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Measurement of transverse polarization of Λ and hyperons inside jets in unpolarized proton-proton collisions at GeV

Journal articles  - Journal Article
Aboona, BE; Adam, J; Agakishiev, G; Aggarwal, I; Aggarwal, MM; Ahammed, Z; Aitbayev, A; Alekseev, I; Alpatov, E; Alshammri, AK; Aparin, A ...
Published in: Journal of High Energy Physics
June 1, 2026
Published version (DOI)

A surprisingly large transverse polarization of Λ hyperons in unpolarized hadron-nucleon/nucleus collisions has been observed for 50 years, and the origin of this polarization remains an important open question. Recently, theoretical frameworks have advanced in describing this puzzle with the polarizing fragmentation function (PFF). We report the first measurement of Λ and transverse polarization inside jets in unpolarized proton-proton collisions, which is directly attributed to the PFF. The polarization is measured as a function of the jet transverse momentum, the fraction of the jet momentum carried by hyperons, and the transverse momentum of hyperons relative to the jet axis. Covering a wide jet-energy range, these data provide the first constraints on the gluon PFF and allow tests of TMD evolution and its universality.

Duke Scholars

Seog Oh
Author Seog Oh Physics
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Published In

Journal of High Energy Physics

DOI

10.1007/JHEP06(2026)050

EISSN

1029-8479

Publication Date

June 1, 2026

Volume

2026

Issue

6

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics
 

Citation

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Aboona, B. E., Adam, J., Agakishiev, G., Aggarwal, I., Aggarwal, M. M., Ahammed, Z., … Havener, L. B. (2026). Measurement of transverse polarization of Λ and hyperons inside jets in unpolarized proton-proton collisions at GeV. Journal of High Energy Physics, 2026(6). https://doi.org/10.1007/JHEP06(2026)050
Aboona, B. E., J. Adam, G. Agakishiev, I. Aggarwal, M. M. Aggarwal, Z. Ahammed, A. Aitbayev, et al. “Measurement of transverse polarization of Λ and hyperons inside jets in unpolarized proton-proton collisions at GeV.” Journal of High Energy Physics 2026, no. 6 (June 1, 2026). https://doi.org/10.1007/JHEP06(2026)050.
Aboona BE, Adam J, Agakishiev G, Aggarwal I, Aggarwal MM, Ahammed Z, et al. Measurement of transverse polarization of Λ and hyperons inside jets in unpolarized proton-proton collisions at GeV. Journal of High Energy Physics. 2026 Jun 1;2026(6).
Aboona, B. E., et al. “Measurement of transverse polarization of Λ and hyperons inside jets in unpolarized proton-proton collisions at GeV.” Journal of High Energy Physics, vol. 2026, no. 6, June 2026. Scopus, doi:10.1007/JHEP06(2026)050.
Aboona BE, Adam J, Agakishiev G, Aggarwal I, Aggarwal MM, Ahammed Z, Aitbayev A, Alekseev I, Alpatov E, Alshammri AK, Aparin A, Aslam S, Atchison J, Averichev GS, Bairathi V, Bao X, Barik P, Barish K, Behera S, Bhagat P, Bhasin A, Bhatta S, Bordyuzhin IG, Brandenburg JD, Brandin AV, Broodo C, Cai XZ, Caines H, Calderon de la Barca Sanchez M, Cebra D, Ceska J, Chakaberia I, Chang YS, Chang Z, Chatterjee A, Chen D, Chen JH, Chen L, Chen Q, Chen W, Chen Z, Cheng J, Cheng Y, Christie W, Chu X, Corey S, Crawford HJ, Dale-Gau G, Das A, De Souza Lemos D, Dedovich TG, Deppner IM, Derevschikov AA, Deshpande A, Dhamija A, Dimri A, Dixit P, Dong X, Drachenberg JL, Duckworth E, Dunlop JC, El-Feky YS, Engelage J, Eppley G, Esumi S, Evdokimov O, Eyser O, Fan B, Fang Y, Fatemi R, Fazio S, Feng H, Feng Y, Finch E, Fisyak Y, Flor FA, Fu B, Fu C, Fu T, Gao T, Gao Y, Garcia G, Geurts F, Gibson A, Giri A, Gopal K, Gordon M, Gou X, Grosnick D, Gu A, Gu J, Gupta A, Hamed A, Hamilton RJ, Han J, Han X, Harasty MD, Harris JW, Harrison-Smith H, Havener LB. Measurement of transverse polarization of Λ and hyperons inside jets in unpolarized proton-proton collisions at GeV. Journal of High Energy Physics. 2026 Jun 1;2026(6).
Journal cover image

Published In

Journal of High Energy Physics

DOI

10.1007/JHEP06(2026)050

EISSN

1029-8479

Publication Date

June 1, 2026

Volume

2026

Issue

6

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics