Spin alignment measurements of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi>K</mml:mi><mml:mrow><mml:mo>*</mml:mo><mml:mn>0</mml:mn></mml:mrow></mml:msup><mml:mo stretchy="false">(</mml:mo><mml:mn>892</mml:mn><mml:mo stretchy="false">)</mml:mo></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>ϕ</mml:mo><mml:mo stretchy="false">(</mml:mo><mml:mn>1020</mml:mn><mml:mo stretchy="false"

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doi:10.1103/physrevc.77.061902

Cited by 60 publications

(28 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This result is analogous to the spin alignment of the vector meson [7][8][9][10]. If the parent is polarized, we expect ∆ < 1/2, and the daughter's angular distribution becomes anisotropic.…”

Section: Spin Polarization In Two-body Decaymentioning

confidence: 69%

“…From a given initial spin-density-matrix ρ i , we can calculate the spin-density matrix of final-state ρ f by Eq. (8). Then, the angular distribution of D in the RFP can be determined by…”

Section: Spin Polarization In Two-body Decaymentioning

confidence: 99%

“…where P P is the polarization magnitude of P. Using Eqs. (8) and (13), we obtain the final spin-density matrix as…”

Section: Spin Polarization In Two-body Decaymentioning

confidence: 99%

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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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Section: Spin Polarization In Two-body Decaymentioning

confidence: 69%

Section: Spin Polarization In Two-body Decaymentioning

confidence: 99%

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Feed-down effect on Λ spin polarization

Xia

Huang

et al. 2019

Phys. Rev. C

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show abstract

“…15. Keep in mind that the φ meson has always been a very interesting hadron in previous studies since its mass is close to a proton but it is a multistrange meson [3,[50][51][52][53][54]. This could be understood from the parton's v n in the same condition: v n of s quark displays a slight deviation from the u (d) quarks (not shown here).…”

Section: Number-of-constituent-quark Scaling Of V N At Relativistimentioning

confidence: 90%

Initial fluctuation effect on harmonic flows in high-energy heavy-ion collisions

Han

et al. 2011

Phys. Rev. C

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Within the framework of a multiphase transport model, harmonic flows v n (n = 2, 3, and 4) are investigated for Au-Au collisions at √ s NN = 200 GeV and Pb-Pb collisions at √ s NN = 2.76 TeV. The event-by-event geometry fluctuations significantly contribute to harmonic flows. Triangular flow (v 3 ) originates from initial triangularity (ε 3 ) and is developed by partonic interactions. The conversion efficiency (v n /ε n ) decreases with the harmonic order and increases with the partonic interaction cross section. A mass ordering in the low-p T region and a constituent quark number scaling in the middle-p T region seem to work roughly for nth harmonic flows at both energies. All features of harmonic flows show similar qualitative behaviors at BNL Relativistic Heavy Ion Collider and CERN Large Hadron Collider energies, which implies that the formed partonic matters are similar at the two energies.

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“…The included channels of polarized decays are φ → K +K (branching ratio ∼ 83%) and Λ → p + π − and n + π 0 (branching ratio ∼ 100%). While experimentally the direction of the angular momentum is often estimated by the normal of the reconstructed event plane [8,9], we directly calculate the initial angular momentum vector of the participant nucleons event-by-event in the AMPT calculations. All results in this study are for minimum bias (impact parameter from 0 to 15.6 fm) Au+Au collisions.…”

mentioning

confidence: 99%

Effects of finite coverage on global polarization observables in heavy ion collisions

et al. 2018

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In non-central relativistic heavy ion collisions, the created matter possesses a large initial orbital angular momentum. Particles produced in the collisions could be polarized globally in the direction of the orbital angular momentum due to spin-orbit coupling. Recently, the STAR experiment has presented polarization signals for Λ hyperons and possible spin alignment signals for φ mesons.Here we discuss the effects of finite coverage on these observables. The results from a multi-phase transport and a toy model both indicate that a pseudorapidity coverage narrower than |η| <∼ 1 will generate a larger value for the extracted φ-meson ρ00 parameter; thus a finite coverage can lead to an artificial deviation of ρ00 from 1/3. We also show that a finite η and pT coverage affect the extracted pH parameter for Λ hyperons when the real pH value is non-zero. Therefore proper corrections are necessary to reliably quantify the global polarization with experimental observables.

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Spin alignment measurements of theK*0(892)andϕ(1020

Abstract: is consistent with that in p+p collisions, ρ00 = 0.39 ± 0.03 (stat) ± 0.06 (syst), also measured in this work. The measurements thus constrain the possible size of polarization phenomena in the production dynamics of vector mesons.

Cited by 60 publications

References 56 publications

Feed-down effect on Λ spin polarization

Feed-down effect on Λ spin polarization

Initial fluctuation effect on harmonic flows in high-energy heavy-ion collisions

Effects of finite coverage on global polarization observables in heavy ion collisions

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