@article{8a8ee296b1f0426497c1fc91fffd366c,

title = "Reconstruction of Nearly Horizontal Muons in the HAWC Observatory",

abstract = "The volcanoes surrounding the HAWC observatory provide varying material depths from open sky to over 15 km of rock for nearly horizontal muon trajectories. The muon integral intensity as a function of material depth may be determined from the rate of muons as a function of arrival direction near the horizon. A Hough transform algorithm is used to identify nearly-horizontal muons traversing the HAWC observatory by finding a line in the 3d point cloud of PMT hits (xi,yi, and cti). The arrival direction of the muon can be estimated from this line. Background Extensive Air Shower (EAS) fragments are identified by the presence of a lateral extension of PMT hits in a plane normal to the muon candidate trajectory. A geometry-based simulation has been developed to improve and estimate arrival direction reconstruction resolution and effective area. A description of the reconstruction techniques and estimates of detector resolution, backgrounds, and effective area as a function of arrival direction, will be provided.",

author = "{the HAWC Collaboration} and Barber, {Ahron S.} and Kieda, {David B.} and {Wayne Springer}, R. and Abeysekara, {A. U.} and A. Albert and R. Alfaro and C. Alvarez and {\'A}lvarez, {J. D.} and {Angeles Camacho}, {J. R.} and Arteaga-Vel{\'a}zquez, {J. C.} and Arunbabu, {K. P.} and {Avila Rojas}, D. and {Ayala Solares}, {H. A.} and R. Babu and V. Baghmanyan and Barber, {A. S.} and {Becerra Gonzalez}, J. and E. Belmont-Moreno and BenZvi, {S. Y.} and D. Berley and C. Brisbois and Caballero-Mora, {K. S.} and T. Capistr{\'a}n and A. Carrami{\~n}ana and S. Casanova and O. Chaparro-Amaro and U. Cotti and J. Cotzomi and {Couti{\~n}o de Le{\'o}n}, S. and {De la Fuente}, E. and {de Le{\'o}n}, C. and L. Diaz-Cruz and {Diaz Hernandez}, R. and D{\'i}az-V{\'e}lez, {J. C.} and Dingus, {B. L.} and M. Durocher and DuVernois, {M. A.} and Ellsworth, {R. W.} and K. Engel and C. Espinoza and Fan, {K. L.} and K. Fang and {Fern{\'a}ndez Alonso}, M. and B. Fick and H. Fleischhack and Flores, {J. L.} and Fraija, {N. I.} and D. Garcia and Garc{\'i}a-Gonz{\'a}lez, {J. A.} and J. Lee",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s).; 37th International Cosmic Ray Conference, ICRC 2021 ; Conference date: 12-07-2021 Through 23-07-2021",

year = "2022",

month = mar,

day = "18",

language = "English",

volume = "395",

journal = "Proceedings of Science",

issn = "1824-8039",

publisher = "Sissa Medialab Srl",

}