Observation of enhancement of charmed baryon-to-meson ratio in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
STAR Collaboration,Adam J.,Adamczyk L.,Adams J. R.,Adkins J. K.,Agakishiev G.,Aggarwal M. M.,Ahammed Z.,Alekseev I.,Anderson D. M.,Aparin A.,Aschenauer E. C.,Ashraf M. U.,Atetalla F. G.,Attri A.,Averichev G. S.,Bairathi V.,Barish K.,Behera A.,Bellwied R.,Bhasin A.,Bielcik J.,Bielcikova J.,Bland L. C.,Bordyuzhin I. G.,Brandenburg J. D.,Brandin A. V.,Butterworth J.,Caines H.,Sánchez M. Calderón de la Barca,Cebra D.,Chakaberia I.,Chaloupka P.,Chan B. K.,Chang F-H.,Chang Z.,Chankova-Bunzarova N.,Chatterjee A.,Chen D.,Chen J. H.,Chen X.,Chen Z.,Cheng J.,Cherney M.,Chevalier M.,Choudhury S.,Christie W.,Crawford H. J.,Csanád M.,Daugherity M.,Dedovich T. G.,Deppner I. M.,Derevschikov A. A.,Didenko L.,Dong X.,Drachenberg J. L.,Dunlop J. C.,Edmonds T.,Elsey N.,Engelage J.,Eppley G.,Esha R.,Esumi S.,Evdokimov O.,Ewigleben J.,Eyser O.,Fatemi R.,Fazio S.,Federic P.,Fedorisin J.,Feng C. J.,Feng Y.,Filip P.,Finch E.,Fisyak Y.,Francisco A.,Fulek L.,Gagliardi C. A.,Galatyuk T.,Geurts F.,Gibson A.,Gopal K.,Grosnick D.,Guryn W.,Hamad A. I.,Hamed A.,Harris J. W.,He W.,He X.,Heppelmann S.,Herrmann N.,Hoffman E.,Holub L.,Hong Y.,Horvat S.,Hu Y.,Huang H. Z.,Huang S. L.,Huang T.,Huang X.,Humanic T. J.,Huo P.,Igo G.,Isenhower D.,Jacobs W. W.,Jena C.,Jentsch A.,JI Y.,Jia J.,Jiang K.,Jowzaee S.,Ju X.,Judd E. G.,Kabana S.,Kabir M. L.,Kagamaster S.,Kalinkin D.,Kang K.,Kapukchyan D.,Kauder K.,Ke H. W.,Keane D.,Kechechyan A.,Kelsey M.,Khyzhniak Y. V.,Kikoła D. P.,Kim C.,Kimelman B.,Kincses D.,Kinghorn T. A.,Kisel I.,Kiselev A.,Kisiel A.,Kocan M.,Kochenda L.,Kosarzewski L. K.,Kramarik L.,Kravtsov P.,Krueger K.,Mudiyanselage N. Kulathunga,Kumar L.,Elayavalli R. Kunnawalkam,Kwasizur J. H.,Lacey R.,Lan S.,Landgraf J. M.,Lauret J.,Lebedev A.,Lednicky R.,Lee J. H.,Leung Y. H.,Li C.,Li W.,Li X.,Li Y.,Liang Y.,Licenik R.,Lin T.,Lin Y.,Lisa M. A.,Liu F.,Liu H.,Liu P.,Liu T.,Liu X.,Liu Y.,Liu Z.,Ljubicic T.,Llope W. J.,Longacre R. S.,Lukow N. S.,Luo S.,Luo X.,Ma G. L.,Ma L.,Ma R.,Ma Y. G.,Magdy N.,Majka R.,Mallick D.,Margetis S.,Markert C.,Matis H. S.,Mazer J. A.,Minaev N. G.,Mioduszewski S.,Mohanty B.,Mooney I.,Moravcova Z.,Morozov D. A.,Nagy M.,Nam J. D.,Nasim Md.,Nayak K.,Neff D.,Nelson J. M.,Nemes D. B.,Nie M.,Nigmatkulov G.,Niida T.,Nogach L. V.,Nonaka T.,Odyniec G.,Ogawa A.,Oh S.,Okorokov V. A.,Page B. S.,Pak R.,Pandav A.,Panebratsev Y.,Pawlik B.,Pawlowska D.,Pei H.,Perkins C.,Pinsky L.,Pintér R. L.,Pluta J.,Porter J.,Posik M.,Pruthi N. K.,Przybycien M.,Putschke J.,Qiu H.,Quintero A.,Radhakrishnan S. K.,Ramachandran S.,Ray R. L.,Reed R.,Ritter H. G.,Roberts J. B.,Rogachevskiy O. V.,Romero J. L.,Ruan L.,Rusnak J.,Sahoo N. R.,Sako H.,Salur S.,Sandweiss J.,Sato S.,Schmidke W. B.,Schmitz N.,Schweid B. R.,Seck F.,Seger J.,Sergeeva M.,Seto R.,Seyboth P.,Shah N.,Shahaliev E.,Shanmuganathan P. V.,Shao M.,Shen F.,Shen W. Q.,Shi S. S.,Shou Q. Y.,Sichtermann E. P.,Sikora R.,Simko M.,Singh J.,Singha S.,Smirnov N.,Solyst W.,Sorensen P.,Spinka H. M.,Srivastava B.,Stanislaus T. D. S.,Stefaniak M.,Stewart D. J.,Strikhanov M.,Stringfellow B.,Suaide A. A. P.,Sumbera M.,Summa B.,Sun X. M.,Sun Y.,Surrow B.,Svirida D. N.,Szymanski P.,Tang A. H.,Tang Z.,Taranenko A.,Tarnowsky T.,Thomas J. H.,Timmins A. R.,Tlusty D.,Tokarev M.,Tomkiel C. A.,Trentalange S.,Tribble R. E.,Tribedy P.,Tripathy S. K.,Tsai O. D.,Tu Z.,Ullrich T.,Underwood D. G.,Upsal I.,Van Buren G.,Vanek J.,Vasiliev A. N.,Vassiliev I.,Videbæk F.,Vokal S.,Voloshin S. A.,Wang F.,Wang G.,Wang J. S.,Wang P.,Wang Y.,Wang Z.,Webb J. C.,Weidenkaff P. C.,Wen L.,Westfall G. D.,Wieman H.,Wissink S. W.,Witt R.,Wu Y.,Xiao Z. G.,Xie G.,Xie W.,Xu H.,Xu N.,Xu Q. H.,Xu Y. F.,Xu Y.,Xu Z.,Yang C.,Yang Q.,Yang S.,Yang Y.,Yang Z.,Ye Z.,Yi L.,Yip K.,Zbroszczyk H.,Zha W.,Zhang D.,Zhang S.,Zhang X. P.,Zhang Y.,Zhang Z. J.,Zhang Z.,Zhao J.,Zhong C.,Zhou C.,Zhu X.,Zhu Z.,Zurek M.,Zyzak M.
arxiv（2019）
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摘要
We report on the first measurement of the charmed baryon $\Lambda_c^{\pm}$ production at midrapidity ($|y|$ $<$ 1) in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV collected by the STAR experiment at the Relativistic Heavy Ion Collider. The $\Lambda_c$/$D^0$ (denoting ($\Lambda_c^++\Lambda_c^-$)/($D^0+\bar{D^0}$)) yield ratio is measured to be 1.08 $\pm$ 0.16 (stat.) $\pm$ 0.26 (sys.) in the 0--20% most central Au+Au collisions for the transverse momentum ($p_T$) range 3 $<$ $p_T$ $<$ 6 GeV/$c$. This is significantly larger than the PYTHIA model calculations for $p+p$ collisions. The measured $\Lambda_c$/$D^0$ ratio, as a function of $p_T$ and collision centrality, is comparable to the baryon-to-meson ratios for light and strange hadrons in Au+Au collisions. Model calculations including coalescence hadronization for charmed baryon and meson formation reproduce the features of our measured $\Lambda_c$/$D^0$ ratio.
