Polarization in relativistic heavy ion collisions: a theoretical perspective

Becattini, F.

doi:10.1051/epjconf/201817107001

Cited by 7 publications

(11 citation statements)

References 23 publications

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“…We can see that the shapes of P x sgn(Y ) , P y sgn(Y ) , and P z are in analogy to sin φ p , − cos φ p , and − sin(2φ p ), respectively, as described by Eq. (12). The features of three quantities at two collision energies are quite similar.…”

Section: Numerical Results and Discussionmentioning

confidence: 83%

“…The space distribution of the vorticity field can be probed by the local Λ polarization as a function of the azimuthal angle φ p and the rapidity Y in momentum space, which is expected to have harmonic behaviors as in Eq. (12).…”

Section: Discussionmentioning

confidence: 99%

“…They can lead to the hadron polarization and spin alignment through spinorbit couplings [1][2][3][4][5] or spin-vorticity couplings [6][7][8][9], see Refs. [10][11][12] for recent reviews. The vorticity-related effects also include some chiral transport phenomena such as the chiral vortical effect [13] and the chiral vortical wave [14] as well as a change of the QCD phase diagram [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Px and Py in Eq. (12) quadrupole structure of ωz anisotropic transverse velocity (elliptic flow) local polarization, see Pz in Eq (12).…”

mentioning

confidence: 99%

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Probing vorticity structure in heavy-ion collisions by local Λ polarization

et al. 2018

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We study the local structure of the vorticity field and the Λ polarization in Au+Au collisions in the energy range √ sNN = 7.7-200 GeV and Pb+Pb collisions at √ sNN = 2760 GeV using A Multi-Phase Transport (AMPT) model. We focus on the vorticity field arising from the non-uniform expansion of the fireball, which gives the circular structure of the transverse vorticity ω ⊥ = (ωx, ωy) around the z direction as well as the quadrupole pattern of the longitudinal vorticity ωz in the transverse plane. As a consequence, the three components of the polarization vector P = (Px, Py, Pz) for Λ hyperons show harmonic behaviors as sgn(Y ) sin φp, −sgn(Y ) cos φp, and − sin(2φp), where φp and Y are the azimuthal angle and rapidity in momentum space. These patterns of the local Λ polarization are expected to be tested in future experiments.

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Section: Numerical Results and Discussionmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Px and Py in Eq. (12) quadrupole structure of ωz anisotropic transverse velocity (elliptic flow) local polarization, see Pz in Eq (12).…”

mentioning

confidence: 99%

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Probing vorticity structure in heavy-ion collisions by local Λ polarization

et al. 2018

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“…The comprehensive study of global polarization of hyperons and spin alignment of vector mesons can help us to probe the vorticity field [10][11][12][13][14][15] and, from the spin transport aspect, understand particle production mechanisms during hardronization [3]. For those reasons this topic is gaining increasing interest [16][17][18][19][20][21][22], and in particular it is recently demonstrated that the BNL Relativistic Heavy Ion Collider has produced the most vortical fluid with least viscosity [22].…”

Section: Introductionmentioning

confidence: 99%

Practical considerations for measuring global spin alignment of vector mesons in relativistic heavy ion collisions

Tang

Zhou

2018

Phys. Rev. C

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Global spin alignment of vector mesons is a sensitive probe of system vorticity and particle production mechanism in relativistic heavy ion collisions. The measurement of global spin alignment is gaining increasing interest and deserves careful considerations. In this paper, we lay out a few practical issues that need to be taken care of when measuring global spin alignment of vector mesons. They are, the correction for event plane resolution, reconciling measurements made with different event planes, the correction for the effect of finite acceptance in pseudorapidity, and the consideration for measuring the azimuthal angle dependence. Insights and methodologies offered in this paper will help experiments to measure the global spin alignment properly and accurately.

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