Pith Number

pith:5HRPZFLU

pith:2026:5HRPZFLUOG644XMALFQHXEVT2Z

not attested not anchored not stored refs resolved

Tilted geometry of the pion emission source in Au+Au collisions in the RHIC Beam Energy Scan

STAR Collaboration

The tilt angle of the pion emission source in Au+Au collisions decreases rapidly with rising collision energy and depends strongly on pair transverse momentum.

arxiv:2605.15013 v1 · 2026-05-14 · nucl-ex

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\usepackage{pith}
\pithnumber{5HRPZFLUOG644XMALFQHXEVT2Z}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

Our results reveal a strong dependence of the tilt parameter on the pair transverse momentum, indicating that the apparent source geometry is strongly coupled to expansion dynamics. Moreover, we observe a rapid decrease of the tilt magnitude with increasing collision energy, consistent with the emission source approaching longitudinal boost invariance at higher energies.

C2weakest assumption

The azimuthally sensitive femtoscopy analysis assumes that the extracted tilt angle and freeze-out eccentricity faithfully reflect the true source geometry without large biases from detector acceptance, pair selection cuts, or the specific parametrization of the correlation function.

C3one line summary

The pion emission source in Au+Au collisions is tilted with magnitude decreasing rapidly as collision energy rises from 7.7 to 27 GeV, indicating departure from longitudinal boost invariance.

References

65 extracted · 65 resolved · 34 Pith anchors

[1] Hot QCD White Paper 2023

[2] Achenbachet al., The present and future of QCD, Nucl 2024

[3] Methods for analyzing anisotropic flow in relativistic nuclear collisions 1998 · arXiv:nucl-ex/9805001

[4] Torqued fireballs in relativistic heavy-ion collisions 2011 · arXiv:1011.3354

[5] Forward-backward eccentricity and participant-plane angle fluctuations and their influences on longitudinal dynamics of collective flow 2014 · arXiv:1403.6077

Formal links

2 machine-checked theorem links

Cited by

1 paper in Pith

Hadron polarization and equation of state at FAIR/RHIC-BES energies

Receipt and verification

First computed	2026-05-17T23:38:54.758058Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e9e2fc957471bdce5d8059607b92b3d67f4c04a8adad2064f29b9817f42156f0

Aliases

arxiv: 2605.15013 · arxiv_version: 2605.15013v1 · doi: 10.48550/arxiv.2605.15013 · pith_short_12: 5HRPZFLUOG64 · pith_short_16: 5HRPZFLUOG644XMA · pith_short_8: 5HRPZFLU

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/5HRPZFLUOG644XMALFQHXEVT2Z \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: e9e2fc957471bdce5d8059607b92b3d67f4c04a8adad2064f29b9817f42156f0

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "be1edee4daec5b05f82745956eaf2e52c4e01fa01b4b95ebb99f53abcecbb2e9",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "nucl-ex",
    "submitted_at": "2026-05-14T16:13:56Z",
    "title_canon_sha256": "47eda79dae5be3884a4410a4b9d2824516897947c9143531e407bbf62a6076ee"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.15013",
    "kind": "arxiv",
    "version": 1
  }
}