First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12

CLAS Collaboration

First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12

CLAS Collaboration

Physics

Research output: Working paper › Preprint

Abstract

We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction, where two hadrons are produced in opposite hemispheres along the z-axis in the center-of-mass frame, with the first hadron produced in the current-fragmentation region and the second in the target-fragmentation region. The data were taken with longitudinally polarized electron beams of 10.2 and 10.6 GeV incident on an unpolarized liquid-hydrogen target using the CLAS12 spectrometer at Jefferson Lab. Observed non-zero $\sin\Delta\phi$ modulations in $ep \rightarrow e'p\pi^+X$ events, where $\Delta\phi$ is the difference of the azimuthal angles of the proton and pion in the virtual photon and target nucleon center-of-mass frame, indicate that correlations between the spin and transverse momenta of hadrons produced in the target- and current-fragmentation regions may be significant. The measured beam-spin asymmetries provide a first access in dihadron production to a previously unobserved leading-twist spin- and transverse-momentum-dependent fracture function. The fracture functions describe the hadronization of the target remnant after the hard scattering of a virtual photon off a quark in the target particle and provide a new avenue for studying nucleonic structure and hadronization.

Original language	Undefined/Unknown
Publisher	arXiv
Publication status	Published - 10 Aug 2022

Bibliographical note

7 pages, 6 figures

Keywords

hep-ex
nucl-ex

Access to Document

2208.05086v1

Cite this

@techreport{a81cb12f038e44379e492aa43f0ecc22,

title = "First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12",

abstract = "We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction, where two hadrons are produced in opposite hemispheres along the z-axis in the center-of-mass frame, with the first hadron produced in the current-fragmentation region and the second in the target-fragmentation region. The data were taken with longitudinally polarized electron beams of 10.2 and 10.6 GeV incident on an unpolarized liquid-hydrogen target using the CLAS12 spectrometer at Jefferson Lab. Observed non-zero $\sin\Delta\phi$ modulations in $ep \rightarrow e'p\pi^+X$ events, where $\Delta\phi$ is the difference of the azimuthal angles of the proton and pion in the virtual photon and target nucleon center-of-mass frame, indicate that correlations between the spin and transverse momenta of hadrons produced in the target- and current-fragmentation regions may be significant. The measured beam-spin asymmetries provide a first access in dihadron production to a previously unobserved leading-twist spin- and transverse-momentum-dependent fracture function. The fracture functions describe the hadronization of the target remnant after the hard scattering of a virtual photon off a quark in the target particle and provide a new avenue for studying nucleonic structure and hadronization.",

keywords = "hep-ex, nucl-ex",

author = "{CLAS Collaboration} and H. Avakian and Hayward, {T. B.} and A. Kotzinian and Armstrong, {W. R.} and H. Atac and Gayoso, {C. Ayerbe} and L. Baashen and Baltzell, {N. A.} and L. Barion and M. Bashkanov and M. Battaglieri and I. Bedlinskiy and F. Benmokhtar and A. Bianconi and L. Biondo and Biselli, {A. S.} and M. Bondi and S. Boiarinov and F. Boss{\`u} and Brinkman, {K. T.} and Briscoe, {W. J.} and S. Bueltmann and D. Bulumulla and Burkert, {V. D.} and R. Capobianco and Carman, {D. S.} and Carvajal, {J. C.} and A. Celentano and P. Chatagnon and V. Chesnokov and T. Chetry and G. Ciullo and Cole, {P. L.} and M. Contalbrigo and G. Costantini and A. D'Angelo and N. Dashyan and Vita, {R. De} and M. Defurne and A. Deur and S. Diehl and C. Dilks and C. Djalali and R. Dupre and H. Egiyan and Alaoui, {A. El} and S. Fegan and M. Nicol and Watts, {D. P.} and N. Zachariou",

note = "7 pages, 6 figures",

year = "2022",

month = aug,

day = "10",

language = "Undefined/Unknown",

publisher = "arXiv",

type = "WorkingPaper",

institution = "arXiv",

}

TY - UNPB

T1 - First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12

AU - CLAS Collaboration

AU - Avakian, H.

AU - Hayward, T. B.

AU - Kotzinian, A.

AU - Armstrong, W. R.

AU - Atac, H.

AU - Gayoso, C. Ayerbe

AU - Baashen, L.

AU - Baltzell, N. A.

AU - Barion, L.

AU - Bashkanov, M.

AU - Battaglieri, M.

AU - Bedlinskiy, I.

AU - Benmokhtar, F.

AU - Bianconi, A.

AU - Biondo, L.

AU - Biselli, A. S.

AU - Bondi, M.

AU - Boiarinov, S.

AU - Bossù, F.

AU - Brinkman, K. T.

AU - Briscoe, W. J.

AU - Bueltmann, S.

AU - Bulumulla, D.

AU - Burkert, V. D.

AU - Capobianco, R.

AU - Carman, D. S.

AU - Carvajal, J. C.

AU - Celentano, A.

AU - Chatagnon, P.

AU - Chesnokov, V.

AU - Chetry, T.

AU - Ciullo, G.

AU - Cole, P. L.

AU - Contalbrigo, M.

AU - Costantini, G.

AU - D'Angelo, A.

AU - Dashyan, N.

AU - Vita, R. De

AU - Defurne, M.

AU - Deur, A.

AU - Diehl, S.

AU - Dilks, C.

AU - Djalali, C.

AU - Dupre, R.

AU - Egiyan, H.

AU - Alaoui, A. El

AU - Fegan, S.

AU - Nicol, M.

AU - Watts, D. P.

AU - Zachariou, N.

N1 - 7 pages, 6 figures

PY - 2022/8/10

Y1 - 2022/8/10

N2 - We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction, where two hadrons are produced in opposite hemispheres along the z-axis in the center-of-mass frame, with the first hadron produced in the current-fragmentation region and the second in the target-fragmentation region. The data were taken with longitudinally polarized electron beams of 10.2 and 10.6 GeV incident on an unpolarized liquid-hydrogen target using the CLAS12 spectrometer at Jefferson Lab. Observed non-zero $\sin\Delta\phi$ modulations in $ep \rightarrow e'p\pi^+X$ events, where $\Delta\phi$ is the difference of the azimuthal angles of the proton and pion in the virtual photon and target nucleon center-of-mass frame, indicate that correlations between the spin and transverse momenta of hadrons produced in the target- and current-fragmentation regions may be significant. The measured beam-spin asymmetries provide a first access in dihadron production to a previously unobserved leading-twist spin- and transverse-momentum-dependent fracture function. The fracture functions describe the hadronization of the target remnant after the hard scattering of a virtual photon off a quark in the target particle and provide a new avenue for studying nucleonic structure and hadronization.

AB - We report the first measurements of deep inelastic scattering spin-dependent azimuthal asymmetries in back-to-back dihadron electroproduction, where two hadrons are produced in opposite hemispheres along the z-axis in the center-of-mass frame, with the first hadron produced in the current-fragmentation region and the second in the target-fragmentation region. The data were taken with longitudinally polarized electron beams of 10.2 and 10.6 GeV incident on an unpolarized liquid-hydrogen target using the CLAS12 spectrometer at Jefferson Lab. Observed non-zero $\sin\Delta\phi$ modulations in $ep \rightarrow e'p\pi^+X$ events, where $\Delta\phi$ is the difference of the azimuthal angles of the proton and pion in the virtual photon and target nucleon center-of-mass frame, indicate that correlations between the spin and transverse momenta of hadrons produced in the target- and current-fragmentation regions may be significant. The measured beam-spin asymmetries provide a first access in dihadron production to a previously unobserved leading-twist spin- and transverse-momentum-dependent fracture function. The fracture functions describe the hadronization of the target remnant after the hard scattering of a virtual photon off a quark in the target particle and provide a new avenue for studying nucleonic structure and hadronization.

KW - hep-ex

KW - nucl-ex

M3 - Preprint

BT - First observation of correlations between spin and transverse momenta in back-to-back dihadron production at CLAS12

PB - arXiv

ER -