ΛK femtoscopy in Pb-Pb collisions at √sNN=2.76 TeV

被引:13
作者
Acharya, S. [144 ]
Adamova, D. [98 ]
Adler, A. [77 ]
Adolfsson, J. [84 ]
Aggarwal, M. M. [103 ]
Rinella, G. Aglieri [37 ]
Agnello, M. [31 ]
Agrawal, N. [10 ,57 ]
Ahammed, Z. [144 ]
Ahmad, S. [16 ]
Ahn, S. U. [79 ]
Akbar, Z. [54 ]
Akindinov, A. [95 ]
Al-Turany, M. [110 ]
Alam, S. N. [43 ,144 ]
Albuquerque, D. S. D. [125 ]
Aleksandrov, D. [91 ]
Alessandro, B. [62 ]
Alfanda, H. M. [6 ]
Molina, R. Alfaro [74 ]
Ali, B. [16 ]
Ali, Y. [14 ]
Alici, A. [10 ,27 ,57 ]
Alkin, A. [2 ,37 ]
Alme, J. [21 ]
Alt, T. [71 ]
Altenkamper, L. [21 ]
Altsybeev, I [116 ]
Anaam, M. N. [6 ]
Andrei, C. [51 ]
Andreou, D. [37 ]
Andronic, A. [147 ]
Angeletti, M. [37 ]
Anguelov, V [107 ]
Anson, C. [15 ]
Antinori, F. [60 ]
Antonioli, P. [57 ]
Apadula, N. [83 ]
Aphecetche, L. [118 ]
Appelshauser, H. [71 ]
Arcelli, S. [27 ]
Arnaldi, R. [62 ]
Arratia, M. [83 ]
Arsene, I. C. [20 ]
Arslandok, M. [107 ]
Augustinus, A. [37 ]
Averbeck, R. [110 ]
Aziz, S. [81 ]
Azmi, M. D. [16 ]
Badala, A. [59 ]
机构
[1] Yerevan Phys Inst Fdn, AI Alikhanyan Natl Sci Lab, Yerevan, Armenia
[2] Natl Acad Sci Ukraine, Bogolyubov Inst Theoret Phys, Kiev, Ukraine
[3] Ctr Astroparticle Phys & Space Sci CAPSS, Bose Inst, Dept Phys, Kolkata, India
[4] Budker Inst Nucl Phys, Novosibirsk, Russia
[5] Calif Polytech State Univ San Luis Obispo, San Luis Obispo, CA USA
[6] Cent China Normal Univ, Wuhan, Hubei, Peoples R China
[7] Ctr Calcul IN2P3, Lyon, France
[8] Ctr Aplicac Tecnol Gicas & Desarrollo Nucl CEADEN, Havana, Cuba
[9] Ctr Invest & Estudios Avanzados CINVESTAV, Mexico City, Mexico
[10] Ctr Fermi Museo Stor Fis & Ctr Studi & Ric Enrico, Rome, Italy
[11] Chicago State Univ, Chicago, IL USA
[12] China Inst Atom Energy, Beijing, Peoples R China
[13] Comenius Univ, Fac Math Phys & Informat, Bratislava, Slovakia
[14] Univ Islamabad, COMSATS, Islamabad, Pakistan
[15] Creighton Univ, Omaha, NE 68178 USA
[16] Aligarh Muslim Univ, Dept Phys, Aligarh, Uttar Pradesh, India
[17] Pusan Natl Univ, Dept Phys, Pusan, South Korea
[18] Sejong Univ, Dept Phys, Seoul, South Korea
[19] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA
[20] Univ Oslo, Dept Phys, Oslo, Norway
[21] Univ Bergen, Dept Phys & Technol, Bergen, Norway
[22] Univ Roma La Sapienza, Dipartimento Fis, Rome, Italy
[23] Sezione Ist Nazl Fis Nucl, Rome, Italy
[24] Univ & Sez INFN, Dipartimento Fis, Cagliari, Italy
[25] Univ & Sez INFN, Dipartimento Fis, Trieste, Italy
[26] Univ & Sez INFN, Dipartimento Fis, Turin, Italy
[27] Univ & Sez INFN, Dipartimento Fis & Astron, Bologna, Italy
[28] Univ & Sez INFN, Dipartimento Fis & Astron, Catania, Italy
[29] Univ & Sez INFN, Dipartimento Fis & Astron, Padua, Italy
[30] Univ & Grp Collegato, Dipartimento Fis ER Caianiello, Ist Nazl Fis Nucl, Salerno, Italy
[31] Politecn & Sez INFN, Dipartimento DISAT, Turin, Italy
[32] Univ Piemonte Orientale, Dipartimento Sci & Innovaz Tecnol, Alessandria, Italy
[33] Sez Torino, Ist Nazl Fis Nucl, Alessandria, Italy
[34] Univ Messina, Dipartimento Sci MIFT, Messina, Italy
[35] Dipartimento Interateneo Fis M Merlin, Bari, Italy
[36] Sezione Ist Nazl Fis Nucl, Bari, Italy
[37] European Org Nucl Res CERN, Geneva, Switzerland
[38] Univ Split, Fac Elect Engn Mech Engn & Naval Architecture, Split, Croatia
[39] Western Norway Univ Appl Sci, Fac Engn & Sci, Bergen, Norway
[40] Czech Tech Univ, Fac Nucl Sci & Phys Engn, Prague, Czech Republic
[41] Safarik Univ, Fac Sci, Kosice, Slovakia
[42] Goethe Univ Frankfurt, Frankfurt Inst Adv Studies, Frankfurt, Germany
[43] Fudan Univ, Shanghai, Peoples R China
[44] Gangneung Wonju Natl Univ, Kangnung, South Korea
[45] Gauhati Univ, Dept Phys, Gauhati, India
[46] Rheinische Friedrich Wilhelms Univ Bonn, Helmholtz Inst Strahlen & Kernphys, Bonn, Germany
[47] Helsinki Inst Phys HIP, Helsinki, Finland
[48] Univ Autonoma Puebla, High Energy Phys Grp, Puebla, Mexico
[49] Hiroshima Univ, Hiroshima, Japan
[50] Zentrum Technologietransfer & Telekommunikat ZIT, Hsch Worms, Worms, Germany
基金
英国科学技术设施理事会; 瑞典研究理事会; 俄罗斯基础研究基金会; 中国国家自然科学基金; 奥地利科学基金会; 美国能源部; 日本学术振兴会; 美国国家科学基金会; 新加坡国家研究基金会; 巴西圣保罗研究基金会; 俄罗斯科学基金会;
关键词
PARTICLES; PION;
D O I
10.1103/PhysRevC.103.055201
中图分类号
O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
The first measurements of the scattering parameters of Lambda K pairs in all three charge combinations (Lambda K+, Lambda K-, and Lambda K-S(0)) are presented. The results are achieved through a femtoscopic analysis of Lambda K correlations in Pb-Pb collisions at root s(NN) = 2.76 TeV recorded by ALICE at the Large Hadron Collider. The femtoscopic correlations result from strong final-state interactions and are fit with a parametrization allowing for both the characterization of the pair emission source and the measurement of the scattering parameters for the particle pairs. Extensive studies with the THERMINATOR 2 event generator provide a good description of the nonfemtoscopic background, which results mainly from collective effects, with unprecedented precision. Furthermore, together with HIJING simulations, this model is used to account for contributions from residual correlations induced by feed-down from particle decays. The extracted scattering parameters indicate that the strong force is repulsive in the Lambda K+ interaction and attractive in the Lambda K- interaction. The data hint that the Lambda K-S(0) interaction is attractive; however, the uncertainty of the result does not permit such a decisive conclusion. The results suggest an effect arising either from different quark-antiquark interactions between the pairs (s (s) over bar in Lambda K+ and u (u) over bar in Lambda K-) or from different net strangeness for each system (S = 0 for Lambda K+, and S = -2 for Lambda K-). Finally, the Lambda K systems exhibit source radii larger than expected from extrapolation from identical particle femtoscopic studies. This effect is interpreted as resulting from the separation in space-time of the single-particle Lambda and K source distributions.
引用
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页数:23
相关论文
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