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

Aaij, R.; Abdelmotteleb, A. S.W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapopoulou, C.; Aidala, C. A.; Ajaltouni, Z.; Akar, S.; Akiba, K.; Albicocco, P.; Albrecht, J.; Aleksiejunas, R.; Alessio, F.; Alvarez Cartelle, P.; Amalric, R.; Amato, S.; Amey, J. L.; Amhis, Y.; An, L.; Anderlini, L.; Andersson, M.; Andreola, P.; Andreotti, M.; Andres Estrada, S.; Anelli, A.; Ao, D.; Arata, C.; Archilli, F.; Areg, Z.; Argenton, M.; Arguedas Cuendis, S.; Arnone, L.; Artamonov, A.; Artuso, M.; Aslanides, E.; Ataíde Da Silva, R.; Atzeni, M.; Audurier, B.; Authier, J. A.; Bacher, D.; Bachiller Perea, I.; Bachmann, S.; Bachmayer, M.; Back, J. J.; Bai, Z. B.; Baladron Rodriguez, P.; Balagura, V.; Balboni, A.; Baldini, W.; Baldwin, Z.; Balzani, L.; Bao, H.; Baptista De Souza Leite, J.; Barbero Pretel, C.; Barbetti, M.; Barbosa, I. R.; Barlow, R. J.; Barnyakov, M.; Barsuk, S.; Barter, W.; Bartz, J.; Bashir, S.; Batsukh, B.; Battista, P. B.; Bavarchee, A.; Bay, A.; Beck, A.; Becker, M.; Bedeschi, F.; Bediaga, I. B.; Behling, N. A.; Belin, S.; Bellavista, A.; Belous, K.; Belov, I.; Belyaev, I.; Benane, G.; Bencivenni, G.; Ben-Haim, E.; Berezhnoy, A.; Bernet, R.; Bertolin, A.; Betti, F.; Bex, J.; Bezshyyko, O.; Bhattacharya, S.; Bieker, M. S.; Biesuz, N. V.; Biolchini, A.; Birch, M.; Bishop, F. C.R.; Bitadze, A.; Bizzeti, A.; Blake, T.; Blanc, F.; et al.

doi:10.1103/pb8c-3lnn

research article

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

Aaij, R.

•

Abdelmotteleb, A. S.W.

•

Abellan Beteta, C.

August 28, 2026

Physical Review Letters

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.

Cite this item

Aaij, R., Abdelmotteleb, A. S. W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. A., Adeva, B., Adinolfi, M., Adlarson, P., Agapopoulou, C., Aidala, C. A., Ajaltouni, Z., Akar, S., Akiba, K., Albicocco, P., Albrecht, J., Aleksiejunas, R., Alessio, F., Alvarez Cartelle, P., et al. (2026). Polarization Measurement of Λc+ and Λ ¯ c- Baryons in p-Ne Collisions at sNN =68.6 GeV. Physical Review Letters, 137(9), Article 091901. https://doi.org/10.1103/pb8c-3lnn

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