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Spin alignment measurement of vector mesons produced in high energy collisions
Mohanty, Bedangadas1; Kundu, Sourav2; Singha, Subhash3; Singh, Ranbir1
Corresponding AuthorMohanty, Bedangadas(bedanga@niser.ac.in)
2021-12-21
Source PublicationMODERN PHYSICS LETTERS A
ISSN0217-7323
Volume36Issue:39Pages:23
AbstractThis paper covers the recent experimental development on spin alignment measurements of K*(0) and phi vector mesons in heavy-ion and pp collisions at RHIC and LHC energies. Measurements in e(+)e(-) collisions at LEP energies are also discussed. Spin alignment of vector mesons is studied by measuring the second diagonal element rho(00) of spin density matrix. The spin density matrix element rho(00) is obtained by measuring the angular distribution of vector meson decay daughter with respect to the quantization axis in vector meson rest frame. Measured rho(00) values for vector mesons are found to be larger than 1/3 at high momentum in e(+)e(-) collisions at LEP energies, suggesting the preferential production of vector meson with helicity zero state from the fragmentation process. The rho(00) values are found to be smaller than 1/3 (rho(00) = 1/3 implies no spin alignment) for K*(0) and phi vector mesons at low transverse momentum in Pb{Pb collisions at root s(NN) = 2:76 TeV. These observations are qualitatively consistent with the expectation from models which attribute the spin alignment effect due to polarization of quarks in the presence of large initial angular momentum in noncentral heavy-ion collisions and its subsequent hadronization by the process of recombination. No significant spin alignment effect is observed for K-S(0) (spin = 0) in mid-central Pb-Pb collisions and for vector mesons in pp collisions. However, the preliminary results of rho(00) for phi mesons are larger than 1/3 at intermediate p(T) in Au-Au collisions at RHIC energies and can be attributed to the presence of phi meson field. Although there is evidence of spin alignment effect of vector mesons in heavy-ion collisions but the measured effect is surprisingly larger in context of hyperon polarization. Therefore, these results will trigger further theoretical study.
KeywordSpin alignment vector meson rho(00) heavy-ion
DOI10.1142/S0217732321300263
Indexed BySCI
Language英语
Funding ProjectJ C Bose Fellowship from Department of Science of Technology, Government of India ; Research in Basic Sciences project from Department of Atomic Energy, Government of India ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB34000000]
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS KeywordGLOBAL POLARIZATION ; QUARK FRAGMENTATION ; DENSITY-MATRIX ; HADRONS ; LAMBDA
WOS SubjectAstronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields ; Physics, Mathematical
WOS IDWOS:000739878000004
PublisherWORLD SCIENTIFIC PUBL CO PTE LTD
Funding OrganizationJ C Bose Fellowship from Department of Science of Technology, Government of India ; Research in Basic Sciences project from Department of Atomic Energy, Government of India ; Strategic Priority Research Program of Chinese Academy of Sciences
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Document Type期刊论文
Identifierhttp://119.78.100.186/handle/113462/142472
Collection中国科学院近代物理研究所
Corresponding AuthorMohanty, Bedangadas
Affiliation1.Natl Inst Sci Educ & Res, Sch Phys Sci, HBNI, Jatni 752050, India
2.CERN, Expt Phys Dept, CH-1211 Geneva 23, Switzerland
3.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China
Recommended Citation
GB/T 7714
Mohanty, Bedangadas,Kundu, Sourav,Singha, Subhash,et al. Spin alignment measurement of vector mesons produced in high energy collisions[J]. MODERN PHYSICS LETTERS A,2021,36(39):23.
APA Mohanty, Bedangadas,Kundu, Sourav,Singha, Subhash,&Singh, Ranbir.(2021).Spin alignment measurement of vector mesons produced in high energy collisions.MODERN PHYSICS LETTERS A,36(39),23.
MLA Mohanty, Bedangadas,et al."Spin alignment measurement of vector mesons produced in high energy collisions".MODERN PHYSICS LETTERS A 36.39(2021):23.
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