Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/100/16147
Title: Exclusive measurement of the eta -> pi(+) pi(-) gamma decay
Authors: ADLARSON, P
ADOLPH, C
AUGUSTYNIAK, W
BARDAN, W
BASHKANOV, M
BEDNARSKI, T
BERGMANN, FS
BERLOWSKI, M
BHATT, H
BRINKMANN, KT
BUSCHER, M
CALEN, H
CLEMENT, H
CODERRE, D
CZERWINSKI, E
DOROSHKEVICH, E
ENGELS, R
ERVEN, W
EYRICH, W
FEDORETS, P
FOHL, K
FRANSSON, K
GOLDENBAUM, F
GOSLAWSKI, P
GRIGORYEV, K
GULLSTROM, CO
HANHART, C
HEIJKENSKJOLD, L
HEIMLICH, J
HEJNY, V
HINTERBERGER, F
HODANA, M
HOISTAD, B
JACEWICZ, M
JANY, A
JANY, BR
JARCZYK, L
JOHANSSON, T
KAMYS, B
KEMMERLING, G
KHAKIMOVA, O
KHOUKAZ, A
KISTRYN, S
KLAJA, J
KLEINES, H
KLOS, B
KREN, F
KRZEMIEN, W
KULESSA, P
KUPSC, A
LALWANI, K
LEUPOLD, S
LORENTZ, B
MAGIERA, A
MAIER, R
MARIANSKI, B
MARCINIEWSKI, P
MEISSNER, UG
MIKIRTYCHIANTS, M
MORSCH, HP
MOSKAL, P
NANDI, BK
NIEDZWIECKI, S
OHM, H
PASSFELD, A
PAULY, C
DEL RIO, EP
PETRI, T
PETUKHOV, Y
PISKUNOV, N
PLUCINSKI, P
PODKOPAL, P
POVTOREYKO, A
PRASUHN, D
PRICKING, A
PYSZ, K
PYSZNIAK, A
RAUSMANN, T
REDMER, CF
RITMAN, J
ROY, A
RUDY, Z
SAWANT, S
SCHADMAND, S
SCHMIDT, A
SEFZICK, T
SERDYUK, V
SHAH, N
SIEMASZKO, M
SIUDAK, R
SKORODKO, T
SKURZOK, M
SMYRSKI, J
SOPOV, V
STASSEN, R
STEPANIAK, J
STERZENBACH, G
STOCKHORST, H
STOLLENWERK, F
STROHER, H
SZCZUREK, A
TASCHNER, A
TERSCHLUSEN, C
TOLBA, T
TRZCINSKI, A
VARMA, R
VLASOV, P
WAGNER, GJ
WEGLORZ, W
WINNEMOLLER, A
WIRZBA, A
WOLKE, M
WRONSKA, A
WUSTNER, P
WURM, P
YUAN, X
YUREV, L
ZABIEROWSKI, J
ZHENG, C
ZIELINSKI, MJ
ZIPPER, W
ZLOMANCZUK, J
ZUPRANSKI, P
Keywords: Eta Meson
Box Anomaly
Exclusive Measurement
Issue Date: 2012
Publisher: ELSEVIER SCIENCE BV
Citation: PHYSICS LETTERS B, 707(2)243-249
Abstract: An exclusive measurement of the decay eta -> pi(+) pi(-) gamma has been performed at the WASA facility at COSY. The eta mesons were produced in the fusion reaction pd -> He-3 X at a proton beam momentum of 1.7 GeV/c. Efficiency corrected differential distributions have been extracted based on 13 960 +/- 140 events after background subtraction. The measured pion angular distribution is consistent with a relative p-wave of the two-pion system, whereas the measured photon energy spectrum was found at variance with the simplest gauge invariant matrix element of eta -> pi(+) pi(-) gamma. A parameterization of the data can be achieved by the additional inclusion of the empirical pion vector form factor multiplied by a first-order polynomial in the squared invariant mass of the pi(+) pi(-) system. (C) 2011 Elsevier B.V All rights reserved.
URI: http://dx.doi.org/10.1016/j.physletb.2011.12.027
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