Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)

CLAS Collaboration; 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; 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; D. P. Watts

doi:10.1103/PhysRevC.87.035206

Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)

CLAS Collaboration, 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. CarmanA. Celentano, 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, D. P. Watts

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract / Description of output

The reaction gamma + p -> K+ + Sigma + pi was used to determine the invariant mass distributions or "line shapes" of the Sigma(+) pi-, Sigma - pi(+), and Sigma(0)pi(0) final states, from threshold at 1328 MeV/c(2) through the mass range of the Lambda(1405) and the Lambda(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 Lambda(1405), indicating the presence of substantial I = 1 strength in the reaction. Background contributions to the data from the Sigma(0)(1385) and from K*Sigma 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 N (K) over bar threshold. A best fit to all the data was obtained after including a phenomenological I = 1, J(P) = 1/2(-) amplitude with a centroid at 1394 +/- 20 MeV/c(2) and a second I = 1 amplitude at 1413 +/- 10 MeV/c(2). The centroid of the I = 0 Lambda(1405) strength was found at the Sigma pi threshold, with the observed shape determined largely by channel coupling, leading to an apparent overall peak near 1405 MeV/c(2).

Original language	English
Article number	035206
Number of pages	24
Journal	Physical Review C
Volume	87
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevC.87.035206
Publication status	Published - 15 Mar 2013

Keywords / Materials (for Non-textual outputs)

KAON-NUCLEON INTERACTIONS
CHIRAL DYNAMICS
QUARK-MODEL
BARYONS
RESONANCES
STATES

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10.1103/PhysRevC.87.035206

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CLAS Collaboration, Moriya, K., Schumacher, R. A., Adhikari, K. P., Adikaram, D., Aghasyan, M., Anderson, M. D., Pereira, S. A., 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., ... Watts, D. P. (2013). Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405). Physical Review C, 87(3), Article 035206. https://doi.org/10.1103/PhysRevC.87.035206

@article{277d1ca7e0374ebeaf5c6e9e5d8c3f73,

title = "Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)",

abstract = "The reaction gamma + p -> K+ + Sigma + pi was used to determine the invariant mass distributions or {"}line shapes{"} of the Sigma(+) pi-, Sigma - pi(+), and Sigma(0)pi(0) final states, from threshold at 1328 MeV/c(2) through the mass range of the Lambda(1405) and the Lambda(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 Lambda(1405), indicating the presence of substantial I = 1 strength in the reaction. Background contributions to the data from the Sigma(0)(1385) and from K*Sigma 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 N (K) over bar threshold. A best fit to all the data was obtained after including a phenomenological I = 1, J(P) = 1/2(-) amplitude with a centroid at 1394 +/- 20 MeV/c(2) and a second I = 1 amplitude at 1413 +/- 10 MeV/c(2). The centroid of the I = 0 Lambda(1405) strength was found at the Sigma pi threshold, with the observed shape determined largely by channel coupling, leading to an apparent overall peak near 1405 MeV/c(2).",

keywords = "KAON-NUCLEON INTERACTIONS, CHIRAL DYNAMICS, QUARK-MODEL, BARYONS, RESONANCES, STATES",

author = "{CLAS Collaboration} and K. Moriya and Schumacher, {R. A.} and Adhikari, {K. P.} and D. Adikaram and M. Aghasyan and Anderson, {M. D.} and Pereira, {S. Anefalos} 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 Watts, {D. P.}",

year = "2013",

month = mar,

day = "15",

doi = "10.1103/PhysRevC.87.035206",

language = "English",

volume = "87",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "American Physical Society",

number = "3",

}

CLAS Collaboration, Moriya, K, Schumacher, RA, Adhikari, KP, Adikaram, D, Aghasyan, M, Anderson, MD, Pereira, SA, 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 & Watts, DP 2013, 'Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)', Physical Review C, vol. 87, no. 3, 035206. https://doi.org/10.1103/PhysRevC.87.035206

TY - JOUR

T1 - Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)

AU - CLAS Collaboration

AU - Moriya, K.

AU - Schumacher, R. A.

AU - Adhikari, K. P.

AU - Adikaram, D.

AU - Aghasyan, M.

AU - Anderson, M. D.

AU - Pereira, S. Anefalos

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 - Watts, D. P.

PY - 2013/3/15

Y1 - 2013/3/15

N2 - The reaction gamma + p -> K+ + Sigma + pi was used to determine the invariant mass distributions or "line shapes" of the Sigma(+) pi-, Sigma - pi(+), and Sigma(0)pi(0) final states, from threshold at 1328 MeV/c(2) through the mass range of the Lambda(1405) and the Lambda(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 Lambda(1405), indicating the presence of substantial I = 1 strength in the reaction. Background contributions to the data from the Sigma(0)(1385) and from K*Sigma 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 N (K) over bar threshold. A best fit to all the data was obtained after including a phenomenological I = 1, J(P) = 1/2(-) amplitude with a centroid at 1394 +/- 20 MeV/c(2) and a second I = 1 amplitude at 1413 +/- 10 MeV/c(2). The centroid of the I = 0 Lambda(1405) strength was found at the Sigma pi threshold, with the observed shape determined largely by channel coupling, leading to an apparent overall peak near 1405 MeV/c(2).

AB - The reaction gamma + p -> K+ + Sigma + pi was used to determine the invariant mass distributions or "line shapes" of the Sigma(+) pi-, Sigma - pi(+), and Sigma(0)pi(0) final states, from threshold at 1328 MeV/c(2) through the mass range of the Lambda(1405) and the Lambda(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 Lambda(1405), indicating the presence of substantial I = 1 strength in the reaction. Background contributions to the data from the Sigma(0)(1385) and from K*Sigma 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 N (K) over bar threshold. A best fit to all the data was obtained after including a phenomenological I = 1, J(P) = 1/2(-) amplitude with a centroid at 1394 +/- 20 MeV/c(2) and a second I = 1 amplitude at 1413 +/- 10 MeV/c(2). The centroid of the I = 0 Lambda(1405) strength was found at the Sigma pi threshold, with the observed shape determined largely by channel coupling, leading to an apparent overall peak near 1405 MeV/c(2).

KW - KAON-NUCLEON INTERACTIONS

KW - CHIRAL DYNAMICS

KW - QUARK-MODEL

KW - BARYONS

KW - RESONANCES

KW - STATES

U2 - 10.1103/PhysRevC.87.035206

DO - 10.1103/PhysRevC.87.035206

M3 - Article

SN - 0556-2813

VL - 87

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 035206

ER -

Measurement of the Sigma pi photoproduction line shapes near the Lambda(1405)

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Keywords / Materials (for Non-textual outputs)

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