Polarization Measurement of Λc+ and Λ  ̄ c- Baryons in p-Ne Collisions at sNN =68.6 GeV

LHCb Collaboration

doi:10.1103/pb8c-3lnn

Polarization Measurement of Λc+ and Λ ̄ c- Baryons in p-Ne Collisions at sNN =68.6 GeV

LHCb Collaboration

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Abstract

The first measurement of the polarization of charm baryons by the LHCb experiment recorded in fixed-target mode is presented. The polarization of Λc baryons is studied in collisions of protons, at an energy of 2.51 TeV, incident on a gaseous target of neon, at a nucleon-nucleon center-of-mass energy of 68.6 GeV. The world's first measurement of separate-charge polarizations for Λc+ and Λ¯c- baryons is performed, determining PΛc+=(24±9±2)%, PΛ¯c-=(-8±12±3)%, where the first uncertainty is statistical and the second systematic. The polarization is also measured in intervals of baryon transverse momentum and the Feynman-x variable.

Original language	English
Article number	091901
Journal	Physical Review Letters
Volume	137
Issue number	9
DOIs	https://doi.org/10.1103/pb8c-3lnn
State	Published - 28 Aug 2026

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10.1103/pb8c-3lnn

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@article{6306f64f7d1240f3ac67454287c99012,

title = "Polarization Measurement of Λc+ and Λ{\= } c- Baryons in p-Ne Collisions at sNN =68.6 GeV",

abstract = "The first measurement of the polarization of charm baryons by the LHCb experiment recorded in fixed-target mode is presented. The polarization of Λc baryons is studied in collisions of protons, at an energy of 2.51 TeV, incident on a gaseous target of neon, at a nucleon-nucleon center-of-mass energy of 68.6 GeV. The world's first measurement of separate-charge polarizations for Λc+ and Λ¯c- baryons is performed, determining PΛc+=(24±9±2)\%, PΛ¯c-=(-8±12±3)\%, where the first uncertainty is statistical and the second systematic. The polarization is also measured in intervals of baryon transverse momentum and the Feynman-x variable.",

author = "\{LHCb Collaboration\} and R. Aaij and Abdelmotteleb, \{A. S.W.\} and \{Abellan Beteta\}, C. and F. Abudin{\'e}n and T. Ackernley and Adefisoye, \{A. A.\} and B. Adeva and M. Adinolfi and P. Adlarson and C. Agapopoulou and Aidala, \{C. A.\} and Z. Ajaltouni and S. Akar and K. Akiba and P. Albicocco and J. Albrecht and R. Aleksiejunas and F. Alessio and \{Alvarez Cartelle\}, P. and R. Amalric and S. Amato and Amey, \{J. L.\} and Y. Amhis and L. An and L. Anderlini and M. Andersson and P. Andreola and M. Andreotti and \{Andres Estrada\}, S. and A. Anelli and D. Ao and C. Arata and F. Archilli and Z. Areg and M. Argenton and \{Arguedas Cuendis\}, S. and L. Arnone and A. Artamonov and M. Artuso and E. Aslanides and \{Ata{\'i}de Da Silva\}, R. and M. Atzeni and B. Audurier and Authier, \{J. A.\} and D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and M. Bachmayer and Milanes, \{D. A.\} and E. Shmanin",

note = "Publisher Copyright: {\textcopyright} 2026 CERN.",

year = "2026",

month = aug,

day = "28",

doi = "10.1103/pb8c-3lnn",

language = "English",

volume = "137",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "9",

}

TY - JOUR

T1 - Polarization Measurement of Λc+ and Λ ̄ c- Baryons in p-Ne Collisions at sNN =68.6 GeV

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abdelmotteleb, A. S.W.

AU - Abellan Beteta, C.

AU - Abudinén, F.

AU - Ackernley, T.

AU - Adefisoye, A. A.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adlarson, P.

AU - Agapopoulou, C.

AU - Aidala, C. A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Akiba, K.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Aleksiejunas, R.

AU - Alessio, F.

AU - Alvarez Cartelle, P.

AU - Amalric, R.

AU - Amato, S.

AU - Amey, J. L.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andersson, M.

AU - Andreola, P.

AU - Andreotti, M.

AU - Andres Estrada, S.

AU - Anelli, A.

AU - Ao, D.

AU - Arata, C.

AU - Archilli, F.

AU - Areg, Z.

AU - Argenton, M.

AU - Arguedas Cuendis, S.

AU - Arnone, L.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Ataíde Da Silva, R.

AU - Atzeni, M.

AU - Audurier, B.

AU - Authier, J. A.

AU - Bacher, D.

AU - Bachiller Perea, I.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Milanes, D. A.

AU - Shmanin, E.

PY - 2026/8/28

Y1 - 2026/8/28

N2 - The first measurement of the polarization of charm baryons by the LHCb experiment recorded in fixed-target mode is presented. The polarization of Λc baryons is studied in collisions of protons, at an energy of 2.51 TeV, incident on a gaseous target of neon, at a nucleon-nucleon center-of-mass energy of 68.6 GeV. The world's first measurement of separate-charge polarizations for Λc+ and Λ¯c- baryons is performed, determining PΛc+=(24±9±2)%, PΛ¯c-=(-8±12±3)%, where the first uncertainty is statistical and the second systematic. The polarization is also measured in intervals of baryon transverse momentum and the Feynman-x variable.

AB - The first measurement of the polarization of charm baryons by the LHCb experiment recorded in fixed-target mode is presented. The polarization of Λc baryons is studied in collisions of protons, at an energy of 2.51 TeV, incident on a gaseous target of neon, at a nucleon-nucleon center-of-mass energy of 68.6 GeV. The world's first measurement of separate-charge polarizations for Λc+ and Λ¯c- baryons is performed, determining PΛc+=(24±9±2)%, PΛ¯c-=(-8±12±3)%, where the first uncertainty is statistical and the second systematic. The polarization is also measured in intervals of baryon transverse momentum and the Feynman-x variable.

UR - https://www.scopus.com/pages/publications/105050187323

U2 - 10.1103/pb8c-3lnn

DO - 10.1103/pb8c-3lnn

M3 - Article

AN - SCOPUS:105050187323

SN - 0031-9007

VL - 137

JO - Physical Review Letters

JF - Physical Review Letters

IS - 9

M1 - 091901

ER -

Polarization Measurement of Λc+ and Λ ̄ c- Baryons in p-Ne Collisions at sNN =68.6 GeV

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