Experimental study of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>P</mml:mi><mml:mn>11</mml:mn></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mn>1440</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>D</mml:mi><mml:mn>13</mml:mn></mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mn>1520</mml:mn><mml:mo>)</mml:mo></mml:mrow></mml:mrow></mml:math>resonances from the CLAS data on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>e</mml:mi><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>′</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:msup><mml:mi>p</mml:mi><mml:mo>′</mml:mo></mml:msup></mml:mrow></mml:math>
V. MokeevSkobeltsyn Nuclear Physics Institute and Physics Department at Moscow State University, 119899 Moscow, RussiaV. D. BurkertThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAL. ElouadrhiriThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAG. FedotovSkobeltsyn Nuclear Physics Institute and Physics Department at Moscow State University, 119899 Moscow, RussiaE. GolovatchSkobeltsyn Nuclear Physics Institute and Physics Department at Moscow State University, 119899 Moscow, RussiaR. W. GotheUniversity of South Carolina, Columbia, South Carolina 29208, USAБ. С. ИшхановSkobeltsyn Nuclear Physics Institute and Physics Department at Moscow State University, 119899 Moscow, RussiaE. L. IsupovSkobeltsyn Nuclear Physics Institute and Physics Department at Moscow State University, 119899 Moscow, RussiaK. P. AdhikariOld Dominion University, Norfolk, Virginia 23529, USAM. AghasyanINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyM. AnghinolfiINFN, Sezione di Genova, 16146 Genova, ItalyH. AvakianThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAH. BaghdasaryanUniversity of Virginia, Charlottesville, Virginia 22901, USAJ. BallCEA, Centre de Saclay, Irfu/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, FranceN. A. BaltzellArgonne National Laboratory, Argonne, Illinois 60439, USAM. BattaglieriINFN, Sezione di Genova, 16146 Genova, ItalyV. BatourineThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAI. BedlinskiyInstitute of Theoretical and Experimental Physics, Moscow 117259, RussiaA. S. BiselliFairfield University, Fairfield, Connecticut 06824, USAC. BookwalterFlorida State University, Tallahassee, Florida 32306, USAS. BoiarinovInstitute of Theoretical and Experimental Physics, Moscow 117259, RussiaW. J. BriscoeThe George Washington University, Washington, DC 20052, USAW. K. BrooksThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAD. S. CarmanThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAA. CelentanoINFN, Sezione di Genova, 16146 Genova, ItalyG. CharlesCEA, Centre de Saclay, Irfu/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, FranceP. L. ColeIdaho State University, Pocatello, Idaho 83209, USAM. ContalbrigoINFN, Sezione di Ferrara, 44100 Ferrara, ItalyV. CredéFlorida State University, Tallahassee, Florida 32306, USAA. D’AngeloINFN, Sezione di Roma Tor Vergata, 00133 Rome, ItalyA. V. DanielOhio University, Athens, Ohio 45701, USAN. DashyanYerevan Physics Institute, 375036 Yerevan, ArmeniaR. De VitaINFN, Sezione di Genova, 16146 Genova, ItalyE. De SanctisINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyA. DeurThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAC. DjalaliUniversity of South Carolina, Columbia, South Carolina 29208, USAD. DoughtyChristopher Newport University, Newport News, Virginia 23606, USAR. DupréArgonne National Laboratory, Argonne, Illinois 60439, USAA. El AlaouiArgonne National Laboratory, Argonne, Illinois 60439, USAP. EugenioFlorida State University, Tallahassee, Florida 32306, USAS. FeganUniversity of Glasgow, Glasgow G12 8QQ, United KingdomA. FradiInstitut de Physique Nucléaire ORSAY, Orsay, FranceK. L. GiovanettiJames Madison University, Harrisonburg, Virginia 22807, USAF. X. GirodThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAW. GohnUniversity of Connecticut, Storrs, Connecticut 06269, USAL. GrahamUniversity of South Carolina, Columbia, South Carolina 29208, USAK. A. GriffioenCollege of William and Mary, Williamsburg, Virginia 23187-8795, USAB. GueganInstitut de Physique Nucléaire ORSAY, Orsay, FranceM. GuidalInstitut de Physique Nucléaire ORSAY, Orsay, FranceL. GuoFlorida International University, Miami, Florida 33199, USAK. HafidiArgonne National Laboratory, Argonne, Illinois 60439, USAH. HakobyanUniversidad Técnica Federico Santa María, Casilla 110-V Valparaíso, ChileC. HanrettyUniversity of Virginia, Charlottesville, Virginia 22901, USAK. HicksOhio University, Athens, Ohio 45701, USAD. HoCarnegie Mellon University, Pittsburgh, Pennsylvania 15213, USAM. HoltropUniversity of New Hampshire, Durham, New Hampshire 03824-3568, USAY. IlievaThe George Washington University, Washington, DC 20052, USAD. G. IrelandUniversity of Glasgow, Glasgow G12 8QQ, United KingdomH. S. JoInstitut de Physique Nucléaire ORSAY, Orsay, FranceK. JooUniversity of Connecticut, Storrs, Connecticut 06269, USAD. KellerUniversity of Virginia, Charlottesville, Virginia 22901, USAM. KhandakerNorfolk State University, Norfolk, Virginia 23504, USAP. KhetarpalFlorida International University, Miami, Florida 33199, USAA. KimKyungpook National University, Daegu 702-701, Republic of KoreaW. KimKyungpook National University, Daegu 702-701, Republic of KoreaA. KleinOld Dominion University, Norfolk, Virginia 23529, USAFrank KleinCatholic University of America, Washington, DC 20064, USAS. KoiralaOld Dominion University, Norfolk, Virginia 23529, USAA. KubarovskyRensselaer Polytechnic Institute, Troy, New York 12180-3590, USAV. KubarovskyThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAS. KuleshovInstitute of Theoretical and Experimental Physics, Moscow 117259, RussiaN. D. KvaltineUniversity of Virginia, Charlottesville, Virginia 22901, USAK. LivingstonOld Dominion University, Norfolk, Virginia 23529, USAH. Y. LuCatholic University of America, Washington, DC 20064, USAI. J. D. MacGregorUniversity of Glasgow, Glasgow G12 8QQ, United KingdomY. MaoUniversity of South Carolina, Columbia, South Carolina 29208, USAN. MarkovUniversity of Connecticut, Storrs, Connecticut 06269, USAD. MartinezIdaho State University, Pocatello, Idaho 83209, USAM. MayerOld Dominion University, Norfolk, Virginia 23529, USAB. McKinnonUniversity of Glasgow, Glasgow G12 8QQ, United KingdomC. A. MeyerCarnegie Mellon University, Pittsburgh, Pennsylvania 15213, USAT. MineevaUniversity of Connecticut, Storrs, Connecticut 06269, USAM. MirazitaINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyH. MoutardeCEA, Centre de Saclay, Irfu/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, FranceE. MunévarThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAP. Nadel-TurońskiThomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USAC. S. NepaliOld Dominion University, Norfolk, Virginia 23529, USAA. I. OstrovidovFlorida State University, Tallahassee, Florida 32306, USAL. L. PappalardoINFN, Sezione di Ferrara, 44100 Ferrara, ItalyR. ParemuzyanYerevan Physics Institute, 375036 Yerevan, ArmeniaK. ParkKyungpook National University, Daegu 702-701, Republic of KoreaS. ParkFlorida State University, Tallahassee, Florida 32306, USAE. PasyukArizona State University, Tempe, Arizona 85287-1504, USAS. Anefalos PereiraINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyS. PisanoINFN, Laboratori Nazionali di Frascati, 00044 Frascati, ItalyO. PogorelkoInstitute of Theoretical and Experimental Physics, Moscow 117259, RussiaS. PozdniakovInstitute of Theoretical and Experimental Physics, Moscow 117259, RussiaJ. W. PriceCalifornia State University, Dominguez Hills, Carson, California 90747, USAS. ProcureurCEA, Centre de Saclay, Irfu/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, FranceD. ProtopopescuUniversity of Glasgow, Glasgow G12 8QQ, United Kingdom
2012lv
ABI
Аннотация
The transition helicity amplitudes from the proton ground state to the ${P}_{11}(1440)$ and ${D}_{13}(1520)$ excited states (${\ensuremath{\gamma}}_{v}p{N}^{*}$ electrocouplings) were determined from the analysis of nine independent one-fold differential ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}p$ electroproduction cross sections off a proton target, taken with CLAS at photon virtualities of $0.25<{Q}^{2}<0.60$ GeV${}^{2}$. The phenomenological reaction model was employed for separation of the resonant and nonresonant contributions to the final state. The ${P}_{11}(1440)$ and ${D}_{13}(1520)$ electrocouplings were obtained from the resonant amplitudes parametrized within the framework of a unitarized Breit-Wigner ansatz. They are consistent with results obtained in the previous CLAS analyses of the ${\ensuremath{\pi}}^{+}n$ and ${\ensuremath{\pi}}^{0}p$ channels. The successful description of a large body of data in dominant meson-electroproduction channels off protons with the same ${\ensuremath{\gamma}}_{v}p{N}^{*}$ electrocouplings offers clear evidence for the reliable extraction of these fundamental quantities from meson-electroproduction data. This analysis also led to the determination of the long-awaited hadronic branching ratios for the ${D}_{13}(1520)$ decay into $\ensuremath{\Delta}\ensuremath{\pi}$ (24$%$--32$%$) and $N\ensuremath{\rho}$ (8$%$--17$%$).
Перевод пока недоступен
Идентификаторы
Цитирования и источники
Цитирований: 2Использованных источников: 0