Open Access

Amplitude analysis of the $Ξ_{c}^{+} \to p K^{-} π^{+}$ decay and $Ξ_{c}^{+}$ baryon polarization measurement in semileptonic beauty-hadron decays

R. Aaij ³⁸, A. S. W. Abdelmotteleb ⁵⁷, C. Abellan Beteta ⁵¹, F. Abudinén ⁵⁷, T. Ackernley ⁶¹, A. A. Adefisoye ⁶⁹, B. Adeva ⁴⁷, M. Adinolfi ⁵⁵, P. Adlarson ⁸² et al. (LHCb Collaboration)

P. Adlarson ⁸², C. Agapopoulou ¹⁴, C. A. Aidala ⁸³, Z. Ajaltouni¹¹, S. Akar ⁶⁶, K. Akiba ³⁸, P. Albicocco ²⁸, J. Albrecht ^19,b, F. Alessio ⁴⁹, Z. Aliouche ⁶³, P. Alvarez Cartelle ⁵⁶, R. Amalric ¹⁶, S. Amato ³, J. L. Amey ⁵⁵, Y. Amhis ¹⁴, L. An ⁶, L. Anderlini ²⁷, M. Andersson ⁵¹, A. Andreianov ⁴⁴, P. Andreola ⁵¹, M. Andreotti ²⁶, D. Andreou ⁶⁹, A. Anelli ^31,c, D. Ao ⁷, F. Archilli ^37,d, M. Argenton ²⁶, S. Arguedas Cuendis ^9,49, A. Artamonov ⁴⁴, M. Artuso ⁶⁹, E. Aslanides ¹³, R. Ataíde Da Silva ⁵⁰, M. Atzeni ⁶⁵, B. Audurier ¹², D. Bacher ⁶⁴, I. Bachiller Perea ¹⁰, S. Bachmann ²², M. Bachmayer ⁵⁰, J. J. Back ⁵⁷, P. Baladron Rodriguez ⁴⁷, V. Balagura ¹⁵, A. Balboni ²⁶, W. Baldini ²⁶, L. Balzani ¹⁹, H. Bao ⁷, J. Baptista de Souza Leite ⁶¹, C. Barbero Pretel ^47,12, M. Barbetti ²⁷, I. R. Barbosa ⁷⁰, R. J. Barlow ⁶³, M. Barnyakov ²⁵, S. Barsuk ¹⁴, W. Barter ⁵⁹, M. Bartolini ⁵⁶, J. Bartz ⁶⁹, J. M. Basels ¹⁷, S. Bashir ⁴⁰, G. Bassi ^35,e, B. Batsukh ⁵, P. B. Battista ¹⁴, A. Bay ⁵⁰, A. Beck ⁵⁷, M. Becker ¹⁹, F. Bedeschi ³⁵, I. B. Bediaga ², N. A. Behling ¹⁹, S. Belin ⁴⁷, K. Belous ⁴⁴, I. Belov ²⁹, I. Belyaev ³⁶, G. Benane ¹³, G. Bencivenni ²⁸, E. Ben-Haim ¹⁶, A. Berezhnoy ⁴⁴, R. Bernet ⁵¹, S. Bernet Andres ⁴⁶, A. Bertolin ³³, C. Betancourt ⁵¹, F. Betti ⁵⁹, J. Bex ⁵⁶, Ia. Bezshyiko ⁵¹, J. Bhom ⁴¹, M. S. Bieker ¹⁹, N. V. Biesuz ²⁶, P. Billoir ¹⁶, A. Biolchini ³⁸, M. Birch ⁶², F. C. R. Bishop ¹⁰, A. Bitadze ⁶³, A. Bizzeti ^27,f, T. Blake ⁵⁷, F. Blanc ⁵⁰, J. E. Blank ¹⁹, S. Blusk ⁶⁹, V. Bocharnikov ⁴⁴, J. A. Boelhauve ¹⁹, O. Boente Garcia ¹⁵, T. Boettcher ⁶⁶, A. Bohare ⁵⁹, A. Boldyrev ⁴⁴, C. S. Bolognani ⁷⁹, R. Bolzonella ^26,g, R. B. Bonacci ¹, N. Bondar ⁴⁴, A. Bordelius ⁴⁹, F. Borgato ^33,h, S. Borghi ⁶³, M. Borsato ^31,c, J. T. Borsuk ⁴¹, S. A. Bouchiba ⁵⁰, M. Bovill ⁶⁴, T. J. V. Bowcock ⁶¹, A. Boyer ⁴⁹, C. Bozzi ²⁶, A. Brea Rodriguez ⁵⁰, N. Breer ¹⁹, J. Brodzicka ⁴¹, A. Brossa Gonzalo ^47,a, J. Brown ⁶¹, D. Brundu ³², E. Buchanan ⁵⁹, A. Buonaura ⁵¹, L. Buonincontri ^33,h, A. T. Burke ⁶³, C. Burr ⁴⁹, J. S. Butter ⁵⁶, J. Buytaert ⁴⁹, W. Byczynski ⁴⁹, S. Cadeddu ³², H. Cai ⁷⁴, A. Caillet ¹⁶, R. Calabrese ^26,g, S. Calderon Ramirez ⁹, L. Calefice ⁴⁵, S. Cali ²⁸, M. Calvi ^31,c, M. Calvo Gomez ⁴⁶, P. Camargo Magalhaes ^2,i, J. I. Cambon Bouzas ⁴⁷, P. Campana ²⁸, D. H. Campora Perez ⁷⁹, A. F. Campoverde Quezada ⁷, S. Capelli ³¹, L. Capriotti ²⁶, R. Caravaca-Mora ⁹, A. Carbone ^25,j, L. Carcedo Salgado ⁴⁷, R. Cardinale ^29,k, A. Cardini ³², P. Carniti ^31,c, L. Carus ²², A. Casais Vidal ⁶⁵, R. Caspary ²², G. Casse ⁶¹, M. Cattaneo ⁴⁹, G. Cavallero ^26,49, V. Cavallini ^26,g, S. Celani ²², D. Cervenkov ⁶⁴, S. Cesare ^30,l, A. J. Chadwick ⁶¹, I. Chahrour ⁸³, M. Charles ¹⁶, Ph. Charpentier ⁴⁹, E. Chatzianagnostou ³⁸, M. Chefdeville ¹⁰, C. Chen ¹³, S. Chen ⁵, Z. Chen ⁷, A. Chernov ⁴¹, S. Chernyshenko ⁵³, X. Chiotopoulos ⁷⁹, V. Chobanova ⁸¹, S. Cholak ⁵⁰, M. Chrzaszcz ⁴¹, A. Chubykin ⁴⁴, V. Chulikov ²⁸, P. Ciambrone ²⁸, X. Cid Vidal ⁴⁷, G. 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Ferro-Luzzi ⁴⁹, S. Filippov ⁴⁴, R. A. Fini ²⁴, M. Fiorini ^26,g, M. Firlej ⁴⁰, K. L. Fischer ⁶⁴, D. S. Fitzgerald ⁸³, C. Fitzpatrick ⁶³, T. Fiutowski ⁴⁰, F. Fleuret ¹⁵, M. Fontana ²⁵, L. F. Foreman ⁶³, R. Forty ⁴⁹, D. Foulds-Holt ⁵⁶, V. Franco Lima ³, M. Franco Sevilla ⁶⁷, M. Frank ⁴⁹, E. Franzoso ^26,g, G. Frau ⁶³, C. Frei ⁴⁹, D. A. Friday ⁶³, J. Fu ⁷, Q. Führing ^19,56,b, Y. Fujii ¹, T. Fulghesu ¹⁶, E. Gabriel ³⁸, G. Galati ²⁴, M. D. Galati ³⁸, A. Gallas Torreira ⁴⁷, D. Galli ^25,j, S. Gambetta ⁵⁹, M. Gandelman ³, P. Gandini ³⁰, B. Ganie ⁶³, H. Gao ⁷, R. Gao ⁶⁴, T. Q. Gao ⁵⁶, Y. Gao ⁸, Y. Gao ⁶, Y. Gao ⁸, L. M. Garcia Martin ⁵⁰, P. Garcia Moreno ⁴⁵, J. García Pardiñas ⁴⁹, P. Gardner ⁶⁷, K. G. Garg ⁸, L. Garrido ⁴⁵, C. Gaspar ⁴⁹, R. E. Geertsema ³⁸, L. L. Gerken ¹⁹, E. Gersabeck ⁶³, M. Gersabeck ²⁰, T. Gershon ⁵⁷, S. Ghizzo ^29,k, Z. Ghorbanimoghaddam ⁵⁵, L. Giambastiani ^33,h, F. I. Giasemis ^16,s, V. Gibson ⁵⁶, H. K. Giemza ⁴², A. L. Gilman ⁶⁴, M. Giovannetti ²⁸, A. Gioventù ⁴⁵, L. Girardey ^63,58, P. Gironella Gironell ⁴⁵, C. Giugliano ^26,g, M. A. Giza ⁴¹, E. L. Gkougkousis ⁶², F. C. Glaser ^14,22, V. V. Gligorov ^16,49, C. Göbel ⁷⁰, E. Golobardes ⁴⁶, D. Golubkov ⁴⁴, A. Golutvin ^62,49,44, S. Gomez Fernandez ⁴⁵, W. Gomulka ⁴⁰, F. Goncalves Abrantes ⁶⁴, M. Goncerz ⁴¹, G. Gong ^4,q, J. A. Gooding ¹⁹, I. V. Gorelov ⁴⁴, C. Gotti ³¹, J. P. Grabowski ¹⁸, L. A. Granado Cardoso ⁴⁹, E. Graugés ⁴⁵, E. Graverini ^50,t, L. Grazette ⁵⁷, G. Graziani ²⁷, A. T. Grecu ⁴³, L. M. Greeven ³⁸, N. A. Grieser ⁶⁶, L. Grillo ⁶⁰, S. Gromov ⁴⁴, C. Gu ¹⁵, M. Guarise ²⁶, L. Guerry ¹¹, M. Guittiere ¹⁴, V. Guliaeva ⁴⁴, P. A. Günther ²², A.-K. Guseinov ⁵⁰, E. Gushchin ⁴⁴, Y. Guz ^6,49,44, T. Gys ⁴⁹, K. Habermann ¹⁸, T. Hadavizadeh ¹, C. Hadjivasiliou ⁶⁷, G. Haefeli ⁵⁰, C. Haen ⁴⁹, M. Hajheidari⁴⁹, G. Hallett ⁵⁷, M. M. Halvorsen ⁴⁹, P. M. Hamilton ⁶⁷, J. Hammerich ⁶¹, Q. Han ⁸, X. Han ^22,49, S. Hansmann-Menzemer ²², L. Hao ⁷, N. Harnew ⁶⁴, T. H. Harris ¹, M. Hartmann ¹⁴, S. Hashmi ⁴⁰, J. 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Saavedra-Arias ⁹, J. J. Saborido Silva ⁴⁷, R. Sadek ¹⁵, N. Sagidova ⁴⁴, D. Sahoo ⁷⁷, N. Sahoo ⁵⁴, B. Saitta ^32,n, M. Salomoni ^31,49,c, I. Sanderswood ⁴⁸, R. Santacesaria ³⁶, C. Santamarina Rios ⁴⁷, M. Santimaria ^28,49, L. Santoro ², E. Santovetti ³⁷, A. Saputi ^26,49, D. Saranin ⁴⁴, A. Sarnatskiy ⁷⁸, G. Sarpis ⁵⁹, M. Sarpis ⁶³, C. Satriano ^36,z, A. Satta ³⁷, M. Saur ⁶, D. Savrina ⁴⁴, H. Sazak ¹⁷, F. Sborzacchi ^49,28, L. G. Scantlebury Smead ⁶⁴, A. Scarabotto ¹⁹, S. Schael ¹⁷, S. Scherl ⁶¹, M. Schiller ⁶⁰, H. Schindler ⁴⁹, M. Schmelling ²¹, B. Schmidt ⁴⁹, S. Schmitt ¹⁷, H. Schmitz¹⁸, O. Schneider ⁵⁰, A. Schopper ⁴⁹, N. Schulte ¹⁹, S. Schulte ⁵⁰, M. H. Schune ¹⁴, R. Schwemmer ⁴⁹, G. Schwering ¹⁷, B. Sciascia ²⁸, A. Sciuccati ⁴⁹, S. Sellam ⁴⁷, A. Semennikov ⁴⁴, T. Senger ⁵¹, M. Senghi Soares ³⁹, A. Sergi ^29,k, N. Serra ⁵¹, L. Sestini ³³, A. Seuthe ¹⁹, Y. Shang ⁶, D. M. Shangase ⁸³, M. Shapkin ⁴⁴, R. S. Sharma ⁶⁹, I. Shchemerov ⁴⁴, L. Shchutska ⁵⁰, T. Shears ⁶¹, L. Shekhtman ⁴⁴, Z. Shen ⁶, S. Sheng ^5,7, V. Shevchenko ⁴⁴, B. Shi ⁷, Q. Shi ⁷, Y. Shimizu ¹⁴, E. Shmanin ²⁵, R. Shorkin ⁴⁴, J. D. Shupperd ⁶⁹, R. Silva Coutinho ⁶⁹, G. Simi ^33,h, S. Simone ^24,p, N. Skidmore ⁵⁷, T. Skwarnicki ⁶⁹, M. W. Slater ⁵⁴, J. C. Smallwood ⁶⁴, E. Smith ⁶⁵, K. Smith ⁶⁸, M. Smith ⁶², A. Snoch ³⁸, L. Soares Lavra ⁵⁹, M. D. Sokoloff ⁶⁶, F. J. P. Soler ⁶⁰, A. Solomin ^44,55, A. Solovev ⁴⁴, I. Solovyev ⁴⁴, N. S. Sommerfeld ¹⁸, R. Song ¹, Y. Song ⁵⁰, Y. Song ^4,q, Y. S. Song ⁶, F. L. Souza De Almeida ⁶⁹, B. Souza De Paula ³, E. Spadaro Norella ^29,k, E. Spedicato ²⁵, J. G. Speer ¹⁹, E. Spiridenkov⁴⁴, P. Spradlin ⁶⁰, V. Sriskaran ⁴⁹, F. Stagni ⁴⁹, M. Stahl ⁴⁹, S. Stahl ⁴⁹, S. Stanislaus ⁶⁴, E. N. Stein ⁴⁹, O. Steinkamp ⁵¹, O. Stenyakin⁴⁴, H. Stevens ¹⁹, D. Strekalina ⁴⁴, Y. Su ⁷, F. Suljik ⁶⁴, J. Sun ³², L. Sun ⁷⁴, D. Sundfeld ², W. Sutcliffe ⁵¹, P. N. Swallow ⁵⁴, K. Swientek ⁴⁰, F. Swystun ⁵⁶, A. Szabelski ⁴², T. Szumlak ⁴⁰, Y. Tan ^4,q, Y. Tang ⁷⁴, M. D. Tat ⁶⁴, A. Terentev ⁴⁴, F. Terzuoli ^35,49,x, F. Teubert ⁴⁹, E. Thomas ⁴⁹, D. J. D. Thompson ⁵⁴, H. Tilquin ⁶², V. Tisserand ¹¹, S. T’Jampens ¹⁰, M. Tobin ^5,49, L. Tomassetti ^26,g, G. Tonani ^30,49,l, X. Tong ⁶, D. Torres Machado ², L. Toscano ¹⁹, D. Y. Tou ^4,q, C. Trippl ⁴⁶, G. Tuci ²², N. Tuning ³⁸, L. H. Uecker ²², A. Ukleja ⁴⁰, D. J. Unverzagt ²², B. Urbach ⁵⁹, E. Ursov ⁴⁴, A. Usachov ³⁹, A. Ustyuzhanin ⁴⁴, U. Uwer ²², V. Vagnoni ²⁵, V. Valcarce Cadenas ⁴⁷, G. Valenti ²⁵, N. Valls Canudas ⁴⁹, H. Van Hecke ⁶⁸, E. van Herwijnen ⁶², C. B. Van Hulse ^47,aa, R. Van Laak ⁵⁰, M. van Veghel ³⁸, G. Vasquez ⁵¹, R. Vazquez Gomez ⁴⁵, P. Vazquez Regueiro ⁴⁷, C. Vázquez Sierra ⁴⁷, S. Vecchi ²⁶, J. J. Velthuis ⁵⁵, M. Veltri ^27,bb, A. Venkateswaran ⁵⁰, M. Verdoglia ³², M. Vesterinen ⁵⁷, D. Vico Benet ⁶⁴, P. Vidrier Villalba ⁴⁵, M. Vieites Diaz ⁴⁹, X. Vilasis-Cardona ⁴⁶, E. Vilella Figueras ⁶¹, A. Villa ²⁵, P. Vincent ¹⁶, F. C. Volle ⁵⁴, D. vom Bruch ¹³, N. Voropaev ⁴⁴, K. Vos ⁷⁹, C. Vrahas ⁵⁹, J. Wagner ¹⁹, J. 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Yuan ⁵, Y Yuan ^5,7, E. Zaffaroni ⁵⁰, M. Zavertyaev ²¹, M. Zdybal ⁴¹, F. Zenesini ^25,j, C. Zeng ^5,7, M. Zeng ^4,q, C. Zhang ⁶, D. Zhang ⁸, J. Zhang ⁷, L. Zhang ^4,q, S. Zhang ⁷¹, S. Zhang ⁶⁴, Y. Zhang ⁶, Y. Z. Zhang ^4,q, Y. Zhao ²², A. Zharkova ⁴⁴, A. Zhelezov ²², S. Z. Zheng ⁶, X. Z. Zheng ^4,q, Y. Zheng ⁷, T. Zhou ⁶, X. Zhou ⁸, Y. Zhou ⁷, V. Zhovkovska ⁵⁷, L. Z. Zhu ⁷, X. Zhu ^4,q, X. Zhu ⁸, V. Zhukov ¹⁷, J. Zhuo ⁴⁸, Q. Zou ^5,7, D. Zuliani ^33,h, and G. Zunica ⁵⁰ (LHCb Collaboration)

¹School of Physics and Astronomy, Monash University, Melbourne, Australia
²Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
³Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
⁴Department of Engineering Physics, Tsinghua University, Beijing, China
⁵Institute of High Energy Physics (IHEP), Beijing, China
⁶School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
⁷University of Chinese Academy of Sciences, Beijing, China
⁸Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
⁹Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica
¹⁰Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
¹¹Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
¹²Université Paris-Saclay, Centre d’Etudes de Saclay (CEA), IRFU, Saclay, France, Gif-Sur-Yvette, France
¹³Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
¹⁴Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
¹⁵Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
¹⁶LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
¹⁷I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
¹⁸Universität Bonn—Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany
¹⁹Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
²⁰Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
²¹Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
²²Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
²³School of Physics, University College Dublin, Dublin, Ireland
²⁴INFN Sezione di Bari, Bari, Italy
²⁵INFN Sezione di Bologna, Bologna, Italy
²⁶INFN Sezione di Ferrara, Ferrara, Italy
²⁷INFN Sezione di Firenze, Firenze, Italy
²⁸INFN Laboratori Nazionali di Frascati, Frascati, Italy
²⁹INFN Sezione di Genova, Genova, Italy
³⁰INFN Sezione di Milano, Milano, Italy
³¹INFN Sezione di Milano-Bicocca, Milano, Italy
³²INFN Sezione di Cagliari, Monserrato, Italy
³³INFN Sezione di Padova, Padova, Italy
³⁴INFN Sezione di Perugia, Perugia, Italy
³⁵INFN Sezione di Pisa, Pisa, Italy
³⁶INFN Sezione di Roma La Sapienza, Roma, Italy
³⁷INFN Sezione di Roma Tor Vergata, Roma, Italy
³⁸Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
³⁹Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
⁴⁰AGH—University of Krakow, Faculty of Physics and Applied Computer Science, Kraków, Poland
⁴¹Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
⁴²National Center for Nuclear Research (NCBJ), Warsaw, Poland
⁴³Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
⁴⁴Authors affiliated with an institute formerly covered by a cooperation agreement with CERN
⁴⁵ICCUB, Universitat de Barcelona, Barcelona, Spain
⁴⁶La Salle, Universitat Ramon Llull, Barcelona, Spain
⁴⁷Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
⁴⁸Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
⁴⁹European Organization for Nuclear Research (CERN), Geneva, Switzerland
⁵⁰Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
⁵¹Physik-Institut, Universität Zürich, Zürich, Switzerland
⁵²NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
⁵³Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
⁵⁴School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
⁵⁵H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
⁵⁶Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
⁵⁷Department of Physics, University of Warwick, Coventry, United Kingdom
⁵⁸STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
⁵⁹School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
⁶⁰School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
⁶¹Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
⁶²Imperial College London, London, United Kingdom
⁶³Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
⁶⁴Department of Physics, University of Oxford, Oxford, United Kingdom
⁶⁵Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
⁶⁶University of Cincinnati, Cincinnati, Ohio, USA
⁶⁷University of Maryland, College Park, Maryland, USA
⁶⁸Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
⁶⁹Syracuse University, Syracuse, New York, USA
⁷⁰Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil)
⁷¹School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁷²Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷³Lanzhou University, Lanzhou, China (associated with Institute Of High Energy Physics (IHEP), Beijing, China)
⁷⁴School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷⁵Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
⁷⁶Ruhr Universitaet Bochum, Fakultaet für Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany)
⁷⁷Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
⁷⁸Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁷⁹Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸⁰Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
⁸¹Universidade da Coruña, A Coruña, Spain (associated with La Salle, Universitat Ramon Llull, Barcelona, Spain)
⁸²Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
⁸³University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)

^*Full author list given at the end of the article.
^aDeceased.
^bAlso at Lamarr Institute for Machine Learning and Artificial Intelligence, Dortmund, Germany.
^cAlso at Università degli Studi di Milano-Bicocca, Milano, Italy.
^dAlso at Università di Roma Tor Vergata, Roma, Italy.
^eAlso at Scuola Normale Superiore, Pisa, Italy.
^fAlso at Università di Modena e Reggio Emilia, Modena, Italy.
^gAlso at Università di Ferrara, Ferrara, Italy.
^hAlso at Università di Padova, Padova, Italy.
ⁱAlso at Universidade Estadual de Campinas (UNICAMP), Campinas, Brazil.
^jAlso at Università di Bologna, Bologna, Italy.
^kAlso at Università di Genova, Genova, Italy.
^lAlso at Università degli Studi di Milano, Milano, Italy.
^mAlso at Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras.
ⁿAlso at Università di Cagliari, Cagliari, Italy.
^oAlso at Centro Federal de Educacão Tecnológica Celso Suckow da Fonseca, Rio De Janeiro, Brazil.
^pAlso at Università di Bari, Bari, Italy.
^qAlso at Center for High Energy Physics, Tsinghua University, Beijing, China.
^rAlso at Università di Perugia, Perugia, Italy.
^sAlso at LIP6, Sorbonne Université, Paris, France.
^tAlso at Università di Pisa, Pisa, Italy.
^uAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
^vAlso at School of Physics and Electronics, Henan University, Kaifeng, China.
^wAlso at Università di Bergamo, Bergamo, Italy.
^xAlso at Università di Siena, Siena, Italy.
^yAlso at Department of Physics/Division of Particle Physics, Lund, Sweden.
^zAlso at Università della Basilicata, Potenza, Italy.
^aaAlso at Universidad de Alcalá, Alcalá de Henares, Spain.
^bbAlso at Università di Urbino, Urbino, Italy.

PDF

Phys. Rev. D 112, 092003 – Published 7 November, 2025

DOI: https://doi.org/10.1103/gcft-fgp1

Abstract

An amplitude analysis of the $Ξ_{c}^{+} \to p K^{-} π^{+}$ decay together with a measurement of the $Ξ_{c}^{+}$ polarization vector in semileptonic beauty-hadron decays is presented. The analysis is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of $9 {fb}^{- 1}$ . An amplitude model is developed and the resonance fractions as well as two- and three-body decay parameters are reported. A sizeable $Ξ_{c}^{+}$ polarization is found. A large sensitivity of the $Ξ_{c}^{+} \to p K^{-} π^{+}$ decay to the polarization is seen, making the amplitude model suitable for $Ξ_{c}^{+}$ polarization measurements in other systems.

Physics Subject Headings (PhySH)

Article Text

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Phys. Rev. D 112, 092003– Published 7 November, 2025

Vol. 112, Iss. 9 — 1 November 2025

Received 6 August 2025
Accepted 7 October 2025

DOI: https://doi.org/10.1103/gcft-fgp1

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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Amplitude analysis of the $Ξ_{c}^{+} \to p K^{-} π^{+}$ decay and $Ξ_{c}^{+}$ baryon polarization measurement in semileptonic beauty-hadron decays

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Amplitude analysis of the Ξc+→pK−π+ decay and Ξc+ baryon polarization measurement in semileptonic beauty-hadron decays

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Amplitude analysis of the $Ξ_{c}^{+} \to p K^{-} π^{+}$ decay and $Ξ_{c}^{+}$ baryon polarization measurement in semileptonic beauty-hadron decays