Polarization of $\Lambda$ ($\bar{\Lambda}$) hyperons along the beam direction in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV

STAR Collaboration; J Adam; L Adamczyk; J. R Adams; J. K Adkins; G Agakishiev; M. M Aggarwal; Z Ahammed; I Alekseev; D. M Anderson; R Aoyama; A Aparin; D Arkhipkin; E. C Aschenauer; M. U Ashraf; F Atetalla; A Attri; G. S Averichev; V Bairathi; K Barish; A. J Bassill; A Behera; R Bellwied; A Bhasin; A. K Bhati; J Bielcik; J Bielcikova; L. C Bland; I. G Bordyuzhin; J. D Brandenburg; A. V Brandin; J Bryslawskyj; I Bunzarov; J Butterworth; H Caines; M. Calderón de la Barca Sánchez; D Cebra; I Chakaberia; P Chaloupka; B. K Chan; F-H Chang; Z Chang; N Chankova-Bunzarova; A Chatterjee; S Chattopadhyay; J. H Chen; X Chen; J Cheng; M Cherney; W Christie; H. J Crawford; M Csanád; S Das; T. G Dedovich; I. M Deppner; A. A Derevschikov; L Didenko; C Dilks; X Dong; J. L Drachenberg; J. C Dunlop; T Edmonds; N Elsey; J Engelage; G Eppley; R Esha; S Esumi; O Evdokimov; J Ewigleben; O Eyser; R Fatemi; S Fazio; P Federic; J Fedorisin; Y Feng; P Filip; E Finch; Y Fisyak; L Fulek; C. A Gagliardi; T Galatyuk; F Geurts; A Gibson; K Gopal; D Grosnick; A Gupta; W Guryn; A. I Hamad; A Hamed; J. W Harris; L He; S Heppelmann; N Herrmann; L Holub; Y Hong; S Horvat; B Huang; H. Z Huang; S. L Huang; T Huang; X Huang; T. J Humanic; P Huo; G Igo; W. W Jacobs; C Jena; A Jentsch; Y JI; J Jia; K Jiang; S Jowzaee; X Ju; E. G Judd; S Kabana; S Kagamaster; D Kalinkin; K Kang; D Kapukchyan; K Kauder; H. W Ke; D Keane; A Kechechyan; M Kelsey; Y. V Khyzhniak; D. P Kikoła; C Kim; T. A Kinghorn; I Kisel; A Kisiel; M Kocan; L Kochenda; L. K Kosarzewski; L Kramarik; P Kravtsov; K Krueger; N. Kulathunga Mudiyanselage; L Kumar; R. Kunnawalkam Elayavalli; J. H Kwasizur; R Lacey; J. M Landgraf; J Lauret; A Lebedev; R Lednicky; J. H Lee; C Li; W Li; X Li; Y Li; Y Liang; R Licenik; T Lin; A Lipiec; M. A Lisa; F Liu; H Liu; P Liu; T Liu; X Liu; Y Liu; Z Liu; T Ljubicic; W. J Llope; M Lomnitz; R. S Longacre; S Luo; X Luo; G. L Ma; L Ma; R Ma; Y. G Ma; N Magdy; R Majka; D Mallick; S Margetis; C Markert; H. S Matis; O Matonoha; J. A Mazer; K Meehan; J. C Mei; N. G Minaev; S Mioduszewski; D Mishra; B Mohanty; M. M Mondal; I Mooney; Z Moravcova; D. A Morozov; Md Nasim; K Nayak; J. M Nelson; D. B Nemes; M Nie; G Nigmatkulov; T Niida; L. V Nogach; T Nonaka; G Odyniec; A Ogawa; K Oh; S Oh; V. A Okorokov; B. S Page; R Pak; Y Panebratsev; B Pawlik; D Pawlowska; H Pei; C Perkins; R. L Pintér; J Pluta; J Porter; M Posik; N. K Pruthi; M Przybycien; J Putschke; A Quintero; S. K Radhakrishnan; S Ramachandran; R. L Ray; R Reed; H. G Ritter; J. B Roberts; O. V Rogachevskiy; J. L Romero; L Ruan; J Rusnak; O Rusnakova; N. R Sahoo; P. K Sahu; S Salur; J Sandweiss; J Schambach; W. B Schmidke; N Schmitz; B. R Schweid; F Seck; J Seger; M Sergeeva; R Seto; P Seyboth; N Shah; E Shahaliev; P. V Shanmuganathan; M Shao; F Shen; W. Q Shen; S. S Shi; Q. Y Shou; E. P Sichtermann; S Siejka; R Sikora; M Simko; J Singh; S Singha; D Smirnov; N Smirnov; W Solyst; P Sorensen; H. M Spinka; B Srivastava; T. D. S Stanislaus; M Stefaniak; D. J Stewart; M Strikhanov; B Stringfellow; A. A. P Suaide; T Sugiura; M Sumbera; B Summa; X. M Sun; Y Sun; B Surrow; D. N Svirida; P Szymanski; A. H Tang; Z Tang; A Taranenko; T Tarnowsky; J. H Thomas; A. R Timmins; D Tlusty; T Todoroki; M Tokarev; C. A Tomkiel; S Trentalange; R. E Tribble; P Tribedy; S. K Tripathy; O. D Tsai; B Tu; Z Tu; T Ullrich; D. G Underwood; I Upsal; G Van Buren; J Vanek; A. N Vasiliev; I Vassiliev; F Videbæk; S Vokal; S. A Voloshin; F Wang; G Wang; P Wang; Y Wang; J. C Webb; L Wen; G. D Westfall; H Wieman; S. W Wissink; R Witt; Y Wu; Z. G Xiao; G Xie; W Xie; H Xu; N Xu; Q. H Xu; Y. F Xu; Z Xu; C Yang; Q Yang; S Yang; Y Yang; Z Yang; Z Ye; L Yi; K Yip; I. -K Yoo; H Zbroszczyk; W Zha; D Zhang; L Zhang; S Zhang; X. P Zhang; Y Zhang; Z Zhang; J Zhao; C Zhong; C Zhou; X Zhu; Z Zhu; M Zurek; M Zyzak

doi:10.48550/arxiv.1905.11917

$Polarization of $\Lambda$ ($\bar{\Lambda}$) hyperons along the beam direction in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV$

Preprint

Polarization of $\Lambda$ ($\bar{\Lambda}$) hyperons along the beam direction in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV

STAR Collaboration, J Adam, L Adamczyk, J. R Adams, J. K Adkins, G Agakishiev, M. M Aggarwal, Z Ahammed, I Alekseev, D. M Anderson, …

05/28/2019

DOI: https://doi.org/10.48550/arxiv.1905.11917

Abstract

Physics - Nuclear Experiment

The $\Lambda$ ($\bar{\Lambda}$) hyperon polarization along the beam direction has been measured for the first time in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV. The polarization dependence on the hyperons' emission angle relative to the second-order event plane exhibits a sine modulation, indicating a quadrupole pattern of the vorticity component along the beam direction. The polarization is found to increase in more peripheral collisions, and shows no strong transverse momentum ($p_T$) dependence at $p_T>1$ GeV/$c$. The magnitude of the signal is about five times smaller than those predicted by hydrodynamic and multiphase transport models; the observed phase of the emission angle dependence is also opposite to these model predictions. In contrast, blast-wave model calculations reproduce the modulation phase measured in the data and capture the centrality and transverse momentum dependence of the signal once the model is required to reproduce the azimuthal dependence of the Gaussian source radii measured via the Hanbury-Brown and Twiss intensity interferometry technique.

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Title: Polarization of $\Lambda$ ($\bar{\Lambda}$) hyperons along the beam direction in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV
Creators: STAR Collaboration
J Adam
L Adamczyk
J. R Adams
J. K Adkins
G Agakishiev
M. M Aggarwal
Z Ahammed
I Alekseev
D. M Anderson
R Aoyama
A Aparin
D Arkhipkin
E. C Aschenauer
M. U Ashraf
F Atetalla
A Attri
G. S Averichev
V Bairathi
K Barish
A. J Bassill
A Behera
R Bellwied
A Bhasin
A. K Bhati
J Bielcik
J Bielcikova
L. C Bland
I. G Bordyuzhin
J. D Brandenburg
A. V Brandin
J Bryslawskyj
I Bunzarov
J Butterworth
H Caines
M. Calderón de la Barca Sánchez
D Cebra
I Chakaberia
P Chaloupka
B. K Chan
F-H Chang
Z Chang
N Chankova-Bunzarova
A Chatterjee
S Chattopadhyay
J. H Chen
X Chen
J Cheng
M Cherney
W Christie
H. J Crawford
M Csanád
S Das
T. G Dedovich
I. M Deppner
A. A Derevschikov
L Didenko
C Dilks
X Dong
J. L Drachenberg
J. C Dunlop
T Edmonds
N Elsey
J Engelage
G Eppley
R Esha
S Esumi
O Evdokimov
J Ewigleben
O Eyser
R Fatemi
S Fazio
P Federic
J Fedorisin
Y Feng
P Filip
E Finch
Y Fisyak
L Fulek
C. A Gagliardi
T Galatyuk
F Geurts
A Gibson
K Gopal
D Grosnick
A Gupta
W Guryn
A. I Hamad
A Hamed
J. W Harris
L He
S Heppelmann
N Herrmann
L Holub
Y Hong
S Horvat
B Huang
H. Z Huang
S. L Huang
T Huang
X Huang
T. J Humanic
P Huo
G Igo
W. W Jacobs
C Jena
A Jentsch
Y JI
J Jia
K Jiang
S Jowzaee
X Ju
E. G Judd
S Kabana
S Kagamaster
D Kalinkin
K Kang
D Kapukchyan
K Kauder
H. W Ke
D Keane
A Kechechyan
M Kelsey
Y. V Khyzhniak
D. P Kikoła
C Kim
T. A Kinghorn
I Kisel
A Kisiel
M Kocan
L Kochenda
L. K Kosarzewski
L Kramarik
P Kravtsov
K Krueger
N. Kulathunga Mudiyanselage
L Kumar
R. Kunnawalkam Elayavalli
J. H Kwasizur
R Lacey
J. M Landgraf
J Lauret
A Lebedev
R Lednicky
J. H Lee
C Li
W Li
X Li
Y Li
Y Liang
R Licenik
T Lin
A Lipiec
M. A Lisa
F Liu
H Liu
P Liu
T Liu
X Liu
Y Liu
Z Liu
T Ljubicic
W. J Llope
M Lomnitz
R. S Longacre
S Luo
X Luo
G. L Ma
L Ma
R Ma
Y. G Ma
N Magdy
R Majka
D Mallick
S Margetis
C Markert
H. S Matis
O Matonoha
J. A Mazer
K Meehan
J. C Mei
N. G Minaev
S Mioduszewski
D Mishra
B Mohanty
M. M Mondal
I Mooney
Z Moravcova
D. A Morozov
Md Nasim
K Nayak
J. M Nelson
D. B Nemes
M Nie
G Nigmatkulov
T Niida
L. V Nogach
T Nonaka
G Odyniec
A Ogawa
K Oh
S Oh
V. A Okorokov
B. S Page
R Pak
Y Panebratsev
B Pawlik
D Pawlowska
H Pei
C Perkins
R. L Pintér
J Pluta
J Porter
M Posik
N. K Pruthi
M Przybycien
J Putschke
A Quintero
S. K Radhakrishnan
S Ramachandran
R. L Ray
R Reed
H. G Ritter
J. B Roberts
O. V Rogachevskiy
J. L Romero
L Ruan
J Rusnak
O Rusnakova
N. R Sahoo
P. K Sahu
S Salur
J Sandweiss
J Schambach
W. B Schmidke
N Schmitz
B. R Schweid
F Seck
J Seger
M Sergeeva
R Seto
P Seyboth
N Shah
E Shahaliev
P. V Shanmuganathan
M Shao
F Shen
W. Q Shen
S. S Shi
Q. Y Shou
E. P Sichtermann
S Siejka
R Sikora
M Simko
J Singh
S Singha
D Smirnov
N Smirnov
W Solyst
P Sorensen
H. M Spinka
B Srivastava
T. D. S Stanislaus
M Stefaniak
D. J Stewart
M Strikhanov
B Stringfellow
A. A. P Suaide
T Sugiura
M Sumbera
B Summa
X. M Sun
Y Sun
B Surrow
D. N Svirida
P Szymanski
A. H Tang
Z Tang
A Taranenko
T Tarnowsky
J. H Thomas
A. R Timmins
D Tlusty
T Todoroki
M Tokarev
C. A Tomkiel
S Trentalange
R. E Tribble
P Tribedy
S. K Tripathy
O. D Tsai
B Tu
Z Tu
T Ullrich
D. G Underwood
I Upsal
G Van Buren
J Vanek
A. N Vasiliev
I Vassiliev
F Videbæk
S Vokal
S. A Voloshin
F Wang
G Wang
P Wang
Y Wang
J. C Webb
L Wen
G. D Westfall
H Wieman
S. W Wissink
R Witt
Y Wu
Z. G Xiao
G Xie
W Xie
H Xu
N Xu
Q. H Xu
Y. F Xu
Z Xu
C Yang
Q Yang
S Yang
Y Yang
Z Yang
Z Ye
L Yi
K Yip
I. -K Yoo
H Zbroszczyk
W Zha
D Zhang
L Zhang
S Zhang
X. P Zhang
Y Zhang
Z Zhang
J Zhao
C Zhong
C Zhou
X Zhu
Z Zhu
M Zurek
M Zyzak
Identifiers: 991006034134402656
Academic Unit: Physics
Language: English
Resource Type: Preprint

Polarization of $\Lambda$ ($\bar{\Lambda}$) hyperons along the beam direction in Au+Au collisions at $\sqrt{s_{_{NN}}}$ = 200 GeV

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