Comparison of particle production in quark and gluon fragmentation at s∼10GeV

R. A. Briere; T. Ferguson; G. Tatishvili; H. Vogel; M. E. Watkins; J. L. Rosner; N. E. Adam; J. P. Alexander; D. G. Cassel; J. E. Duboscq; R. Ehrlich; L. Fields; R. S. Galik; L. Gibbons; R. Gray; S. W. Gray; D. L. Hartill; B. K. Heltsley; D. Hertz; C. D. Jones; J. Kandaswamy; D. L. Kreinick; V. E. Kuznetsov; H. Mahlke-Krüger; P. U E Onyisi; J. R. Patterson; D. Peterson; J. Pivarski; D. Riley; A. Ryd; A. J. Sadoff; H. Schwarthoff; X. Shi; S. Stroiney; W. M. Sun; T. Wilksen; M. Weinberger; S. B. Athar; R. Patel; V. Potlia; J. Yelton; P. Rubin; C. Cawlfield; B. I. Eisenstein; I. Karliner; D. Kim; N. Lowrey; P. Naik; M. Selen; E. J. White; J. Wiss; R. E. Mitchell; M. R. Shepherd; D. Besson; H. K. Swift; T. K. Pedlar; D. Cronin-Hennessy; K. Y. Gao; J. Hietala; Y. Kubota; T. Klein; B. W. Lang; R. Poling; A. W. Scott; A. Smith; P. Zweber; S. Dobbs; Z. Metreveli; K. K. Seth; A. Tomaradze; J. Ernst; K. M. Ecklund; H. Severini; W. Love; V. Savinov; O. Aquines; Z. Li; A. Lopez; S. Mehrabyan; H. Mendez; J. Ramirez; G. S. Huang; D. H. Miller; V. Pavlunin; B. Sanghi; I. P J Shipsey; B. Xin; G. S. Adams; M. Anderson; J. P. Cummings; I. Danko; D. Hu; B. Moziak; J. Napolitano; Q. He; J. Insler; H. Muramatsu; C. S. Park; E. H. Thorndike; F. Yang; T. E. Coan; Y. S. Gao; M. Artuso; S. Blusk; J. Butt; J. Li; N. Menaa; G. C. Moneti; R. Mountain; S. Nisar; K. Randrianarivony; R. Sia; T. Skwarnicki; S. Stone; J. C. Wang; K. Zhang; G. Bonvicini; D. Cinabro; M. Dubrovin; A. Lincoln; D. M. Asner; K. W. Edwards

doi:10.1103/PhysRevD.76.012005

Comparison of particle production in quark and gluon fragmentation at s∼10GeV

R. A. Briere, T. Ferguson, G. Tatishvili, H. Vogel, M. E. Watkins, J. L. Rosner, N. E. Adam, J. P. Alexander, D. G. Cassel, J. E. Duboscq, R. Ehrlich, L. Fields, R. S. Galik, L. Gibbons, R. Gray, S. W. Gray, D. L. Hartill, B. K. Heltsley, D. Hertz, C. D. JonesJ. Kandaswamy, D. L. Kreinick, V. E. Kuznetsov, H. Mahlke-Krüger, P. U E Onyisi, J. R. Patterson, D. Peterson, J. Pivarski, D. Riley, A. Ryd, A. J. Sadoff, H. Schwarthoff, X. Shi, S. Stroiney, W. M. Sun, T. Wilksen, M. Weinberger, S. B. Athar, R. Patel, V. Potlia, J. Yelton, P. Rubin, C. Cawlfield, B. I. Eisenstein, I. Karliner, D. Kim, N. Lowrey, P. Naik, M. Selen, E. J. White, J. Wiss, R. E. Mitchell, M. R. Shepherd, D. Besson, H. K. Swift, T. K. Pedlar, D. Cronin-Hennessy, K. Y. Gao, J. Hietala, Y. Kubota, T. Klein, B. W. Lang, R. Poling, A. W. Scott, A. Smith, P. Zweber, S. Dobbs, Z. Metreveli, K. K. Seth, A. Tomaradze, J. Ernst, K. M. Ecklund, H. Severini, W. Love, V. Savinov, O. Aquines, Z. Li, A. Lopez, S. Mehrabyan, H. Mendez, J. Ramirez, G. S. Huang, D. H. Miller, V. Pavlunin, B. Sanghi, I. P J Shipsey, B. Xin, G. S. Adams, M. Anderson, J. P. Cummings, I. Danko, D. Hu, B. Moziak, J. Napolitano, Q. He, J. Insler, H. Muramatsu, C. S. Park, E. H. Thorndike, F. Yang, T. E. Coan, Y. S. Gao, M. Artuso, S. Blusk, J. Butt, J. Li, N. Menaa, G. C. Moneti, R. Mountain, S. Nisar, K. Randrianarivony, R. Sia, T. Skwarnicki, S. Stone, J. C. Wang, K. Zhang, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Lincoln, D. M. Asner, K. W. Edwards

Physics and Astronomy (Twin Cities)

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Abstract

Using e+e-→hadrons data collected with the CLEO-III detector at the Cornell Electron Storage Ring, we study the inclusive production of baryons/antibaryons (p,Λ) and mesons ( and f2(1270)) in gluon-fragmentation and quark-fragmentation processes. We first corroborate previous per-event total particle yields in Υ(1S)→ggg compared with nearby continuum (e+e-→qq̄) indicating greater (∼×2) per-event yields of baryons in 3-gluon fragmentation. We find similar results when we extend that comparison to include the Υ(2S) and Υ(3S) resonances. With higher statistics, we now also probe the momentum dependence of these per-event particle yields. Next, we compare particle production in the photon-tagged process Υ(1S)→ggγ with that in e+e-→qq̄γ events, to allow comparison of two-parton with three-parton particle-specific fragmentation. For each particle, we determine the "enhancement" ratio, defined as the ratio of particle yields per gluon-fragmentation event compared to quark-fragmentation event. Thus defined, an enhancement of 1.0 implies equal per-event production in gluon and quark fragmentation. In the photon-tagged analysis (Υ(1S)→ggγ compared to e+e-→qq̄γ), we find almost no enhancement for protons (∼1.2±0.1), but a significant enhancement (∼1.9±0.3) for Λ's. This small measured proton enhancement rate is supported by a study of baryon production in χb2→gg→p+X relative to χb1→qq̄g→p+X. Overall, per-event baryon production in radiative two-gluon fragmentation is somewhat smaller than that observed in three-gluon decays of the Υ(1S). Our results for baryon production are inconsistent with the predictions of the JETSET (7.3) fragmentation model.

Original language	English (US)
Article number	012005
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	76
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevD.76.012005
State	Published - Jul 27 2007

Bibliographical note

Funding Information:
W. Cai appreciates the assistance from Keonwook Kang and Seunghwa Ryu in constructing the case studies and acknowledges support by NSF grant CMS-0547681, AFOSR grant FA9550-07-1-0464, and the Army High Performance Computing Research Center at Stanford. J. Li acknowledges support by NSF grant CMMI-0728069 and DMR-1008104, MRSEC grant DMR-0520020, and AFOSR grant FA9550-08-1-0325.

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Briere, R. A., Ferguson, T., Tatishvili, G., Vogel, H., Watkins, M. E., Rosner, J. L., Adam, N. E., Alexander, J. P., Cassel, D. G., Duboscq, J. E., Ehrlich, R., Fields, L., Galik, R. S., Gibbons, L., Gray, R., Gray, S. W., Hartill, D. L., Heltsley, B. K., Hertz, D., ... Edwards, K. W. (2007). Comparison of particle production in quark and gluon fragmentation at s∼10GeV. Physical Review D - Particles, Fields, Gravitation and Cosmology, 76(1), Article 012005. https://doi.org/10.1103/PhysRevD.76.012005

Briere, RA, Ferguson, T, Tatishvili, G, Vogel, H, Watkins, ME, Rosner, JL, Adam, NE, Alexander, JP, Cassel, DG, Duboscq, JE, Ehrlich, R, Fields, L, Galik, RS, Gibbons, L, Gray, R, Gray, SW, Hartill, DL, Heltsley, BK, Hertz, D, Jones, CD, Kandaswamy, J, Kreinick, DL, Kuznetsov, VE, Mahlke-Krüger, H, Onyisi, PUE, Patterson, JR, Peterson, D, Pivarski, J, Riley, D, Ryd, A, Sadoff, AJ, Schwarthoff, H, Shi, X, Stroiney, S, Sun, WM, Wilksen, T, Weinberger, M, Athar, SB, Patel, R, Potlia, V, Yelton, J, Rubin, P, Cawlfield, C, Eisenstein, BI, Karliner, I, Kim, D, Lowrey, N, Naik, P, Selen, M, White, EJ, Wiss, J, Mitchell, RE, Shepherd, MR, Besson, D, Swift, HK, Pedlar, TK, Cronin-Hennessy, D, Gao, KY, Hietala, J, Kubota, Y, Klein, T, Lang, BW, Poling, R, Scott, AW, Smith, A, Zweber, P, Dobbs, S, Metreveli, Z, Seth, KK, Tomaradze, A, Ernst, J, Ecklund, KM, Severini, H, Love, W, Savinov, V, Aquines, O, Li, Z, Lopez, A, Mehrabyan, S, Mendez, H, Ramirez, J, Huang, GS, Miller, DH, Pavlunin, V, Sanghi, B, Shipsey, IPJ, Xin, B, Adams, GS, Anderson, M, Cummings, JP, Danko, I, Hu, D, Moziak, B, Napolitano, J, He, Q, Insler, J, Muramatsu, H, Park, CS, Thorndike, EH, Yang, F, Coan, TE, Gao, YS, Artuso, M, Blusk, S, Butt, J, Li, J, Menaa, N, Moneti, GC, Mountain, R, Nisar, S, Randrianarivony, K, Sia, R, Skwarnicki, T, Stone, S, Wang, JC, Zhang, K, Bonvicini, G, Cinabro, D, Dubrovin, M, Lincoln, A, Asner, DM & Edwards, KW 2007, 'Comparison of particle production in quark and gluon fragmentation at s∼10GeV', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 76, no. 1, 012005. https://doi.org/10.1103/PhysRevD.76.012005

@article{ccbc79b4e11f425f99da58c81c1729a6,

title = "Comparison of particle production in quark and gluon fragmentation at s∼10GeV",

abstract = "Using e+e-→hadrons data collected with the CLEO-III detector at the Cornell Electron Storage Ring, we study the inclusive production of baryons/antibaryons (p,Λ) and mesons ( and f2(1270)) in gluon-fragmentation and quark-fragmentation processes. We first corroborate previous per-event total particle yields in Υ(1S)→ggg compared with nearby continuum (e+e-→q{\=q}) indicating greater (∼×2) per-event yields of baryons in 3-gluon fragmentation. We find similar results when we extend that comparison to include the Υ(2S) and Υ(3S) resonances. With higher statistics, we now also probe the momentum dependence of these per-event particle yields. Next, we compare particle production in the photon-tagged process Υ(1S)→ggγ with that in e+e-→q{\=q}γ events, to allow comparison of two-parton with three-parton particle-specific fragmentation. For each particle, we determine the {"}enhancement{"} ratio, defined as the ratio of particle yields per gluon-fragmentation event compared to quark-fragmentation event. Thus defined, an enhancement of 1.0 implies equal per-event production in gluon and quark fragmentation. In the photon-tagged analysis (Υ(1S)→ggγ compared to e+e-→q{\=q}γ), we find almost no enhancement for protons (∼1.2±0.1), but a significant enhancement (∼1.9±0.3) for Λ's. This small measured proton enhancement rate is supported by a study of baryon production in χb2→gg→p+X relative to χb1→q{\=q}g→p+X. Overall, per-event baryon production in radiative two-gluon fragmentation is somewhat smaller than that observed in three-gluon decays of the Υ(1S). Our results for baryon production are inconsistent with the predictions of the JETSET (7.3) fragmentation model.",

author = "Briere, {R. A.} and T. Ferguson and G. Tatishvili and H. Vogel and Watkins, {M. E.} and Rosner, {J. L.} and Adam, {N. E.} and Alexander, {J. P.} and Cassel, {D. G.} and Duboscq, {J. E.} and R. Ehrlich and L. Fields and Galik, {R. S.} and L. Gibbons and R. Gray and Gray, {S. W.} and Hartill, {D. L.} and Heltsley, {B. K.} and D. Hertz and Jones, {C. D.} and J. Kandaswamy and Kreinick, {D. L.} and Kuznetsov, {V. E.} and H. Mahlke-Kr{\"u}ger and Onyisi, {P. U E} and Patterson, {J. R.} and D. Peterson and J. Pivarski and D. Riley and A. Ryd and Sadoff, {A. J.} and H. Schwarthoff and X. Shi and S. Stroiney and Sun, {W. M.} and T. Wilksen and M. Weinberger and Athar, {S. B.} and R. Patel and V. Potlia and J. Yelton and P. Rubin and C. Cawlfield and Eisenstein, {B. I.} and I. Karliner and D. Kim and N. Lowrey and P. Naik and M. Selen and White, {E. J.} and J. Wiss and Mitchell, {R. E.} and Shepherd, {M. R.} and D. Besson and Swift, {H. K.} and Pedlar, {T. K.} and D. Cronin-Hennessy and Gao, {K. Y.} and J. Hietala and Y. Kubota and T. Klein and Lang, {B. W.} and R. Poling and Scott, {A. W.} and A. Smith and P. Zweber and S. Dobbs and Z. Metreveli and Seth, {K. K.} and A. Tomaradze and J. Ernst and Ecklund, {K. M.} and H. Severini and W. Love and V. Savinov and O. Aquines and Z. Li and A. Lopez and S. Mehrabyan and H. Mendez and J. Ramirez and Huang, {G. S.} and Miller, {D. H.} and V. Pavlunin and B. Sanghi and Shipsey, {I. P J} and B. Xin and Adams, {G. S.} and M. Anderson and Cummings, {J. P.} and I. Danko and D. Hu and B. Moziak and J. Napolitano and Q. He and J. Insler and H. Muramatsu and Park, {C. S.} and Thorndike, {E. H.} and F. Yang and Coan, {T. E.} and Gao, {Y. S.} and M. Artuso and S. Blusk and J. Butt and J. Li and N. Menaa and Moneti, {G. C.} and R. Mountain and S. Nisar and K. Randrianarivony and R. Sia and T. Skwarnicki and S. Stone and Wang, {J. C.} and K. Zhang and G. Bonvicini and D. Cinabro and M. Dubrovin and A. Lincoln and Asner, {D. M.} and Edwards, {K. W.}",

note = "Funding Information: W. Cai appreciates the assistance from Keonwook Kang and Seunghwa Ryu in constructing the case studies and acknowledges support by NSF grant CMS-0547681, AFOSR grant FA9550-07-1-0464, and the Army High Performance Computing Research Center at Stanford. J. Li acknowledges support by NSF grant CMMI-0728069 and DMR-1008104, MRSEC grant DMR-0520020, and AFOSR grant FA9550-08-1-0325. ",

year = "2007",

month = jul,

day = "27",

doi = "10.1103/PhysRevD.76.012005",

language = "English (US)",

volume = "76",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "1550-7998",

number = "1",

}

TY - JOUR

T1 - Comparison of particle production in quark and gluon fragmentation at s∼10GeV

AU - Briere, R. A.

AU - Ferguson, T.

AU - Tatishvili, G.

AU - Vogel, H.

AU - Watkins, M. E.

AU - Rosner, J. L.

AU - Adam, N. E.

AU - Alexander, J. P.

AU - Cassel, D. G.

AU - Duboscq, J. E.

AU - Ehrlich, R.

AU - Fields, L.

AU - Galik, R. S.

AU - Gibbons, L.

AU - Gray, R.

AU - Gray, S. W.

AU - Hartill, D. L.

AU - Heltsley, B. K.

AU - Hertz, D.

AU - Jones, C. D.

AU - Kandaswamy, J.

AU - Kreinick, D. L.

AU - Kuznetsov, V. E.

AU - Mahlke-Krüger, H.

AU - Onyisi, P. U E

AU - Patterson, J. R.

AU - Peterson, D.

AU - Pivarski, J.

AU - Riley, D.

AU - Ryd, A.

AU - Sadoff, A. J.

AU - Schwarthoff, H.

AU - Shi, X.

AU - Stroiney, S.

AU - Sun, W. M.

AU - Wilksen, T.

AU - Weinberger, M.

AU - Athar, S. B.

AU - Patel, R.

AU - Potlia, V.

AU - Yelton, J.

AU - Rubin, P.

AU - Cawlfield, C.

AU - Eisenstein, B. I.

AU - Karliner, I.

AU - Kim, D.

AU - Lowrey, N.

AU - Naik, P.

AU - Selen, M.

AU - White, E. J.

AU - Wiss, J.

AU - Mitchell, R. E.

AU - Shepherd, M. R.

AU - Besson, D.

AU - Swift, H. K.

AU - Pedlar, T. K.

AU - Cronin-Hennessy, D.

AU - Gao, K. Y.

AU - Hietala, J.

AU - Kubota, Y.

AU - Klein, T.

AU - Lang, B. W.

AU - Poling, R.

AU - Scott, A. W.

AU - Smith, A.

AU - Zweber, P.

AU - Dobbs, S.

AU - Metreveli, Z.

AU - Seth, K. K.

AU - Tomaradze, A.

AU - Ernst, J.

AU - Ecklund, K. M.

AU - Severini, H.

AU - Love, W.

AU - Savinov, V.

AU - Aquines, O.

AU - Li, Z.

AU - Lopez, A.

AU - Mehrabyan, S.

AU - Mendez, H.

AU - Ramirez, J.

AU - Huang, G. S.

AU - Miller, D. H.

AU - Pavlunin, V.

AU - Sanghi, B.

AU - Shipsey, I. P J

AU - Xin, B.

AU - Adams, G. S.

AU - Anderson, M.

AU - Cummings, J. P.

AU - Danko, I.

AU - Hu, D.

AU - Moziak, B.

AU - Napolitano, J.

AU - He, Q.

AU - Insler, J.

AU - Muramatsu, H.

AU - Park, C. S.

AU - Thorndike, E. H.

AU - Yang, F.

AU - Coan, T. E.

AU - Gao, Y. S.

AU - Artuso, M.

AU - Blusk, S.

AU - Butt, J.

AU - Li, J.

AU - Menaa, N.

AU - Moneti, G. C.

AU - Mountain, R.

AU - Nisar, S.

AU - Randrianarivony, K.

AU - Sia, R.

AU - Skwarnicki, T.

AU - Stone, S.

AU - Wang, J. C.

AU - Zhang, K.

AU - Bonvicini, G.

AU - Cinabro, D.

AU - Dubrovin, M.

AU - Lincoln, A.

AU - Asner, D. M.

AU - Edwards, K. W.

N1 - Funding Information: W. Cai appreciates the assistance from Keonwook Kang and Seunghwa Ryu in constructing the case studies and acknowledges support by NSF grant CMS-0547681, AFOSR grant FA9550-07-1-0464, and the Army High Performance Computing Research Center at Stanford. J. Li acknowledges support by NSF grant CMMI-0728069 and DMR-1008104, MRSEC grant DMR-0520020, and AFOSR grant FA9550-08-1-0325.

PY - 2007/7/27

Y1 - 2007/7/27

N2 - Using e+e-→hadrons data collected with the CLEO-III detector at the Cornell Electron Storage Ring, we study the inclusive production of baryons/antibaryons (p,Λ) and mesons ( and f2(1270)) in gluon-fragmentation and quark-fragmentation processes. We first corroborate previous per-event total particle yields in Υ(1S)→ggg compared with nearby continuum (e+e-→qq̄) indicating greater (∼×2) per-event yields of baryons in 3-gluon fragmentation. We find similar results when we extend that comparison to include the Υ(2S) and Υ(3S) resonances. With higher statistics, we now also probe the momentum dependence of these per-event particle yields. Next, we compare particle production in the photon-tagged process Υ(1S)→ggγ with that in e+e-→qq̄γ events, to allow comparison of two-parton with three-parton particle-specific fragmentation. For each particle, we determine the "enhancement" ratio, defined as the ratio of particle yields per gluon-fragmentation event compared to quark-fragmentation event. Thus defined, an enhancement of 1.0 implies equal per-event production in gluon and quark fragmentation. In the photon-tagged analysis (Υ(1S)→ggγ compared to e+e-→qq̄γ), we find almost no enhancement for protons (∼1.2±0.1), but a significant enhancement (∼1.9±0.3) for Λ's. This small measured proton enhancement rate is supported by a study of baryon production in χb2→gg→p+X relative to χb1→qq̄g→p+X. Overall, per-event baryon production in radiative two-gluon fragmentation is somewhat smaller than that observed in three-gluon decays of the Υ(1S). Our results for baryon production are inconsistent with the predictions of the JETSET (7.3) fragmentation model.

AB - Using e+e-→hadrons data collected with the CLEO-III detector at the Cornell Electron Storage Ring, we study the inclusive production of baryons/antibaryons (p,Λ) and mesons ( and f2(1270)) in gluon-fragmentation and quark-fragmentation processes. We first corroborate previous per-event total particle yields in Υ(1S)→ggg compared with nearby continuum (e+e-→qq̄) indicating greater (∼×2) per-event yields of baryons in 3-gluon fragmentation. We find similar results when we extend that comparison to include the Υ(2S) and Υ(3S) resonances. With higher statistics, we now also probe the momentum dependence of these per-event particle yields. Next, we compare particle production in the photon-tagged process Υ(1S)→ggγ with that in e+e-→qq̄γ events, to allow comparison of two-parton with three-parton particle-specific fragmentation. For each particle, we determine the "enhancement" ratio, defined as the ratio of particle yields per gluon-fragmentation event compared to quark-fragmentation event. Thus defined, an enhancement of 1.0 implies equal per-event production in gluon and quark fragmentation. In the photon-tagged analysis (Υ(1S)→ggγ compared to e+e-→qq̄γ), we find almost no enhancement for protons (∼1.2±0.1), but a significant enhancement (∼1.9±0.3) for Λ's. This small measured proton enhancement rate is supported by a study of baryon production in χb2→gg→p+X relative to χb1→qq̄g→p+X. Overall, per-event baryon production in radiative two-gluon fragmentation is somewhat smaller than that observed in three-gluon decays of the Υ(1S). Our results for baryon production are inconsistent with the predictions of the JETSET (7.3) fragmentation model.

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UR - http://www.scopus.com/inward/citedby.url?scp=34547433231&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.76.012005

DO - 10.1103/PhysRevD.76.012005

M3 - Article

AN - SCOPUS:34547433231

SN - 1550-7998

VL - 76

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 1

M1 - 012005

ER -

Comparison of particle production in quark and gluon fragmentation at s∼10GeV

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