Measurement of away-side broadening with self-subtraction of flow in Au+Au collisions at ■

作者：J.Adam; L.Adamczyk; J.R.Adams; J.K.Adkins; G.Agakishiev; M.M.Aggarwal; Z.Ahammed; I.Alekseev; D.M.Anderson; A.Aparin; E.C.Aschenauer; M.U.Ashraf; F.G.Atetalla; A.Attri; G.S.Averichev; V.Bairathi; K.Barish; A.Behera; R.Bellwied; A.Bhasin; J.Bielcik; J.Bielcikova; L.C.Bland; I.G.Bordyuzhin; J.D.Brandenburg; A.V.Brandin; 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; D.Chen; J.H.Chen

来源：Chinese Physics C, 2020, 44(10): 63-71.

• di-hadron correlations
• jet
• heavy-ion

High transverse momentum (p T) particle production is suppressed owing to the parton (jet) energy loss in the hot dense medium created in relativistic heavy-ion collisions.Redistribution of energy at low-to-modest p T has been difficult to measure,owing to large anisotropic backgrounds.We report a data-driven method for background evaluation and subtraction,exploiting the away-side pseudorapidity gaps,to measure the jetlike correlation shape in Au+Au collisions at ■Ge V in the STAR experiment.The correlation shapes,for trigger particles p T>3 Ge V/cand various associated particle p T ranges within0.5<p T<10 Ge V/c,are consistent with Gaussians,and their widths increase with centrality.The results indicate jet broadening in the medium created in central heavyion collisions.