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Search for the QCD Critical Point by Transverse Velocity Dependence of Anti-deuteron to Deuteron Ratio
Nuclear Theory · Submitted 11 Dec 2018
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Surprisingly, we only observe a negative slope in $\beta_T$ dependence of $\bar{d}/d$ ratio at $\sqrt{s_{NN}}$ = 19.6 GeV, which indicates the trajectory evolution has passed through the critical region.
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The abstract, sentence by sentence
We propose the transverse velocity ($\beta_T$) dependence of the anti-deuteron to deuteron ratio as a new observable to search for the QCD critical point in heavy-ion collisions. The QCD critical point can attract the system evolution trajectory in the QCD phase diagram, which is known as focusing effect. To quantify this effect, we employ thermal model and hadronic transport model to simulate the dynamical particle emission along a hypothetical focusing trajectory near critical point. We found the focusing effect can lead to anomalous $\beta_T$ dependence of $\bar{p}/p$, $\bar{d}/d$ and $^3\overline{\text{He}}/^3\text{He}$ ratios. We examined the $\beta_T$ dependence of $\bar{p}/p$ and $\bar{d}/d$ ratios of central Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7 to 200 GeV measured by the STAR experiment at RHIC. Surprisingly, we only observe a negative slope in $\beta_T$ dependence of $\bar{d}/d$ ratio at $\sqrt{s_{NN}}$ = 19.6 GeV, which indicates the trajectory evolution has passed through the critical region. In the future, we could constrain the location of the critical point and/or width of the critical region by making precise measurements on the $\beta_T$ dependence of $\bar{d}/d$ ratio at different energies and rapidity.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We propose the transverse velocity ($\beta_T$) dependence of the anti-deuteron to deuteron ratio as a new observable to search for the QCD critical point in heavy-ion collisions. | contribution 1.00 | 0.73 | 0.12 | speculative 0.43 |
| s1 | The QCD critical point can attract the system evolution trajectory in the QCD phase diagram, which is known as focusing effect. | background 1.00 | 0.05 | 0.03 | asserted 1.00 |
| s2 | To quantify this effect, we employ thermal model and hadronic transport model to simulate the dynamical particle emission along a hypothetical focusing trajectory near critical point. | method 1.00 | 0.90 | 0.03 | asserted 0.96 |
| s3 | We found the focusing effect can lead to anomalous $\beta_T$ dependence of $\bar{p}/p$, $\bar{d}/d$ and $^3\overline{\text{He}}/^3\text{He}$ ratios. | result 1.00 | 0.95 | 0.19 | asserted 1.00 |
| s4 | We examined the $\beta_T$ dependence of $\bar{p}/p$ and $\bar{d}/d$ ratios of central Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7 to 200 GeV measured by the STAR experiment at RHIC. | method 0.80 | 0.69 | 0.03 | asserted 0.99 |
| s5 | Surprisingly, we only observe a negative slope in $\beta_T$ dependence of $\bar{d}/d$ ratio at $\sqrt{s_{NN}}$ = 19.6 GeV, which indicates the trajectory evolution has passed through the critical region. | result 0.76 | 0.94 | 0.79 | asserted 0.62 |
| s6 | In the future, we could constrain the location of the critical point and/or width of the critical region by making precise measurements on the $\beta_T$ dependence of $\bar{d}/d$ ratio at different energies and rapidity. | future work 1.00 | 0.04 | 0.08 | hedged possibility 1.00 |
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The paper
Original abstract
We propose the transverse velocity ($\beta_T$) dependence of the anti-deuteron to deuteron ratio as a new observable to search for the QCD critical point in heavy-ion collisions. The QCD critical point can attract the system evolution trajectory in the QCD phase diagram, which is known as focusing effect. To quantify this effect, we employ thermal model and hadronic transport model to simulate the dynamical particle emission along a hypothetical focusing trajectory near critical point. We found the focusing effect can lead to anomalous $\beta_T$ dependence of $\bar{p}/p$, $\bar{d}/d$ and $^3\overline{\text{He}}/^3\text{He}$ ratios. We examined the $\beta_T$ dependence of $\bar{p}/p$ and $\bar{d}/d$ ratios of central Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7 to 200 GeV measured by the STAR experiment at RHIC. Surprisingly, we only observe a negative slope in $\beta_T$ dependence of $\bar{d}/d$ ratio at $\sqrt{s_{NN}}$ = 19.6 GeV, which indicates the trajectory evolution has passed through the critical region. In the future, we could constrain the location of the critical point and/or width of the critical region by making precise measurements on the $\beta_T$ dependence of $\bar{d}/d$ ratio at different energies and rapidity.
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References
How the literature uses it
5 arXiv papers cite this in 5 sentences
Papers citing it · 4 sentences without a confident label
Cites it as background 1 paper
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Many efforts have been made to find the signature of the CP, theoretically [ref] and experimentally [ref] .
Effects of centrality fluctuation and deuteron formation on proton number cumulant in Au+Au collisions at $\sqrt{s_\mathrm{NN}}$ = 3 GeV from JAM model · Introduction · 0.91
What it cites · 13 sentences without a confident label
Uses data or values from 2 papers
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The $p_T$ spectra of $p(p̅)$ and $d(d̅)$ at mid-rapidity have been measured in Au+Au collisions by the STAR experiment at RHIC BES-I [ref] with energies $=$ 7.7-200 GeV.
Beam energy dependence of $d$ and $\bar{d}$ productions in Au+Au collisions at RHIC · The QCD critical point focusing effect · 0.93
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The $p_T$ spectra of $p(p̅)$ and $d(d̅)$ at mid-rapidity have been measured in Au+Au collisions by the STAR experiment at RHIC BES-I [ref] with energies $=$ 7.7-200 GeV.
Beam energy dependence of (anti-)deuteron production in Au+Au collisions at RHIC · The QCD critical point focusing effect · 0.93
Cites as background 3 papers
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Theoretically, many efforts have been made to locate the critical point in Lattice QCD [ref] and models [ref] , but its position and even the existence is still not confirmed yet.
Scale for the Phase Diagram of Quantum Chromodynamics · Introduction · 0.95
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Theoretically, many efforts have been made to locate the critical point in Lattice QCD [ref] and models [ref] , but its position and even the existence is still not confirmed yet.
Conserved Charge Fluctuations from Lattice QCD and the Beam Energy Scan · Introduction · 0.95
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Theoretically, many efforts have been made to locate the critical point in Lattice QCD [ref] and models [ref] , but its position and even the existence is still not confirmed yet.
QCD phase diagram: an overview · Introduction · 0.95
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