Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

J. Barrette; R. Bellwied; P. Braun-Munzinger; W. E. Cleland; T. M. Cormier; G. David; J. Dee; G. E. Diebold; O. Dietzsch; J. V. Germani; S. Gilbert; S. V. Greene; J. R. Hall; T. K. Hemmick; N. Herrmann; B. Hong; K. Jayananda; D. Kraus; B. S. Kumar; R. Lacasse; D. Lissauer; W. J. Llope; T. W. Ludlam; S. McCorkle; R. Majka; S. K. Mark; J. T. Mitchell; M. Muthuswamy; E. O'Brien; C. Pruneau; M. N. Rao; F. Rotondo; N. C. daSilva; U. Sonnadara; J. Stachel; H. Takai; E. M. Takagui; T. G. Throwe; G. Wang; D. Wolfe; C. L. Woody; N. Xu; Y. Zhang; Z. Zhang; C. Zou

doi:10.1016/0370-2693(95)00329-J

Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

J. Barrette, R. Bellwied, P. Braun-Munzinger, W. E. Cleland, T. M. Cormier, G. David, J. Dee, G. E. Diebold, O. Dietzsch, J. V. Germani, S. Gilbert, S. V. Greene, J. R. Hall, T. K. Hemmick, N. Herrmann, B. Hong, K. Jayananda, D. Kraus, B. S. Kumar, R. LacasseD. Lissauer, W. J. Llope, T. W. Ludlam, S. McCorkle, R. Majka, S. K. Mark, J. T. Mitchell, M. Muthuswamy, E. O'Brien, C. Pruneau, M. N. Rao, F. Rotondo, N. C. daSilva, U. Sonnadara, J. Stachel, H. Takai, E. M. Takagui, T. G. Throwe, G. Wang, D. Wolfe, C. L. Woody, N. Xu, Y. Zhang, Z. Zhang, C. Zou

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Abstract

We present measurements of pion transverse momentum (p_t) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for p_t down to and including p_t = 0. The data exhibit an enhanced pion yield at low p_t compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Δ resonance abundance at freeze-out. The results are consistent with a direct measurement of the Δ resonance yield by reconstruction of proton-pion pairs and imply a temperature of the system at freeze-out close to 140 MeV.

Original language	English
Pages (from-to)	93-98
Number of pages	6
Journal	Physics Letters B
Volume	351
Issue number	1-3
DOIs	https://doi.org/10.1016/0370-2693(95)00329-J
Publication status	Published - 1995 May 25
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/0370-2693(95)00329-J

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Barrette, J., Bellwied, R., Braun-Munzinger, P., Cleland, W. E., Cormier, T. M., David, G., Dee, J., Diebold, G. E., Dietzsch, O., Germani, J. V., Gilbert, S., Greene, S. V., Hall, J. R., Hemmick, T. K., Herrmann, N., Hong, B., Jayananda, K., Kraus, D., Kumar, B. S., ... Zou, C. (1995). Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy. Physics Letters B, 351(1-3), 93-98. https://doi.org/10.1016/0370-2693(95)00329-J

Barrette, J, Bellwied, R, Braun-Munzinger, P, Cleland, WE, Cormier, TM, David, G, Dee, J, Diebold, GE, Dietzsch, O, Germani, JV, Gilbert, S, Greene, SV, Hall, JR, Hemmick, TK, Herrmann, N, Hong, B, Jayananda, K, Kraus, D, Kumar, BS, Lacasse, R, Lissauer, D, Llope, WJ, Ludlam, TW, McCorkle, S, Majka, R, Mark, SK, Mitchell, JT, Muthuswamy, M, O'Brien, E, Pruneau, C, Rao, MN, Rotondo, F, daSilva, NC, Sonnadara, U, Stachel, J, Takai, H, Takagui, EM, Throwe, TG, Wang, G, Wolfe, D, Woody, CL, Xu, N, Zhang, Y, Zhang, Z & Zou, C 1995, 'Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy', Physics Letters B, vol. 351, no. 1-3, pp. 93-98. https://doi.org/10.1016/0370-2693(95)00329-J

@article{e5c07baa45474e64abeb66b3958425da,

title = "Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy",

abstract = "We present measurements of pion transverse momentum (pt) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for pt down to and including pt = 0. The data exhibit an enhanced pion yield at low pt compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Δ resonance abundance at freeze-out. The results are consistent with a direct measurement of the Δ resonance yield by reconstruction of proton-pion pairs and imply a temperature of the system at freeze-out close to 140 MeV.",

author = "J. Barrette and R. Bellwied and P. Braun-Munzinger and Cleland, {W. E.} and Cormier, {T. M.} and G. David and J. Dee and Diebold, {G. E.} and O. Dietzsch and Germani, {J. V.} and S. Gilbert and Greene, {S. V.} and Hall, {J. R.} and Hemmick, {T. K.} and N. Herrmann and B. Hong and K. Jayananda and D. Kraus and Kumar, {B. S.} and R. Lacasse and D. Lissauer and Llope, {W. J.} and Ludlam, {T. W.} and S. McCorkle and R. Majka and Mark, {S. K.} and Mitchell, {J. T.} and M. Muthuswamy and E. O'Brien and C. Pruneau and Rao, {M. N.} and F. Rotondo and daSilva, {N. C.} and U. Sonnadara and J. Stachel and H. Takai and Takagui, {E. M.} and Throwe, {T. G.} and G. Wang and D. Wolfe and Woody, {C. L.} and N. Xu and Y. Zhang and Z. Zhang and C. Zou",

note = "Funding Information: We wish to thankt he BrookhavenT andema nd AGS staff for theire xcellents upporta rep articularly gratefufl or the experth elp of W. McGaherna ndD r. H. Brown. R. Hutter and J. Sonderickerp rovided importantt echnicals upport.W e thankD r. R. Mat- tie110fo r helpful discussionsF. inancials upportb y the US DOE, the NSF, the CanadianN SERC, and CNPq Brazil is acknowledged.",

year = "1995",

month = may,

day = "25",

doi = "10.1016/0370-2693(95)00329-J",

language = "English",

volume = "351",

pages = "93--98",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "1-3",

}

TY - JOUR

T1 - Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

AU - Barrette, J.

AU - Bellwied, R.

AU - Braun-Munzinger, P.

AU - Cleland, W. E.

AU - Cormier, T. M.

AU - David, G.

AU - Dee, J.

AU - Diebold, G. E.

AU - Dietzsch, O.

AU - Germani, J. V.

AU - Gilbert, S.

AU - Greene, S. V.

AU - Hall, J. R.

AU - Hemmick, T. K.

AU - Herrmann, N.

AU - Hong, B.

AU - Jayananda, K.

AU - Kraus, D.

AU - Kumar, B. S.

AU - Lacasse, R.

AU - Lissauer, D.

AU - Llope, W. J.

AU - Ludlam, T. W.

AU - McCorkle, S.

AU - Majka, R.

AU - Mark, S. K.

AU - Mitchell, J. T.

AU - Muthuswamy, M.

AU - O'Brien, E.

AU - Pruneau, C.

AU - Rao, M. N.

AU - Rotondo, F.

AU - daSilva, N. C.

AU - Sonnadara, U.

AU - Stachel, J.

AU - Takai, H.

AU - Takagui, E. M.

AU - Throwe, T. G.

AU - Wang, G.

AU - Wolfe, D.

AU - Woody, C. L.

AU - Xu, N.

AU - Zhang, Y.

AU - Zhang, Z.

AU - Zou, C.

N1 - Funding Information: We wish to thankt he BrookhavenT andema nd AGS staff for theire xcellents upporta rep articularly gratefufl or the experth elp of W. McGaherna ndD r. H. Brown. R. Hutter and J. Sonderickerp rovided importantt echnicals upport.W e thankD r. R. Mat- tie110fo r helpful discussionsF. inancials upportb y the US DOE, the NSF, the CanadianN SERC, and CNPq Brazil is acknowledged.

PY - 1995/5/25

Y1 - 1995/5/25

N2 - We present measurements of pion transverse momentum (pt) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for pt down to and including pt = 0. The data exhibit an enhanced pion yield at low pt compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Δ resonance abundance at freeze-out. The results are consistent with a direct measurement of the Δ resonance yield by reconstruction of proton-pion pairs and imply a temperature of the system at freeze-out close to 140 MeV.

AB - We present measurements of pion transverse momentum (pt) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for pt down to and including pt = 0. The data exhibit an enhanced pion yield at low pt compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Δ resonance abundance at freeze-out. The results are consistent with a direct measurement of the Δ resonance yield by reconstruction of proton-pion pairs and imply a temperature of the system at freeze-out close to 140 MeV.

UR - http://www.scopus.com/inward/record.url?scp=0002964786&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(95)00329-J

DO - 10.1016/0370-2693(95)00329-J

M3 - Article

AN - SCOPUS:0002964786

VL - 351

SP - 93

EP - 98

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 1-3

ER -

Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

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