Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

(CLAS Collaboration)

doi:10.1103/PhysRevLett.126.062002

Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

(CLAS Collaboration)

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

Abstract

A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function e(x). Data have been collected in the Hall-B at Jefferson Lab by impinging a 5.498-GeV electron beam on a liquid-hydrogen target, and reconstructing the scattered electron and the pion pair with the CLAS detector. One-dimensional projections of the ALUsinφR moments are extracted for the kinematic variables of interest in the valence quark region. The understanding of dihadron production is essential for the interpretation of observables in single-hadron production in semi-inclusive DIS, and pioneering measurements of single-spin asymmetries in dihadron production open a new avenue in studies of QCD dynamics.

Original language	English
Article number	062002
Number of pages	6
Journal	Physical Review Letters
Volume	126
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.126.062002
Publication status	Published - 12 Feb 2021

Bibliographical note

Funding Information:
We thank the staff of the Accelerator and Physics Divisions for making the experiment possible. Special thanks to A. Bacchetta, B. Pasquini, M. Polyakov, M. Radici, P. Schweitzer, and M. Wakamatsu for useful discussions. This work was supported in part by the U.S. Department of Energy (No. DE-FG02-96ER40950) and National Science Foundation, the French Centre National de la Recherche Scientifique and Commissariat à l’Energie Atomique, the French-American Cultural Exchange (FACE), the Italian Istituto Nazionale di Fisica Nucleare, the Chilean Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), the Mexican Consejo Nacional de Ciencias y Tecnología (CONACyT), the National Research Foundation of Korea, and the UK Science and Technology Facilities Council (STFC). A. C. is supported by DGAPA-PAPIIT IA101720 and CONACyT Ciencia de Frontera No. 51244 (FORDECYT-PRONACES). The Jefferson Science Associates (JSA) operates the Thomas Jefferson National Accelerator Facility for the United States Department of Energy under Contract No. DE-AC05-06OR23177.

Publisher Copyright:
© 2021 authors.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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10.1103/PhysRevLett.126.062002Licence: CC BY

PhysRevLett.126.062002Final published version, 396 KBLicence: CC BY

Cite this

@article{7c49b0be555243fa881a9ce932562cce,

title = "Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs",

abstract = "A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function e(x). Data have been collected in the Hall-B at Jefferson Lab by impinging a 5.498-GeV electron beam on a liquid-hydrogen target, and reconstructing the scattered electron and the pion pair with the CLAS detector. One-dimensional projections of the ALUsinφR moments are extracted for the kinematic variables of interest in the valence quark region. The understanding of dihadron production is essential for the interpretation of observables in single-hadron production in semi-inclusive DIS, and pioneering measurements of single-spin asymmetries in dihadron production open a new avenue in studies of QCD dynamics.",

author = "{(CLAS Collaboration)} and M. Mirazita and H. Avakian and A. Courtoy and S. Pisano and S. Adhikari and Amaryan, {M. J.} and Giovanni Angelini and H. Atac and Baltzell, {N. A.} and L. Barion and M. Battaglieri and I. Bedlinskiy and Fatiha Benmokhtar and A. Bianconi and Biselli, {A. S.} and F. Boss{\`u} and S. Boiarinov and Briscoe, {W. J.} and Brooks, {W. K.} and D. Bulumulla and Burkert, {V. D.} and Carman, {D. S.} and Carvajal, {J. C.} and A. Celentano and P. Chatagnon and T. Chetry and G. Ciullo and B. Clary and Cole, {P. L.} and M. Contalbrigo and V. Crede and A. D'Angelo and N. Dashyan and {De Vita}, R. and M. Defurne and A. Deur and S. Diehl and C. Dilks and C. Djalali and R. Dupre and H. Egiyan and M. Ehrhart and A. Alaoui and L. Fassi and P. Eugenio and S. Fegan and R. Fersch and A. Filippi and D. Watts and N. Zachariou",

note = "Funding Information: We thank the staff of the Accelerator and Physics Divisions for making the experiment possible. Special thanks to A. Bacchetta, B. Pasquini, M. Polyakov, M. Radici, P. Schweitzer, and M. Wakamatsu for useful discussions. This work was supported in part by the U.S. Department of Energy (No. DE-FG02-96ER40950) and National Science Foundation, the French Centre National de la Recherche Scientifique and Commissariat {\`a} l{\textquoteright}Energie Atomique, the French-American Cultural Exchange (FACE), the Italian Istituto Nazionale di Fisica Nucleare, the Chilean Comisi{\'o}n Nacional de Investigaci{\'o}n Cient{\'i}fica y Tecnol{\'o}gica (CONICYT), the Mexican Consejo Nacional de Ciencias y Tecnolog{\'i}a (CONACyT), the National Research Foundation of Korea, and the UK Science and Technology Facilities Council (STFC). A. C. is supported by DGAPA-PAPIIT IA101720 and CONACyT Ciencia de Frontera No. 51244 (FORDECYT-PRONACES). The Jefferson Science Associates (JSA) operates the Thomas Jefferson National Accelerator Facility for the United States Department of Energy under Contract No. DE-AC05-06OR23177. Publisher Copyright: {\textcopyright} 2021 authors. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",

year = "2021",

month = feb,

day = "12",

doi = "10.1103/PhysRevLett.126.062002",

language = "English",

volume = "126",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "6",

}

TY - JOUR

T1 - Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

AU - (CLAS Collaboration)

AU - Mirazita, M.

AU - Avakian, H.

AU - Courtoy, A.

AU - Pisano, S.

AU - Adhikari, S.

AU - Amaryan, M. J.

AU - Angelini, Giovanni

AU - Atac, H.

AU - Baltzell, N. A.

AU - Barion, L.

AU - Battaglieri, M.

AU - Bedlinskiy, I.

AU - Benmokhtar, Fatiha

AU - Bianconi, A.

AU - Biselli, A. S.

AU - Bossù, F.

AU - Boiarinov, S.

AU - Briscoe, W. J.

AU - Brooks, W. K.

AU - Bulumulla, D.

AU - Burkert, V. D.

AU - Carman, D. S.

AU - Carvajal, J. C.

AU - Celentano, A.

AU - Chatagnon, P.

AU - Chetry, T.

AU - Ciullo, G.

AU - Clary, B.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Crede, V.

AU - D'Angelo, A.

AU - Dashyan, N.

AU - De Vita, R.

AU - Defurne, M.

AU - Deur, A.

AU - Diehl, S.

AU - Dilks, C.

AU - Djalali, C.

AU - Dupre, R.

AU - Egiyan, H.

AU - Ehrhart, M.

AU - Alaoui, A.

AU - Fassi, L.

AU - Eugenio, P.

AU - Fegan, S.

AU - Fersch, R.

AU - Filippi, A.

AU - Watts, D.

AU - Zachariou, N.

N1 - Funding Information: We thank the staff of the Accelerator and Physics Divisions for making the experiment possible. Special thanks to A. Bacchetta, B. Pasquini, M. Polyakov, M. Radici, P. Schweitzer, and M. Wakamatsu for useful discussions. This work was supported in part by the U.S. Department of Energy (No. DE-FG02-96ER40950) and National Science Foundation, the French Centre National de la Recherche Scientifique and Commissariat à l’Energie Atomique, the French-American Cultural Exchange (FACE), the Italian Istituto Nazionale di Fisica Nucleare, the Chilean Comisión Nacional de Investigación Científica y Tecnológica (CONICYT), the Mexican Consejo Nacional de Ciencias y Tecnología (CONACyT), the National Research Foundation of Korea, and the UK Science and Technology Facilities Council (STFC). A. C. is supported by DGAPA-PAPIIT IA101720 and CONACyT Ciencia de Frontera No. 51244 (FORDECYT-PRONACES). The Jefferson Science Associates (JSA) operates the Thomas Jefferson National Accelerator Facility for the United States Department of Energy under Contract No. DE-AC05-06OR23177. Publisher Copyright: © 2021 authors. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/2/12

Y1 - 2021/2/12

N2 - A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function e(x). Data have been collected in the Hall-B at Jefferson Lab by impinging a 5.498-GeV electron beam on a liquid-hydrogen target, and reconstructing the scattered electron and the pion pair with the CLAS detector. One-dimensional projections of the ALUsinφR moments are extracted for the kinematic variables of interest in the valence quark region. The understanding of dihadron production is essential for the interpretation of observables in single-hadron production in semi-inclusive DIS, and pioneering measurements of single-spin asymmetries in dihadron production open a new avenue in studies of QCD dynamics.

AB - A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function e(x). Data have been collected in the Hall-B at Jefferson Lab by impinging a 5.498-GeV electron beam on a liquid-hydrogen target, and reconstructing the scattered electron and the pion pair with the CLAS detector. One-dimensional projections of the ALUsinφR moments are extracted for the kinematic variables of interest in the valence quark region. The understanding of dihadron production is essential for the interpretation of observables in single-hadron production in semi-inclusive DIS, and pioneering measurements of single-spin asymmetries in dihadron production open a new avenue in studies of QCD dynamics.

UR - http://www.scopus.com/inward/record.url?scp=85100901875&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.126.062002

DO - 10.1103/PhysRevLett.126.062002

M3 - Article

AN - SCOPUS:85100901875

SN - 0031-9007

VL - 126

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 062002

ER -

Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

Abstract

Bibliographical note

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Other files and links

Nuclear Physics Consolidated Grant 2021-2024

Cite this

Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

Abstract

Bibliographical note

Access to Document

Other files and links

Projects

Nuclear Physics Consolidated Grant 2021-2024

Cite this