TY - JOUR
T1 - Heavy QCD axion at Belle II
T2 - Displaced and prompt signals
AU - Bertholet, Emilie
AU - Chakraborty, Sabyasachi
AU - Loladze, Vazha
AU - Okui, Takemichi
AU - Soffer, Abner
AU - Tobioka, Kohsaku
N1 - Publisher Copyright: © 2022 authors. Published by the American Physical Society.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - The QCD axion is a well-motivated addition to the standard model to solve the strong CP problem. If the axion acquires mass dominantly from a hidden sector, it can be as heavy as O(1) GeV, and the decay constant can be as low as O(100) GeV without running into the axion quality problem. We propose new search strategies for such heavy QCD axions at the Belle II experiment, where the axions are expected to be produced via B→Ka. We find that a subsequent decay a→3π with a displaced vertex leads to a unique signal with essentially no background, and that a dedicated search can explore the range O(1-10) TeV of decay-constant values. We also show that a→γγ can cover a significant portion of currently unexplored region of 150ma500 MeV.
AB - The QCD axion is a well-motivated addition to the standard model to solve the strong CP problem. If the axion acquires mass dominantly from a hidden sector, it can be as heavy as O(1) GeV, and the decay constant can be as low as O(100) GeV without running into the axion quality problem. We propose new search strategies for such heavy QCD axions at the Belle II experiment, where the axions are expected to be produced via B→Ka. We find that a subsequent decay a→3π with a displaced vertex leads to a unique signal with essentially no background, and that a dedicated search can explore the range O(1-10) TeV of decay-constant values. We also show that a→γγ can cover a significant portion of currently unexplored region of 150ma500 MeV.
UR - http://www.scopus.com/inward/record.url?scp=85128707438&partnerID=8YFLogxK
U2 - https://doi.org/10.1103/PhysRevD.105.L071701
DO - https://doi.org/10.1103/PhysRevD.105.L071701
M3 - مقالة
SN - 2470-0010
VL - 105
JO - Physical Review D
JF - Physical Review D
IS - 7
M1 - L071701
ER -