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 polarization in peripheral collisions at moderately relativistic energies

Xie, Y.; Bleicher, Marcus; Stöcker, H.; Wang, D. J.; Csernai, L. P.

doi:10.1103/physrevc.94.054907

Cited by 56 publications

(49 citation statements)

References 43 publications

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“…Such effects have been included in many studies based on the hydrodynamical model [1][2][3][10][11][12][13][14][15][16][17][18][19][20], and some of these studies can indeed quantitatively reproduce the polarization of Λ hyperons measured by the STAR Collaboration [21]. Studies based on the fluid dynamical approach [12] and the transport model [22] also give results that agree with the experimental observation.…”

Section: Introductionsupporting

confidence: 73%

Λ hyperon polarization in relativistic heavy ion collisions from a chiral kinetic approach

Sun¹,

Ko²

2017

Phys. Rev. C

145

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Based on the chiral kinetic approach using initial conditions from a multiphase transport model, we study the spin polarizations of quarks and antiquarks in non-central heavy ion collisions at the Relativistic Heavy Ion Collider. Because of the non-vanishing vorticity field in these collisions, quarks and antiquarks are found to acquire appreciable spin polarizations in the direction perpendicular to the reaction plane. Converting quarks and antiquarks to hadrons via the coalescence model, we further calculate the spin polarizations of Lambda and anti-Lambda hyperons and find their values comparable to those measured in experiments by the STAR Collaboration.

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Section: Introductionsupporting

confidence: 73%

Λ hyperon polarization in relativistic heavy ion collisions from a chiral kinetic approach

Sun¹,

Ko²

2017

Phys. Rev. C

145

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“…These new measurements indicated that the vorticity field, if assumed to be responsible for the detailed structure in the Λ polarization, may have a very nontrivial local structure in the fireball. Indeed, it has been proposed from model simulations that the vorticity can be generated from different sources, leading to a novel local vortical structure and local polarization [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49]. The total Λ polarization is the superposition of them.…”

Section: Introductionmentioning

confidence: 99%

Feed-down effect on Λ spin polarization

Xia

Huang

et al. 2019

Phys. Rev. C

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We develop a theoretical framework to study the feed-down effect of higher-lying strange baryons on the spin polarization of the Λ hyperon. In this framework, we consider two-body decays through strong, electromagnetic, and weak processes and derive general formulas for the angular distribution and spin polarization of the daughter particle by adopting the helicity formalism. Using the realistic experimental data as input, we explore the feeddown contribution to the global and the local Λ polarizations and find that such a contribution suppresses the primordial Λ polarization, which is not strong enough to resolve the discrepancy between the current theoretical and the experimental results on the azimuthal-angle dependence of Λ polarization. Our paper may also be useful for the measurement of spin polarization of baryons heavier than Λ (e.g., Ξ − ) in future experiments.

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“…frame, and one can Lorentz boost it into 's rest frame by the following formula: The three components of the polarization 3-vectors, 2 (p x ,p y ) [or 2 0 (p x ,p y )], have different significance. As we pointed out in our earlier paper [19], the x and y components of polarization, 2 x and 2 x , in transverse momentum space [p x ,p y ] are rather trivial and form a symmetric dipole structure, which results in vanishing global polarization along the x and y direction in the participant c.m. frame.…”

mentioning

confidence: 99%

“…Afterwards, more experimental research was launched continuously, including nucleon collisions and heavy ion collisions [3][4][5][6][7][8][9]. Theoretical studies have also been under way synchronously with the experiments [10][11][12][13][14][15][16][17][18][19].…”

mentioning

confidence: 99%

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Global Λ polarization in high energy collisions

2017

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With a Yang-Mills flux-tube initial state and a high-resolution (3+1)D particle-in-cell relativistic (PICR) hydrodynamics simulation, we calculate the polarization for different energies. The origination of polarization in high energy collisions is discussed, and we find linear impact parameter dependence of the global polarization. Furthermore, the global polarization in our model decreases very quickly in the low energy domain, and the decline curve fits well the recent results of Beam Energy Scan (BES) program launched by the STAR Collaboration at the Relativistic Heavy Ion Collider (RHIC). The time evolution of polarization is also discussed.

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Λ polarization in peripheral collisions at moderately relativistic energies

Cited by 56 publications

References 43 publications

Λ hyperon polarization in relativistic heavy ion collisions from a chiral kinetic approach

Λ hyperon polarization in relativistic heavy ion collisions from a chiral kinetic approach

Feed-down effect on Λ spin polarization

Global Λ polarization in high energy collisions

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