Multiplicity of charged and neutral pions in deep-inelastic scattering of 27.5 GeV positrons on hydrogen

A. Airapetian; N. Akopov; Z. Akopov; M. Amarian; J. Arrington; E. C. Aschenauer; H. Avakian; R. Avakian; A. Avetissian; E. Avetissian; P. Bailey; B. Bains; C. Baumgarten; M. Beckmann; S. Belostotski; S. Bernreuther; N. Bianchi; H. Böttcher; A. Borissov; M. Bouwhuis; J. Brack; S. Brauksiepe; B. Braun; W. Brückner; A. Brüll; P. Budz; H. J. Bulten; G. P. Capitani; P. Carter; P. Chumney; E. Cisbani; G. R. Court; P. F. Dalpiaz; R. de Leo; L. de Nardo; E. de Sanctis; D. de Schepper; E. Devitsin; P. K.A. de Witt Huberts; P. Di Nezza; V. Djordjadze; M. Düren; A. Dvoredsky; G. Elbakian; J. Ely; A. Fantoni; A. Fechtchenko; M. Ferro-Luzzi; K. Fiedler; B. W. Filippone; H. Fischer; B. Fox; J. Franz; S. Frullani; Y. Gärber; F. Garibaldi; E. Garutti; G. Gavrilov; V. Gharibyan; A. Golendukhin; G. Graw; O. Grebeniouk; P. W. Green; L. G. Greeniaus; A. Gute; W. Haeberli; M. Hartig; D. Hasch; D. Heesbeen; F. H. Heinsius; M. Henoch; R. Hertenberger; W. H.A. Hesselink; P. Hoffmann-Rothe; G. Hofman; Y. Holler; R. J. Holt; B. Hommez; W. Hoprich; G. Iarygin; H. Ihssen; M. Iodice; A. Izotov; H. E. Jackson; A. Jgoun; R. Kaiser; J. Kanesaka; E. Kinney; A. Kisselev; P. Kitching; H. Kobayashi; N. Koch; K. Königsmann; H. Kolster; V. Korotkov; E. Kotik; V. Kozlov; V. G. Krivokhijine; G. Kyle; L. Lagamba; A. Laziev; P. Lenisa; T. Lindemann; W. Lorenzon; N. C.R. Makins; J. W. Martin; H. Marukyan; F. Masoli; M. McAndrew; K. Mcllhany; R. D. McKeown; F. Meissner; F. Menden; A. Metz; N. Meyners; O. Mikloukho; C. A. Miller; R. Milner; V. Muccifora; R. Mussa; A. Nagaitsev; E. Nappi; Y. Naryshkin; A. Nass; W. D. Nowak; T. G. O'Neill; R. Openshaw; J. Ouyang; B. R. Owen; S. F. Pate; S. Potashov; D. H. Potterveld; G. Rakness; R. Redwine; D. Reggiani; A. R. Reolon; R. Ristinen; K. Rith; D. Robinson; A. Rostomyan; M. Ruh; D. Ryckbosch; Y. Sakemi; F. Sato; I. Savin; C. Scarlett; A. Schäfer; C. Schill; F. Schmidt; M. Schmitt; G. Schnell; K. P. Schäler; A. Schwind; J. Seibert; T. A. Shibata; T. Shin; V. Shutov; M. C. Simani; A. Simon; K. Sinram; E. Steffens; J. J.M. Steijger; J. Stewart; U. Stösslein; K. Suetsugu; M. Sutter; H. Tallini; S. Taroian; A. Terkulov; S. Tessarin; E. Thomas; B. Tipton; M. Tytgat; G. M. Urciuoli; J. F.J. van den Brand; G. van der Steenhoven; R. van de Vyver; J. J. van Hunen; M. C. Vetterli; V. Vikhrov; M. G. Vincter; J. Visser; E. Volk; C. Weiskopf; J. Wendland; J. Wilbert; T. Wise; K. Woller; S. Yoneyama; H. Zohrabian

doi:10.1007/s100520100765

Multiplicity of charged and neutral pions in deep-inelastic scattering of 27.5 GeV positrons on hydrogen

A. Airapetian, N. Akopov, Z. Akopov, M. Amarian, J. Arrington, E. C. Aschenauer, H. Avakian, R. Avakian, A. Avetissian, E. Avetissian, P. Bailey, B. Bains, C. Baumgarten, M. Beckmann, S. Belostotski, S. Bernreuther, N. Bianchi, H. Böttcher, A. Borissov, M. BouwhuisJ. Brack, S. Brauksiepe, B. Braun, W. Brückner, A. Brüll, P. Budz, H. J. Bulten, G. P. Capitani, P. Carter, P. Chumney, E. Cisbani, G. R. Court, P. F. Dalpiaz, R. de Leo, L. de Nardo, E. de Sanctis, D. de Schepper, E. Devitsin, P. K.A. de Witt Huberts, P. Di Nezza, V. Djordjadze, M. Düren, A. Dvoredsky, G. Elbakian, J. Ely, A. Fantoni, A. Fechtchenko, M. Ferro-Luzzi, K. Fiedler, B. W. Filippone, H. Fischer, B. Fox, J. Franz, S. Frullani, Y. Gärber, F. Garibaldi, E. Garutti, G. Gavrilov, V. Gharibyan, A. Golendukhin, G. Graw, O. Grebeniouk, P. W. Green, L. G. Greeniaus, A. Gute, W. Haeberli, M. Hartig, D. Hasch, D. Heesbeen, F. H. Heinsius, M. Henoch, R. Hertenberger, W. H.A. Hesselink, P. Hoffmann-Rothe, G. Hofman, Y. Holler, R. J. Holt, B. Hommez, W. Hoprich, G. Iarygin, H. Ihssen, M. Iodice, A. Izotov, H. E. Jackson, A. Jgoun, R. Kaiser, J. Kanesaka, E. Kinney, A. Kisselev, P. Kitching, H. Kobayashi, N. Koch, K. Königsmann, H. Kolster, V. Korotkov, E. Kotik, V. Kozlov, V. G. Krivokhijine, G. Kyle, L. Lagamba, A. Laziev, P. Lenisa, T. Lindemann, W. Lorenzon, N. C.R. Makins, J. W. Martin, H. Marukyan, F. Masoli, M. McAndrew, K. Mcllhany, R. D. McKeown, F. Meissner, F. Menden, A. Metz, N. Meyners, O. Mikloukho, C. A. Miller, R. Milner, V. Muccifora, R. Mussa, A. Nagaitsev, E. Nappi, Y. Naryshkin, A. Nass, W. D. Nowak, T. G. O'Neill, R. Openshaw, J. Ouyang, B. R. Owen, S. F. Pate, S. Potashov, D. H. Potterveld, G. Rakness, R. Redwine, D. Reggiani, A. R. Reolon, R. Ristinen, K. Rith, D. Robinson, A. Rostomyan, M. Ruh, D. Ryckbosch, Y. Sakemi, F. Sato, I. Savin, C. Scarlett, A. Schäfer, C. Schill, F. Schmidt, M. Schmitt, G. Schnell, K. P. Schäler, A. Schwind, J. Seibert, T. A. Shibata, T. Shin, V. Shutov, M. C. Simani, A. Simon, K. Sinram, E. Steffens, J. J.M. Steijger, J. Stewart, U. Stösslein, K. Suetsugu, M. Sutter, H. Tallini, S. Taroian, A. Terkulov, S. Tessarin, E. Thomas, B. Tipton, M. Tytgat, G. M. Urciuoli, J. F.J. van den Brand, G. van der Steenhoven, R. van de Vyver, J. J. van Hunen, M. C. Vetterli, V. Vikhrov, M. G. Vincter, J. Visser, E. Volk, C. Weiskopf, J. Wendland, J. Wilbert, T. Wise, K. Woller, S. Yoneyama, H. Zohrabian

Physics

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

Abstract

Measurements of the individual multiplicities of π⁺, π^- and π⁰ produced in the deep-inelastic scattering of 27.5 GeV positrons on hydrogen are presented. The average charged pion multiplicity is the same as for neutral pions, up to z ≈ 0.7, where z is the fraction of the energy transferred in the scattering process carried by the pion. This result (below z ≈ 0.7) is consistent with isospin invariance. The total energy fraction associated with charged and neutral pions is 0.51 ± 0.01(stat.) ± 0.08(syst.) and 0.26 ± 0.01(stat.) ± 0.04(syst.), respectively. For fixed z, the measured multiplicities depend on both the negative squared four momentum transfer Q² and the Bjorken variable χ. The observed dependence on Q² agrees qualitatively with the expected behaviour based on NLO-QCD evolution, while the dependence on χ is consistent with that of previous data after corrections have been made for the expected Q²-dependence.

Original language	English (US)
Pages (from-to)	599-606
Number of pages	8
Journal	European Physical Journal C
Volume	21
Issue number	4
DOIs	https://doi.org/10.1007/s100520100765
State	Published - Jul 2001

ASJC Scopus subject areas

Engineering (miscellaneous)
Physics and Astronomy (miscellaneous)

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Airapetian, A., Akopov, N., Akopov, Z., Amarian, M., Arrington, J., Aschenauer, E. C., Avakian, H., Avakian, R., Avetissian, A., Avetissian, E., Bailey, P., Bains, B., Baumgarten, C., Beckmann, M., Belostotski, S., Bernreuther, S., Bianchi, N., Böttcher, H., Borissov, A., ... Zohrabian, H. (2001). Multiplicity of charged and neutral pions in deep-inelastic scattering of 27.5 GeV positrons on hydrogen. European Physical Journal C, 21(4), 599-606. https://doi.org/10.1007/s100520100765

Airapetian, A, Akopov, N, Akopov, Z, Amarian, M, Arrington, J, Aschenauer, EC, Avakian, H, Avakian, R, Avetissian, A, Avetissian, E, Bailey, P, Bains, B, Baumgarten, C, Beckmann, M, Belostotski, S, Bernreuther, S, Bianchi, N, Böttcher, H, Borissov, A, Bouwhuis, M, Brack, J, Brauksiepe, S, Braun, B, Brückner, W, Brüll, A, Budz, P, Bulten, HJ, Capitani, GP, Carter, P, Chumney, P, Cisbani, E, Court, GR, Dalpiaz, PF, de Leo, R, de Nardo, L, de Sanctis, E, de Schepper, D, Devitsin, E, de Witt Huberts, PKA, Di Nezza, P, Djordjadze, V, Düren, M, Dvoredsky, A, Elbakian, G, Ely, J, Fantoni, A, Fechtchenko, A, Ferro-Luzzi, M, Fiedler, K, Filippone, BW, Fischer, H, Fox, B, Franz, J, Frullani, S, Gärber, Y, Garibaldi, F, Garutti, E, Gavrilov, G, Gharibyan, V, Golendukhin, A, Graw, G, Grebeniouk, O, Green, PW, Greeniaus, LG, Gute, A, Haeberli, W, Hartig, M, Hasch, D, Heesbeen, D, Heinsius, FH, Henoch, M, Hertenberger, R, Hesselink, WHA, Hoffmann-Rothe, P, Hofman, G, Holler, Y, Holt, RJ, Hommez, B, Hoprich, W, Iarygin, G, Ihssen, H, Iodice, M, Izotov, A, Jackson, HE, Jgoun, A, Kaiser, R, Kanesaka, J, Kinney, E, Kisselev, A, Kitching, P, Kobayashi, H, Koch, N, Königsmann, K, Kolster, H, Korotkov, V, Kotik, E, Kozlov, V, Krivokhijine, VG, Kyle, G, Lagamba, L, Laziev, A, Lenisa, P, Lindemann, T, Lorenzon, W, Makins, NCR, Martin, JW, Marukyan, H, Masoli, F, McAndrew, M, Mcllhany, K, McKeown, RD, Meissner, F, Menden, F, Metz, A, Meyners, N, Mikloukho, O, Miller, CA, Milner, R, Muccifora, V, Mussa, R, Nagaitsev, A, Nappi, E, Naryshkin, Y, Nass, A, Nowak, WD, O'Neill, TG, Openshaw, R, Ouyang, J, Owen, BR, Pate, SF, Potashov, S, Potterveld, DH, Rakness, G, Redwine, R, Reggiani, D, Reolon, AR, Ristinen, R, Rith, K, Robinson, D, Rostomyan, A, Ruh, M, Ryckbosch, D, Sakemi, Y, Sato, F, Savin, I, Scarlett, C, Schäfer, A, Schill, C, Schmidt, F, Schmitt, M, Schnell, G, Schäler, KP, Schwind, A, Seibert, J, Shibata, TA, Shin, T, Shutov, V, Simani, MC, Simon, A, Sinram, K, Steffens, E, Steijger, JJM, Stewart, J, Stösslein, U, Suetsugu, K, Sutter, M, Tallini, H, Taroian, S, Terkulov, A, Tessarin, S, Thomas, E, Tipton, B, Tytgat, M, Urciuoli, GM, van den Brand, JFJ, van der Steenhoven, G, van de Vyver, R, van Hunen, JJ, Vetterli, MC, Vikhrov, V, Vincter, MG, Visser, J, Volk, E, Weiskopf, C, Wendland, J, Wilbert, J, Wise, T, Woller, K, Yoneyama, S & Zohrabian, H 2001, 'Multiplicity of charged and neutral pions in deep-inelastic scattering of 27.5 GeV positrons on hydrogen', European Physical Journal C, vol. 21, no. 4, pp. 599-606. https://doi.org/10.1007/s100520100765

@article{ec8d77390f604a33aef0a335ab6c20da,

title = "Multiplicity of charged and neutral pions in deep-inelastic scattering of 27.5 GeV positrons on hydrogen",

abstract = "Measurements of the individual multiplicities of π+, π- and π0 produced in the deep-inelastic scattering of 27.5 GeV positrons on hydrogen are presented. The average charged pion multiplicity is the same as for neutral pions, up to z ≈ 0.7, where z is the fraction of the energy transferred in the scattering process carried by the pion. This result (below z ≈ 0.7) is consistent with isospin invariance. The total energy fraction associated with charged and neutral pions is 0.51 ± 0.01(stat.) ± 0.08(syst.) and 0.26 ± 0.01(stat.) ± 0.04(syst.), respectively. For fixed z, the measured multiplicities depend on both the negative squared four momentum transfer Q2 and the Bjorken variable χ. The observed dependence on Q2 agrees qualitatively with the expected behaviour based on NLO-QCD evolution, while the dependence on χ is consistent with that of previous data after corrections have been made for the expected Q2-dependence.",

author = "A. Airapetian and N. Akopov and Z. Akopov and M. Amarian and J. Arrington and Aschenauer, {E. C.} and H. Avakian and R. Avakian and A. Avetissian and E. Avetissian and P. Bailey and B. Bains and C. Baumgarten and M. Beckmann and S. Belostotski and S. Bernreuther and N. Bianchi and H. B{\"o}ttcher and A. Borissov and M. Bouwhuis and J. Brack and S. Brauksiepe and B. Braun and W. Br{\"u}ckner and A. Br{\"u}ll and P. Budz and Bulten, {H. J.} and Capitani, {G. P.} and P. Carter and P. Chumney and E. Cisbani and Court, {G. R.} and Dalpiaz, {P. F.} and {de Leo}, R. and {de Nardo}, L. and {de Sanctis}, E. and {de Schepper}, D. and E. Devitsin and {de Witt Huberts}, {P. K.A.} and {Di Nezza}, P. and V. Djordjadze and M. D{\"u}ren and A. Dvoredsky and G. Elbakian and J. Ely and A. Fantoni and A. Fechtchenko and M. Ferro-Luzzi and K. Fiedler and Filippone, {B. W.} and H. Fischer and B. Fox and J. Franz and S. Frullani and Y. G{\"a}rber and F. Garibaldi and E. Garutti and G. Gavrilov and V. Gharibyan and A. Golendukhin and G. Graw and O. Grebeniouk and Green, {P. W.} and Greeniaus, {L. G.} and A. Gute and W. Haeberli and M. Hartig and D. Hasch and D. Heesbeen and Heinsius, {F. H.} and M. Henoch and R. Hertenberger and Hesselink, {W. H.A.} and P. Hoffmann-Rothe and G. Hofman and Y. Holler and Holt, {R. J.} and B. Hommez and W. Hoprich and G. Iarygin and H. Ihssen and M. Iodice and A. Izotov and Jackson, {H. E.} and A. Jgoun and R. Kaiser and J. Kanesaka and E. Kinney and A. Kisselev and P. Kitching and H. Kobayashi and N. Koch and K. K{\"o}nigsmann and H. Kolster and V. Korotkov and E. Kotik and V. Kozlov and Krivokhijine, {V. G.} and G. Kyle and L. Lagamba and A. Laziev and P. Lenisa and T. Lindemann and W. Lorenzon and Makins, {N. C.R.} and Martin, {J. W.} and H. Marukyan and F. Masoli and M. McAndrew and K. Mcllhany and McKeown, {R. D.} and F. Meissner and F. Menden and A. Metz and N. Meyners and O. Mikloukho and Miller, {C. A.} and R. Milner and V. Muccifora and R. Mussa and A. Nagaitsev and E. Nappi and Y. Naryshkin and A. Nass and Nowak, {W. D.} and O'Neill, {T. G.} and R. Openshaw and J. Ouyang and Owen, {B. R.} and Pate, {S. F.} and S. Potashov and Potterveld, {D. H.} and G. Rakness and R. Redwine and D. Reggiani and Reolon, {A. R.} and R. Ristinen and K. Rith and D. Robinson and A. Rostomyan and M. Ruh and D. Ryckbosch and Y. Sakemi and F. Sato and I. Savin and C. Scarlett and A. Sch{\"a}fer and C. Schill and F. Schmidt and M. Schmitt and G. Schnell and Sch{\"a}ler, {K. P.} and A. Schwind and J. Seibert and Shibata, {T. A.} and T. Shin and V. Shutov and Simani, {M. C.} and A. Simon and K. Sinram and E. Steffens and Steijger, {J. J.M.} and J. Stewart and U. St{\"o}sslein and K. Suetsugu and M. Sutter and H. Tallini and S. Taroian and A. Terkulov and S. Tessarin and E. Thomas and B. Tipton and M. Tytgat and Urciuoli, {G. M.} and {van den Brand}, {J. F.J.} and {van der Steenhoven}, G. and {van de Vyver}, R. and {van Hunen}, {J. J.} and Vetterli, {M. C.} and V. Vikhrov and Vincter, {M. G.} and J. Visser and E. Volk and C. Weiskopf and J. Wendland and J. Wilbert and T. Wise and K. Woller and S. Yoneyama and H. Zohrabian",

year = "2001",

month = jul,

doi = "10.1007/s100520100765",

language = "English (US)",

volume = "21",

pages = "599--606",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer",

number = "4",

}

TY - JOUR

T1 - Multiplicity of charged and neutral pions in deep-inelastic scattering of 27.5 GeV positrons on hydrogen

AU - Airapetian, A.

AU - Akopov, N.

AU - Akopov, Z.

AU - Amarian, M.

AU - Arrington, J.

AU - Aschenauer, E. C.

AU - Avakian, H.

AU - Avakian, R.

AU - Avetissian, A.

AU - Avetissian, E.

AU - Bailey, P.

AU - Bains, B.

AU - Baumgarten, C.

AU - Beckmann, M.

AU - Belostotski, S.

AU - Bernreuther, S.

AU - Bianchi, N.

AU - Böttcher, H.

AU - Borissov, A.

AU - Bouwhuis, M.

AU - Brack, J.

AU - Brauksiepe, S.

AU - Braun, B.

AU - Brückner, W.

AU - Brüll, A.

AU - Budz, P.

AU - Bulten, H. J.

AU - Capitani, G. P.

AU - Carter, P.

AU - Chumney, P.

AU - Cisbani, E.

AU - Court, G. R.

AU - Dalpiaz, P. F.

AU - de Leo, R.

AU - de Nardo, L.

AU - de Sanctis, E.

AU - de Schepper, D.

AU - Devitsin, E.

AU - de Witt Huberts, P. K.A.

AU - Di Nezza, P.

AU - Djordjadze, V.

AU - Düren, M.

AU - Dvoredsky, A.

AU - Elbakian, G.

AU - Ely, J.

AU - Fantoni, A.

AU - Fechtchenko, A.

AU - Ferro-Luzzi, M.

AU - Fiedler, K.

AU - Filippone, B. W.

AU - Fischer, H.

AU - Fox, B.

AU - Franz, J.

AU - Frullani, S.

AU - Gärber, Y.

AU - Garibaldi, F.

AU - Garutti, E.

AU - Gavrilov, G.

AU - Gharibyan, V.

AU - Golendukhin, A.

AU - Graw, G.

AU - Grebeniouk, O.

AU - Green, P. W.

AU - Greeniaus, L. G.

AU - Gute, A.

AU - Haeberli, W.

AU - Hartig, M.

AU - Hasch, D.

AU - Heesbeen, D.

AU - Heinsius, F. H.

AU - Henoch, M.

AU - Hertenberger, R.

AU - Hesselink, W. H.A.

AU - Hoffmann-Rothe, P.

AU - Hofman, G.

AU - Holler, Y.

AU - Holt, R. J.

AU - Hommez, B.

AU - Hoprich, W.

AU - Iarygin, G.

AU - Ihssen, H.

AU - Iodice, M.

AU - Izotov, A.

AU - Jackson, H. E.

AU - Jgoun, A.

AU - Kaiser, R.

AU - Kanesaka, J.

AU - Kinney, E.

AU - Kisselev, A.

AU - Kitching, P.

AU - Kobayashi, H.

AU - Koch, N.

AU - Königsmann, K.

AU - Kolster, H.

AU - Korotkov, V.

AU - Kotik, E.

AU - Kozlov, V.

AU - Krivokhijine, V. G.

AU - Kyle, G.

AU - Lagamba, L.

AU - Laziev, A.

AU - Lenisa, P.

AU - Lindemann, T.

AU - Lorenzon, W.

AU - Makins, N. C.R.

AU - Martin, J. W.

AU - Marukyan, H.

AU - Masoli, F.

AU - McAndrew, M.

AU - Mcllhany, K.

AU - McKeown, R. D.

AU - Meissner, F.

AU - Menden, F.

AU - Metz, A.

AU - Meyners, N.

AU - Mikloukho, O.

AU - Miller, C. A.

AU - Milner, R.

AU - Muccifora, V.

AU - Mussa, R.

AU - Nagaitsev, A.

AU - Nappi, E.

AU - Naryshkin, Y.

AU - Nass, A.

AU - Nowak, W. D.

AU - O'Neill, T. G.

AU - Openshaw, R.

AU - Ouyang, J.

AU - Owen, B. R.

AU - Pate, S. F.

AU - Potashov, S.

AU - Potterveld, D. H.

AU - Rakness, G.

AU - Redwine, R.

AU - Reggiani, D.

AU - Reolon, A. R.

AU - Ristinen, R.

AU - Rith, K.

AU - Robinson, D.

AU - Rostomyan, A.

AU - Ruh, M.

AU - Ryckbosch, D.

AU - Sakemi, Y.

AU - Sato, F.

AU - Savin, I.

AU - Scarlett, C.

AU - Schäfer, A.

AU - Schill, C.

AU - Schmidt, F.

AU - Schmitt, M.

AU - Schnell, G.

AU - Schäler, K. P.

AU - Schwind, A.

AU - Seibert, J.

AU - Shibata, T. A.

AU - Shin, T.

AU - Shutov, V.

AU - Simani, M. C.

AU - Simon, A.

AU - Sinram, K.

AU - Steffens, E.

AU - Steijger, J. J.M.

AU - Stewart, J.

AU - Stösslein, U.

AU - Suetsugu, K.

AU - Sutter, M.

AU - Tallini, H.

AU - Taroian, S.

AU - Terkulov, A.

AU - Tessarin, S.

AU - Thomas, E.

AU - Tipton, B.

AU - Tytgat, M.

AU - Urciuoli, G. M.

AU - van den Brand, J. F.J.

AU - van der Steenhoven, G.

AU - van de Vyver, R.

AU - van Hunen, J. J.

AU - Vetterli, M. C.

AU - Vikhrov, V.

AU - Vincter, M. G.

AU - Visser, J.

AU - Volk, E.

AU - Weiskopf, C.

AU - Wendland, J.

AU - Wilbert, J.

AU - Wise, T.

AU - Woller, K.

AU - Yoneyama, S.

AU - Zohrabian, H.

PY - 2001/7

Y1 - 2001/7

N2 - Measurements of the individual multiplicities of π+, π- and π0 produced in the deep-inelastic scattering of 27.5 GeV positrons on hydrogen are presented. The average charged pion multiplicity is the same as for neutral pions, up to z ≈ 0.7, where z is the fraction of the energy transferred in the scattering process carried by the pion. This result (below z ≈ 0.7) is consistent with isospin invariance. The total energy fraction associated with charged and neutral pions is 0.51 ± 0.01(stat.) ± 0.08(syst.) and 0.26 ± 0.01(stat.) ± 0.04(syst.), respectively. For fixed z, the measured multiplicities depend on both the negative squared four momentum transfer Q2 and the Bjorken variable χ. The observed dependence on Q2 agrees qualitatively with the expected behaviour based on NLO-QCD evolution, while the dependence on χ is consistent with that of previous data after corrections have been made for the expected Q2-dependence.

AB - Measurements of the individual multiplicities of π+, π- and π0 produced in the deep-inelastic scattering of 27.5 GeV positrons on hydrogen are presented. The average charged pion multiplicity is the same as for neutral pions, up to z ≈ 0.7, where z is the fraction of the energy transferred in the scattering process carried by the pion. This result (below z ≈ 0.7) is consistent with isospin invariance. The total energy fraction associated with charged and neutral pions is 0.51 ± 0.01(stat.) ± 0.08(syst.) and 0.26 ± 0.01(stat.) ± 0.04(syst.), respectively. For fixed z, the measured multiplicities depend on both the negative squared four momentum transfer Q2 and the Bjorken variable χ. The observed dependence on Q2 agrees qualitatively with the expected behaviour based on NLO-QCD evolution, while the dependence on χ is consistent with that of previous data after corrections have been made for the expected Q2-dependence.

UR - http://www.scopus.com/inward/record.url?scp=0001277982&partnerID=8YFLogxK

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U2 - 10.1007/s100520100765

DO - 10.1007/s100520100765

M3 - Article

AN - SCOPUS:0001277982

SN - 1434-6044

VL - 21

SP - 599

EP - 606

JO - European Physical Journal C

JF - European Physical Journal C

IS - 4

ER -

Multiplicity of charged and neutral pions in deep-inelastic scattering of 27.5 GeV positrons on hydrogen

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