First Detection of the Baryon Acoustic Oscillation (BAO) Feature in the 3-Point Correlation Function of DESI DR1 Luminous Red Galaxies

Journal Article · Wed Feb 18 00:00:00 EST 2026 · No journal information

OSTI ID:3020050

Kamalinejad, Farshad ^[1]; Slepian, Zachary ^[1]; Krolewski, Alex ^[2]; Greco, Alessandro ^[1]; Leonard, William Ortolá ^[1]; Chellino, Jessica ^[1]; Reinhard, Matthew ^[1]; Fernández-García, Elena ^[3]; Prada, Francisco ^[3]; Aguilar, J. ^[4]; Ahlen, S. ^[5]; Anand, A. ^[4]; Bebek, C. ^[4]; Bianchi, D. ^[6]; Brooks, D. ^[7]; Claybaugh, T. ^[4]; Cuceu, A. ^[4]; Dawson, K. S. ^[8]; de la Macorra, A. ^[9]; Demina, R. ^[10] ; Doel, P. ^[7]; Edelstein, J. ^[11]; Forero-Romero, J. E. ^[12]; Gaztañaga, E. ^[13]; Gontcho A. Gontcho, S. ^[14]; Gutierrez, G. ^[15]; Herrera-Alcantar, H. K. ^[16]; Honscheid, K. ^[17]; Howlett, C. ^[18]; Huterer, D. ^[19]; Ishak, M. ^[20]; Joyce, R. ^[21]; Juneau, S. ^[21]; Kirkby, D. ^[22]; Kisner, T. ^[4]; Kremin, A. ^[4]; Lahav, O. ^[7]; Lamman, C. ^[23]; Landriau, M. ^[4]; Le Guillou, L. ^[24]; Manera, M. ^[25]; Meisner, A. ^[21]; Miquel, R. ^[26]; Moustakas, J. ^[27]; Muñoz-Gutiérrez, A. ^[9]; Newman, J. A. ^[28]; Percival, W. J. ^[29]; Poppett, C. ^[30]; Pérez-Ràfols, I. ^[31]; Samushia, L. ^[32]; Sanchez, E. ^[33]; Schlegel, D. ^[4]; Schubnell, M. ^[19]; Seo, H. ^[34]; Silber, J. ^[4]; Sprayberry, D. ^[21]; Tarlé, G. ^[35]; Weaver, B. A. ^[21]; Zhao, C. ^[36]; Zou, H. ^[37]

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1. Florida U.
2. U. Waterloo (main); Waterloo U., IQC
3. Granada U., Theor. Phys. Astrophys.
4. LBL, Berkeley
5. Boston U.
6. Milan U.; Brera Observ.
7. University Coll. London
8. Utah U.
9. UNAM, Mexico
10. Rochester U.
11. UC, Berkeley (main); UC, Berkeley, Math. Dept.
12. Andes U., Bogota
13. Barcelona, IEEC; Portsmouth U., ICG; ICE, Bellaterra
14. Virginia U.
15. Fermilab
16. Paris, Inst. Astrophys.; IRFU, Saclay
17. Chicago U., KICP; Ohio State U.
18. Queensland U.
19. Michigan U., MCTP; Syracuse U.; Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.
20. U. Texas, Dallas
21. Natl. Solar Observ., Tucson
22. UC, Irvine
23. Ohio State U.
24. LPNHE, Paris
25. Barcelona, IFAE; Barcelona, Autonoma U.
26. ICREA, Barcelona; Barcelona, IFAE
27. Siena Coll., Loudonville
28. Pittsburgh U.
29. Waterloo U., IQC; Perimeter Inst. Theor. Phys.; U. Waterloo (main)
30. LBL, Berkeley; UC, Berkeley (main); UC, Berkeley, Math. Dept.
31. Barcelona, Polytechnic U.
32. Kansas State U.; Ilia State U.
33. Madrid, CIEMAT
34. Ohio U., Athens
35. Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.
36. Tsinghua U., Beijing
37. Beijing Observ.

We present the first detection of the 3-Point Correlation Function (3PCF) Baryon Acoustic Oscillation (BAO) signal from the DESI Data Release 1 (DR1) sample of Luminous Red Galaxies (LRGs), which contains over 2.1 million galaxies. Our analysis is based on a tree-level redshift-space bispectrum template, which is then transformed to position space using the Fast Fourier Transform on Logarithmic scales (FFTLog) algorithm. We detect the BAO feature with a significance of approximately $8.1σ$ using the EZmock covariance matrix and $8.5σ$ using the analytical covariance matrix, for the full LRG redshift range ($0.4

• Research Organization: Syracuse U.; Queensland U.; Beijing Observ.; Rochester U.; Andes U., Bogota; ICREA, Barcelona; UC, Berkeley, Math. Dept.; Paris, Inst. Astrophys.; UNAM, Mexico; IRFU, Saclay; Natl. Solar Observ., Tucson; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); UC, Berkeley (main); Boston U.; KEK, Tsukuba; Barcelona, Autonoma U.; Siena Coll., Loudonville; Pittsburgh U.; Hiroshima Shudo U.; Utah U.; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); LPNHE, Paris; U. Texas, Dallas; ICE, Bellaterra; Florida U.; Michigan U.; Tsinghua U., Beijing; Portsmouth U., ICG; UC, Irvine; Waterloo U., IQC; Granada U., Theor. Phys. Astrophys.; Ohio State U.; Michigan U., MCTP; Virginia U.; U. Waterloo (main); Barcelona, Polytechnic U.; Chicago U., KICP; Milan U.; University Coll. London; Ilia State U.; Barcelona, IFAE; Barcelona, IEEC; Kansas State U.; Perimeter Inst. Theor. Phys.; Madrid, CIEMAT; Brera Observ.; Ohio U., Athens
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: 89243024CSC000002
• OSTI ID: 3020050
• Report Number(s): FERMILAB-PUB-26-0107-PPD; oai:inspirehep.net:3121404; arXiv:2602.16134
• Journal Information: No journal information, Journal Name: No journal information
• Country of Publication: United States
• Language: English