Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction

Airapetian, A.; Акопов, Н.; Akopov, Z.; Amarian, M.; Ammosov, V. V.; Andrus, A.; Aschenauer, E. C.; Augustyniak, W.; Avakian, R.; Avetissian, A.; Avetissian, E.; Bailey, P.; Balin, D. V.; Baturin, V.; Beckmann, M.; Belostotski, S.; Bernreuther, S.; Bianchi, N.; Blok, H. P.; Böttcher, H.; Borissov, A.; Borysenko, A.; Bouwhuis, M.; Brack, J.; Brüll, A.; Bryzgalov, V.; Capitani, G. P.; Chen, T.; Chen, X.; Chiang, H. C.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P.; Deconinck, W.; Лео, Р. Де; Nardo, L. De; Sanctis, E. De; Devitsin, E.; Nezza, P. Di; Düren, M.; Ehrenfried, M.; Elalaoui-Moulay, A.; Elbakian, G.; Ellinghaus, F.; Elschenbroich, U.; Ely, James H.; Fabbri, R.; Fantoni, A.; Fechtchenko, A.; Felawka, L.; Fox, B. D.; Frullani, S.; Gapienko, G.; Гапиенко, В. А.; Garibaldi, F.; Garrow, K.; Garutti, E.; Gaskell, D.; Gavrilov, G.; Gharibyan, V.; Graw, G.; Grebeniouk, O.; Greeniaus, L.G.; Gregor, I. M.; Hafidi, K.; Hartig, M.; Hasch, D.; Heesbeen, D.; Henoch, M.; Hertenberger, R.; Hesselink, W.H.A.; Hillenbrand, A.; Hoek, M.; Holler, Y.; Hommez, B.; Iarygin, G.; Ivanilov, A.; Izotov, A.; Jackson, H. E.; Jgoun, A.; Kaiser, R.; Kinney, E.; Kisselev, A.; Kopytin, M.; Коротков, В. А.; Kozlov, V.; Krauß, Bernhard; Krivokhijine, V. G.; Lagamba, L.; Lapikás, L.; Laziev, A.; Lenisa, P.; Liebing, P.; Linden-Levy, L. A.; Lipka, K.; Lorenzon, W.; Lü, H. J.; Lu, J.; Lü, Shaozhe; Lu, X. R.; Ma, Bo-Qiang; Maiheu, B.; Makins, N.; Mao, Y.; Mariański, B.; Marukyan, H.; Masoli, F.; Mexner, V.; Meyners, N.; Mikloukho, O.; Miller, C. A.; Miyachi, Y.; Muccifora, V.; Нагайцев, А.; Nappi, E.; Naryshkin, Y.; Nass, A.; Negodaev, M.; Nowak, W.-D.; Oganessyan, K.; Ohsuga, H.; Pickert, N.; Potashov, S.; Potterveld, D. H.; Raithel, Martin; Reggiani, D.; Reimer, P. E.; Reischl, A.; Reolon, A. R.; Riedl, C.; Rith, Klaus; Rosner, G.; Rostomyan, A.; Rubáček, L.; Rubin, J.; Ryckbosch, D.; Salomatin, Y.; Sanjiev, I.; Savin, I.; Schäfer, Andreas; Schill, C.; Schnell, G.; Schüler, K. P.; Seele, J.; Seidl, R.; Seitz, B.; Shanidze, R.; Shearer, C.; Shibata, T. A.; Shutov, V.; Simani, M. C.; Sinram, K.; Stancari, M.; Statera, M.; Steffens, E.; Steijger, J. J. M.; Stenzel, H.; Stewart, J.; Stinzing, F.; Stößlein, U.; Tait, P.; Tanaka, Hiroki; Taroian, S.; Tchuiko, B.; Terkulov, A.; Tkabladze, A.; Trzciński, A.; Tytgat, M.; Vandenbroucke, A.; Nat, P. van der; Steenhoven, G. van der; Vetterli, M. C.; Vikhrov, V.; Vincter, M. G.; Vogel, Christian; Vogt, Meike; Volmer, J.; Weiskopf, C.; Wendland, J.; Wilbert, Jürgen; Smit, G. Ybeles; Ye, Y.; Ye, Z.; Yen, S.; Yu, W.; Zihlmann, B.; Zohrabian, H.; Żuprański, P.

doi:10.1016/j.physletb.2004.01.079

Cited by 237 publications

(60 citation statements)

References 29 publications

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“…The mass of the resonance was measured to be (1540 ± 10) MeV/c 2 , in remarkable agreement with the theoretical prediction for the Θ + state made in the framework of the chiral soliton model by Diakonov, Petrov, and Polyakov [4]. Various experiments, using incident beams of real and quasi-real photons, kaons, and neutrons, claimed to confirm the initial reports of Θ + decaying to nK + and pK 0 S [5,6,7,8,9,10,11,12,13]. Another manifestly exotic state, a doubly negative baryon decaying to Ξ − π − [14], and its neutral partner decaying to Ξ − π + , were reported by the NA49 Collaboration in √ s = 17.2 GeV pp collisions at the CERN SPS [15].…”

supporting

confidence: 83%

Search for exoticS=−2baryons inpp¯collisions ats=
Abulencia¹,
Adelman²,
Affolder³
et al. 2007
Phys. Rev. D
9
0
3
0
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supporting

confidence: 83%

Search for exoticS=−2baryons inpp¯collisions ats=
Abulencia¹,
Adelman²,
Affolder³
et al. 2007
Phys. Rev. D
9
0
3
0
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“…The recent discovery of this truly exotic baryon [2,3,4,5,6,7,8] has triggered an intensive investigation aimed at a determination of its basic properties. Currently, available data do not allow for the determination of either its spin or its parity.…”

mentioning

confidence: 99%

Spin observables and the determination of the parity ofΘ+in photoproduction reaction

Nakayama

Love

2004

Phys. Rev. C

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Spin observables in the photoproduction of the Θ + are explored for the purpose of determining the parity of the Θ + . Based on reflection symmetry in the scattering plane, we show that certain spin observables in the photoproduction of the Θ + can be related directly to its parity. We also show that measurements of both the target nucleon asymmetry and the Θ + polarization may be useful in determining the parity of Θ + in a model-independent way. Furthermore, we show that no combination of spin observables involving only the polarization of the photon and/or nucleon in the initial state can determine the parity of Θ + unambiguously.

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“…The HERMES Collaboration searched for the Θ + in quasi-real photo-production off a deuterium target in 2004 [12] using the decay channel Θ + → pK 0 S → pπ + π − . A narrow structure was observed at 1528 MeV with a significance of 3.7 σ.…”

Section: Introductionmentioning

confidence: 99%

Θ⁺Search at HERMES with Deuterium and Hydrogen Targets

Wang¹,

Schnell²

2016

Proceedings of the 10th International Workshop on the Physics of Excited Nucleons (NSTAR2015)

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The previous search at HERMES for narrow baryon states excited in quasi-real photoproduction, decaying through the channel Θ + → pK 0 S → pπ + π − , has been extended. Improved decay-particle reconstruction, more advanced particle identification, and increased event samples are employed. The structure that was observed earlier at an invariant mass of 1528 MeV shifts to 1522 MeV in the new analysis of data with a deuterium target, with a drop of statistical significance to about 2σ. The number of events above background is 68 +98 −31 (stat) ± 13(sys). No such structure is observed in the hydrogen data set.

show abstract

Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction

Cited by 237 publications

References 29 publications

Search for exoticS=−2baryons inpp¯collisions ats=
Abulencia¹,
Adelman²,
Affolder³
et al. 2007
Phys. Rev. D
9
0
3
0
View full text Add to dashboard Cite

Search for exoticS=−2baryons inpp¯collisions ats=
Abulencia¹,
Adelman²,
Affolder³
et al. 2007
Phys. Rev. D
9
0
3
0
View full text Add to dashboard Cite

Spin observables and the determination of the parity ofΘ+in photoproduction reaction

Θ⁺Search at HERMES with Deuterium and Hydrogen Targets

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Evidence for a narrow |S|=1 baryon state at a mass of 1528 MeV in quasi-real photoproduction

Cited by 237 publications

References 29 publications

Search for exoticS=−2baryons inpp¯collisions ats=Abulencia1, Adelman2, Affolder3 et al. 2007Phys. Rev. D9030View full textAdd to dashboardCite

Search for exoticS=−2baryons inpp¯collisions ats=Abulencia1, Adelman2, Affolder3 et al. 2007Phys. Rev. D9030View full textAdd to dashboardCite

Spin observables and the determination of the parity ofΘ+in photoproduction reaction

Θ+Search at HERMES with Deuterium and Hydrogen Targets

Contact Info

Product

Resources

About

Search for exoticS=−2baryons inpp¯collisions ats=
Abulencia¹,
Adelman²,
Affolder³
et al. 2007
Phys. Rev. D
9
0
3
0
View full text Add to dashboard Cite

Search for exoticS=−2baryons inpp¯collisions ats=
Abulencia¹,
Adelman²,
Affolder³
et al. 2007
Phys. Rev. D
9
0
3
0
View full text Add to dashboard Cite

Θ⁺Search at HERMES with Deuterium and Hydrogen Targets