thers, D., Tkatchev, L.G., Toeda, T., Tretyak, V.I., Trusov, Sergey V., Varanda, M., Virius, M., Vlassov, N.V., Wagner, M., Webb, R., Weise, E., Weitzel, Q., Wiedner, U., Wiesmann, M., Windmolders, R., Wirth, S., Wislicki, W., Zanetti, A.M., Zaremba, K., Zhao, J., Ziegler, R., and Zvyagin, A.

Subjects
Particle Physics - Experiment
Abstract

We present a precise measurement of the deuteron longitudinal spin asymmetry $A_1^d$ and of the deuteron spin-dependent structure function $g_1^d$ at $Q^2 < $ 1~(GeV/$c$)$^2$ and $4\cdot$10$^{-5} < x < $~2.5$\cdot$10$^{-2}$ based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured $A_1^d$ and $g_1^d$ are found to be consistent with zero in the whole range of $x$. We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.5*10^-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A_1^d and g_1^d are found to be consistent with zero in the whole range of x. We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.5*10^-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A_1^d and g_1^d are found to be consistent with zero in the whole range of x. We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.5*10^-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A_1^d and g_1^d are found to be consistent with zero in the whole range of x. We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.5*10^-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A_1^d and g_1^d are found to be consistent with zero in the whole range of x. We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.5*10^-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A_1^d and g_1^d are found to be consistent with zero in the whole range of x. We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.5*10^-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A_1^d and g_1^d are found to be consistent with zero in the whole range of x. We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.5*10^-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A_1^d and g_1^d are found to be consistent with zero in the whole range of x. We present a precise measurement of the deuteron longitudinal spin asymmetry A1d and of the deuteron spin-dependent structure function g1d at Q2

Published
2006

11. A new evaluation of the pion weak form factors

Author

Počanić, Dinko, Frlež, Emil, Baranov, V.A., Bertl, W., Bronnimann, Ch., Bychkov, M.: Crawford, J.F., Daum, M., Khomutov, N.V., Korenchenko, A.S., Korenchenko, S.M., Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Minehart, R.C., Mzhavia, D., Ritchie, B.G., Ritt, S., Rozhdestvensky, A.M., Sidorkin, V.V., Smith, L.C., Supek, Ivan, Tsamalaidze, Z., VanDevender, B.A., Wang, Y., Wirtz, H.-P., and Ziock, K.O.H.

Subjects
pion weak form factor, rare decays, radiative decay, High Energy Physics::Experiment
Abstract

We have used the PIBETA large-acceptance detector for a precise measurement of the pi+->e+nigama radiative decay at rest, with a broad phase space coverage. Using the CVC value for the pion vector form factor, F_V=0.0259(5), we have obtained a new value of the pion axial-vector form factor gamma=F_A/F_V=0.429(14). However, significant deviations from the SM predictions are evident in our data. The discrepancy can be accounted for by introducing a pion tensor form factor of F_T=-0.0016(3). The question of the true nature of the observed deviations remains open pending further theoretical and experimental study.

Published
2004

12. Precise measurement of the Pi+ -> Pi0 e+nu branching ratio

Author

Počanić, Dinko, Frlež, Emil, Baranov, V.A., Bertl, W., Bronnimann, Ch., Bychkov, M.: Crawford, J.F., Daum, M., Khomutov, N.V., Korenchenko, A.S., Korenchenko, S.M., Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Minehart, R.C., Mzhavia, D., Ritchie, B.G., Ritt, S., Rozhdestvensky, A.M., Sidorkin, V.V., Smith, L.C., Supek, Ivan, Tsamalaidze, Z., VanDevender, B.A., Wang, Y., Wirtz, H.-P., and Ziock, K.O.H.

Subjects
pion beta decay, branching ratio, Standard Model, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Using a large acceptance calorimeter and a stopped pion beam we have made a precise measurement of the rare Pi+ --> Pi0 e+ nu decay branching ratio. We have evaluated the branching ratio by normalizing the number of observed pion beta decays to the number of observed Pi+ --> e+ nu decays. We find the value of Gama(Pi+ --> Pi0 e+ nu)/Gama (total) = [1:036 +/- 0:004 (stat:) +/- 0:004 (syst:) +/- 0:003 ] x10-8, where the first uncertainty is statistical, the second systematic, and the third is the Pi+ -> e+ nu branching ratio uncertainty. Our result agrees well with the Standard Model prediction.

Published
2004

13. Absolute branching ratio normalization for rare pi^+ and mi^+ decay in the PIBETA experiment

Author

Frlez, E., Počanić, Dinko, Assamagan, K.A., Bagaturia, Yu., Baranov, V.A., Bertl, W., Bronnimann, Ch., Bychkov, M., Crawford, J.F., Daum, M., Flugel, Th., Frosch, R., Horisberger, R., Kalinnikov, V.A., Karpukhin, V.V., Khomutov, N.V., Koglin, J.E., Korenchenko, A.S., Korenchenko, S.M., Kozlowski, T., Krause, B., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Lawrence, D.W., Minehart, R.C., Mzhavia, D., Obermeier, H., Renker, D., Ritchie, B.G., Ritt, S., Sakhelashvili, T., Schnyder, R., Sidorkin, V.V., Slocum, P.L., Smith, L.C., Soić, Neven, Stephens, W.A., Supek, Ivan, Tsamalaidze, Z., VanDevender, B.A., Wang, Y., Wirtz H.P., and Ziock K.O.H.

Subjects
determination of CKM matrix elements, decays of pions and muons, properties of pions and muons
Abstract

We have used the PIBETA detector at the PSI for a precise measurement of rare pion and muon weak decays. We have collected a large statistic al sample of (1) pi+->e+ni_e, (2) pi+->pi0e+ni_e, (3) pi+->e+ni_egama, (4) pi+->e+ni_eni_mi, and (5) pi+->e+ni_eni_migama decays. We have evaluated the aboslute branching ratiosfor these processes by normalizing to the independently measured number of decaying pi+'s (or pi+'s). We discuss the mutual consistency of the preliminary results.

Published
2004

14. Precise measurement of the pion axial form factor in the pi^+ --> e^+ ni gamma decay

Author

Frlež, Emil, Počanić, Dinko, Baranov, V.A., Bertl, W., Bychkov, Khomutov, N.V., Korenchenko, A.S., Korenchenko, S.M., Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Minehart, R.C., Mzhavia, D., Ritchie, B.G., Ritt, S., Rozhdestvensky, A.M., Sidorkin, V.V., Smith, L.C., Supek, Ivan, Tsamalaidze, Z., VanDevender, B.A., Velicheva, E.P., Wang, Y., Wirtz, H.-P., and Ziock, K.O.H.

Subjects
pion beta decay, branching ratio, Standard Model
Abstract

We have studied radiative pion decays pi^+--e^+ni^gamma in three broad kinematic regions using the PIBETA detector and a stopped pion beam. Based on Dalitz distributions of 41 601 events we have evaluated absolute pi e ni^gamma branching ratios in the three regions. Minimum Ksi^2 fits to the integral and differential (Ee+, Egamma) distributions result in the axial-to-vector weak form factor ratio of gamma FA/FV = 0.443(15), or FA = 0.0115(4) with FV = 0.0259. However, deviations from standard model predictions in the high-Egamma– low-Ee+ kinematic region indicate the need for further theoretical and experimental work.

Published
2004

15. New results from the PIBETA experiment

Author

Počanić, Dinko, Frlež, Emil, Baranov, V.A., Bertl, W., Bronnimann, Ch., Bychkov, M.: Crawford, J.F., Daum, M., Khomutov, N.V., Korenchenko, A.S., Korenchenko, S.M., Kozlowski, T., Kravchuk, N.P., Kuchinsky, N.A., Li, W., Minehart, R.C., Mzhavia, D., Ritchie, B.G., Ritt, S., Rozhdestvensky, A.M., Sidorkin, V.V., Smith, L.C., Supek, Ivan, Tsamalaidze, Z., VanDevender, B.A., Wang, Y., Wirtz, H.-P., and Ziock, K.O.H.

Subjects
PIBETA experiment
Published
2003

16. Measurement of the spin structure of the deuteron in the DIS region

Author

Ageev, E.S., primary, Alexakhin, V.Yu., additional, Alexandrov, Yu., additional, Alexeev, G.D., additional, Amoroso, A., additional, Badełek, B., additional, Balestra, F., additional, Ball, J., additional, Baum, G., additional, Bedfer, Y., additional, Berglund, P., additional, Bernet, C., additional, Bertini, R., additional, Birsa, R., additional, Bisplinghoff, J., additional, Bordalo, P., additional, Bradamante, F., additional, Bravar, A., additional, Bressan, A., additional, Burtin, E., additional, Bussa, M.P., additional, Bytchkov, V.N., additional, Cerini, L., additional, Chapiro, A., additional, Cicuttin, A., additional, Colantoni, M., additional, Colavita, A.A., additional, Costa, S., additional, Crespo, M.L., additional, d'Hose, N., additional, Dalla Torre, S., additional, Dasgupta, S.S., additional, De Masi, R., additional, Dedek, N., additional, Denisov, O.Yu., additional, Dhara, L., additional, Diaz Kavka, V., additional, Dinkelbach, A.M., additional, Dolgopolov, A.V., additional, Donskov, S.V., additional, Dorofeev, V.A., additional, Doshita, N., additional, Duic, V., additional, Dünnweber, W., additional, Ehlers, J., additional, Eversheim, P.D., additional, Eyrich, W., additional, Fabro, M., additional, Faessler, M., additional, Falaleev, V., additional, Fauland, P., additional, Ferrero, A., additional, Ferrero, L., additional, Finger, M., additional, Fischer, H., additional, Franz, J., additional, Friedrich, J.M., additional, Frolov, V., additional, Fuchs, U., additional, Garfagnini, R., additional, Gautheron, F., additional, Gavrichtchouk, O.P., additional, Gerassimov, S., additional, Geyer, R., additional, Giorgi, M., additional, Gobbo, B., additional, Goertz, S., additional, Gorin, A.M., additional, Grajek, O.A., additional, Grasso, A., additional, Grube, B., additional, Grünemaier, A., additional, Hannappel, J., additional, von Harrach, D., additional, Hasegawa, T., additional, Hedicke, S., additional, Heinsius, F.H., additional, Hermann, R., additional, Heß, C., additional, Hinterberger, F., additional, von Hodenberg, M., additional, Horikawa, N., additional, Horikawa, S., additional, Ijaduola, R.B., additional, Ilgner, C., additional, Ioukaev, A.I., additional, Ishimoto, S., additional, Ivanov, O., additional, Iwata, T., additional, Jahn, R., additional, Janata, A., additional, Joosten, R., additional, Jouravlev, N.I., additional, Kabuß, E., additional, Kalinnikov, V., additional, Kang, D., additional, Karstens, F., additional, Kastaun, W., additional, Ketzer, B., additional, Khaustov, G.V., additional, Khokhlov, Yu.A., additional, Khomutov, N.V., additional, Kisselev, Yu., additional, Klein, F., additional, Koblitz, S., additional, Koivuniemi, J.H., additional, Kolosov, V.N., additional, Komissarov, E.V., additional, Kondo, K., additional, Königsmann, K., additional, Konoplyannikov, A.K., additional, Konorov, I., additional, Konstantinov, V.F., additional, Korentchenko, A.S., additional, Korzenev, A., additional, Kotzinian, A.M., additional, Koutchinski, N.A., additional, Kowalik, K., additional, Kravchuk, N.P., additional, Krivokhizhin, G.V., additional, Kroumchtein, Z.V., additional, Kuhn, R., additional, Kunne, F., additional, Kurek, K., additional, Ladygin, M.E., additional, Lamanna, M., additional, Le Goff, J.M., additional, Leberig, M., additional, Lichtenstadt, J., additional, Liska, T., additional, Ludwig, I., additional, Maggiora, A., additional, Maggiora, M., additional, Magnon, A., additional, Mallot, G.K., additional, Manuilov, I.V., additional, Marchand, C., additional, Marroncle, J., additional, Martin, A., additional, Marzec, J., additional, Matsuda, T., additional, Maximov, A.N., additional, Medved, K.S., additional, Meyer, W., additional, Mielech, A., additional, Mikhailov, Yu.V., additional, Moinester, M.A., additional, Nähle, O., additional, Nassalski, J., additional, Neliba, S., additional, Neyret, D.P., additional, Nikolaenko, V.I., additional, Nozdrin, A.A., additional, Obraztsov, V.F., additional, Olshevsky, A.G., additional, Ostrick, M., additional, Padee, A., additional, Pagano, P., additional, Panebianco, S., additional, Panzieri, D., additional, Paul, S., additional, Pereira, H.D., additional, Peshekhonov, D.V., additional, Peshekhonov, V.D., additional, Piragino, G., additional, Platchkov, S., additional, Platzer, K., additional, Pochodzalla, J., additional, Polyakov, V.A., additional, Popov, A.A., additional, Pretz, J., additional, Quintans, C., additional, Ramos, S., additional, Rebourgeard, P.C., additional, Reicherz, G., additional, Reymann, J., additional, Rith, K., additional, Rozhdestvensky, A.M., additional, Rondio, E., additional, Sadovski, A.B., additional, Saller, E., additional, Samoylenko, V.D., additional, Sandacz, A., additional, Sans, M., additional, Sapozhnikov, M.G., additional, Savin, I.A., additional, Schiavon, P., additional, Schill, C., additional, Schmidt, T., additional, Schmitt, H., additional, Schmitt, L., additional, Shevchenko, O.Yu., additional, Shishkin, A.A., additional, Siebert, H.-W., additional, Sinha, L., additional, Sissakian, A.N., additional, Skachkova, A., additional, Slunecka, M., additional, Smirnov, G.I., additional, Sozzi, F., additional, Sugonyaev, V.P., additional, Srnka, A., additional, Stinzing, F., additional, Stolarski, M., additional, Sulc, M., additional, Sulej, R., additional, Takabayashi, N., additional, Tchalishev, V.V., additional, Tessarotto, F., additional, Teufel, A., additional, Thers, D., additional, Tkatchev, L.G., additional, Toeda, T., additional, Tretyak, V.I., additional, Trousov, S., additional, Varanda, M., additional, Virius, M., additional, Vlassov, N.V., additional, Wagner, M., additional, Webb, R., additional, Weise, E., additional, Weitzel, Q., additional, Wiedner, U., additional, Wiesmann, M., additional, Windmolders, R., additional, Wirth, S., additional, Wiślicki, W., additional, Zanetti, A.M., additional, Zaremba, K., additional, Zhao, J., additional, Ziegler, R., additional, and Zvyagin, A., additional

Published
2005
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18. ARES — a spectrometer for the investigation of rare particle decays and rare nuclear processes

Author

Baranov, V.A., primary, Chernyavski, N.N., additional, Evtukhovich, P.G., additional, Filippov, A.I., additional, Fursov, A.P., additional, Glazov, A.A., additional, Khomutov, N.V., additional, Kisel, I.V., additional, Korenchenko, A.S., additional, Korenchenko, S.M., additional, Kostin, B.F., additional, Kravchuk, N.P., additional, Kuchinsky, N.A., additional, Moiseenko, A.S., additional, Mzhavia, D.A., additional, Nekrasov, K.G., additional, Povinec, P., additional, Szarka, J., additional, Smirnov, V.S., additional, Tsamalaidze, Z.B., additional, Vanko, J., additional, Yakovlev, S.I., additional, and Zyazyulya, F.E., additional

Published
1994
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19. Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs

Author

Ageev, E.S., Alexakhin, V.Yu., Alexandrov, Yu., Alexeev, G.D., Amoroso, A., Badelek, B., Balestra, F., Ball, J., Baum, G., Bedfer, Y., Berglund, P., Bernet, C., Bertini, R., Birsa, R., Bisplinghoff, J., Bordalo, P., Bradamante, F., Bravar, A., Bressan, A., Brona, G., Burtin, E., Bussa, M.P., Bytchkov, V.N., Cerini, L., Chapiro, A., Cicuttin, A., Colantoni, M., Colavita, A.A., Costa, S., Crespo, M.L., Dalla Torre, S., Dasgupta, S.S., Dedek, N., De Masi, R., Denisov, O.Yu., Dhara, L., Diaz, V., Dinkelbach, A.M., Dolgopolov, A.V., Donskov, S.V., Dorofeev, V.A., Doshita, N., Duic, V., Dünnweber, W., Ehlers, J., Eversheim, P.D., Eyrich, W., Fabro, M., Faessler, M., Falaleev, V., Fauland, P., Ferrero, A., Ferrero, L., Finger, M., Fischer, H., Franz, J., Friedrich, J.M., Frolov, V., Garfagnini, R., Gautheron, F., Gavrichtchouk, O.P., Gerassimov, S., Geyer, R., Giorgi, M., Gobbo, B., Goertz, S., Gorin, A.M., Grajek, O.A., Grasso, A., Grube, B., Grünemaier, A., Hannappel, J., von Harrach, D., Hasegawa, T., Hedicke, S., Heinsius, F.H., Hermann, R., Heß, C., Hinterberger, F., von Hodenberg, M., Horikawa, N., Horikawa, S., d'Hose, N., Ijaduola, R.B., Ilgner, C., Ioukaev, A.I., Ishimoto, S., Ivanov, O., Iwata, T., Jahn, R., Janata, A., Joosten, R., Jouravlev, N.I., Kabuß, E., Kalinnikov, V., Kang, D., Karstens, F., Kastaun, W., Ketzer, B., Khaustov, G.V., Khokhlov, Yu.A., Khomutov, N.V., Kisselev, Yu., Klein, F., Koblitz, S., Koivuniemi, J.H., Kolosov, V.N., Komissarov, E.V., Kondo, K., Königsmann, K., Konoplyannikov, A.K., Konorov, I., Konstantinov, V.F., Korentchenko, A.S., Korzenev, A., Kotzinian, A.M., Koutchinski, N.A., Kowalik, K., Kravchuk, N.P., Krivokhizhin, G.V., Kroumchtein, Z.V., Kuhn, R., Kunne, F., Kurek, K., Ladygin, M.E., Lamanna, M., Leberig, M., Le Goff, J.M., Lichtenstadt, J., Liska, T., Ludwig, I., Maggiora, A., Maggiora, M., Magnon, A., Mallot, G.K., Manuilov, I.V., Marchand, C., Marroncle, J., Martin, A., Marzec, J., Matsuda, T., Maximov, A.N., Medved, K.S., Meyer, W., Mielech, A., Mikhailov, Yu.V., Moinester, M.A., Nähle, O., Nassalski, J., Neliba, S., Neyret, D.P., Nikolaenko, V.I., Nozdrin, A.A., Obraztsov, V.F., Olshevsky, A.G., Ostrick, M., Padee, A., Pagano, P., Panebianco, S., Panzieri, D., Paul, S., Pereira, H.D., Peshekhonov, D.V., Peshekhonov, V.D., Piragino, G., Platchkov, S., Platzer, K., Pochodzalla, J., Polyakov, V.A., Popov, A.A., Pretz, J., Procureur, S., Quintans, C., Ramos, S., Rebourgeard, P.C., Reicherz, G., Reymann, J., Rith, K., Rondio, E., Rozhdestvensky, A.M., Sadovski, A.B., Saller, E., Samoylenko, V.D., Sandacz, A., Sans, M., Sapozhnikov, M.G., Savin, I.A., Schiavon, P., Schill, C., Schmidt, T., Schmitt, H., Schmitt, L., Shevchenko, O.Yu., Shishkin, A.A., Siebert, H.-W., Sinha, L., Sissakian, A.N., Skachkova, A., Slunecka, M., Smirnov, G.I., Sozzi, F., Srnka, A., Stinzing, F., Stolarski, M., Sugonyaev, V.P., Sulc, M., Sulej, R., Takabayashi, N., Tchalishev, V.V., Tessarotto, F., Teufel, A., Thers, D., Tkatchev, L.G., Toeda, T., Tretyak, V.I., Trousov, S., Varanda, M., Virius, M., Vlassov, N.V., Wagner, M., Webb, R., Weise, E., Weitzel, Q., Wiedner, U., Wiesmann, M., Windmolders, R., Wirth, S., Wiślicki, W., Zanetti, A.M., Zaremba, K., Zhao, J., Ziegler, R., and Zvyagin, A.

Subjects
Spin, Polarization, Asymmetry, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, Deep inelastic scattering, Nucleon, Gluon
Abstract

We present a determination of the gluon polarization Delta G/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q^2 = 0.002 +- 0.019(stat.) +- 0.003(syst.). From this value, we obtain in a leading-order QCD analysis Delta G/G=0.024 +- 0.089(stat.) +- 0.057(syst.) at x_g = 0.095 and mu^2 =~ 3 (GeV}/c)^2. We present a determination of the gluon polarization Delta G/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q^2 = 0.002 +- 0.019(stat.) +- 0.003(syst.). From this value, we obtain in a leading-order QCD analysis Delta G/G=0.024 +- 0.089(stat.) +- 0.057(syst.) at x_g = 0.095 and mu^2 =~ 3 (GeV}/c)^2. We present a determination of the gluon polarization Delta G/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q^2 = 0.002 +- 0.019(stat.) +- 0.003(syst.). From this value, we obtain in a leading-order QCD analysis Delta G/G=0.024 +- 0.089(stat.) +- 0.057(syst.) at x_g = 0.095 and mu^2 =~ 3 (GeV}/c)^2. We present a determination of the gluon polarization Delta G/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q^2 = 0.002 +- 0.019(stat.) +- 0.003(syst.). From this value, we obtain in a leading-order QCD analysis Delta G/G=0.024 +- 0.089(stat.) +- 0.057(syst.) at x_g = 0.095 and mu^2 =~ 3 (GeV}/c)^2. We present a determination of the gluon polarization Delta G/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q^2 = 0.002 +- 0.019(stat.) +- 0.003(syst.). From this value, we obtain in a leading-order QCD analysis Delta G/G=0.024 +- 0.089(stat.) +- 0.057(syst.) at x_g = 0.095 and mu^2 =~ 3 (GeV}/c)^2. We present a determination of the gluon polarization Delta G/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q^2 = 0.002 +- 0.019(stat.) +- 0.003(syst.). From this value, we obtain in a leading-order QCD analysis Delta G/G=0.024 +- 0.089(stat.) +- 0.057(syst.) at x_g = 0.095 and mu^2 =~ 3 (GeV}/c)^2. We present a determination of the gluon polarization ΔG/G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q2

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20. Ares spectrometer

Author

Baranov, V.A., primary, Evtukhovich, P.G., additional, Filippov, A.I., additional, Fursov, A.P., additional, Korenchenko, A.S., additional, Korenchenko, S.M., additional, Kostin, B.F., additional, Kravchuk, N.P., additional, Khomutov, N.V., additional, Kuchinsky, N.A., additional, Moiseenko, A.S., additional, Mzhavia, D.A., additional, Nekrasov, K.G., additional, Povinec, P., additional, Szarka, J., additional, Smirnov, V.S., additional, Vanko, J., additional, and Zyazyulya, F.E., additional

Published
1986
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21. Design, commissioning and performance of the PIBETA detector at PSI

Author

Frleǽ, E., Počanić, D., Assamagan, K.A., Bagaturia, Yu., Baranov, V.A., Bertl, W., Brönnimann, Ch., Bychkov, M., Crawford, J.F., Daum, M., Flügel, Th., Frosch, R., Horisberger, R., Kalinnikov, V.A., Karpukhin, V.V., Khomutov, N.V., Koglin, J.E., Korenchenko, A.S., Korenchenko, S.M., and Kozlowski, T.

Subjects
*DETECTORS, *ENGINEERING instruments, *CALORIMETERS, *CALIBRATION
Abstract

We describe the design, construction and performance of the PIBETA detector built for the precise measurement of the branching ratio of pion beta decay, π+→π0e+νe, at the Paul Scherrer Institute. The central part of the detector is a 240-module spherical pure CsI calorimeter covering ∼3π sr solid angle. The calorimeter is supplemented with an active collimator/beam degrader system, an active segmented plastic target, a pair of low-mass cylindrical wire chambers and a 20-element cylindrical plastic scintillator hodoscope. The whole detector system is housed inside a temperature-controlled lead brick enclosure, which in turn is lined with cosmic muon plastic veto counters. Commissioning and calibration data were taken during two 3-month beam periods in 1999/2000 with π+ stopping rates between 1.3·103 π+/s and 1.3·106 π+/s. We examine the timing, energy and angular detector resolution for photons, positrons and protons in the energy range of 5–150 MeV, as well as the response of the detector to cosmic muons. We illustrate the detector signatures for the assorted rare pion and muon decays and their associated backgrounds. [Copyright &y& Elsevier]

Published
2004
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