Asymmetric longitudinal flow decorrelations in proton-nucleus collisions

Wu, Xiang-Yu; Qin, Guang-You

doi:10.48550/arxiv.2109.03512

Cited by 4 publications

(4 citation statements)

References 62 publications

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“…To provide a comprehensive understanding of the polarization, in this work we concentrate on the studies of the polarization induced by SHE and the dependence of initial conditions and baryon diffusion. We utilize (3+1)dimensional CLVisc hydrodynamics framework [125][126][127] with the AMPT (A-Multi-Phase-Transport) initial model [128][129][130][131] and SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) initial condition [132][133][134][135][136][137][138] to simulate the dynamical evolution of QGP fireball. The SMASH initial condition, which includes the thickness effects of the nucleus, may provide extra useful information of QGP fireball in low energy region.…”

Section: Introductionmentioning

confidence: 99%

Local and global polarization of $Λ$ hyperons across RHIC-BES energies: the roles of spin hall effect, initial condition and baryon diffusion

Wu,

Yi,

Qin

et al. 2022

Preprint

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We perform a systematic study on the local and global spin polarization of Λ and Λ hyperons in relativistic heavy-ion collisions at beam energy scan energies via the (3+1)-dimensional CLVisc hydrodynamics model with AMPT and SMASH initial conditions. Following the quantum kinetic theory, we decompose the polarization vector as the parts induced by thermal vorticity, shear tensor and the spin Hall effect (SHE). We find that the polarization induced by SHE and the total polarization strongly depends on the initial conditions. At 7.7GeV, SHE gives a sizeable contribution and even flips the sign of the local polarization along the beam direction for AMPT initial condition, which is not observed for SMASH initial condition. Meanwhile, the local polarization along the out-of-plane direction induced by SHE with AMPT initial condition does not always increase with decreasing collision energies. Next, we find that the polarization along the beam direction is sensitive to the baryon diffusion coefficient, but the local polarization along the out-of-plane direction is not. Our results for the global polarization of Λ and Λ agree well with the STAR data. Interestingly, the global polarization of Λ is not always larger than that of Λ due to various competing effects. Our findings are helpful for understanding the polarization phenomenon and the detailed structure of quark-gluon plasma in relativistic heavy-ion collisions.

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Section: Introductionmentioning

confidence: 99%

Local and global polarization of $Λ$ hyperons across RHIC-BES energies: the roles of spin hall effect, initial condition and baryon diffusion

Wu,

Yi,

Qin

et al. 2022

Preprint

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“…Quantitative understanding of the many-body dynamics in UPC events poses big challenges to the theory community. First, it is known that in asymmetric systems boost-invariance is strongly broken [27][28][29][30][31]. Because of the largely different incoming energies between the quasireal photon γ * and the Pb nucleus, the γ * +Pb collision is highly asymmetric and the violation of boost invariance is expected to be even greater than that in p+Pb collisions.…”

Section: Introductionmentioning

confidence: 99%

Collectivity in Ultra-Peripheral Pb+Pb Collisions at the Large Hadron Collider

Zhao¹,

Shen²,

Schenke³

2022

Preprint

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We present the first full (3+1)D dynamical simulations of ultra-peripheral Pb+Pb collisions at the Large Hadron Collider. Extrapolating from p+Pb collisions, we explore whether a quasi-real photon γ * interacting with the lead nucleus in an ultra-peripheral collision can create a manybody system exhibiting fluid behavior. Assuming strong final-state interactions, we provide model results for charged hadron multiplicity, identified particle mean transverse momenta, and charged hadron anisotropic flow coefficients, and compare them with experimental data from the ALICE and ATLAS collaborations. The elliptic flow hierarchy between p+Pb and γ * +Pb collisions is dominated by the difference in longitudinal flow decorrelations and reproduces the experimental data well. We have demonstrated that our theoretical framework provides a quantitative tool to study particle production and collectivity for all system sizes, ranging from central heavy-ion collisions to small asymmetric collision systems at the Relativistic Heavy-Ion Collider and the Large Hadron Collider and even at the future Electron-Ion Collider.

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“…[12]. The lack of boost-invariance [18][19][20][21][22] invalidates approximating of the mid-rapidity physics by the physics of the forward region. In particular only a small fraction of particles is produced in the forward region.…”

Section: Introductionmentioning

confidence: 99%

CGC for ultra-peripheral Pb+Pb collisions at the Large Hadron Collider: a more realistic calculation

Duan

Kovner

Skokov

2022

J. High Energ. Phys.

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We provide the first calculation of two-gluon production at mid-rapidity in ultra-peripheral collisions in the Color Glass Condensate framework. To estimate systematic uncertainty associated with poor understanding of the wave function of the nearly real photon, we consider two diametrically different models: the dilute quark-antiquark dipole approximation and a vector meson, in which color charge density is approximated by McLerran-Venugopalan model. In the experimentally relevant range, the target nucleus can be faithfully approximated by a highly saturated state. This simplification enables us to perform efficient numerical simulations and extract the two-gluon correlation functions and the associated azimuthal harmonics.

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Asymmetric longitudinal flow decorrelations in proton-nucleus collisions

Cited by 4 publications

References 62 publications

Local and global polarization of $Λ$ hyperons across RHIC-BES energies: the roles of spin hall effect, initial condition and baryon diffusion

Local and global polarization of $Λ$ hyperons across RHIC-BES energies: the roles of spin hall effect, initial condition and baryon diffusion

Collectivity in Ultra-Peripheral Pb+Pb Collisions at the Large Hadron Collider

CGC for ultra-peripheral Pb+Pb collisions at the Large Hadron Collider: a more realistic calculation

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