Flavor asymmetry of the light quark sea from semi-inclusive deep-inelastic scattering

K. Ackerstaff; A. Airapetian; N. Akopov; I. Akushevich; M. Amarian; E.C. Ashenauer; H. Avakian; R. Avakian; A. Avetissian; B. Bains; C. Baumgarten; M. Beckmann; S. Belostotski; J.E. Belz; T. Benisch; S. Bernreuther; N. Bianchi; J. Blouw; H. Bottcher; A. Borissov; J. Brack; S. Brauksiepe; B. Braun; B. Bray; S. Brons; W. Bruckner; A. Brull; E.E.W. Bruins; K.J. Bulten; R.V. Cadman; G.P. Capitani; P. Carter; P. Chumney; E. Cisbani; G.R. Court; P.F. Dalpiaz; E. De Sanctis; D. De Schepper; E. Devitsin; P.K.A.D. Huberts; P. Di Nezza; M. Duren; A. Dvoredsky; G. Elbakian; A. Fantoni; A. Fechtchenko; M. Ferstl; K. Fiedler; B.W. Filippone; H. Fischer; J.F.J. van den Brand

doi:10.1103/PhysRevLett.81.5519

Flavor asymmetry of the light quark sea from semi-inclusive deep-inelastic scattering

K. Ackerstaff^*, A. Airapetian, N. Akopov, I. Akushevich, M. Amarian, E.C. Ashenauer, H. Avakian, R. Avakian, A. Avetissian, B. Bains, C. Baumgarten, M. Beckmann, S. Belostotski, J.E. Belz, T. Benisch, S. Bernreuther, N. Bianchi, J. Blouw, H. Bottcher, A. BorissovJ. Brack, S. Brauksiepe, B. Braun, B. Bray, S. Brons, W. Bruckner, A. Brull, E.E.W. Bruins, K.J. Bulten, R.V. Cadman, G.P. Capitani, P. Carter, P. Chumney, E. Cisbani, G.R. Court, P.F. Dalpiaz, E. De Sanctis, D. De Schepper, E. Devitsin, P.K.A.D. Huberts, P. Di Nezza, M. Duren, A. Dvoredsky, G. Elbakian, A. Fantoni, A. Fechtchenko, M. Ferstl, K. Fiedler, B.W. Filippone, H. Fischer, J.F.J. van den Brand

^*Corresponding author for this work

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

Abstract

The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02 < x < 0.3 and 1 < Q(2) < 10 GeV2 for the first time from semi-inclusive deep-inelastic scattering. The quantity [(d) over bar(x) - (u) over bar(x)]/[u(x) - d(x)] is derived from a relationship between the yields of positive and negative pions from unpolarized hydrogen and deuterium targets. The flavor asymmetry (d) over bar - (u) over bar is found to be nonzero and x dependent, showing an excess of (d) over bar over (u) over bar quarks in the proton.

Original language	English
Pages (from-to)	5519-5523
Number of pages	5
Journal	Physical Review Letters
Volume	81
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.81.5519
Publication status	Published - 21 Dec 1998
Externally published	Yes

Keywords

DRELL-YAN PROCESS
PARTON DISTRIBUTIONS
BREAKING
NUCLEON
PROTON

Access to Document

10.1103/PhysRevLett.81.5519

Cite this

Ackerstaff, K., Airapetian, A., Akopov, N., Akushevich, I., Amarian, M., Ashenauer, E. C., Avakian, H., Avakian, R., Avetissian, A., Bains, B., Baumgarten, C., Beckmann, M., Belostotski, S., Belz, J. E., Benisch, T., Bernreuther, S., Bianchi, N., Blouw, J., Bottcher, H., ... van den Brand, J. F. J. (1998). Flavor asymmetry of the light quark sea from semi-inclusive deep-inelastic scattering. Physical Review Letters, 81(25), 5519-5523. https://doi.org/10.1103/PhysRevLett.81.5519

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title = "Flavor asymmetry of the light quark sea from semi-inclusive deep-inelastic scattering",

abstract = "The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02 < x < 0.3 and 1 < Q(2) < 10 GeV2 for the first time from semi-inclusive deep-inelastic scattering. The quantity [(d) over bar(x) - (u) over bar(x)]/[u(x) - d(x)] is derived from a relationship between the yields of positive and negative pions from unpolarized hydrogen and deuterium targets. The flavor asymmetry (d) over bar - (u) over bar is found to be nonzero and x dependent, showing an excess of (d) over bar over (u) over bar quarks in the proton.",

keywords = "DRELL-YAN PROCESS, PARTON DISTRIBUTIONS, BREAKING, NUCLEON, PROTON",

author = "K. Ackerstaff and A. Airapetian and N. Akopov and I. Akushevich and M. Amarian and E.C. Ashenauer and H. Avakian and R. Avakian and A. Avetissian and B. Bains and C. Baumgarten and M. Beckmann and S. Belostotski and J.E. Belz and T. Benisch and S. Bernreuther and N. Bianchi and J. Blouw and H. Bottcher and A. Borissov and J. Brack and S. Brauksiepe and B. Braun and B. Bray and S. Brons and W. Bruckner and A. Brull and E.E.W. Bruins and K.J. Bulten and R.V. Cadman and G.P. Capitani and P. Carter and P. Chumney and E. Cisbani and G.R. Court and P.F. Dalpiaz and {De Sanctis}, E. and {De Schepper}, D. and E. Devitsin and P.K.A.D. Huberts and {Di Nezza}, P. and M. Duren and A. Dvoredsky and G. Elbakian and A. Fantoni and A. Fechtchenko and M. Ferstl and K. Fiedler and B.W. Filippone and H. Fischer and {van den Brand}, J.F.J.",

year = "1998",

month = dec,

day = "21",

doi = "10.1103/PhysRevLett.81.5519",

language = "English",

volume = "81",

pages = "5519--5523",

journal = "Physical Review Letters",

issn = "0031-9007",

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Ackerstaff, K, Airapetian, A, Akopov, N, Akushevich, I, Amarian, M, Ashenauer, EC, Avakian, H, Avakian, R, Avetissian, A, Bains, B, Baumgarten, C, Beckmann, M, Belostotski, S, Belz, JE, Benisch, T, Bernreuther, S, Bianchi, N, Blouw, J, Bottcher, H, Borissov, A, Brack, J, Brauksiepe, S, Braun, B, Bray, B, Brons, S, Bruckner, W, Brull, A, Bruins, EEW, Bulten, KJ, Cadman, RV, Capitani, GP, Carter, P, Chumney, P, Cisbani, E, Court, GR, Dalpiaz, PF, De Sanctis, E, De Schepper, D, Devitsin, E, Huberts, PKAD, Di Nezza, P, Duren, M, Dvoredsky, A, Elbakian, G, Fantoni, A, Fechtchenko, A, Ferstl, M, Fiedler, K, Filippone, BW, Fischer, H & van den Brand, JFJ 1998, 'Flavor asymmetry of the light quark sea from semi-inclusive deep-inelastic scattering', Physical Review Letters, vol. 81, no. 25, pp. 5519-5523. https://doi.org/10.1103/PhysRevLett.81.5519

TY - JOUR

T1 - Flavor asymmetry of the light quark sea from semi-inclusive deep-inelastic scattering

AU - Ackerstaff, K.

AU - Airapetian, A.

AU - Akopov, N.

AU - Akushevich, I.

AU - Amarian, M.

AU - Ashenauer, E.C.

AU - Avakian, H.

AU - Avakian, R.

AU - Avetissian, A.

AU - Bains, B.

AU - Baumgarten, C.

AU - Beckmann, M.

AU - Belostotski, S.

AU - Belz, J.E.

AU - Benisch, T.

AU - Bernreuther, S.

AU - Bianchi, N.

AU - Blouw, J.

AU - Bottcher, H.

AU - Borissov, A.

AU - Brack, J.

AU - Brauksiepe, S.

AU - Braun, B.

AU - Bray, B.

AU - Brons, S.

AU - Bruckner, W.

AU - Brull, A.

AU - Bruins, E.E.W.

AU - Bulten, K.J.

AU - Cadman, R.V.

AU - Capitani, G.P.

AU - Carter, P.

AU - Chumney, P.

AU - Cisbani, E.

AU - Court, G.R.

AU - Dalpiaz, P.F.

AU - De Sanctis, E.

AU - De Schepper, D.

AU - Devitsin, E.

AU - Huberts, P.K.A.D.

AU - Di Nezza, P.

AU - Duren, M.

AU - Dvoredsky, A.

AU - Elbakian, G.

AU - Fantoni, A.

AU - Fechtchenko, A.

AU - Ferstl, M.

AU - Fiedler, K.

AU - Filippone, B.W.

AU - Fischer, H.

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

PY - 1998/12/21

Y1 - 1998/12/21

N2 - The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02 < x < 0.3 and 1 < Q(2) < 10 GeV2 for the first time from semi-inclusive deep-inelastic scattering. The quantity [(d) over bar(x) - (u) over bar(x)]/[u(x) - d(x)] is derived from a relationship between the yields of positive and negative pions from unpolarized hydrogen and deuterium targets. The flavor asymmetry (d) over bar - (u) over bar is found to be nonzero and x dependent, showing an excess of (d) over bar over (u) over bar quarks in the proton.

AB - The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02 < x < 0.3 and 1 < Q(2) < 10 GeV2 for the first time from semi-inclusive deep-inelastic scattering. The quantity [(d) over bar(x) - (u) over bar(x)]/[u(x) - d(x)] is derived from a relationship between the yields of positive and negative pions from unpolarized hydrogen and deuterium targets. The flavor asymmetry (d) over bar - (u) over bar is found to be nonzero and x dependent, showing an excess of (d) over bar over (u) over bar quarks in the proton.

KW - DRELL-YAN PROCESS

KW - PARTON DISTRIBUTIONS

KW - BREAKING

KW - NUCLEON

KW - PROTON

U2 - 10.1103/PhysRevLett.81.5519

DO - 10.1103/PhysRevLett.81.5519

M3 - Article

SN - 0031-9007

VL - 81

SP - 5519

EP - 5523

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

ER -