Acharya S, Adamová D, Adler A, Adolfsson J, Aggarwal M M, Aglieri Rinella G, Agnello M, Agrawal N, Ahammed Z, Ahmad S, Ahn S U, Akindinov A, Al-Turany M, Alam S N, Albuquerque D S D, Aleksandrov D, Alessandro B, Alfanda H M, Alfaro Molina R, Ali B, Ali Y, Alici A, Alkin A, Alme J, Alt T, Altenkamper L, Altsybeev I, Anaam M N, Andrei C, Andreou D, Andrews H A, Andronic A, Angeletti M, Anguelov V, Anson C, Antičić T, Antinori F, Antonioli P, Anwar R, Apadula N, Aphecetche L, Appelshäuser H, Arcelli S, Arnaldi R, Arratia M, Arsene I C, Arslandok M, Augustinus A, Averbeck R, Aziz S, Azmi M D, Badalà A, Baek Y W, Bagnasco S, Bai X, Bailhache R, Bala R, Baldisseri A, Ball M, Balouza S, Barbera R, Barioglio L, Barnaföldi G G, Barnby L S, Barret V, Bartalini P, Barth K, Bartsch E, Baruffaldi F, Bastid N, Basu S, Batigne G, Batyunya B, Bauri D, Bazo Alba J L, Bearden I G, Bedda C, Behera N K, Belikov I, Bell Hechavarria A D C, Bellini F, Bellwied R, Belyaev V, Bencedi G, Beole S, Bercuci A, Berdnikov Y, Berenyi D, Bertens R A, Berzano D, Besoiu M G, Betev L, Bhasin A, Bhat I R, Bhat M A, Bhatt H, Bhattacharjee B, Bianchi A, Bianchi L, Bianchi N, Bielčík J, Bielčíková J, Bilandzic A, Biro G, Biswas R, Biswas S, Blair J T, Blau D, Blume C, Boca G, Bock F, Bogdanov A, Boi S, Boldizsár L, Bolozdynya A, Bombara M, Bonomi G, Borel H, Borissov A, Bossi H, Botta E, Bratrud L, Braun-Munzinger P, Bregant M, Broz M, Brucken E J, Bruna E, Bruno G E, Buckland M D, Budnikov D, Buesching H, Bufalino S, Bugnon O, Buhler P, Buncic P, Buthelezi Z, Butt J B, Buxton J T, Bysiak S A, Caffarri D, Caliva A, Calvo Villar E, Camacho R S, Camerini P, Capon A A, Carnesecchi F, Caron R, Castillo Castellanos J, Castro A J, Casula E A R, Catalano F, Ceballos Sanchez C, Chakraborty P, Chandra S, Chang W, Chapeland S, Chartier M, Chattopadhyay S, Chattopadhyay S, Chauvin A, Cheshkov C, Cheynis B, Chibante Barroso V, Chinellato D D, Cho S, Chochula P, Chowdhury T, Christakoglou P, Christensen C H, Christiansen P, Chujo T, Cicalo C, Cifarelli L, Cindolo F, Cleymans J, Colamaria F, Colella D, Collu A, Colocci M, Concas M, Conesa Balbastre G, Conesa Del Valle Z, Contin G, Contreras J G, Cormier T M, Corrales Morales Y, Cortese P, Cosentino M R, Costa F, Costanza S, Crochet P, Cuautle E, Cui P, Cunqueiro L, Dabrowski D, Dahms T, Dainese A, Damas F P A, Danisch M C, Danu A, Das D, Das I, Das P, Das P, Das S, Dash A, Dash S, De S, De Caro A, de Cataldo G, de Cuveland J, De Falco A, De Gruttola D, De Marco N, De Pasquale S, Deb S, Debjani B, Degenhardt H F, Deja K R, Deloff A, Delsanto S, Devetak D, Dhankher P, Di Bari D, Di Mauro A, Diaz R A, Dietel T, Dillenseger P, Ding Y, Divià R, Dixit D U, Djuvsland Ø, Dmitrieva U, Dobrin A, Dönigus B, Dordic O, Dubey A K, Dubla A, Dudi S, Dukhishyam M, Dupieux P, Ehlers R J, Eikeland V N, Elia D, Engel H, Epple E, Erazmus B, Erhardt F, Erokhin A, Ersdal M R, Espagnon B, Eulisse G, Evans D, Evdokimov S, Fabbietti L, Faggin M, Faivre J, Fan F, Fantoni A, Fasel M, Fecchio P, Feliciello A, Feofilov G, Fernández Téllez A, Ferrero A, Ferretti A, Festanti A, Feuillard V J G, Figiel J, Filchagin S, Finogeev D, Fionda F M, Fiorenza G, Flor F, Foertsch S, Foka P, Fokin S, Fragiacomo E, Frankenfeld U, Fuchs U, Furget C, Furs A, Fusco Girard M, Gaardhøje J J, Gagliardi M, Gago A M, Gal A, Galvan C D, Ganoti P, Garabatos C, Garcia-Solis E, Garg K, Gargiulo C, Garibli A, Garner K, Gasik P, Gauger E F, Gay Ducati M B, Germain M, Ghosh J, Ghosh P, Ghosh S K, Gianotti P, Giubellino P, Giubilato P, Glässel P, Goméz Coral D M, Gomez Ramirez A, Gonzalez V, González-Zamora P, Gorbunov S, Görlich L, Gotovac S, Grabski V, Graczykowski L K, Graham K L, Greiner L, Grelli A, Grigoras C, Grigoriev V, Grigoryan A, Grigoryan S, Groettvik O S, Grosa F, Grosse-Oetringhaus J F, Grosso R, Guernane R, Guittiere M, Gulbrandsen K, Gunji T, Gupta A, Gupta R, Guzman I B, Haake R, Habib M K, Hadjidakis C, Hamagaki H, Hamar G, Hamid M, Hannigan R, Haque M R, Harlenderova A, Harris J W, Harton A, Hasenbichler J A, Hassan H, Hatzifotiadou D, Hauer P, Hayashi S, Heckel S T, Hellbär E, Helstrup H, Herghelegiu A, Herman T, Hernandez E G, Herrera Corral G, Herrmann F, Hetland K F, Hilden T E, Hillemanns H, Hills C, Hippolyte B, Hohlweger B, Horak D, Hornung A, Hornung S, Hosokawa R, Hristov P, Huang C, Hughes C, Huhn P, Humanic T J, Hushnud H, Husova L A, Hussain N, Hussain S A, Hutter D, Iddon J P, Ilkaev R, Inaba M, Innocenti G M, Ippolitov M, Isakov A, Islam M S, Ivanov M, Ivanov V, Izucheev V, Jacak B, Jacazio N, Jacobs P M, Jadlovska S, Jadlovsky J, Jaelani S, Jahnke C, Jakubowska M J, Janik M A, Janson T, Jercic M, Jevons O, Jin M, Jonas F, Jones P G, Jung J, Jung M, Jusko A, Kalinak P, Kalweit A, Kaplin V, Kar S, Karasu Uysal A, Karavichev O, Karavicheva T, Karczmarczyk P, Karpechev E, Kazantsev A, Kebschull U, Keidel R, Keil M, Ketzer B, Khabanova Z, Khan A M, Khan S, Khan S A, Khanzadeev A, Kharlov Y, Khatun A, Khuntia A, Kileng B, Kim B, Kim B, Kim D, Kim D J, Kim E J, Kim H, Kim J, Kim J S, Kim J, Kim J, Kim J, Kim M, Kim S, Kim T, Kim T, Kirsch S, Kisel I, Kiselev S, Kisiel A, Klay J L, Klein C, Klein J, Klein S, Klein-Bösing C, Kleiner M, Kluge A, Knichel M L, Knospe A G, Kobdaj C, Köhler M K, Kollegger T, Kondratyev A, Kondratyeva N, Kondratyuk E, Konig J, Konopka P J, Koska L, Kovalenko O, Kovalenko V, Kowalski M, Králik I, Kravčáková A, Kreis L, Krivda M, Krizek F, Krizkova Gajdosova K, Krüger M, Kryshen E, Krzewicki M, Kubera A M, Kučera V, Kuhn C, Kuijer P G, Kumar L, Kumar S, Kundu S, Kurashvili P, Kurepin A, Kurepin A B, Kuryakin A, Kushpil S, Kvapil J, Kweon M J, Kwon J Y, Kwon Y, La Pointe S L, La Rocca P, Lai Y S, Langoy R, Lapidus K, Lardeux A, Larionov P, Laudi E, Lavicka R, Lazareva T, Lea R, Leardini L, Lee J, Lee S, Lehas F, Lehner S, Lehrbach J, Lemmon R C, León Monzón I, Lesser E D, Lettrich M, Lévai P, Li X, Li X L, Lien J, Lietava R, Lim B, Lindenstruth V, Lindsay S W, Lippmann C, Lisa M A, Litichevskyi V, Liu A, Liu S, Llope W J, Lofnes I M, Loginov V, Loizides C, Loncar P, Lopez X, López Torres E, Luhder J R, Lunardon M, Luparello G, Ma Y, Maevskaya A, Mager M, Mahmood S M, Mahmoud T, Maire A, Majka R D, Malaev M, Malik Q W, Malinina L, Mal'Kevich D, Malzacher P, Mandaglio G, Manko V, Manso F, Manzari V, Mao Y, Marchisone M, Mareš J, Margagliotti G V, Margotti A, Margutti J, Marín A, Markert C, Marquard M, Martin N A, Martinengo P, Martinez J L, Martínez M I, Martínez García G, Martinez Pedreira M, Masciocchi S, Masera M, Masoni A, Massacrier L, Masson E, Mastroserio A, Mathis A M, Matonoha O, Matuoka P F T, Matyja A, Mayer C, Mazzilli M, Mazzoni M A, Mechler A F, Meddi F, Melikyan Y, Menchaca-Rocha A, Mengke C, Meninno E, Meres M, Mhlanga S, Miake Y, Micheletti L, Mihaylov D L, Mikhaylov K, Mischke A, Mishra A N, Miśkowiec D, Modak A, Mohammadi N, Mohanty A P, Mohanty B, Mohisin Khan M, Mordasini C, Moreira De Godoy D A, Moreno L A P, Morozov I, Morsch A, Mrnjavac T, Muccifora V, Mudnic E, Mühlheim D, Muhuri S, Mulligan J D, Munhoz M G, Munzer R H, Murakami H, Murray S, Musa L, Musinsky J, Myers C J, Myrcha J W, Naik B, Nair R, Nandi B K, Nania R, Nappi E, Naru M U, Nassirpour A F, Nattrass C, Nayak R, Nayak T K, Nazarenko S, Neagu A, Negrao De Oliveira R A, Nellen L, Nesbo S V, Neskovic G, Nesterov D, Neumann L T, Nielsen B S, Nikolaev S, Nikulin S, Nikulin V, Noferini F, Nomokonov P, Norman J, Novitzky N, Nowakowski P, Nyanin A, Nystrand J, Ogino M, Ohlson A, Oleniacz J, Oliveira Da Silva A C, Oliver M H, Oppedisano C, Orava R, Ortiz Velasquez A, Oskarsson A, Otwinowski J, Oyama K, Pachmayer Y, Pacik V, Pagano D, Paić G, Pan J, Pandey A K, Panebianco S, Pareek P, Park J, Parkkila J E, Parmar S, Pathak S P, Patra R N, Paul B, Pei H, Peitzmann T, Peng X, Pereira L G, Pereira Da Costa H, Peresunko D, Perez G M, Perez Lezama E, Peskov V, Pestov Y, Petráček V, Petrovici M, Pezzi R P, Piano S, Pikna M, Pillot P, Pinazza O, Pinsky L, Pinto C, Pisano S, Pistone D, Płoskoń M, Planinic M, Pliquett F, Pluta J, Pochybova S, Poghosyan M G, Polichtchouk B, Poljak N, Pop A, Poppenborg H, Porteboeuf-Houssais S, Pozdniakov V, Prasad S K, Preghenella R, Prino F, Pruneau C A, Pshenichnov I, Puccio M, Putschke J, Quishpe R E, Ragoni S, Raha S, Rajput S, Rak J, Rakotozafindrabe A, Ramello L, Rami F, Raniwala R, Raniwala S, Räsänen S S, Rath R, Ratza V, Ravasenga I, Read K F, Redlich K, Rehman A, Reichelt P, Reidt F, Ren X, Renfordt R, Rescakova Z, Revol J-P, Reygers K, Riabov V, Richert T, Richter M, Riedler P, Riegler W, Riggi F, Ristea C, Rode S P, Rodríguez Cahuantzi M, Røed K, Rogalev R, Rogochaya E, Rohr D, Röhrich D, Rokita P S, Ronchetti F, Rosas E D, Roslon K, Rossi A, Rotondi A, Roy A, Roy P, Rueda O V, Rui R, Rumyantsev B, Rustamov A, Ryabinkin E, Ryabov Y, Rybicki A, Rytkonen H, Saarimaki O A M, Sadhu S, Sadovsky S, Šafařík K, Saha S K, Sahoo B, Sahoo P, Sahoo R, Sahoo S, Sahu P K, Saini J, Sakai S, Sambyal S, Samsonov V, Sarkar D, Sarkar N, Sarma P, Sarti V M, Sas M H P, Scapparone E, Schaefer B, Schambach J, Scheid H S, Schiaua C, Schicker R, Schmah A, Schmidt C, Schmidt H R, Schmidt M O, Schmidt M, Schmidt N V, Schmier A R, Schukraft J, Schutz Y, Schwarz K, Schweda K, Scioli G, Scomparin E, Šefčík M, Seger J E, Sekiguchi Y, Sekihata D, Selyuzhenkov I, Senyukov S, Serebryakov D, Serradilla E, Sevcenco A, Shabanov A, Shabetai A, Shahoyan R, Shaikh W, Shangaraev A, Sharma A, Sharma A, Sharma H, Sharma M, Sharma N, Sheikh A I, Shigaki K, Shimomura M, Shirinkin S, Shou Q, Sibiriak Y, Siddhanta S, Siemiarczuk T, Silvermyr D, Simatovic G, Simonetti G, Singh R, Singh R, Singh R, Singh V K, Singhal V, Sinha T, Sitar B, Sitta M, Skaali T B, Slupecki M, Smirnov N, Snellings R J M, Snellman T W, Soncco C, Song J, Songmoolnak A, Soramel F, Sorensen S, Sputowska I, Stachel J, Stan I, Stankus P, Steffanic P J, Stenlund E, Stocco D, Storetvedt M M, Stritto L D, Suaide A A P, Sugitate T, Suire C, Suleymanov M, Suljic M, Sultanov R, Šumbera M, Sumowidagdo S, Swain S, Szabo A, Szarka I, Tabassam U, Taillepied G, Takahashi J, Tambave G J, Tang S, Tarhini M, Tarzila M G, Tauro A, Tejeda Muñoz G, Telesca A, Terrevoli C, Thakur D, Thakur S, Thomas D, Thoresen F, Tieulent R, Tikhonov A, Timmins A R, Toia A, Topilskaya N, Toppi M, Torales-Acosta F, Torres S R, Trifiro A, Tripathy S, Tripathy T, Trogolo S, Trombetta G, Tropp L, Trubnikov V, Trzaska W H, Trzcinski T P, Trzeciak B A, Tsuji T, Tumkin A, Turrisi R, Tveter T S, Ullaland K, Umaka E N, Uras A, Usai G L, Utrobicic A, Vala M, Valle N, Vallero S, van der Kolk N, van Doremalen L V R, van Leeuwen M, Vande Vyvre P, Varga D, Varga Z, Varga-Kofarago M, Vargas A, Vasileiou M, Vasiliev A, Vázquez Doce O, Vechernin V, Veen A M, Vercellin E, Vergara Limón S, Vermunt L, Vernet R, Vértesi R, Vickovic L, Vilakazi Z, Villalobos Baillie O, Villatoro Tello A, Vino G, Vinogradov A, Virgili T, Vislavicius V, Vodopyanov A, Volkel B, Völkl M A, Voloshin K, Voloshin S A, Volpe G, von Haller B, Vorobyev I, Voscek D, Vrláková J, Wagner B, Weber M, Weber S G, Wegrzynek A, Weiser D F, Wenzel S C, Wessels J P, Wiechula J, Wikne J, Wilk G, Wilkinson J, Willems G A, Willsher E, Windelband B, Winn M, Witt W E, Wu Y, Xu R, Yalcin S, Yamakawa K, Yang S, Yano S, Yin Z, Yokoyama H, Yoo I-K, Yoon J H, Yuan S, Yuncu A, Yurchenko V, Zaccolo V, Zaman A, Zampolli C, Zanoli H J C, Zardoshti N, Zarochentsev A, Závada P, Zaviyalov N, Zbroszczyk H, Zhalov M, Zhang S, Zhang X, Zhang Z, Zherebchevskii V, Zhou D, Zhou Y, Zhou Z, Zhu J, Zhu Y, Zichichi A, Zimmermann M B, Zinovjev G, Zurlo N
Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Kolkata, India.
Nuclear Physics Institute of the Czech Academy of Sciences, Řež u Prahy, Czech Republic.
Phys Rev Lett. 2020 Jul 3;125(1):012301. doi: 10.1103/PhysRevLett.125.012301.
The first evidence of spin alignment of vector mesons (K^{*0} and ϕ) in heavy-ion collisions at the Large Hadron Collider (LHC) is reported. The spin density matrix element ρ_{00} is measured at midrapidity (|y|<0.5) in Pb-Pb collisions at a center-of-mass energy (sqrt[s_{NN}]) of 2.76 TeV with the ALICE detector. ρ_{00} values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (p_{T}<2 GeV/c) for K^{*0} and ϕ at a level of 3σ and 2σ, respectively. No significant spin alignment is observed for the K_{S}^{0} meson (spin=0) in Pb-Pb collisions and for the vector mesons in pp collisions. The measured spin alignment is unexpectedly large but qualitatively consistent with the expectation from models which attribute it to a polarization of quarks in the presence of angular momentum in heavy-ion collisions and a subsequent hadronization by the process of recombination.
报告了在大型强子对撞机（LHC）的重离子碰撞中矢量介子（K*0和ϕ）自旋排列的首个证据。利用ALICE探测器，在质心能量（√[sNN]）为2.76 TeV的铅-铅碰撞中，在中快度（|y|<0.5）下测量了自旋密度矩阵元ρ00。对于K*0和ϕ，在低横向动量（pT<2 GeV/c）时，发现ρ00值分别在3σ和2σ水平下小于1/3（1/3意味着无自旋排列）。在铅-铅碰撞中的KS0介子（自旋=0）以及质子-质子碰撞中的矢量介子中，未观察到明显的自旋排列。测量到的自旋排列出乎意料地大，但在定性上与模型的预期一致，这些模型将其归因于重离子碰撞中存在角动量时夸克的极化以及随后通过重组过程的强子化。
