在 $\sqrt{s_{_{NN}}}$ = 200 GeV 的 Au+Au 碰撞中沿束流方向的 $\Lambda$ ($\bar{\Lambda}$) 超子极化
核实验
2019-10-02 v1
摘要
在 = 200 GeV 的 Au+Au 碰撞中，首次测量了沿束流方向的 () 超子极化。超子相对于二阶事件平面的发射角的极化依赖性表现出正弦调制，表明沿束流方向的涡度分量呈四极矩图样。发现极化在更边缘的碰撞中增加，并且在 GeV/ 时没有表现出强烈的横向动量（）依赖性。信号幅度比流体力学和多相输运模型的预测值小约五倍；观测到的发射角依赖性的相位也与这些模型预测相反。相比之下，一旦要求该模型再现通过 Hanbury-Brown 和 Twiss 强度干涉技术测量的高斯源半径的方位角依赖性，爆轰波模型计算就能再现数据中测得的调制相位，并捕捉信号的碰撞中心度和横向动量依赖性。
引用
@article{arxiv.1905.11917,
title = {Polarization of $\Lambda$ ($\bar{\Lambda}$) hyperons along the beam direction in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV},
author = {STAR Collaboration and J. Adam and L. Adamczyk and J. R. Adams and J. K. Adkins and G. Agakishiev and M. M. Aggarwal and Z. Ahammed and I. Alekseev and D. M. Anderson and R. Aoyama and A. Aparin and D. Arkhipkin and E. C. Aschenauer and M. U. Ashraf and F. Atetalla and A. Attri and G. S. Averichev and V. Bairathi and K. Barish and A. J. Bassill and A. Behera and R. Bellwied and A. Bhasin and A. K. Bhati and J. Bielcik and J. Bielcikova and L. C. Bland and I. G. Bordyuzhin and J. D. Brandenburg and A. V. Brandin and J. Bryslawskyj and I. Bunzarov and J. Butterworth and H. Caines and M. Calderón de la Barca Sánchez and D. Cebra and I. Chakaberia and P. Chaloupka and B. K. Chan and F-H. Chang and Z. Chang and N. Chankova-Bunzarova and A. Chatterjee and S. Chattopadhyay and J. H. Chen and X. Chen and J. Cheng and M. Cherney and W. Christie and H. J. Crawford and M. Csanád and S. Das and T. G. Dedovich and I. M. Deppner and A. A. Derevschikov and L. Didenko and C. Dilks and X. Dong and J. L. Drachenberg and J. C. Dunlop and T. Edmonds and N. Elsey and J. Engelage and G. Eppley and R. Esha and S. Esumi and O. Evdokimov and J. Ewigleben and O. Eyser and R. Fatemi and S. Fazio and P. Federic and J. Fedorisin and Y. Feng and P. Filip and E. Finch and Y. Fisyak and L. Fulek and C. A. Gagliardi and T. Galatyuk and F. Geurts and A. Gibson and K. Gopal and D. Grosnick and A. Gupta and W. Guryn and A. I. Hamad and A. Hamed and J. W. Harris and L. He and S. Heppelmann and S. Heppelmann and N. Herrmann and L. Holub and Y. Hong and S. Horvat and B. Huang and H. Z. Huang and S. L. Huang and T. Huang and X. Huang and T. J. Humanic and P. Huo and G. Igo and W. W. Jacobs and C. Jena and A. Jentsch and Y. JI and J. Jia and K. Jiang and S. Jowzaee and X. Ju and E. G. Judd and S. Kabana and S. Kagamaster and D. Kalinkin and K. Kang and D. Kapukchyan and K. Kauder and H. W. Ke and D. Keane and A. Kechechyan and M. Kelsey and Y. V. Khyzhniak and D. P. Kikoła and C. Kim and T. A. Kinghorn and I. Kisel and A. Kisiel and M. Kocan and L. Kochenda and L. K. Kosarzewski and L. Kramarik and P. Kravtsov and K. Krueger and N. Kulathunga Mudiyanselage and L. Kumar and R. Kunnawalkam Elayavalli and J. H. Kwasizur and R. Lacey and J. M. Landgraf and J. Lauret and A. Lebedev and R. Lednicky and J. H. Lee and C. Li and W. Li and W. Li and X. Li and Y. Li and Y. Liang and R. Licenik and T. Lin and A. Lipiec and M. A. Lisa and F. Liu and H. Liu and P. Liu and P. Liu and T. Liu and X. Liu and Y. Liu and Z. Liu and T. Ljubicic and W. J. Llope and M. Lomnitz and R. S. Longacre and S. Luo and X. Luo and G. L. Ma and L. Ma and R. Ma and Y. G. Ma and N. Magdy and R. Majka and D. Mallick and S. Margetis and C. Markert and H. S. Matis and O. Matonoha and J. A. Mazer and K. Meehan and J. C. Mei and N. G. Minaev and S. Mioduszewski and D. Mishra and B. Mohanty and M. M. Mondal and I. Mooney and Z. Moravcova and D. A. Morozov and Md. Nasim and K. Nayak and J. M. Nelson and D. B. Nemes and M. Nie and G. Nigmatkulov and T. Niida and L. V. Nogach and T. Nonaka and G. Odyniec and A. Ogawa and K. Oh and S. Oh and V. A. Okorokov and B. S. Page and R. Pak and Y. Panebratsev and B. Pawlik and D. Pawlowska and H. Pei and C. Perkins and R. L. Pintér and J. Pluta and J. Porter and M. Posik and N. K. Pruthi and M. Przybycien and J. Putschke and A. Quintero and S. K. Radhakrishnan and S. Ramachandran and R. L. Ray and R. Reed and H. G. Ritter and J. B. Roberts and O. V. Rogachevskiy and J. L. Romero and L. Ruan and J. Rusnak and O. Rusnakova and N. R. Sahoo and P. K. Sahu and S. Salur and J. Sandweiss and J. Schambach and W. B. Schmidke and N. Schmitz and B. R. Schweid and F. Seck and J. Seger and M. Sergeeva and R. Seto and P. Seyboth and N. Shah and E. Shahaliev and P. V. Shanmuganathan and M. Shao and F. Shen and W. Q. Shen and S. S. Shi and Q. Y. Shou and E. P. Sichtermann and S. Siejka and R. Sikora and M. Simko and J. Singh and S. Singha and D. Smirnov and N. Smirnov and W. Solyst and P. Sorensen and H. M. Spinka and B. Srivastava and T. D. S. Stanislaus and M. Stefaniak and D. J. Stewart and M. Strikhanov and B. Stringfellow and A. A. P. Suaide and T. Sugiura and M. Sumbera and B. Summa and X. M. Sun and Y. Sun and Y. Sun and B. Surrow and D. N. Svirida and P. Szymanski and A. H. Tang and Z. Tang and A. Taranenko and T. Tarnowsky and J. H. Thomas and A. R. Timmins and D. Tlusty and T. Todoroki and M. Tokarev and C. A. Tomkiel and S. Trentalange and R. E. Tribble and P. Tribedy and S. K. Tripathy and O. D. Tsai and B. Tu and Z. Tu and T. Ullrich and D. G. Underwood and I. Upsal and G. Van Buren and J. Vanek and A. N. Vasiliev and I. Vassiliev and F. Videbæk and S. Vokal and S. A. Voloshin and F. Wang and G. Wang and P. Wang and Y. Wang and Y. Wang and J. C. Webb and L. Wen and G. D. Westfall and H. Wieman and S. W. Wissink and R. Witt and Y. Wu and Z. G. Xiao and G. Xie and W. Xie and H. Xu and N. Xu and Q. H. Xu and Y. F. Xu and Z. Xu and C. Yang and Q. Yang and S. Yang and Y. Yang and Z. Yang and Z. Ye and Z. Ye and L. Yi and K. Yip and I. -K. Yoo and H. Zbroszczyk and W. Zha and D. Zhang and L. Zhang and S. Zhang and S. Zhang and X. P. Zhang and Y. Zhang and Z. Zhang and J. Zhao and C. Zhong and C. Zhou and X. Zhu and Z. Zhu and M. Zurek and M. Zyzak},
journal= {arXiv preprint arXiv:1905.11917},
year = {2019}
}
备注
8 pages, 4 figures, Submitted to Phys. Rev. Lett