Suppression of neutral-pion production in deep-inelastic scattering off nuclei with the CLAS detector

CLAS Collaboration

doi:10.1103/kbhz-h4jv

Suppression of neutral-pion production in deep-inelastic scattering off nuclei with the CLAS detector

CLAS Collaboration

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

Abstract

We present the first threefold differential measurement for neutral-pion multiplicity ratios produced in semi-inclusive deep-inelastic electron scattering on carbon, iron, and lead nuclei normalized to deuterium from CLAS at Jefferson Lab. We found that the neutral-pion multiplicity ratio is maximally suppressed for the leading hadrons (energy fraction z → 1), suppression varying from 25% in carbon up to 75% in lead. An enhancement of the multiplicity ratio at low z and high p²_T is observed, suggesting an interconnection between these two variables. This behavior is qualitatively similar to the previous twofold differential measurement of charged pions by the HERMES Collaboration and, recently, by CLAS Collaboration. The largest enhancement was observed at high p²_T for heavier nuclei, namely, iron and lead, while the smallest enhancement was observed for the lightest nucleus, carbon. This behavior suggests a competition between partonic multiple scattering, which causes enhancement, and hadronic inelastic scattering, which causes suppression.

Original language	English
Article number	035203
Journal	Physical Review C
Volume	112
Issue number	3
DOIs	https://doi.org/10.1103/kbhz-h4jv
State	Published - Sep 4 2025
Externally published	Yes

Funding

Fisica Nucleare (INFN), the French Centre National de la Recherche Scientifique (CNRS), the French Commissariat à l’Energie Atomique (CEA), the Skobeltsyn Institute of Nuclear Physics (SINP), the Scottish Universities Physics Alliance (SUPA), the National Research Foundation of Korea (NRF), the UK Science and Technology Facilities Council (STFC). The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility for the U.S. Department of Energy under Contract No. DE-AC05-06OR23177. The authors would like to thank Dave Gaskell for fruitful discussions on radiative corrections with the external code. We acknowledge the staff of the Accelerator and the Physics Divisions at Jefferson Lab in making this experiment possible. This work is supported by the Chilean Agencia Nacional de Investigacion y Desarollo (ANID), FONDECYT Grants No. 1221827 and No. 1240904, ANID PIA/APOYO AFB230003 and by the ANID-Millennium Science Initiative Program—ICN2019_044. This work was supported in part by the U.S. Department of Energy (DOE) and National Science Foundation (NSF), the Italian Istituto Nazionale di

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@article{4dcb1518641e49a991ed0c071e3efafc,

title = "Suppression of neutral-pion production in deep-inelastic scattering off nuclei with the CLAS detector",

abstract = "We present the first threefold differential measurement for neutral-pion multiplicity ratios produced in semi-inclusive deep-inelastic electron scattering on carbon, iron, and lead nuclei normalized to deuterium from CLAS at Jefferson Lab. We found that the neutral-pion multiplicity ratio is maximally suppressed for the leading hadrons (energy fraction z → 1), suppression varying from 25\% in carbon up to 75\% in lead. An enhancement of the multiplicity ratio at low z and high p2T is observed, suggesting an interconnection between these two variables. This behavior is qualitatively similar to the previous twofold differential measurement of charged pions by the HERMES Collaboration and, recently, by CLAS Collaboration. The largest enhancement was observed at high p2T for heavier nuclei, namely, iron and lead, while the smallest enhancement was observed for the lightest nucleus, carbon. This behavior suggests a competition between partonic multiple scattering, which causes enhancement, and hadronic inelastic scattering, which causes suppression.",

author = "\{CLAS Collaboration\} and T. Mineeva and Brooks, \{W. K.\} and \{El Alaoui\}, A. and H. Hakobyan and K. Joo and L{\'o}pez, \{J. A.\} and O. Soto and P. Achenbach and Z. Akbar and Alvarado, \{J. S.\} and Armstrong, \{W. R.\} and M. Arratia and H. Atac and H. Avagyan and Gayoso, \{C. Ayerbe\} and L. Baashen and L. Barion and M. Bashkanov and I. Bedlinskiy and B. Benkel and F. Benmokhtar and A. Bianconi and Biselli, \{A. S.\} and F. Boss{\`u} and S. Boiarinov and Brinkmann, \{K. T.\} and Briscoe, \{W. J.\} and Burkert, \{V. D.\} and T. Cao 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{\textquoteright}Angelo and N. Dashyan and \{De Vita\}, R. and M. Defurne and A. Deur and S. Diehl and C. Djalali and R. Dupre and H. Egiyan and M. Yurov",

year = "2025",

month = sep,

day = "4",

doi = "10.1103/kbhz-h4jv",

language = "English",

volume = "112",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "3",

}

TY - JOUR

T1 - Suppression of neutral-pion production in deep-inelastic scattering off nuclei with the CLAS detector

AU - CLAS Collaboration

AU - Mineeva, T.

AU - Brooks, W. K.

AU - El Alaoui, A.

AU - Hakobyan, H.

AU - Joo, K.

AU - López, J. A.

AU - Soto, O.

AU - Achenbach, P.

AU - Akbar, Z.

AU - Alvarado, J. S.

AU - Armstrong, W. R.

AU - Arratia, M.

AU - Atac, H.

AU - Avagyan, H.

AU - Gayoso, C. Ayerbe

AU - Baashen, L.

AU - Barion, L.

AU - Bashkanov, M.

AU - Bedlinskiy, I.

AU - Benkel, B.

AU - Benmokhtar, F.

AU - Bianconi, A.

AU - Biselli, A. S.

AU - Bossù, F.

AU - Boiarinov, S.

AU - Brinkmann, K. T.

AU - Briscoe, W. J.

AU - Burkert, V. D.

AU - Cao, T.

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 - De Vita, R.

AU - Defurne, M.

AU - Deur, A.

AU - Diehl, S.

AU - Djalali, C.

AU - Dupre, R.

AU - Egiyan, H.

AU - Yurov, M.

PY - 2025/9/4

Y1 - 2025/9/4

N2 - We present the first threefold differential measurement for neutral-pion multiplicity ratios produced in semi-inclusive deep-inelastic electron scattering on carbon, iron, and lead nuclei normalized to deuterium from CLAS at Jefferson Lab. We found that the neutral-pion multiplicity ratio is maximally suppressed for the leading hadrons (energy fraction z → 1), suppression varying from 25% in carbon up to 75% in lead. An enhancement of the multiplicity ratio at low z and high p2T is observed, suggesting an interconnection between these two variables. This behavior is qualitatively similar to the previous twofold differential measurement of charged pions by the HERMES Collaboration and, recently, by CLAS Collaboration. The largest enhancement was observed at high p2T for heavier nuclei, namely, iron and lead, while the smallest enhancement was observed for the lightest nucleus, carbon. This behavior suggests a competition between partonic multiple scattering, which causes enhancement, and hadronic inelastic scattering, which causes suppression.

AB - We present the first threefold differential measurement for neutral-pion multiplicity ratios produced in semi-inclusive deep-inelastic electron scattering on carbon, iron, and lead nuclei normalized to deuterium from CLAS at Jefferson Lab. We found that the neutral-pion multiplicity ratio is maximally suppressed for the leading hadrons (energy fraction z → 1), suppression varying from 25% in carbon up to 75% in lead. An enhancement of the multiplicity ratio at low z and high p2T is observed, suggesting an interconnection between these two variables. This behavior is qualitatively similar to the previous twofold differential measurement of charged pions by the HERMES Collaboration and, recently, by CLAS Collaboration. The largest enhancement was observed at high p2T for heavier nuclei, namely, iron and lead, while the smallest enhancement was observed for the lightest nucleus, carbon. This behavior suggests a competition between partonic multiple scattering, which causes enhancement, and hadronic inelastic scattering, which causes suppression.

UR - https://www.scopus.com/pages/publications/105020642644

U2 - 10.1103/kbhz-h4jv

DO - 10.1103/kbhz-h4jv

M3 - Article

AN - SCOPUS:105020642644

SN - 2469-9985

VL - 112

JO - Physical Review C

JF - Physical Review C

IS - 3

M1 - 035203

ER -

Suppression of neutral-pion production in deep-inelastic scattering off nuclei with the CLAS detector

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