Measurement of the Σπ photoproduction line shapes near the Λ(1405)

K. Moriya, R. A. Schumacher, K. P. Adhikari, D. Adikaram, M. Aghasyan, M. D. Anderson, S. Anefalos Pereira, J. Ball, N. A. Baltzell, M. Battaglieri, V. Batourine, I. Bedlinskiy, M. Bellis, A. S. Biselli, J. Bono, S. Boiarinov, W. J. Briscoe, V. D. Burkert, D. S. Carman, A. Celentano & 135 others S. Chandavar, G. Charles, P. L. Cole, P. Collins, V. Crede, A. D'Angelo, N. Dashyan, E. De Sanctis, R. De Vita, A. Deur, B. Dey, C. Djalali, D. Doughty, R. Dupre, H. Egiyan, L. El Fassi, P. Eugenio, G. Fedotov, S. Fegan, R. Fersch, J. A. Fleming, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, W. Gohn, E. Golovatch, R. W. Gothe, K. A. Griffioen, M. Guidal, K. Hafidi, H. Hakobyan, C. Hanretty, N. Harrison, D. Heddle, K. Hicks, D. Ho, M. Holtrop, C. E. Hyde, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, H. S. Jo, D. Keller, M. Khandaker, P. Khetarpal, A. Kim, W. Kim, A. Klein, F. J. Klein, S. Koirala, A. Kubarovsky, V. Kubarovsky, S. V. Kuleshov, N. D. Kvaltine, K. Livingston, H. Y. Lu, I. J D MacGregor, N. Markov, M. Mayer, M. McCracken, B. McKinnon, M. D. Mestayer, C. A. Meyer, M. Mirazita, T. Mineeva, V. Mokeev, R. A. Montgomery, E. Munevar, C. Munoz Camacho, P. Nadel-Turonski, R. Nasseripour, C. S. Nepali, S. Niccolai, G. Niculescu, I. Niculescu, M. Osipenko, A. I. Ostrovidov, L. L. Pappalardo, R. Paremuzyan, K. Park, S. Park, E. Pasyuk, E. Phelps, J. J. Phillips, S. Pisano, N. Pivnyuk, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, D. Protopopescu, D. Rimal, M. Ripani, Barry Ritchie, G. Rosner, P. Rossi, F. Sabatié, M. S. Saini, C. Salgado, D. Schott, E. Seder, H. Seraydaryan, Y. G. Sharabian, E. S. Smith, G. D. Smith, D. I. Sober, S. S. Stepanyan, S. Stepanyan, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, W. Tang, S. Taylor, C. E. Taylor, Ye Tian, S. Tkachenko, B. Torayev, M. Ungaro, B. Vernarsky, A. V. Vlassov, H. Voskanyan, E. Voutier, N. K. Walford, D. P. Watts, D. P. Weygand, M. Williams, N. Zachariou, L. Zana, J. Zhang, Z. W. Zhao, I. Zonta

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

The reaction γ+p→K++Σ+π was used to determine the invariant mass distributions or "line shapes" of the Σ+π-, Σ-π+, and Σ0π0 final states, from threshold at 1328 MeV/c2 through the mass range of the Λ(1405) and the Λ(1520). The measurements were made with the CLAS system at Jefferson Lab using tagged real photons, for center-of-mass energies 1.95<W<2.85 GeV. The three mass distributions differ strongly in the vicinity of the I=0 Λ(1405), indicating the presence of substantial I=1 strength in the reaction. Background contributions to the data from the Σ0(1385) and from K*Σ production were studied and shown to have negligible influence. To separate the isospin amplitudes, Breit-Wigner model fits were made that included channel-coupling distortions due to the NK̄ threshold. A best fit to all the data was obtained after including a phenomenological I=1, JP=1/2- amplitude with a centroid at 1394±20 MeV/c2 and a second I=1 amplitude at 1413±10 MeV/c2. The centroid of the I=0 Λ(1405) strength was found at the Σπ threshold, with the observed shape determined largely by channel coupling, leading to an apparent overall peak near 1405 MeV/c2.

Original languageEnglish (US)
Article number035206
JournalPhysical Review C - Nuclear Physics
Volume87
Issue number3
DOIs
StatePublished - Mar 15 2013

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photoproduction
line shape
mass distribution
centroids
thresholds
center of mass
photons
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Moriya, K., Schumacher, R. A., Adhikari, K. P., Adikaram, D., Aghasyan, M., Anderson, M. D., ... Zonta, I. (2013). Measurement of the Σπ photoproduction line shapes near the Λ(1405). Physical Review C - Nuclear Physics, 87(3), [035206]. https://doi.org/10.1103/PhysRevC.87.035206

Measurement of the Σπ photoproduction line shapes near the Λ(1405). / Moriya, K.; Schumacher, R. A.; Adhikari, K. P.; Adikaram, D.; Aghasyan, M.; Anderson, M. D.; Anefalos Pereira, S.; Ball, J.; Baltzell, N. A.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Bellis, M.; Biselli, A. S.; Bono, J.; Boiarinov, S.; Briscoe, W. J.; Burkert, V. D.; Carman, D. S.; Celentano, A.; Chandavar, S.; Charles, G.; Cole, P. L.; Collins, P.; Crede, V.; D'Angelo, A.; Dashyan, N.; De Sanctis, E.; De Vita, R.; Deur, A.; Dey, B.; Djalali, C.; Doughty, D.; Dupre, R.; Egiyan, H.; El Fassi, L.; Eugenio, P.; Fedotov, G.; Fegan, S.; Fersch, R.; Fleming, J. A.; Gevorgyan, N.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Gohn, W.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Hafidi, K.; Hakobyan, H.; Hanretty, C.; Harrison, N.; Heddle, D.; Hicks, K.; Ho, D.; Holtrop, M.; Hyde, C. E.; Ilieva, Y.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jo, H. S.; Keller, D.; Khandaker, M.; Khetarpal, P.; Kim, A.; Kim, W.; Klein, A.; Klein, F. J.; Koirala, S.; Kubarovsky, A.; Kubarovsky, V.; Kuleshov, S. V.; Kvaltine, N. D.; Livingston, K.; Lu, H. Y.; MacGregor, I. J D; Markov, N.; Mayer, M.; McCracken, M.; McKinnon, B.; Mestayer, M. D.; Meyer, C. A.; Mirazita, M.; Mineeva, T.; Mokeev, V.; Montgomery, R. A.; Munevar, E.; Munoz Camacho, C.; Nadel-Turonski, P.; Nasseripour, R.; Nepali, C. S.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Osipenko, M.; Ostrovidov, A. I.; Pappalardo, L. L.; Paremuzyan, R.; Park, K.; Park, S.; Pasyuk, E.; Phelps, E.; Phillips, J. J.; Pisano, S.; Pivnyuk, N.; Pogorelko, O.; Pozdniakov, S.; Price, J. W.; Procureur, S.; Protopopescu, D.; Rimal, D.; Ripani, M.; Ritchie, Barry; Rosner, G.; Rossi, P.; Sabatié, F.; Saini, M. S.; Salgado, C.; Schott, D.; Seder, E.; Seraydaryan, H.; Sharabian, Y. G.; Smith, E. S.; Smith, G. D.; Sober, D. I.; Stepanyan, S. S.; Stepanyan, S.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Taiuti, M.; Tang, W.; Taylor, S.; Taylor, C. E.; Tian, Ye; Tkachenko, S.; Torayev, B.; Ungaro, M.; Vernarsky, B.; Vlassov, A. V.; Voskanyan, H.; Voutier, E.; Walford, N. K.; Watts, D. P.; Weygand, D. P.; Williams, M.; Zachariou, N.; Zana, L.; Zhang, J.; Zhao, Z. W.; Zonta, I.

In: Physical Review C - Nuclear Physics, Vol. 87, No. 3, 035206, 15.03.2013.

Research output: Contribution to journalArticle

Moriya, K, Schumacher, RA, Adhikari, KP, Adikaram, D, Aghasyan, M, Anderson, MD, Anefalos Pereira, S, Ball, J, Baltzell, NA, Battaglieri, M, Batourine, V, Bedlinskiy, I, Bellis, M, Biselli, AS, Bono, J, Boiarinov, S, Briscoe, WJ, Burkert, VD, Carman, DS, Celentano, A, Chandavar, S, Charles, G, Cole, PL, Collins, P, Crede, V, D'Angelo, A, Dashyan, N, De Sanctis, E, De Vita, R, Deur, A, Dey, B, Djalali, C, Doughty, D, Dupre, R, Egiyan, H, El Fassi, L, Eugenio, P, Fedotov, G, Fegan, S, Fersch, R, Fleming, JA, Gevorgyan, N, Gilfoyle, GP, Giovanetti, KL, Girod, FX, Goetz, JT, Gohn, W, Golovatch, E, Gothe, RW, Griffioen, KA, Guidal, M, Hafidi, K, Hakobyan, H, Hanretty, C, Harrison, N, Heddle, D, Hicks, K, Ho, D, Holtrop, M, Hyde, CE, Ilieva, Y, Ireland, DG, Ishkhanov, BS, Isupov, EL, Jo, HS, Keller, D, Khandaker, M, Khetarpal, P, Kim, A, Kim, W, Klein, A, Klein, FJ, Koirala, S, Kubarovsky, A, Kubarovsky, V, Kuleshov, SV, Kvaltine, ND, Livingston, K, Lu, HY, MacGregor, IJD, Markov, N, Mayer, M, McCracken, M, McKinnon, B, Mestayer, MD, Meyer, CA, Mirazita, M, Mineeva, T, Mokeev, V, Montgomery, RA, Munevar, E, Munoz Camacho, C, Nadel-Turonski, P, Nasseripour, R, Nepali, CS, Niccolai, S, Niculescu, G, Niculescu, I, Osipenko, M, Ostrovidov, AI, Pappalardo, LL, Paremuzyan, R, Park, K, Park, S, Pasyuk, E, Phelps, E, Phillips, JJ, Pisano, S, Pivnyuk, N, Pogorelko, O, Pozdniakov, S, Price, JW, Procureur, S, Protopopescu, D, Rimal, D, Ripani, M, Ritchie, B, Rosner, G, Rossi, P, Sabatié, F, Saini, MS, Salgado, C, Schott, D, Seder, E, Seraydaryan, H, Sharabian, YG, Smith, ES, Smith, GD, Sober, DI, Stepanyan, SS, Stepanyan, S, Stoler, P, Strakovsky, II, Strauch, S, Taiuti, M, Tang, W, Taylor, S, Taylor, CE, Tian, Y, Tkachenko, S, Torayev, B, Ungaro, M, Vernarsky, B, Vlassov, AV, Voskanyan, H, Voutier, E, Walford, NK, Watts, DP, Weygand, DP, Williams, M, Zachariou, N, Zana, L, Zhang, J, Zhao, ZW & Zonta, I 2013, 'Measurement of the Σπ photoproduction line shapes near the Λ(1405)', Physical Review C - Nuclear Physics, vol. 87, no. 3, 035206. https://doi.org/10.1103/PhysRevC.87.035206
Moriya K, Schumacher RA, Adhikari KP, Adikaram D, Aghasyan M, Anderson MD et al. Measurement of the Σπ photoproduction line shapes near the Λ(1405). Physical Review C - Nuclear Physics. 2013 Mar 15;87(3). 035206. https://doi.org/10.1103/PhysRevC.87.035206
Moriya, K. ; Schumacher, R. A. ; Adhikari, K. P. ; Adikaram, D. ; Aghasyan, M. ; Anderson, M. D. ; Anefalos Pereira, S. ; Ball, J. ; Baltzell, N. A. ; Battaglieri, M. ; Batourine, V. ; Bedlinskiy, I. ; Bellis, M. ; Biselli, A. S. ; Bono, J. ; Boiarinov, S. ; Briscoe, W. J. ; Burkert, V. D. ; Carman, D. S. ; Celentano, A. ; Chandavar, S. ; Charles, G. ; Cole, P. L. ; Collins, P. ; Crede, V. ; D'Angelo, A. ; Dashyan, N. ; De Sanctis, E. ; De Vita, R. ; Deur, A. ; Dey, B. ; Djalali, C. ; Doughty, D. ; Dupre, R. ; Egiyan, H. ; El Fassi, L. ; Eugenio, P. ; Fedotov, G. ; Fegan, S. ; Fersch, R. ; Fleming, J. A. ; Gevorgyan, N. ; Gilfoyle, G. P. ; Giovanetti, K. L. ; Girod, F. X. ; Goetz, J. T. ; Gohn, W. ; Golovatch, E. ; Gothe, R. W. ; Griffioen, K. A. ; Guidal, M. ; Hafidi, K. ; Hakobyan, H. ; Hanretty, C. ; Harrison, N. ; Heddle, D. ; Hicks, K. ; Ho, D. ; Holtrop, M. ; Hyde, C. E. ; Ilieva, Y. ; Ireland, D. G. ; Ishkhanov, B. S. ; Isupov, E. L. ; Jo, H. S. ; Keller, D. ; Khandaker, M. ; Khetarpal, P. ; Kim, A. ; Kim, W. ; Klein, A. ; Klein, F. J. ; Koirala, S. ; Kubarovsky, A. ; Kubarovsky, V. ; Kuleshov, S. V. ; Kvaltine, N. D. ; Livingston, K. ; Lu, H. Y. ; MacGregor, I. J D ; Markov, N. ; Mayer, M. ; McCracken, M. ; McKinnon, B. ; Mestayer, M. D. ; Meyer, C. A. ; Mirazita, M. ; Mineeva, T. ; Mokeev, V. ; Montgomery, R. A. ; Munevar, E. ; Munoz Camacho, C. ; Nadel-Turonski, P. ; Nasseripour, R. ; Nepali, C. S. ; Niccolai, S. ; Niculescu, G. ; Niculescu, I. ; Osipenko, M. ; Ostrovidov, A. I. ; Pappalardo, L. L. ; Paremuzyan, R. ; Park, K. ; Park, S. ; Pasyuk, E. ; Phelps, E. ; Phillips, J. J. ; Pisano, S. ; Pivnyuk, N. ; Pogorelko, O. ; Pozdniakov, S. ; Price, J. W. ; Procureur, S. ; Protopopescu, D. ; Rimal, D. ; Ripani, M. ; Ritchie, Barry ; Rosner, G. ; Rossi, P. ; Sabatié, F. ; Saini, M. S. ; Salgado, C. ; Schott, D. ; Seder, E. ; Seraydaryan, H. ; Sharabian, Y. G. ; Smith, E. S. ; Smith, G. D. ; Sober, D. I. ; Stepanyan, S. S. ; Stepanyan, S. ; Stoler, P. ; Strakovsky, I. I. ; Strauch, S. ; Taiuti, M. ; Tang, W. ; Taylor, S. ; Taylor, C. E. ; Tian, Ye ; Tkachenko, S. ; Torayev, B. ; Ungaro, M. ; Vernarsky, B. ; Vlassov, A. V. ; Voskanyan, H. ; Voutier, E. ; Walford, N. K. ; Watts, D. P. ; Weygand, D. P. ; Williams, M. ; Zachariou, N. ; Zana, L. ; Zhang, J. ; Zhao, Z. W. ; Zonta, I. / Measurement of the Σπ photoproduction line shapes near the Λ(1405). In: Physical Review C - Nuclear Physics. 2013 ; Vol. 87, No. 3.
@article{91aa5fd3535242cda804778493155a0a,
title = "Measurement of the Σπ photoproduction line shapes near the Λ(1405)",
abstract = "The reaction γ+p→K++Σ+π was used to determine the invariant mass distributions or {"}line shapes{"} of the Σ+π-, Σ-π+, and Σ0π0 final states, from threshold at 1328 MeV/c2 through the mass range of the Λ(1405) and the Λ(1520). The measurements were made with the CLAS system at Jefferson Lab using tagged real photons, for center-of-mass energies 1.95<W<2.85 GeV. The three mass distributions differ strongly in the vicinity of the I=0 Λ(1405), indicating the presence of substantial I=1 strength in the reaction. Background contributions to the data from the Σ0(1385) and from K*Σ production were studied and shown to have negligible influence. To separate the isospin amplitudes, Breit-Wigner model fits were made that included channel-coupling distortions due to the NK̄ threshold. A best fit to all the data was obtained after including a phenomenological I=1, JP=1/2- amplitude with a centroid at 1394±20 MeV/c2 and a second I=1 amplitude at 1413±10 MeV/c2. The centroid of the I=0 Λ(1405) strength was found at the Σπ threshold, with the observed shape determined largely by channel coupling, leading to an apparent overall peak near 1405 MeV/c2.",
author = "K. Moriya and Schumacher, {R. A.} and Adhikari, {K. P.} and D. Adikaram and M. Aghasyan and Anderson, {M. D.} and {Anefalos Pereira}, S. and J. Ball and Baltzell, {N. A.} and M. Battaglieri and V. Batourine and I. Bedlinskiy and M. Bellis and Biselli, {A. S.} and J. Bono and S. Boiarinov and Briscoe, {W. J.} and Burkert, {V. D.} and Carman, {D. S.} and A. Celentano and S. Chandavar and G. Charles and Cole, {P. L.} and P. Collins and V. Crede and A. D'Angelo and N. Dashyan and {De Sanctis}, E. and {De Vita}, R. and A. Deur and B. Dey and C. Djalali and D. Doughty and R. Dupre and H. Egiyan and {El Fassi}, L. and P. Eugenio and G. Fedotov and S. Fegan and R. Fersch and Fleming, {J. A.} and N. Gevorgyan and Gilfoyle, {G. P.} and Giovanetti, {K. L.} and Girod, {F. X.} and Goetz, {J. T.} and W. Gohn and E. Golovatch and Gothe, {R. W.} and Griffioen, {K. A.} and M. Guidal and K. Hafidi and H. Hakobyan and C. Hanretty and N. Harrison and D. Heddle and K. Hicks and D. Ho and M. Holtrop and Hyde, {C. E.} and Y. Ilieva and Ireland, {D. G.} and Ishkhanov, {B. S.} and Isupov, {E. L.} and Jo, {H. S.} and D. Keller and M. Khandaker and P. Khetarpal and A. Kim and W. Kim and A. Klein and Klein, {F. J.} and S. Koirala and A. Kubarovsky and V. Kubarovsky and Kuleshov, {S. V.} and Kvaltine, {N. D.} and K. Livingston and Lu, {H. Y.} and MacGregor, {I. J D} and N. Markov and M. Mayer and M. McCracken and B. McKinnon and Mestayer, {M. D.} and Meyer, {C. A.} and M. Mirazita and T. Mineeva and V. Mokeev and Montgomery, {R. A.} and E. Munevar and {Munoz Camacho}, C. and P. Nadel-Turonski and R. Nasseripour and Nepali, {C. S.} and S. Niccolai and G. Niculescu and I. Niculescu and M. Osipenko and Ostrovidov, {A. I.} and Pappalardo, {L. L.} and R. Paremuzyan and K. Park and S. Park and E. Pasyuk and E. Phelps and Phillips, {J. J.} and S. Pisano and N. Pivnyuk and O. Pogorelko and S. Pozdniakov and Price, {J. W.} and S. Procureur and D. Protopopescu and D. Rimal and M. Ripani and Barry Ritchie and G. Rosner and P. Rossi and F. Sabati{\'e} and Saini, {M. S.} and C. Salgado and D. Schott and E. Seder and H. Seraydaryan and Sharabian, {Y. G.} and Smith, {E. S.} and Smith, {G. D.} and Sober, {D. I.} and Stepanyan, {S. S.} and S. Stepanyan and P. Stoler and Strakovsky, {I. I.} and S. Strauch and M. Taiuti and W. Tang and S. Taylor and Taylor, {C. E.} and Ye Tian and S. Tkachenko and B. Torayev and M. Ungaro and B. Vernarsky and Vlassov, {A. V.} and H. Voskanyan and E. Voutier and Walford, {N. K.} and Watts, {D. P.} and Weygand, {D. P.} and M. Williams and N. Zachariou and L. Zana and J. Zhang and Zhao, {Z. W.} and I. Zonta",
year = "2013",
month = "3",
day = "15",
doi = "10.1103/PhysRevC.87.035206",
language = "English (US)",
volume = "87",
journal = "Physical Review C - Nuclear Physics",
issn = "0556-2813",
publisher = "American Physical Society",
number = "3",

}

TY - JOUR

T1 - Measurement of the Σπ photoproduction line shapes near the Λ(1405)

AU - Moriya, K.

AU - Schumacher, R. A.

AU - Adhikari, K. P.

AU - Adikaram, D.

AU - Aghasyan, M.

AU - Anderson, M. D.

AU - Anefalos Pereira, S.

AU - Ball, J.

AU - Baltzell, N. A.

AU - Battaglieri, M.

AU - Batourine, V.

AU - Bedlinskiy, I.

AU - Bellis, M.

AU - Biselli, A. S.

AU - Bono, J.

AU - Boiarinov, S.

AU - Briscoe, W. J.

AU - Burkert, V. D.

AU - Carman, D. S.

AU - Celentano, A.

AU - Chandavar, S.

AU - Charles, G.

AU - Cole, P. L.

AU - Collins, P.

AU - Crede, V.

AU - D'Angelo, A.

AU - Dashyan, N.

AU - De Sanctis, E.

AU - De Vita, R.

AU - Deur, A.

AU - Dey, B.

AU - Djalali, C.

AU - Doughty, D.

AU - Dupre, R.

AU - Egiyan, H.

AU - El Fassi, L.

AU - Eugenio, P.

AU - Fedotov, G.

AU - Fegan, S.

AU - Fersch, R.

AU - Fleming, J. A.

AU - Gevorgyan, N.

AU - Gilfoyle, G. P.

AU - Giovanetti, K. L.

AU - Girod, F. X.

AU - Goetz, J. T.

AU - Gohn, W.

AU - Golovatch, E.

AU - Gothe, R. W.

AU - Griffioen, K. A.

AU - Guidal, M.

AU - Hafidi, K.

AU - Hakobyan, H.

AU - Hanretty, C.

AU - Harrison, N.

AU - Heddle, D.

AU - Hicks, K.

AU - Ho, D.

AU - Holtrop, M.

AU - Hyde, C. E.

AU - Ilieva, Y.

AU - Ireland, D. G.

AU - Ishkhanov, B. S.

AU - Isupov, E. L.

AU - Jo, H. S.

AU - Keller, D.

AU - Khandaker, M.

AU - Khetarpal, P.

AU - Kim, A.

AU - Kim, W.

AU - Klein, A.

AU - Klein, F. J.

AU - Koirala, S.

AU - Kubarovsky, A.

AU - Kubarovsky, V.

AU - Kuleshov, S. V.

AU - Kvaltine, N. D.

AU - Livingston, K.

AU - Lu, H. Y.

AU - MacGregor, I. J D

AU - Markov, N.

AU - Mayer, M.

AU - McCracken, M.

AU - McKinnon, B.

AU - Mestayer, M. D.

AU - Meyer, C. A.

AU - Mirazita, M.

AU - Mineeva, T.

AU - Mokeev, V.

AU - Montgomery, R. A.

AU - Munevar, E.

AU - Munoz Camacho, C.

AU - Nadel-Turonski, P.

AU - Nasseripour, R.

AU - Nepali, C. S.

AU - Niccolai, S.

AU - Niculescu, G.

AU - Niculescu, I.

AU - Osipenko, M.

AU - Ostrovidov, A. I.

AU - Pappalardo, L. L.

AU - Paremuzyan, R.

AU - Park, K.

AU - Park, S.

AU - Pasyuk, E.

AU - Phelps, E.

AU - Phillips, J. J.

AU - Pisano, S.

AU - Pivnyuk, N.

AU - Pogorelko, O.

AU - Pozdniakov, S.

AU - Price, J. W.

AU - Procureur, S.

AU - Protopopescu, D.

AU - Rimal, D.

AU - Ripani, M.

AU - Ritchie, Barry

AU - Rosner, G.

AU - Rossi, P.

AU - Sabatié, F.

AU - Saini, M. S.

AU - Salgado, C.

AU - Schott, D.

AU - Seder, E.

AU - Seraydaryan, H.

AU - Sharabian, Y. G.

AU - Smith, E. S.

AU - Smith, G. D.

AU - Sober, D. I.

AU - Stepanyan, S. S.

AU - Stepanyan, S.

AU - Stoler, P.

AU - Strakovsky, I. I.

AU - Strauch, S.

AU - Taiuti, M.

AU - Tang, W.

AU - Taylor, S.

AU - Taylor, C. E.

AU - Tian, Ye

AU - Tkachenko, S.

AU - Torayev, B.

AU - Ungaro, M.

AU - Vernarsky, B.

AU - Vlassov, A. V.

AU - Voskanyan, H.

AU - Voutier, E.

AU - Walford, N. K.

AU - Watts, D. P.

AU - Weygand, D. P.

AU - Williams, M.

AU - Zachariou, N.

AU - Zana, L.

AU - Zhang, J.

AU - Zhao, Z. W.

AU - Zonta, I.

PY - 2013/3/15

Y1 - 2013/3/15

N2 - The reaction γ+p→K++Σ+π was used to determine the invariant mass distributions or "line shapes" of the Σ+π-, Σ-π+, and Σ0π0 final states, from threshold at 1328 MeV/c2 through the mass range of the Λ(1405) and the Λ(1520). The measurements were made with the CLAS system at Jefferson Lab using tagged real photons, for center-of-mass energies 1.95<W<2.85 GeV. The three mass distributions differ strongly in the vicinity of the I=0 Λ(1405), indicating the presence of substantial I=1 strength in the reaction. Background contributions to the data from the Σ0(1385) and from K*Σ production were studied and shown to have negligible influence. To separate the isospin amplitudes, Breit-Wigner model fits were made that included channel-coupling distortions due to the NK̄ threshold. A best fit to all the data was obtained after including a phenomenological I=1, JP=1/2- amplitude with a centroid at 1394±20 MeV/c2 and a second I=1 amplitude at 1413±10 MeV/c2. The centroid of the I=0 Λ(1405) strength was found at the Σπ threshold, with the observed shape determined largely by channel coupling, leading to an apparent overall peak near 1405 MeV/c2.

AB - The reaction γ+p→K++Σ+π was used to determine the invariant mass distributions or "line shapes" of the Σ+π-, Σ-π+, and Σ0π0 final states, from threshold at 1328 MeV/c2 through the mass range of the Λ(1405) and the Λ(1520). The measurements were made with the CLAS system at Jefferson Lab using tagged real photons, for center-of-mass energies 1.95<W<2.85 GeV. The three mass distributions differ strongly in the vicinity of the I=0 Λ(1405), indicating the presence of substantial I=1 strength in the reaction. Background contributions to the data from the Σ0(1385) and from K*Σ production were studied and shown to have negligible influence. To separate the isospin amplitudes, Breit-Wigner model fits were made that included channel-coupling distortions due to the NK̄ threshold. A best fit to all the data was obtained after including a phenomenological I=1, JP=1/2- amplitude with a centroid at 1394±20 MeV/c2 and a second I=1 amplitude at 1413±10 MeV/c2. The centroid of the I=0 Λ(1405) strength was found at the Σπ threshold, with the observed shape determined largely by channel coupling, leading to an apparent overall peak near 1405 MeV/c2.

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U2 - 10.1103/PhysRevC.87.035206

DO - 10.1103/PhysRevC.87.035206

M3 - Article

VL - 87

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 3

M1 - 035206

ER -