<p>The STAR experiment reports new, high-precision measurements of the transverse single-spin asymmetries for <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>π</mi><mo>±</mo></msup></math> within jets, namely the Collins asymmetries, from transversely polarized <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>p</mi><mo stretchy="false">↑</mo></msup><mi>p</mi></math> collisions at <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>510</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi></mrow></math>. The energy-scaled distribution of jet transverse momentum, <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>x</mi></mrow><mrow><mi mathvariant="normal">T</mi></mrow></msub><mo>=</mo><mn>2</mn><msub><mrow><mi>p</mi></mrow><mrow><mi mathvariant="normal">T</mi><mo>,</mo><mtext>jet</mtext></mrow></msub><mo>/</mo><msqrt><mrow><mi>s</mi></mrow></msqrt></mrow></math>, shows a remarkable consistency for Collins asymmetries of <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>π</mi><mo>±</mo></msup></math> in jets between <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>200</mn><mtext> </mtext><mtext> </mtext><mi>GeV</mi></math> and 510 GeV. This indicates that the Collins asymmetries are nearly energy independent, with, at most, a very weak scale dependence in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><msup><mi>p</mi><mo stretchy="false">↑</mo></msup><mi>p</mi></math> collisions. These results extend to high-momentum scales (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>Q</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>≤</mo><mn>3400</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi>GeV</mi></mrow><mrow><mn>2</mn></mrow></msup></mrow></math>) and enable unique tests of evolution and universality in the transverse-momentum-dependent formalism, thus providing important constraints for the Collins fragmentation functions.</p>

B.E. Aboona

Czechia

J. Adam

Poland

L. Adamczyk

India

I. Aggarwal

M.M. Aggarwal

Z. Ahammed

A.K. Alshammri

E.C. Aschenauer

S. Aslam

J. Atchison

Chile

V. Bairathi

X. Bao

P. Barik

K. Barish

S. Behera

R. Bellwied

P. Bhagat

A. Bhasin

S. Bhatta

S.R. Bhosale

J. Bielcik

J. Bielcikova

J.D. Brandenburg

C. Broodo

X.Z. Cai

H. Caines

M. Calderón de la Barca Sánchez

D. Cebra

J. Ceska

I. Chakaberia

P. Chaloupka

Y.S. Chang

Z. Chang

A. Chatterjee

D. Chen

J.H. Chen

Q. Chen

W. Chen

Z. Chen

J. Cheng

Y. Cheng

W. Christie

X. Chu

S. Corey

H.J. Crawford

Hungary

M. Csanád

G. Dale-Gau

A. Das

D. De Souza Lemos

Germany

I.M. Deppner

A. Deshpande

A. Dhamija

A. Dimri

P. Dixit

X. Dong

J.L. Drachenberg

E. Duckworth

J.C. Dunlop

Egypt

Y.S. El-Feky

J. Engelage

G. Eppley

Japan

S. Esumi

O. Evdokimov

O. Eyser

China

B. Fan

R. Fatemi

Italy

S. Fazio

H. Feng

Y. Feng

E. Finch

Y. Fisyak

F.A. Flor

C. Fu

T. Fu

C.A. Gagliardi

T. Galatyuk

T. Gao

Y. Gao

G. Garcia

F. Geurts

A. Gibson

A. Giri

K. Gopal

X. Gou

D. Grosnick

A. Gu

J. Gu

A. Gupta

W. Guryn

A. Hamed

R.J. Hamilton

J. Han

X. Han

S. Harabasz

M.D. Harasty

J.W. Harris

H. Harrison-Smith

L.B. Havener

X.H. He

Y. He

Energy Independence of the Collins Asymmetry in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>p</mi></mrow><mrow><mo stretchy="false">↑</mo></mrow></msup><mi>p</mi></mrow></math> Collisions

The polarization of <math altimg='si1.svg'><mstyle mathvariant='normal'><mi>&#923;</mi></mstyle></math>, <math altimg='si6.svg'><mover accent='true'><mstyle mathvariant='normal'><mi>&#923;</mi></mstyle><mo>&#175;</mo></mover></math>, <math altimg='si3.svg'><msup><mstyle mathvariant='normal'><mi>&#926;</mi></mstyle><mo>&#8722;</mo></msup></math>, and <math altimg='si16.svg'><msup><mover accent='true'><mstyle mathvariant='normal'><mi>&#926;</mi></mstyle><mo>&#175;</mo></mover><mo>+</mo></msup></math> hyperons along the angular momentum of the system has been measured in isobar collisions of Ru+Ru and Zr+Zr at <math altimg='si5.svg'><msqrt><msub><mi>s</mi><msub><mrow /><mrow><mrow><mi mathvariant='normal'>N</mi></mrow><mi>N</mi></mrow></msub></msub></msqrt></math> = 200&#8239;GeV with the STAR detector at RHIC. The polarization dependence on collision centrality exhibits an increasing trend in more peripheral collisions. <math altimg='si1.svg'><mstyle mathvariant='normal'><mi>&#923;</mi></mstyle></math> and <math altimg='si6.svg'><mover accent='true'><mstyle mathvariant='normal'><mi>&#923;</mi></mstyle><mo>&#175;</mo></mover></math> polarization dependence on the transverse momentum and pseudorapidity have been investigated, but no significant dependence was observed. The polarizations of <math altimg='si1.svg'><mstyle mathvariant='normal'><mi>&#923;</mi></mstyle></math> and <math altimg='si6.svg'><mover accent='true'><mstyle mathvariant='normal'><mi>&#923;</mi></mstyle><mo>&#175;</mo></mover></math> are found to be consistent with each other, indicating little contribution of the spin-magnetic coupling to the measured polarization. Comparison to previously measured polarization in Au+Au collisions show no obvious system size dependence. The results are qualitatively consistent with hydrodynamic calculations including contributions from shear-induced polarization and thermal vorticity. For the first time in heavy-ion collisions, the dependence of the global polarization on the hyperon&#8217;s emission azimuthal angle relative to the second-order event plane has been measured, indicating stronger polarization for the in-plane emitted hyperons at the level of 2.4 <math altimg='si17.svg'><mi>&#963;</mi></math> significance in 20&#8211;50 % centrality. The <math altimg='si18.svg'><mstyle mathvariant='normal'><mi>&#926;</mi></mstyle></math> hyperon polarization measurements via polarization transfer analysis yield finite positive values with 2.9 <math altimg='si17.svg'><mi>&#963;</mi></math> significance in 20&#8211;50 % centrality, slightly larger compared to the inclusive <math altimg='si1.svg'><mstyle mathvariant='normal'><mi>&#923;</mi></mstyle></math> polarization.

JINR

G. Agakishiev

A. Aitbayev

I. Alekseev

E. Alpatov

A. Aparin

G.S. Averichev

I.G. Bordyuzhin

A.V. Brandin

M. Calderón de La Barca Sánchez

M. Csanad

T.G. Dedovich

A.A. Derevschikov

C. Hu

Q. Hu

Y. Hu

H. Huang

Hyperon global polarization in isobar Ru+Ru and Zr+Zr collisions at <math altimg='si15.svg'><mrow><msqrt><msub><mi>s</mi><msub><mrow /><mrow><mrow><mi mathvariant='normal'>N</mi></mrow><mi>N</mi></mrow></msub></msub></msqrt><mo linebreak='goodbreak'>=</mo><mn>200</mn><mrow><mrow><mi mathvariant='normal'>G</mi></mrow><mi>e</mi><mi>V</mi></mrow></mrow></math>

We report on the measurements of directed flow <math altimg='si14.svg'><msub><mi>v</mi><mn>1</mn></msub></math> and elliptic flow <math altimg='si9.svg'><msub><mi>v</mi><mn>2</mn></msub></math> for hadrons ( <math altimg='si4.svg'><msup><mi>&#960;</mi><mo>&#177;</mo></msup></math>, <math altimg='si5.svg'><msup><mi>K</mi><mo>&#177;</mo></msup></math>, <math altimg='si6.svg'><msubsup><mi>K</mi><mrow><mi>S</mi></mrow><mn>0</mn></msubsup></math>, <math altimg='si15.svg'><mi>p</mi></math>, <math altimg='si7.svg'><mi>&#981;</mi></math>, <math altimg='si2.svg'><mstyle mathvariant='normal'><mi>&#923;</mi></mstyle></math> and <math altimg='si8.svg'><msup><mstyle mathvariant='normal'><mi>&#926;</mi></mstyle><mo>&#8722;</mo></msup></math>) from Au+Au collisions at <math altimg='si16.svg'><msqrt><msub><mi>s</mi><mrow><mi>N</mi><mi>N</mi></mrow></msub></msqrt></math> = 3 GeV and <math altimg='si9.svg'><msub><mi>v</mi><mn>2</mn></msub></math> for ( <math altimg='si4.svg'><msup><mi>&#960;</mi><mo>&#177;</mo></msup></math>, <math altimg='si5.svg'><msup><mi>K</mi><mo>&#177;</mo></msup></math>, <math altimg='si15.svg'><mi>p</mi></math> and <math altimg='si17.svg'><mover><mrow><mi>p</mi></mrow><mo stretchy='true'>&#8254;</mo></mover></math>) at 27 and 54.4 GeV with the STAR experiment. While at the two higher energy midcentral collisions the number-of-constituent-quark (NCQ) scaling holds, at 3 GeV the <math altimg='si9.svg'><msub><mi>v</mi><mn>2</mn></msub></math> at midrapidity is negative for all hadrons and the NCQ scaling is absent. In addition, the <math altimg='si14.svg'><msub><mi>v</mi><mn>1</mn></msub></math> slopes at midrapidity for almost all observed hadrons are found to be positive, implying dominant repulsive baryonic interactions. The features of negative <math altimg='si9.svg'><msub><mi>v</mi><mn>2</mn></msub></math> and positive <math altimg='si14.svg'><msub><mi>v</mi><mn>1</mn></msub></math> slope at 3 GeV can be reproduced with a baryonic mean-field in transport model calculations. These results imply that the medium in such collisions is likely characterized by baryonic interactions.

United States

D. Isenhower

M. Daugherity

L. Fulek

M. Przybycien

R. Sikora

Russia

D.N. Svirida

D.G. Underwood

H.M. Spinka

M. Zurek

F.M. Fawzi

M.S. Abdallah

J. Jia

A. Jentsch

A. Kiselev

A. Lebedev

A. Ogawa

A.H. Tang

A.S. Nunes

B.S. Page

F. Videbæk

G. Van Buren

H.W. Ke

J. Lauret

J.C. Webb

J.H. Lee

J.M. Landgraf

K. Kauder

K. Yip

L. Didenko

L. Ruan

P. Sorensen

P. Tribedy

P.V. Shanmuganathan

R. Ma

R. Pak

R.S. Longacre

T. Ljubicic

T. Ullrich

W.B. Schmidke

Z. Tu

Z. Xu

Z. Zhang

C. Perkins

E.G. Judd

J.M. Nelson

B. Kimelman

J.L. Romero

S. Heppelmann

Z.W. Sweger

B.K. Chan

D. Neff

G. Igo

G. Wang

H.Z. Huang

L. Wen

M. Sergeeva

O.D. Tsai

S. Trentalange

C. Kim

C. Racz

D. Kapukchyan

E. Loyd

M. Chevalier

M.L. Kabir

R. Seto

W. Baker

X. Liang

Erratum: Disappearance of partonic collectivity in √ <italic>s</italic> <inf>NN</inf> = 3 GeV Au+Au collisions at RHIC [Phys. Lett. B 827, 137003 (2022)]