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Evidence of Spin-Orbital Angular Momentum Interactions in Relativistic Heavy-Ion Collisions.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-06-30 , DOI: 10.1103/physrevlett.125.012301
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Ilkaev 77 , M Inaba 90 , G M Innocenti 6 , M Ippolitov 15 , A Isakov 2 , M S Islam 88 , M Ivanov 13 , V Ivanov 58 , V Izucheev 107 , B Jacak 33 , N Jacazio 9 , P M Jacobs 33 , S Jadlovska 120 , J Jadlovsky 120 , S Jaelani 54 , C Jahnke 73 , M J Jakubowska 96 , M A Janik 96 , T Janson 3 , M Jercic 106 , O Jevons 26 , M Jin 32 , F Jonas 27, 68 , P G Jones 26 , J Jung 23 , M Jung 23 , A Jusko 26 , P Kalinak 121 , A Kalweit 6 , V Kaplin 57 , S Kar 17 , A Karasu Uysal 122 , O Karavichev 105 , T Karavicheva 105 , P Karczmarczyk 6 , E Karpechev 105 , A Kazantsev 15 , U Kebschull 3 , R Keidel 123 , M Keil 6 , B Ketzer 41 , Z Khabanova 83 , A M Khan 17 , S Khan 10 , S A Khan 1 , A Khanzadeev 58 , Y Kharlov 107 , A Khatun 10 , A Khuntia 82 , B Kileng 118 , B Kim 55 , B Kim 90 , D Kim 124 , D J Kim 125 , E J Kim 126 , H Kim 124, 127 , J Kim 124 , J S Kim 38 , J Kim 28 , J Kim 124 , J Kim 126 , M Kim 28 , S Kim 128 , T Kim 124 , T Kim 124 , S Kirsch 23, 99 , I Kisel 99 , S Kiselev 12 , A Kisiel 96 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D Lesser 104 , M Lettrich 6 , P Lévai 45 , X Li 132 , X L Li 17 , J Lien 131 , R Lietava 26 , B Lim 127 , V Lindenstruth 99 , S W Lindsay 76 , C Lippmann 13 , M A Lisa 81 , V Litichevskyi 74 , A Liu 104 , S Liu 81 , W J Llope 49 , I M Lofnes 22 , V Loginov 57 , C Loizides 68 , P Loncar 114 , X Lopez 47 , E López Torres 103 , J R Luhder 27 , M Lunardon 48 , G Luparello 108 , Y Ma 133 , A Maevskaya 105 , M Mager 6 , S M Mahmood 35 , T Mahmoud 41 , A Maire 56 , R D Majka 72 , M Malaev 58 , Q W Malik 35 , L Malinina 50 , D Mal'Kevich 12 , P Malzacher 13 , G Mandaglio 37 , V Manko 15 , F Manso 47 , V Manzari 87 , Y Mao 17 , M Marchisone 89 , J Mareš 134 , G V Margagliotti 85 , A Margotti 9 , J Margutti 54 , A Marín 13 , C Markert 66 , M Marquard 23 , N A Martin 28 , P Martinengo 6 , J L Martinez 32 , M I Martínez 84 , G Martínez García 34 , M Martinez Pedreira 6 , S Masciocchi 13 , M Masera 44 , A Masoni 86 , L Massacrier 36 , E Masson 34 , A Mastroserio 87, 135 , A M Mathis 42, 65 , O 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12 , S A Voloshin 49 , G Volpe 102 , B von Haller 6 , I Vorobyev 42 , D Voscek 120 , J Vrláková 70 , B Wagner 22 , M Weber 78 , S G Weber 27 , A Wegrzynek 6 , D F Weiser 28 , S C Wenzel 6 , J P Wessels 27 , J Wiechula 23 , J Wikne 35 , G Wilk 101 , J Wilkinson 8, 9 , G A Willems 6 , E Willsher 26 , B Windelband 28 , M Winn 40 , W E Witt 59 , Y Wu 147 , R Xu 17 , S Yalcin 122 , K Yamakawa 143 , S Yang 22 , S Yano 40 , Z Yin 17 , H Yokoyama 54 , I-K Yoo 127 , J H Yoon 55 , S Yuan 22 , A Yuncu 28 , V Yurchenko 21 , V Zaccolo 85 , A Zaman 19 , C Zampolli 6 , H J C Zanoli 54 , N Zardoshti 6 , A Zarochentsev 24 , P Závada 134 , N Zaviyalov 77 , H Zbroszczyk 96 , M Zhalov 58 , S Zhang 133 , X Zhang 17 , Z Zhang 17 , V Zherebchevskii 24 , D Zhou 17 , Y Zhou 53 , Z Zhou 22 , J Zhu 13, 17 , Y Zhu 17 , A Zichichi 8, 20 , M B Zimmermann 6 , G Zinovjev 21 , N Zurlo 71 ,
Affiliation  

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 ρ00 is measured at midrapidity (|y|<0.5) in Pb-Pb collisions at a center-of-mass energy (sNN) of 2.76 TeV with the ALICE detector. ρ00 values are found to be less than 1/3 (1/3 implies no spin alignment) at low transverse momentum (pT<2GeV/c) for K*0 and ϕ at a level of 3σ and 2σ, respectively. No significant spin alignment is observed for the KS0 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.

中文翻译:

相对论重离子碰撞中自旋轨道角动量相互作用的证据。

矢量介子自旋对准的第一个证据(ķ*0ϕ据报道,在大型强子对撞机(LHC)发生重离子碰撞时。自旋密度矩阵元素ρ00 在中速时测量(|ÿ|<0.5)在质心能量(s神经网络)和ALICE检测器的2.76 TeV)。 ρ00 发现值小于 1个/31个/3 表示没有自旋对准)在低横向动量(pŤ<2GeV/Cķ*0ϕ 在...的水平 3σ2σ, 分别。没有观察到明显的自旋对准ķ小号0 介子(旋转=0)在Pb-Pb碰撞中以及在矢量介子中 pp碰撞。测得的自旋对准出乎意料地大,但在质量上与模型的预期一致,这归因于重离子碰撞中角动量存在时夸克的极化和重组过程随后的强子化。
更新日期:2020-06-30
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