Publisher’s Note:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>η</mml:mi></mml:math>Photoproduction on the Proton for Photon Energies from 0.75 to 1.95 GeV [Phys. Rev. Lett.<b>89</b>, 222002 (2002)]

Dugger, M.; Ritchie, B. G.; Ball, J.; Pasyuk, E.; Adams, G. S.; Anciant, E.; Anghinolfi, M.; Asavapibhop, B.; Audit, G.; Auger, T.; Avakian, H.; Bagdasaryan, H.; Barrow, S.; Battaglieri, M.; Beard, K.; Bektasoglu, M.; Bellis, M.; Berman, B. L.; Bianchi, N.; Biselli, A.; Boiarinov, S.; Bouchigny, S.; Bradford, R.; Branford, D.; Briscoe, W. J.; Brooks, W. K.; Burkert, Volker; Calarco, J. R.; Capitani, G. P.; Carman, D. S.; Carnahan, B.; Cetina, C.; Clark, R. K.; Cole, P. L.; Coleman, Alan; Connelly, J.; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Cummings, J.; DeSanctis, E.; DeVita, R.; Degtyarenko, P. V.; Denizli, H.; Dennis, L.; Dharmawardane, K. V.; Dhuga, K. S.; Djalali, C.; Dodge, G. E.; Doughty, D.; Dragovitsch, P.; Dytman, S. A.; Eckhause, M.; Egiyan, H.; Egiyan, K. S.; Elouadrhiri, L.; Farhi, L.; Fatemi, R.; Feldman, G. J.; Feuerbach, R. J.; Ficenec, J.; Forest, T. A.; Фролов, В.; Funsten, H. O.; Gaff, S. J.; Gai, M.; Gavalian, G.; Gilad, S.; Gilfoyle, G. P.; Giovanetti, K. L.; Girard, Pascal; Gordon, C. I O; Griffioen, K. A.; Guidal, M.; Guillo, M.; Guo, L.; Gyurjyan, V.; Hadjidakis, C.; Hancock, D.; Hardie, J.; Heddle, D.; Heimberg, P.; Hersman, F. W.; Hicks, K.; Hicks, R. S.; Holtrop, M.; Hyde-Wright, C. E.; Ito, M.; Jenkins, D.; Joo, K. S.; Kelley, J. H.; Kellie, J. D.; Khandaker, M.; Kim, W.; Klein, A.; Klein, F. J.; Klusman, M.; Kossov, M.; Koubarovski, V.; Kramer, L. H.; Kuang, Y. P.; Kuhn, S. E.; Kühn, J.; Lachniet, J.; Laget, J. M.; Lawrence, D.; Li, Ji; Livingston, K.; Longhi, A.; Lucas, M.; Lukashin, K.; Major, W.; Manak, J. J.; Marchand, Claude; McAleer, S.; McCarthy, J.; McNabb, J. W. C.; Mecking, B. A.; Mehrabyan, S.; Mestayer, M. D.; Meyer, Chris; Mikhailov, K.; Minehart, R.; Mirazita, M.; Miskimen, R.; Morand, L.; Morrow, S. A.; Mozer, M. U.; Muccifora, V.; Mueller, J.M.; Murphy, L. Y.; Mutchler, G. S.; Napolitano, J.; Nasseripour, R.; Nelson, S.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B. B.; Niyazov, R. A.; Nozar, M.; O’Brien, J. T.; O’Rielly, G. V.; Opper, A. K.; Park, K.; Peterson, G. A.; Philips, S. A.; Pivnyuk, N.; Počanić, D.; Pogorelko, D.; Polli, E.; Pozdniakov, S.; Preedom, B. M.; Price, J. W.; Prok, Y.; Protopopescu, D.; Qin, L. M.; Raue, B. A.; Riccardi, G.; Ricco, G.; Ripani, M.; Ronchetti, F.; Rossi, P.; Rowntree, D.; Rubin, P. D.; Sabatié, F.; Sabourov, K.; Salgado, C.; Santoro, J. P.; Sanzone-Arenhovel, M.; Sapunenko, V.; Schumacher, R. A.; Serov, V. S.; Shafi, A.; Sharabian, Y. G.; Shaw, J.; Skabelin, A. V.; Smith, E.; Smith, T. B.; Smith, L. C.; Sober, D. I.; Spraker, M.; Stavinsky, A.; Stepanyan, S.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Taylor, S.; Tedeschi, D. J.; Thoma, U.; Thompson, R. J.; Todor, L.; Ungaro, M.; Vineyard, M. F.; Vlassov, Alexander V.; Wang, K.; Weinstein, Larry; Weller, H.R.; Weygand, D. P.; Whisnant, C. S.; Witkowski, M.; Wolin, E.; Wood, M. H.; Yegneswaran, A.; Yun, J.; Zhang, B.; Zhao, J.; Zhou, Zhengxin

doi:10.1103/physrevlett.89.249904

Cited by 39 publications

(58 citation statements)

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“…Other resonances (N (1520)3/2 − ) contribute at threshold only via interference terms with the leading E 0+ multipole [9] or at higher excitation energies [6]. Precise measurements of differential cross sections have been reported from CLAS [10,11], ELSA [12][13][14], GRAAL [15], and MAMI [7,16]. The beam asymmetry Σ has been measured at GRAAL and at ELSA [17][18][19], results for the target asymmetry T and the double-polarization observable F have been published from the Crystal Ball/TAPS experiment at MAMI [20], results for the double-polarization observable E have been reported from the CLAS experiment [21], and new results for the polarization observables T , E, P , H, and G from ELSA have been submitted for publication [22].…”

Section: Introductionmentioning

confidence: 99%

Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons

Witthauer¹,

Dieterle²,

Abt³

et al. 2017

Phys. Rev. C

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Precise helicity-dependent cross sections and the double-polarization observable E were measured for η photoproduction from quasifree protons and neutrons bound in the deuteron. The η → 2γ and η → 3π 0 → 6γ decay modes were used to optimize the statistical quality of the data and to estimate systematic uncertainties. The measurement used the A2 detector setup at the tagged photon beam of the electron accelerator MAMI in Mainz. A longitudinally polarized deuterated butanol target was used in combination with a circularly polarized photon beam from bremsstrahlung of a longitudinally polarized electron beam. The reaction products were detected with the electromagnetic calorimeters Crystal Ball and TAPS, which covered 98% of the full solid angle. The results show that the narrow structure observed earlier in the unpolarized excitation function of η photoproduction off the neutron appears only in reactions with antiparallel photon and nucleon spin (σ 1/2 ). It is absent for reactions with parallel spin orientation (σ 3/2 ) and thus very probably related to partial waves with total spin 1/2. The behavior of the angular distributions of the helicity-dependent cross sections was analyzed by fitting them with * Also at Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy. Legendre polynomials. The results are in good agreement with a model from the Bonn-Gatchina group, which uses an interference of P 11 and S 11 partial waves to explain the narrow structure.

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Section: Introductionmentioning

confidence: 99%

Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons

Witthauer¹,

Dieterle²,

Abt³

et al. 2017

Phys. Rev. C

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“…This reaction is dominated by the excitation of the N (1535)1/2 − and N (1650)1/2 − states [10,11] and a very small contribution from the N (1520)3/2 − state has been identified mainly from the S 11 − D 13 interference term in the photon beam asymmetry [12,13,14]. Angular distributions for γp → pη from threshold up to photon energies of 2.5 GeV were measured by several experiments, in particular at CLAS [15,16], ELSA [17,18,19], GRAAL [20], LNS [21], and at MAMI [10,22]. Recently, also results for the transverse target asymmetry T and the beam-target asymmetry F were published from a MAMI experiment [23] and results for the double polarization observable E became available from CLAS [24].…”

Section: Introductionmentioning

confidence: 99%

Photoproduction of $\eta$ η mesons from the neutron: Cross sections and double polarization observable E

Witthauer¹,

Dieterle²,

Afzal³

et al. 2017

Eur. Phys. J. A

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Abstract. Results from measurements of the photoproduction of η mesons from quasifree protons and neutrons are summarized. The experiments were performed with the CBELSA/TAPS detector at the electron accelerator ELSA in Bonn using the η → 3π 0 → 6γ decay. A liquid deuterium target was used for the measurement of total cross sections and angular distributions. The results confirm earlier measurements from Bonn and the MAMI facility in Mainz about the existence of a narrow structure in the excitation function of γn → nη. The current angular distributions show a forward-backward asymmetry, which was previously not seen, but was predicted by model calculations including an additional narrow P11 state. Furthermore, data obtained with a longitudinally polarized, deuterated butanol target and a circularly polarized photon beam were analyzed to determine the double polarization observable E. Both data sets together were also used to extract the helicity dependent cross sections σ 1/2 and σ 3/2 . The narrow structure in the excitation function of γn → nη appears associated with the helicity-1/2 component of the reaction.

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“…2.1 has been used to study γp → ηp [22,23,24,25,26] and γp → K + Λ [32] processes. The mixing angles, left as adjustable parameters, have been extracted [22,24] by fitting γp → ηp data [41,63], including polarization asymmetries. Those models embody all nucleon resonances given in Table 1.…”

Section: Calculation Of the R Constantmentioning

confidence: 99%

Configuration Mixing of Quark States in Baryons

Saghai

2009

Few-Body Syst

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Mixing angles are used to describe the $SU(6)\otimes O(3)$ symmetry breaking in $\left[70,~1^-\right]$ multiplet in the sector of the lowest mass nucleon resonances, which are investigated extensively in constituent quark models for baryon spectroscopy. The transition amplitudes for the meson photoproduction off nucleon can also be expressed in terms of the mixing angles to take into account the configuration mixing. Those amplitudes are derived as a function of the mixing angles between $|N^2P_M{J}^-\rangle$ and $|N^4P_M{J}^-\rangle$ states, with $J$=1/2 and 3/2, for the processes $\gamma p \to \eta p,~K^+ \Lambda,~K^+ \Sigma^\circ,~K^\circ \Sigma^+$. The present status of our knowledge on the mixing angles between $S_{11}(1535)$ and $S_{11}(1650)$ ($\theta _{S}$), as well as between $D_{13}(1520)$ and $D_{13} (1700)$ ($\theta _{D}$) is reported. Since these resonances play very important role in the threshold region for both $\eta$ and kaon production mechanisms, they are expected to provide crucial tests of different quark models for the baryon spectroscopy

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Publisher’s Note:ηPhotoproduction on the Proton for Photon Energies from 0.75 to 1.95 GeV [Phys. Rev. Lett.89, 222002 (2002)]

Cited by 39 publications

References 0 publications

Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons

Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons

Photoproduction of $\eta$ η mesons from the neutron: Cross sections and double polarization observable E

Configuration Mixing of Quark States in Baryons

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