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Start Over Author "Grabmüller S" Journal physical review letters
5 results on '"Grabmüller S"'

1. First Measurement of Chiral Dynamics inπ−γ→π−π−π+

Author

Adolph, C., primary, Alekseev, M. G., additional, Alexakhin, V. Yu., additional, Alexandrov, Yu., additional, Alexeev, G. D., additional, Amoroso, A., additional, Antonov, A. A., additional, Austregesilo, A., additional, Badełek, B., additional, Balestra, F., additional, Barth, J., additional, Baum, G., additional, Bedfer, Y., additional, Bernhard, J., additional, Bertini, R., additional, Bettinelli, M., additional, Bicker, K. A., additional, Birsa, R., additional, Bisplinghoff, J., additional, Bordalo, P., additional, Bradamante, F., additional, Braun, C., additional, Bravar, A., additional, Bressan, A., additional, Burtin, E., additional, Chaberny, D., additional, Chiosso, M., additional, Chung, S. U., additional, Cicuttin, A., additional, Crespo, M. L., additional, Dalla Torre, S., additional, Das, S., additional, Dasgupta, S. S., additional, Denisov, O. Yu., additional, Dhara, L., additional, Donskov, S. V., additional, Doshita, N., additional, Duic, V., additional, Dünnweber, W., additional, Dziewiecki, M., additional, Efremov, A., additional, Elia, C., additional, Eversheim, P. D., additional, Eyrich, W., additional, Faessler, M., additional, Ferrero, A., additional, Filin, A., additional, Finger, M., additional, Fischer, H., additional, Franco, C., additional, du Fresne von Hohenesche, N., additional, Friedrich, J. M., additional, Garfagnini, R., additional, Gautheron, F., additional, Gavrichtchouk, O. P., additional, Gazda, R., additional, Gerassimov, S., additional, Geyer, R., additional, Giorgi, M., additional, Gnesi, I., additional, Gobbo, B., additional, Goertz, S., additional, Grabmüller, S., additional, Grasso, A., additional, Grube, B., additional, Gushterski, R., additional, Guskov, A., additional, Haas, F., additional, von Harrach, D., additional, Hasegawa, T., additional, Heinsius, F. H., additional, Herrmann, F., additional, Hess, C., additional, Hinterberger, F., additional, Horikawa, N., additional, Höppner, Ch., additional, d’Hose, N., additional, Huber, S., additional, Ishimoto, S., additional, Ivanov, O., additional, Ivanshin, Yu., additional, Iwata, T., additional, Jahn, R., additional, Jasinski, P., additional, Jegou, G., additional, Joosten, R., additional, Kabuss, E., additional, Kang, D., additional, Ketzer, B., additional, Khaustov, G. V., additional, Khokhlov, Yu. A., additional, Kisselev, Yu., additional, Klein, F., additional, Klimaszewski, K., additional, Koblitz, S., additional, Koivuniemi, J. H., additional, Kolosov, V. N., additional, Kondo, K., additional, Königsmann, K., additional, Konorov, I., additional, Konstantinov, V. F., additional, Korzenev, A., additional, Kotzinian, A. M., additional, Kouznetsov, O., additional, Krämer, M., additional, Kroumchtein, Z. V., additional, Kunne, F., additional, Kurek, K., additional, Lauser, L., additional, Lednev, A. A., additional, Lehmann, A., additional, Levorato, S., additional, Lichtenstadt, J., additional, Maggiora, A., additional, Magnon, A., additional, Makke, N., additional, Mallot, G. K., additional, Mann, A., additional, Marchand, C., additional, Martin, A., additional, Marzec, J., additional, Massmann, F., additional, Matsuda, T., additional, Meyer, W., additional, Michigami, T., additional, Mikhailov, Yu. V., additional, Moinester, M. A., additional, Morreale, A., additional, Mutter, A., additional, Nagaytsev, A., additional, Nagel, T., additional, Nerling, F., additional, Neubert, S., additional, Neyret, D., additional, Nikolaenko, V. I., additional, Nowak, W.-D., additional, Nunes, A. S., additional, Olshevsky, A. G., additional, Ostrick, M., additional, Padee, A., additional, Panknin, R., additional, Panzieri, D., additional, Parsamyan, B., additional, Paul, S., additional, Perevalova, E., additional, Pesaro, G., additional, Peshekhonov, D. V., additional, Piragino, G., additional, Platchkov, S., additional, Pochodzalla, J., additional, Polak, J., additional, Polyakov, V. A., additional, Pontecorvo, G., additional, Pretz, J., additional, Quintans, C., additional, Rajotte, J.-F., additional, Ramos, S., additional, Rapatsky, V., additional, Reicherz, G., additional, Richter, A., additional, Rocco, E., additional, Rondio, E., additional, Rossiyskaya, N. S., additional, Ryabchikov, D. I., additional, Samoylenko, V. D., additional, Sandacz, A., additional, Sapozhnikov, M. G., additional, Sarkar, S., additional, Savin, I. A., additional, Sbrizzai, G., additional, Schiavon, P., additional, Schill, C., additional, Schlüter, T., additional, Schmitt, L., additional, Schönning, K., additional, Schopferer, S., additional, Schröder, W., additional, Shevchenko, O. Yu., additional, Siebert, H.-W., additional, Silva, L., additional, Sinha, L., additional, Sissakian, A. N., additional, Slunecka, M., additional, Smirnov, G. I., additional, Sosio, S., additional, Sozzi, F., additional, Srnka, A., additional, Stolarski, M., additional, Sulc, M., additional, Sulej, R., additional, Sznajder, P., additional, Takekawa, S., additional, Ter Wolbeek, J., additional, Tessaro, S., additional, Tessarotto, F., additional, Teufel, A., additional, Tkatchev, L. G., additional, Uhl, S., additional, Uman, I., additional, Vandenbroucke, M., additional, Virius, M., additional, Vlassov, N. V., additional, Windmolders, R., additional, Wiślicki, W., additional, Wollny, H., additional, Zaremba, K., additional, Zavertyaev, M., additional, Zemlyanichkina, E., additional, Ziembicki, M., additional, Zhuravlev, N., additional, and Zvyagin, A., additional

Published
2012
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2. Observation of aJPC=1−+Exotic Resonance in Diffractive Dissociation of190 GeV/cπ−intoπ−π−π+

Author

Alekseev, M. G., primary, Alexakhin, V. Yu., additional, Alexandrov, Yu., additional, Alexeev, G. D., additional, Amoroso, A., additional, Austregesilo, A., additional, Badełek, B., additional, Balestra, F., additional, Ball, J., additional, Barth, J., additional, Baum, G., additional, Bedfer, Y., additional, Bernhard, J., additional, Bertini, R., additional, Bettinelli, M., additional, Birsa, R., additional, Bisplinghoff, J., additional, Bordalo, P., additional, Bradamante, F., additional, Bravar, A., additional, Bressan, A., additional, Brona, G., additional, Burtin, E., additional, Bussa, M. P., additional, Chapiro, A., additional, Chiosso, M., additional, Chung, S. U., additional, Cicuttin, A., additional, Colantoni, M., additional, Crespo, M. L., additional, Dalla Torre, S., additional, Dafni, T., additional, Das, S., additional, Dasgupta, S. S., additional, Denisov, O. Yu., additional, Dhara, L., additional, Diaz, V., additional, Dinkelbach, A. M., additional, Donskov, S. V., additional, Doshita, N., additional, Duic, V., additional, Dünnweber, W., additional, Efremov, A., additional, El Alaoui, A., additional, Eversheim, P. D., additional, Eyrich, W., additional, Faessler, M., additional, Ferrero, A., additional, Finger, M., additional, Fischer, H., additional, Franco, C., additional, Friedrich, J. M., additional, Garfagnini, R., additional, Gautheron, F., additional, Gavrichtchouk, O. P., additional, Gazda, R., additional, Gerassimov, S., additional, Geyer, R., additional, Giorgi, M., additional, Gobbo, B., additional, Goertz, S., additional, Grabmüller, S., additional, Grajek, O. A., additional, Grasso, A., additional, Grube, B., additional, Gushterski, R., additional, Guskov, A., additional, Haas, F., additional, von Harrach, D., additional, Hasegawa, T., additional, Heckmann, J., additional, Heinsius, F. H., additional, Hermann, R., additional, Herrmann, F., additional, Heß, C., additional, Hinterberger, F., additional, Horikawa, N., additional, Höppner, Ch., additional, d’Hose, N., additional, Ilgner, C., additional, Ishimoto, S., additional, Ivanov, O., additional, Ivanshin, Yu., additional, Iwata, T., additional, Jahn, R., additional, Jasinski, P., additional, Jegou, G., additional, Joosten, R., additional, Kabuß, E., additional, Kang, D., additional, Ketzer, B., additional, Khaustov, G. V., additional, Khokhlov, Yu. A., additional, Kisselev, Yu., additional, Klein, F., additional, Klimaszewski, K., additional, Koblitz, S., additional, Koivuniemi, J. H., additional, Kolosov, V. N., additional, Komissarov, E. V., additional, Kondo, K., additional, Königsmann, K., additional, Konopka, R., additional, Konorov, I., additional, Konstantinov, V. F., additional, Korzenev, A., additional, Kotzinian, A. M., additional, Kouznetsov, O., additional, Kowalik, K., additional, Krämer, M., additional, Kral, A., additional, Kroumchtein, Z. V., additional, Kuhn, R., additional, Kunne, F., additional, Kurek, K., additional, Lauser, L., additional, Le Goff, J. M., additional, Lednev, A. A., additional, Lehmann, A., additional, Levorato, S., additional, Lichtenstadt, J., additional, Liska, T., additional, Maggiora, A., additional, Maggiora, M., additional, Magnon, A., additional, Mallot, G. K., additional, Mann, A., additional, Marchand, C., additional, Marroncle, J., additional, Martin, A., additional, Marzec, J., additional, Massmann, F., additional, Matsuda, T., additional, Maximov, A. N., additional, Meyer, W., additional, Michigami, T., additional, Mikhailov, Yu. V., additional, Moinester, M. A., additional, Mutter, A., additional, Nagaytsev, A., additional, Nagel, T., additional, Nassalski, J., additional, Negrini, T., additional, Nerling, F., additional, Neubert, S., additional, Neyret, D., additional, Nikolaenko, V. I., additional, Olshevsky, A. G., additional, Ostrick, M., additional, Padee, A., additional, Panknin, R., additional, Panzieri, D., additional, Parsamyan, B., additional, Paul, S., additional, Pawlukiewicz-Kaminska, B., additional, Perevalova, E., additional, Pesaro, G., additional, Peshekhonov, D. V., additional, Piragino, G., additional, Platchkov, S., additional, Pochodzalla, J., additional, Polak, J., additional, Polyakov, V. A., additional, Pontecorvo, G., additional, Pretz, J., additional, Quintans, C., additional, Rajotte, J.-F., additional, Ramos, S., additional, Rapatsky, V., additional, Reicherz, G., additional, Reggiani, D., additional, Richter, A., additional, Robinet, F., additional, Rocco, E., additional, Rondio, E., additional, Ryabchikov, D. I., additional, Samoylenko, V. D., additional, Sandacz, A., additional, Santos, H., additional, Sapozhnikov, M. G., additional, Sarkar, S., additional, Savin, I. A., additional, Sbrizzai, G., additional, Schiavon, P., additional, Schill, C., additional, Schlüter, T., additional, Schmitt, L., additional, Schopferer, S., additional, Schröder, W., additional, Shevchenko, O. Yu., additional, Siebert, H.-W., additional, Silva, L., additional, Sinha, L., additional, Sissakian, A. N., additional, Slunecka, M., additional, Smirnov, G. I., additional, Sosio, S., additional, Sozzi, F., additional, Srnka, A., additional, Stolarski, M., additional, Sulc, M., additional, Sulej, R., additional, Takekawa, S., additional, Tessaro, S., additional, Tessarotto, F., additional, Teufel, A., additional, Tkatchev, L. G., additional, Uhl, S., additional, Uman, I., additional, Venugopal, G., additional, Virius, M., additional, Vlassov, N. V., additional, Vossen, A., additional, Weitzel, Q., additional, Windmolders, R., additional, Wiślicki, W., additional, Wollny, H., additional, Zaremba, K., additional, Zavertyaev, M., additional, Zemlyanichkina, E., additional, Ziembicki, M., additional, Zhao, J., additional, Zhuravlev, N., additional, and Zvyagin, A., additional

Published
2010
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3. Observation of a New Narrow Axial-Vector Meson a1(1420).

Author

Adolph C, Akhunzyanov R, Alexeev MG, Alexeev GD, Amoroso A, Andrieux V, Anosov V, Austregesilo A, Azevedo C, Badełek B, Balestra F, Barth J, Beck R, Bedfer Y, Bernhard J, Bicker K, Bielert ER, Birsa R, Bisplinghoff J, Bodlak M, Boer M, Bordalo P, Bradamante F, Braun C, Bressan A, Büchele M, Burtin E, Chang WC, Chiosso M, Choi I, Chung SU, Cicuttin A, Crespo ML, Curiel Q, Dalla Torre S, Dasgupta SS, Dasgupta S, Denisov OY, Dhara L, Donskov SV, Doshita N, Dünnweber W, Duic V, Dziewiecki M, Efremov A, Eversheim PD, Eyrich W, Faessler M, Ferrero A, Finger M, Finger M, Fischer H, Franco C, du Fresne von Hohenesche N, Friedrich JM, Frolov V, Gautheron F, Gavrichtchouk OP, Gerassimov S, Gnesi I, Gorzellik M, Grabmüller S, Grasso A, Grosse-Perdekamp M, Grube B, Grussenmeyer T, Guskov A, Haas F, Hahne D, von Harrach D, Hashimoto R, Heinsius FH, Herrmann F, Hinterberger F, Horikawa N, d'Hose N, Hsieh CY, Huber S, Ishimoto S, Ivanov A, Ivanshin Y, Iwata T, Jahn R, Jary V, Jörg P, Joosten R, Kabuß E, Ketzer B, Khaustov GV, Khokhlov YA, Kisselev Y, Klein F, Klimaszewski K, Koivuniemi JH, Kolosov VN, Kondo K, Königsmann K, Konorov I, Konstantinov VF, Kotzinian AM, Kouznetsov O, Krämer M, Kremser P, Krinner F, Kroumchtein ZV, Kuchinski N, Kunne F, Kurek K, Kurjata RP, Lednev AA, Lehmann A, Levillain M, Levorato S, Lichtenstadt J, Maggiora A, Magnon A, Makins N, Makke N, Mallot GK, Marchand C, Martin A, Marzec J, Matousek J, Matsuda H, Matsuda T, Meshcheryakov G, Meyer W, Michigami T, Mikhailov YV, Miyachi Y, Nagaytsev A, Nagel T, Nerling F, Neyret D, Nikolaenko VI, Novy J, Nowak WD, Nunes AS, Olshevsky AG, Orlov I, Ostrick M, Panzieri D, Parsamyan B, Paul S, Peng JC, Pereira F, Pesek M, Peshekhonov DV, Platchkov S, Pochodzalla J, Polyakov VA, Pretz J, Quaresma M, Quintans C, Ramos S, Regali C, Reicherz G, Riedl C, Rocco E, Rossiyskaya NS, Ryabchikov DI, Rychter A, Samoylenko VD, Sandacz A, Santos C, Sarkar S, Savin IA, Sbrizzai G, Schiavon P, Schmeing S, Schmidt K, Schmieden H, Schönning K, Schopferer S, Schlüter T, Selyunin A, Shevchenko OY, Silva L, Sinha L, Sirtl S, Slunecka M, Sozzi F, Srnka A, Stolarski M, Sulc M, Suzuki H, Szabelski A, Szameitat T, Sznajder P, Takekawa S, Ter Wolbeek J, Tessaro S, Tessarotto F, Thibaud F, Tskhay V, Uhl S, Veloso J, Virius M, Wallner S, Weisrock T, Wilfert M, Zaremba K, Zavertyaev M, Zemlyanichkina E, Ziembicki M, and Zink A

Abstract

The COMPASS Collaboration at CERN has measured diffractive dissociation of 190  GeV/c pions into the π(-)π(-)π(+) final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins of 3π mass and four-momentum transfer using the isobar model and the so far largest PWA model consisting of 88 waves. A narrow peak is observed in the f0(980)π channel with spin, parity and C-parity quantum numbers J(PC)=1(++). We present a resonance-model study of a subset of the spin-density matrix selecting 3π states with J(PC)=2(++) and 4(++) decaying into ρ(770)π and with J(PC)=1(++) decaying into f0(980)π. We identify a new a1 meson with mass (1414(-13)(+15))  MeV/c2 and width (153(-23)(+8))  MeV/c2. Within the final states investigated in our analysis, we observe the new a1(1420) decaying only into f0(980)π, suggesting its exotic nature.

Published
2015
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4. Measurement of the charged-pion polarizability.

Author

Adolph C, Akhunzyanov R, Alexeev MG, Alexeev GD, Amoroso A, Andrieux V, Anosov V, Austregesilo A, Badełek B, Balestra F, Barth J, Baum G, Beck R, Bedfer Y, Berlin A, Bernhard J, Bicker K, Bieling J, Birsa R, Bisplinghoff J, Bodlak M, Boer M, Bordalo P, Bradamante F, Braun C, Bressan A, Büchele M, Burtin E, Capozza L, Chiosso M, Chung SU, Cicuttin A, Colantoni M, Crespo ML, Curiel Q, Dalla Torre S, Dasgupta SS, Dasgupta S, Denisov OY, Dinkelbach AM, Donskov SV, Doshita N, Duic V, Dünnweber W, Dziewiecki M, Efremov A, Elia C, Eversheim PD, Eyrich W, Faessler M, Ferrero A, Filin A, Finger M Jr, Finger M, Fischer H, Franco C, du Fresne von Hohenesche N, Friedrich JM, Frolov V, Gautheron F, Gavrichtchouk OP, Gerassimov S, Geyer R, Gnesi I, Gobbo B, Goertz S, Gorzellik M, Grabmüller S, Grasso A, Grube B, Grussenmeyer T, Guskov A, Guthörl T, Haas F, von Harrach D, Hahne D, Hashimoto R, Heinsius FH, Herrmann F, Hinterberger F, Höppner Ch, Horikawa N, d'Hose N, Huber S, Ishimoto S, Ivanov A, Ivanshin Y, Iwata T, Jahn R, Jary V, Jasinski P, Jörg P, Joosten R, Kabuss E, Ketzer B, Khaustov GV, Khokhlov YA, Kisselev Y, Klein F, Klimaszewski K, Koivuniemi JH, Kolosov VN, Kondo K, Königsmann K, Konorov I, Konstantinov VF, Kotzinian AM, Kouznetsov O, Krämer M, Kroumchtein ZV, Kuchinski N, Kuhn R, Kunne F, Kurek K, Kurjata RP, Lednev AA, Lehmann A, Levillain M, Levorato S, Lichtenstadt J, Maggiora A, Magnon A, Makke N, Mallot GK, Marchand C, Martin A, Marzec J, Matousek J, Matsuda H, Matsuda T, Meshcheryakov G, Meyer W, Michigami T, Mikhailov YV, Miyachi Y, Moinester MA, Nagaytsev A, Nagel T, Nerling F, Neubert S, Neyret D, Nikolaenko VI, Novy J, Nowak WD, Nunes AS, Olshevsky AG, Orlov I, Ostrick M, Panknin R, Panzieri D, Parsamyan B, Paul S, Peshekhonov D, Platchkov S, Pochodzalla J, Polyakov VA, Pretz J, Quaresma M, Quintans C, Ramos S, Regali C, Reicherz G, Rocco E, Rossiyskaya NS, Ryabchikov DI, Rychter A, Samoylenko VD, Sandacz A, Sarkar S, Savin IA, Sbrizzai G, Schiavon P, Schill C, Schlüter T, Schmidt K, Schmieden H, Schönning K, Schopferer S, Schott M, Shevchenko OY, Silva L, Sinha L, Sirtl S, Slunecka M, Sosio S, Sozzi F, Srnka A, Steiger L, Stolarski M, Sulc M, Sulej R, Suzuki H, Szabelski A, Szameitat T, Sznajder P, Takekawa S, ter Wolbeek J, Tessaro S, Tessarotto F, Thibaud F, Uhl S, Uman I, Virius M, Wang L, Weisrock T, Wilfert M, Windmolders R, Wollny H, Zaremba K, Zavertyaev M, Zemlyanichkina E, Ziembicki M, and Zink A

Abstract

The COMPASS collaboration at CERN has investigated pion Compton scattering, π(-)γ→π(-)γ, at center-of-mass energy below 3.5 pion masses. The process is embedded in the reaction π(-)Ni→π(-)γNi, which is initiated by 190 GeV pions impinging on a nickel target. The exchange of quasireal photons is selected by isolating the sharp Coulomb peak observed at smallest momentum transfers, Q(2)<0.0015  (GeV/c)(2). From a sample of 63,000 events, the pion electric polarizability is determined to be α(π)=(2.0±0.6(stat)±0.7(syst))×10(-4)  fm(3) under the assumption α(π)=-β(π), which relates the electric and magnetic dipole polarizabilities. It is the most precise measurement of this fundamental low-energy parameter of strong interaction that has been addressed since long by various methods with conflicting outcomes. While this result is in tension with previous dedicated measurements, it is found in agreement with the expectation from chiral perturbation theory. An additional measurement replacing pions by muons, for which the cross-section behavior is unambiguously known, was performed for an independent estimate of the systematic uncertainty.

Published
2015
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5. Observation of a J(PC)=1-+ exotic resonance in diffractive dissociation of 190   GeV/c π- into π- π- π+.

Author

Alekseev MG, Alexakhin VY, Alexandrov Y, Alexeev GD, Amoroso A, Austregesilo A, Badełek B, Balestra F, Ball J, Barth J, Baum G, Bedfer Y, Bernhard J, Bertini R, Bettinelli M, Birsa R, Bisplinghoff J, Bordalo P, Bradamante F, Bravar A, Bressan A, Brona G, Burtin E, Bussa MP, Chapiro A, Chiosso M, Chung SU, Cicuttin A, Colantoni M, Crespo ML, Dalla Torre S, Dafni T, Das S, Dasgupta SS, Denisov OY, Dhara L, Diaz V, Dinkelbach AM, Donskov SV, Doshita N, Duic V, Dünnweber W, Efremov A, El Alaoui A, Eversheim PD, Eyrich W, Faessler M, Ferrero A, Finger M, Finger M Jr, Fischer H, Franco C, Friedrich JM, Garfagnini R, Gautheron F, Gavrichtchouk OP, Gazda R, Gerassimov S, Geyer R, Giorgi M, Gobbo B, Goertz S, Grabmüller S, Grajek OA, Grasso A, Grube B, Gushterski R, Guskov A, Haas F, von Harrach D, Hasegawa T, Heckmann J, Heinsius FH, Hermann R, Herrmann F, Hess C, Hinterberger F, Horikawa N, Höppner Ch, d'Hose N, Ilgner C, Ishimoto S, Ivanov O, Ivanshin Y, Iwata T, Jahn R, Jasinski P, Jegou G, Joosten R, Kabuss E, Kang D, Ketzer B, Khaustov GV, Khokhlov YA, Kisselev Y, Klein F, Klimaszewski K, Koblitz S, Koivuniemi JH, Kolosov VN, Komissarov EV, Kondo K, Königsmann K, Konopka R, Konorov I, Konstantinov VF, Korzenev A, Kotzinian AM, Kouznetsov O, Kowalik K, Krämer M, Kral A, Kroumchtein ZV, Kuhn R, Kunne F, Kurek K, Lauser L, Le Goff JM, Lednev AA, Lehmann A, Levorato S, Lichtenstadt J, Liska T, Maggiora A, Maggiora M, Magnon A, Mallot GK, Mann A, Marchand C, Marroncle J, Martin A, Marzec J, Massmann F, Matsuda T, Maximov AN, Meyer W, Michigami T, Mikhailov YV, Moinester MA, Mutter A, Nagaytsev A, Nagel T, Nassalski J, Negrini T, Nerling F, Neubert S, Neyret D, Nikolaenko VI, Olshevsky AG, Ostrick M, Padee A, Panknin R, Panzieri D, Parsamyan B, Paul S, Pawlukiewicz-Kaminska B, Perevalova E, Pesaro G, Peshekhonov DV, Piragino G, Platchkov S, Pochodzalla J, Polak J, Polyakov VA, Pontecorvo G, Pretz J, Quintans C, Rajotte JF, Ramos S, Rapatsky V, Reicherz G, Reggiani D, Richter A, Robinet F, Rocco E, Rondio E, Ryabchikov DI, Samoylenko VD, Sandacz A, Santos H, Sapozhnikov MG, Sarkar S, Savin IA, Sbrizzai G, Schiavon P, Schill C, Schlüter T, Schmitt L, Schopferer S, Schröder W, Shevchenko OY, Siebert HW, Silva L, Sinha L, Sissakian AN, Slunecka M, Smirnov GI, Sosio S, Sozzi F, Srnka A, Stolarski M, Sulc M, Sulej R, Takekawa S, Tessaro S, Tessarotto F, Teufel A, Tkatchev LG, Uhl S, Uman I, Venugopal G, Virius M, Vlassov NV, Vossen A, Weitzel Q, Windmolders R, Wiślicki W, Wollny H, Zaremba K, Zavertyaev M, Zemlyanichkina E, Ziembicki M, Zhao J, Zhuravlev N, and Zvyagin A

Abstract

The COMPASS experiment at the CERN SPS has studied the diffractive dissociation of negative pions into the π- π- π+ final state using a 190  GeV/c pion beam hitting a lead target. A partial wave analysis has been performed on a sample of 420,000 events taken at values of the squared 4-momentum transfer t' between 0.1 and 1  GeV2/c2. The well-known resonances a1(1260), a2(1320), and π2(1670) are clearly observed. In addition, the data show a significant natural-parity exchange production of a resonance with spin-exotic quantum numbers J(PC)=1-+ at 1.66  GeV/c2 decaying to ρπ. The resonant nature of this wave is evident from the mass-dependent phase differences to the J(PC)=2-+ and 1++ waves. From a mass-dependent fit a resonance mass of (1660±10(-64)(+0))  MeV/c2 and a width of (269±21(-64)(+42))  MeV/c2 are deduced, with an intensity of (1.7±0.2)% of the total intensity.

Published
2010
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