Letter
Open Access

Observation of strangeness enhancement with charmed mesons in high-multiplicity $p Pb$ collisions at $\sqrt{s_{NN}} = 8.16 TeV$

R. Aaij ³⁵, A. S. W. Abdelmotteleb ⁵⁴, C. Abellan Beteta⁴⁸, F. Abudinén ⁵⁴, T. Ackernley ⁵⁸, B. Adeva ⁴⁴, M. Adinolfi ⁵², P. Adlarson ⁷⁸, H. Afsharnia¹¹ et al. (LHCb Collaboration)

H. Afsharnia¹¹, C. Agapopoulou ⁴⁶, C. A. Aidala ⁷⁹, Z. Ajaltouni¹¹, S. Akar ⁶³, K. Akiba ³⁵, P. Albicocco ²⁵, J. Albrecht ¹⁷, F. Alessio ⁴⁶, M. Alexander ⁵⁷, A. Alfonso Albero ⁴³, Z. Aliouche ⁶⁰, P. Alvarez Cartelle ⁵³, R. Amalric ¹⁵, S. Amato ³, J. L. Amey ⁵², Y. Amhis ^13,46, L. An ⁶, L. Anderlini ²⁴, M. Andersson ⁴⁸, A. Andreianov ⁴¹, P. Andreola ⁴⁸, M. Andreotti ²³, D. Andreou ⁶⁶, D. Ao ⁷, F. Archilli ^34,b, S. Arguedas Cuendis ⁹, A. Artamonov ⁴¹, M. Artuso ⁶⁶, E. Aslanides ¹², M. Atzeni ⁶², B. Audurier ¹⁴, D. Bacher ⁶¹, I. Bachiller Perea ¹⁰, S. Bachmann ¹⁹, M. Bachmayer ⁴⁷, J. J. Back ⁵⁴, A. Bailly-reyre¹⁵, P. Baladron Rodriguez ⁴⁴, V. Balagura ¹⁴, W. Baldini ^23,46, J. Baptista de Souza Leite ², M. Barbetti ^24,c, I. R. Barbosa ⁶⁷, R. J. Barlow ⁶⁰, S. Barsuk ¹³, W. Barter ⁵⁶, M. Bartolini ⁵³, F. Baryshnikov ⁴¹, J. M. Basels ¹⁶, G. Bassi ^32,d, B. Batsukh ⁵, A. Battig ¹⁷, A. Bay ⁴⁷, A. Beck ⁵⁴, M. Becker ¹⁷, F. Bedeschi ³², I. B. Bediaga ², A. Beiter⁶⁶, S. Belin ⁴⁴, V. Bellee ⁴⁸, K. Belous ⁴¹, I. Belov ²⁶, I. Belyaev ⁴¹, G. Benane ¹², G. Bencivenni ²⁵, E. Ben-Haim ¹⁵, A. Berezhnoy ⁴¹, R. Bernet ⁴⁸, S. Bernet Andres ⁴², D. Berninghoff¹⁹, H. C. Bernstein⁶⁶, C. Bertella ⁶⁰, A. Bertolin ³⁰, C. Betancourt ⁴⁸, F. Betti ⁵⁶, J. Bex ⁵³, Ia. Bezshyiko ⁴⁸, J. Bhom ³⁸, L. Bian ⁷¹, M. S. Bieker ¹⁷, N. V. Biesuz ²³, P. Billoir ¹⁵, A. Biolchini ³⁵, M. Birch ⁵⁹, F. C. R. Bishop ⁵³, A. Bitadze ⁶⁰, A. Bizzeti , M. P. Blago ⁵³, T. Blake ⁵⁴, F. Blanc ⁴⁷, J. E. Blank ¹⁷, S. Blusk ⁶⁶, D. Bobulska ⁵⁷, V. Bocharnikov ⁴¹, J. A. Boelhauve ¹⁷, O. Boente Garcia ¹⁴, T. Boettcher ⁶³, A. Bohare ⁵⁶, A. Boldyrev ⁴¹, C. S. Bolognani ⁷⁶, R. Bolzonella ^23,e, N. Bondar ⁴¹, F. Borgato ^30,46, S. Borghi ⁶⁰, M. Borsato ^28,f, J. T. Borsuk ³⁸, S. A. Bouchiba ⁴⁷, T. J. V. Bowcock ⁵⁸, A. Boyer ⁴⁶, C. Bozzi ²³, M. J. Bradley⁵⁹, S. Braun ⁶⁴, A. Brea Rodriguez ⁴⁴, N. Breer ¹⁷, J. Brodzicka ³⁸, A. Brossa Gonzalo ⁴⁴, J. Brown ⁵⁸, D. Brundu ²⁹, A. Buonaura ⁴⁸, L. Buonincontri ³⁰, A. T. Burke ⁶⁰, C. Burr ⁴⁶, A. Bursche⁶⁹, A. Butkevich ⁴¹, J. S. Butter ⁵³, J. Buytaert ⁴⁶, W. Byczynski ⁴⁶, S. Cadeddu ²⁹, H. Cai⁷¹, R. Calabrese ^23,e, L. Calefice ¹⁷, S. Cali ²⁵, M. Calvi ^28,f, M. Calvo Gomez ⁴², J. Cambon Bouzas ⁴⁴, P. Campana ²⁵, D. H. Campora Perez ⁷⁶, A. F. Campoverde Quezada ⁷, S. Capelli ^28,f, L. Capriotti ²³, A. Carbone ^22,g, L. Carcedo Salgado ⁴⁴, R. Cardinale ^26,h, A. Cardini ²⁹, P. Carniti ^28,f, L. Carus¹⁹, A. Casais Vidal ⁴⁴, R. Caspary ¹⁹, G. Casse ⁵⁸, J. Castro Godinez ⁹, M. Cattaneo ⁴⁶, G. Cavallero ²³, V. Cavallini ^23,e, S. Celani ⁴⁷, J. Cerasoli ¹², D. Cervenkov ⁶¹, S. Cesare ^27,i, A. J. Chadwick ⁵⁸, I. Chahrour ⁷⁹, M. G. Chapman⁵², M. Charles ¹⁵, Ph. Charpentier ⁴⁶, C. A. Chavez Barajas ⁵⁸, M. Chefdeville ¹⁰, C. Chen ¹², S. Chen ⁵, A. Chernov ³⁸, S. Chernyshenko ⁵⁰, V. Chobanova ^44,j, S. Cholak ⁴⁷, M. Chrzaszcz ³⁸, A. Chubykin ⁴¹, V. Chulikov ⁴¹, P. Ciambrone ²⁵, M. F. Cicala ⁵⁴, X. Cid Vidal ⁴⁴, G. Ciezarek ⁴⁶, P. Cifra ⁴⁶, P. E. L. Clarke ⁵⁶, M. Clemencic ⁴⁶, H. V. Cliff ⁵³, J. Closier ⁴⁶, J. L. Cobbledick ⁶⁰, C. Cocha Toapaxi ¹⁹, V. Coco ⁴⁶, J. Cogan ¹², E. Cogneras ¹¹, L. Cojocariu ⁴⁰, P. Collins ⁴⁶, T. Colombo ⁴⁶, A. Comerma-Montells ⁴³, L. Congedo ²¹, A. Contu ²⁹, N. Cooke ⁵⁷, I. Corredoira ⁴⁴, A. Correia ¹⁵, G. Corti ⁴⁶, J. J. Cottee Meldrum⁵², B. Couturier ⁴⁶, D. C. Craik ⁴⁸, M. Cruz Torres ^2,k, R. Currie ⁵⁶, C. L. Da Silva ⁶⁵, S. Dadabaev ⁴¹, L. Dai ⁶⁸, X. Dai ⁶, E. Dall’Occo ¹⁷, J. Dalseno ⁴⁴, C. D’Ambrosio ⁴⁶, J. Daniel ¹¹, A. Danilina ⁴¹, P. d’Argent ²¹, A. Davidson ⁵⁴, J. E. Davies ⁶⁰, A. Davis ⁶⁰, O. De Aguiar Francisco ⁶⁰, C. De Angelis^29,l, J. de Boer ³⁵, K. De Bruyn ⁷⁵, S. De Capua ⁶⁰, M. De Cian ¹⁹, U. De Freitas Carneiro Da Graca ^2,m, E. De Lucia ²⁵, J. M. De Miranda ², L. De Paula ³, M. De Serio ^21,n, D. De Simone ⁴⁸, P. De Simone ²⁵, F. De Vellis ¹⁷, J. A. de Vries ⁷⁶, F. Debernardis ^21,n, D. Decamp ¹⁰, V. Dedu ¹², L. Del Buono ¹⁵, B. Delaney ⁶², H.-P. Dembinski ¹⁷, J. Deng ⁸, V. Denysenko ⁴⁸, O. Deschamps ¹¹, F. Dettori ^29,l, B. Dey ⁷⁴, P. Di Nezza ²⁵, I. Diachkov ⁴¹, S. Didenko ⁴¹, S. Ding ⁶⁶, V. Dobishuk ⁵⁰, A. D. Docheva ⁵⁷, A. Dolmatov⁴¹, C. Dong ⁴, A. M. Donohoe ²⁰, F. Dordei ²⁹, A. C. dos Reis ², L. Douglas⁵⁷, A. G. Downes ¹⁰, W. Duan ⁶⁹, P. Duda ⁷⁷, M. W. Dudek ³⁸, L. Dufour ⁴⁶, V. Duk ³¹, P. Durante ⁴⁶, M. M. Duras ⁷⁷, J. M. Durham ⁶⁵, D. Dutta ⁶⁰, A. Dziurda ³⁸, A. Dzyuba ⁴¹, S. Easo ^55,46, E. Eckstein⁷³, U. Egede ¹, A. Egorychev ⁴¹, V. Egorychev ⁴¹, C. Eirea Orro⁴⁴, S. Eisenhardt ⁵⁶, E. Ejopu ⁶⁰, S. Ek-In ⁴⁷, L. Eklund ⁷⁸, M. Elashri ⁶³, J. Ellbracht ¹⁷, S. Ely ⁵⁹, A. Ene ⁴⁰, E. Epple ⁶³, S. Escher ¹⁶, J. Eschle ⁴⁸, S. Esen ⁴⁸, T. Evans ⁶⁰, F. Fabiano ^29,46,l, L. N. Falcao ², Y. Fan ⁷, B. Fang ^71,13, L. Fantini ^31,o, M. Faria ⁴⁷, K. Farmer ⁵⁶, D. Fazzini ^28,f, L. Felkowski ⁷⁷, M. Feng ^5,7, M. Feo ⁴⁶, M. Fernandez Gomez ⁴⁴, A. D. Fernez ⁶⁴, F. Ferrari ²², F. Ferreira Rodrigues ³, S. Ferreres Sole ³⁵, M. Ferrillo ⁴⁸, M. Ferro-Luzzi ⁴⁶, S. Filippov ⁴¹, R. A. Fini ²¹, M. Fiorini ^23,e, M. Firlej ³⁷, K. M. Fischer ⁶¹, D. S. Fitzgerald ⁷⁹, C. Fitzpatrick ⁶⁰, T. Fiutowski ³⁷, F. Fleuret ¹⁴, M. Fontana ²², F. Fontanelli ^26,h, L. F. Foreman ⁶⁰, R. Forty ⁴⁶, D. Foulds-Holt ⁵³, M. Franco Sevilla ⁶⁴, M. Frank ⁴⁶, E. Franzoso ^23,e, G. Frau ¹⁹, C. Frei ⁴⁶, D. A. Friday ⁶⁰, L. Frontini ^27,i, J. Fu ⁷, Q. Fuehring ¹⁷, Y. Fujii ¹, T. Fulghesu ¹⁵, E. Gabriel ³⁵, G. Galati ^21,n, M. D. Galati ³⁵, A. Gallas Torreira ⁴⁴, D. Galli ^22,g, S. Gambetta ^56,46, M. Gandelman ³, P. Gandini ²⁷, H. Gao ⁷, R. Gao ⁶¹, Y. Gao ⁸, Y. Gao ⁶, Y. Gao⁸, M. Garau ^29,l, L. M. Garcia Martin ⁴⁷, P. Garcia Moreno ⁴³, J. García Pardiñas ⁴⁶, B. Garcia Plana⁴⁴, F. A. Garcia Rosales ¹⁴, L. Garrido ⁴³, C. Gaspar ⁴⁶, R. E. Geertsema ³⁵, L. L. Gerken ¹⁷, E. Gersabeck ⁶⁰, M. Gersabeck ⁶⁰, T. Gershon ⁵⁴, Z. Ghorbanimoghaddam⁵², L. Giambastiani ³⁰, F. I. Giasemis ^15,p, V. Gibson ⁵³, H. K. Giemza ³⁹, A. L. Gilman ⁶¹, M. Giovannetti ²⁵, A. Gioventù ⁴³, P. Gironella Gironell ⁴³, C. Giugliano ^23,e, M. A. Giza ³⁸, K. Gizdov ⁵⁶, E. L. Gkougkousis ⁵⁹, F. C. Glaser ^13,19, V. V. Gligorov ¹⁵, C. Göbel ⁶⁷, E. Golobardes ⁴², D. Golubkov ⁴¹, A. Golutvin ^59,41,46, A. Gomes ^2,a,q, S. Gomez Fernandez ⁴³, F. Goncalves Abrantes ⁶¹, M. Goncerz ³⁸, G. Gong ⁴, J. A. Gooding ¹⁷, I. V. Gorelov ⁴¹, C. Gotti ²⁸, J. P. Grabowski ⁷³, L. A. Granado Cardoso ⁴⁶, E. Graugés ⁴³, E. Graverini ⁴⁷, L. Grazette ⁵⁴, G. Graziani , A. T. Grecu ⁴⁰, L. M. Greeven ³⁵, N. A. Grieser ⁶³, L. Grillo ⁵⁷, S. Gromov ⁴¹, C. Gu ¹⁴, M. Guarise ²³, M. Guittiere ¹³, V. Guliaeva ⁴¹, P. A. Günther ¹⁹, A.-K. Guseinov ⁴¹, E. Gushchin ⁴¹, Y. Guz ^6,41,46, T. Gys ⁴⁶, T. Hadavizadeh ¹, C. Hadjivasiliou ⁶⁴, G. Haefeli ⁴⁷, C. Haen ⁴⁶, J. Haimberger ⁴⁶, S. C. Haines ⁵³, M. Hajheidari⁴⁶, T. Halewood-leagas ⁵⁸, M. M. Halvorsen ⁴⁶, P. M. Hamilton ⁶⁴, J. Hammerich ⁵⁸, Q. Han ⁸, X. Han ¹⁹, S. Hansmann-Menzemer ¹⁹, L. Hao ⁷, N. Harnew ⁶¹, T. Harrison ⁵⁸, M. Hartmann ¹³, C. Hasse ⁴⁶, J. He ^7,r, K. 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Schmidt ⁴⁶, S. Schmitt ¹⁶, H. Schmitz⁷³, O. Schneider ⁴⁷, A. Schopper ⁴⁶, N. Schulte ¹⁷, S. Schulte ⁴⁷, M. H. Schune ¹³, R. Schwemmer ⁴⁶, G. Schwering ¹⁶, B. Sciascia ²⁵, A. Sciuccati ⁴⁶, S. Sellam ⁴⁴, A. Semennikov ⁴¹, M. Senghi Soares ³⁶, A. Sergi ^26,h, N. Serra ^48,46, L. Sestini ³⁰, A. Seuthe ¹⁷, Y. Shang ⁶, D. M. Shangase ⁷⁹, M. Shapkin ⁴¹, I. Shchemerov ⁴¹, L. Shchutska ⁴⁷, T. Shears ⁵⁸, L. Shekhtman ⁴¹, Z. Shen ⁶, S. Sheng ^5,7, V. Shevchenko ⁴¹, B. Shi ⁷, E. B. Shields ^28,f, Y. Shimizu ¹³, E. Shmanin ⁴¹, R. Shorkin ⁴¹, J. D. Shupperd ⁶⁶, R. Silva Coutinho ⁶⁶, G. Simi ³⁰, S. Simone ^21,n, M. Singla ¹, N. Skidmore ⁶⁰, R. Skuza ¹⁹, T. Skwarnicki ⁶⁶, M. W. Slater ⁵¹, J. C. Smallwood ⁶¹, J. G. Smeaton ⁵³, E. Smith ⁶², K. Smith ⁶⁵, M. Smith ⁵⁹, A. Snoch ³⁵, L. Soares Lavra ⁵⁶, M. D. Sokoloff ⁶³, F. J. P. Soler ⁵⁷, A. Solomin ^41,52, A. Solovev ⁴¹, I. Solovyev ⁴¹, R. Song ¹, Y. Song ⁴⁷, Y. Song ⁴, Y. S. Song ⁶, F. L. Souza De Almeida ³, B. Souza De Paula ³, E. 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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
⁴Center for High Energy 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
¹²Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France
¹³Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
¹⁴Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
¹⁵LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
¹⁶I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
¹⁷Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
¹⁸Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
¹⁹Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
²⁰School of Physics, University College Dublin, Dublin, Ireland
²¹INFN Sezione di Bari, Bari, Italy
²²INFN Sezione di Bologna, Bologna, Italy
²³INFN Sezione di Ferrara, Ferrara, Italy
²⁴INFN Sezione di Firenze, Firenze, Italy
²⁵INFN Laboratori Nazionali di Frascati, Frascati, Italy
²⁶INFN Sezione di Genova, Genova, Italy
²⁷INFN Sezione di Milano, Milano, Italy
²⁸INFN Sezione di Milano-Bicocca, Milano, Italy
²⁹INFN Sezione di Cagliari, Monserrato, Italy
³⁰Università degli Studi di Padova, Università e INFN, Padova, Padova, Italy
³¹INFN Sezione di Perugia, Perugia, Italy
³²INFN Sezione di Pisa, Pisa, Italy
³³INFN Sezione di Roma La Sapienza, Roma, Italy
³⁴INFN Sezione di Roma Tor Vergata, Roma, Italy
³⁵Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
³⁶Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
³⁷AGH—University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland
³⁸Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
³⁹National Center for Nuclear Research (NCBJ), Warsaw, Poland
⁴⁰Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
⁴¹Affiliated with an institute covered by a cooperation agreement with CERN
⁴²DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain
⁴³ICCUB, Universitat de Barcelona, Barcelona, Spain
⁴⁴Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
⁴⁵Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
⁴⁶European Organization for Nuclear Research (CERN), Geneva, Switzerland
⁴⁷Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
⁴⁸Physik-Institut, Universität Zürich, Zürich, Switzerland
⁴⁹NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
⁵⁰Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
⁵¹University of Birmingham, Birmingham, United Kingdom
⁵²H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
⁵³Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
⁵⁴Department of Physics, University of Warwick, Coventry, United Kingdom
⁵⁵STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
⁵⁶School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
⁵⁷School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
⁵⁸Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
⁵⁹Imperial College London, London, United Kingdom
⁶⁰Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
⁶¹Department of Physics, University of Oxford, Oxford, United Kingdom
⁶²Massachusetts Institute of Technology, Cambridge, MA, United States
⁶³University of Cincinnati, Cincinnati, OH, United States
⁶⁴University of Maryland, College Park, MD, United States
⁶⁵Los Alamos National Laboratory (LANL), Los Alamos, NM, United States
⁶⁶Syracuse University, Syracuse, NY, United States
⁶⁷Pontifícia 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)
⁶⁸School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁶⁹Guangdong 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 Center for High Energy Physics, Tsinghua University, Beijing, China)
⁷⁰Lanzhou University, Lanzhou, China (associated with Institute Of High Energy Physics (IHEP), Beijing, China)
⁷¹School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China)
⁷²Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
⁷³Universität Bonn—Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany)
⁷⁴Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
⁷⁵Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁷⁶Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁷⁷Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
⁷⁸Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
⁷⁹University of Michigan, Ann Arbor, MI, United States (associated with Syracuse University, Syracuse, NY, United States)
⁸⁰Departement de Physique Nucleaire (SPhN), Gif-Sur-Yvette, France

^*Full author list given at the end of the article.
^aDeceased.
^bAlso at Università di Roma Tor Vergata, Roma, Italy.
^cAlso at Università di Firenze, Firenze, Italy.
^dAlso at Scuola Normale Superiore, Pisa, Italy.
^eAlso at Università di Ferrara, Ferrara, Italy.
^fAlso at Università di Milano Bicocca, Milano, Italy.
^gAlso at Università di Bologna, Bologna, Italy.
^hAlso at Università di Genova, Genova, Italy.
ⁱAlso at Università degli Studi di Milano, Milano, Italy.
^jAlso at Universidade da Coruña, Coruña, Spain.
^kAlso at Universidad Nacional Autónoma de Honduras, Tegucigalpa, Honduras.
^lAlso at Università di Cagliari, Cagliari, Italy.
^mAlso at Centro Federal de Educacão Tecnológica Celso Suckow da Fonseca, Rio De Janeiro, Brazil.
ⁿAlso at Università di Bari, Bari, Italy.
^oAlso at Università di Perugia, Perugia, Italy.
^pAlso at LIP6, Sorbonne Universite, Paris, France.
^qAlso at Universidade de Brasília, Brasília, Brazil.
^rAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
^sAlso at Università di Pisa, Pisa, Italy.
^tAlso at Central South U., Changsha, China.
^uAlso at Università di Padova, Padova, Italy.
^vAlso at Excellence Cluster ORIGINS, Munich, Germany.
^wAlso at Department of Physics/Division of Particle Physics, Lund, Sweden.
^xAlso at Università della Basilicata, Potenza, Italy.
^yAlso at Università di Siena, Siena, Italy.
^zAlso at Universidad de Alcalá, Alcalá de Henares, Spain.
^aaAlso at Università di Urbino, Urbino, Italy.

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Phys. Rev. D 110, L031105 – Published 22 August, 2024

DOI: https://doi.org/10.1103/PhysRevD.110.L031105

Abstract

The production of prompt $D_{s}^{+}$ and $D^{+}$ mesons is measured by the LHCb experiment in proton-lead ( $p Pb$ ) collisions in both the forward ( $1.5 < y^{*} < 4.0$ ) and backward ( $- 5.0 < y^{*} < - 2.5$ ) rapidity regions at a nucleon-nucleon center-of-mass energy of $\sqrt{s_{NN}} = 8.16 TeV$ . The nuclear modification factors of both $D_{s}^{+}$ and $D^{+}$ mesons are determined as a function of transverse momentum, $p_{T}$ , and rapidity. In addition, the $D_{s}^{+}$ to $D^{+}$ cross section ratio is measured as a function of the primary charged particle multiplicity in the event. An enhanced $D_{s}^{+}$ to $D^{+}$ production in high-multiplicity events is observed for the whole measured $p_{T}$ range, in particular at low $p_{T}$ and backward rapidity, where the significance exceeds six standard deviations. This constitutes the first observation of strangeness enhancement in charm quark hadronization in high-multiplicity $p Pb$ collisions. The results are also qualitatively consistent with the presence of quark coalescence as an additional charm quark hadronization mechanism in high-multiplicity proton-lead collisions.

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Article Text

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Phys. Rev. D 110, L031105– Published 22 August, 2024

Vol. 110, Iss. 3 — 1 August 2024

Received 16 November 2023
Accepted 8 July 2024

DOI: https://doi.org/10.1103/PhysRevD.110.L031105

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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Observation of strangeness enhancement with charmed mesons in high-multiplicity $p Pb$ collisions at $\sqrt{s_{NN}} = 8.16 TeV$

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Observation of strangeness enhancement with charmed mesons in high-multiplicity pPb collisions at sNN=8.16 TeV

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Observation of strangeness enhancement with charmed mesons in high-multiplicity $p Pb$ collisions at $\sqrt{s_{NN}} = 8.16 TeV$