TY  - JOUR
AU  - BABAR Collaboration (Lees, J. P. et al
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
PY  - 2022
DA  - 2022//
TI  - Search for Darkonium in e(+) e(-) Collisions
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 021802
EP  - 7pp
VL  - 128
IS  - 2
PB  - Amer Physical Soc
AB  - Collider searches for dark sectors, new particles interacting only feebly with ordinary matter, have largely focused on identifying signatures of new mediators, leaving much of dark sector structures unexplored. In particular, the existence of dark matter bound states (darkonia) remains to be investigated. This possibility could arise in a simple model in which a dark photon (A') is light enough to generate an attractive force between dark fermions. We report herein a search for a J(PC) = 1(--) darkonium state, the Upsilon(D), produced in the reaction e(+) e(-) -> gamma Upsilon(D), Upsilon(D) -> A'A'A', where the dark photons subsequently decay into pairs of leptons or pions, using 514 fb(-1) of data collected with the BABAR detector. No significant signal is observed, and we set bounds on the gamma – A' kinetic mixing as a function of the dark sector coupling constant for 0.001 < m(A)' < 3.16 GeV and 0.05 < m(Upsilon D) < 9.5 GeV.
SN  - 0031-9007
UR  - https://arxiv.org/abs/2106.08529
UR  - https://doi.org/10.1103/PhysRevLett.128.021802
DO  - 10.1103/PhysRevLett.128.021802
LA  - English
N1  - WOS:000747228900007
ID  - BABARCollaborationLees_etal2022
ER  -