Search for the dark photon in B 0 → A′A′, A′ → e + e −, μ + μ −, and π + π − decays at Belle

Standard

Search for the dark photon in B ⁰ → A′A′, A′ → e ⁺ e ⁻, μ ⁺ μ ⁻, and π ⁺ π ⁻ decays at Belle. / The BELLE collaboration.

In: Journal of High Energy Physics, Vol. 2021, No. 4, 191, 04.2021.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{e18d4d74563f4ea5b666c4c7dfbf8b30,

title = "Search for the dark photon in B 0 → A′A′, A′ → e + e −, μ + μ −, and π + π − decays at Belle",

abstract = "We present a search for the dark photon A′ in the B0 → A′A′ decays, where A′ subsequently decays to e+e−, μ+μ−, and π+π−. The search is performed by analyzing 772 × 106BB¯ events collected by the Belle detector at the KEKB e+e− energy-asymmetric collider at the ϒ(4S) resonance. No signal is found in the dark photon mass range 0.01 GeV/c2 ≤ mA′ ≤ 2.62 GeV/c2, and we set upper limits of the branching fraction of B0 → A′A′ at the 90% confidence level. The products of branching fractions, ℬ(B0→A′A′)×ℬ(A′→e+e−)2 and ℬ(B0→A′A′)×ℬ(A′→μ+μ−)2, have limits of the order of 10−8 depending on the A′ mass. Furthermore, considering A′ decay rate to each pair of charged particles, the upper limits of ℬ (B→ A′ A′) are of the order of 10−8–10−5. From the upper limits of ℬ (B→ A′ A′) , we obtain the Higgs portal coupling for each assumed dark photon and dark Higgs mass. The Higgs portal couplings are of the order of 10−2–10−1 at mh′≃mB0 ± 40 MeV/c2 and 10−1–1 at mh′≃mB0 ± 3 GeV/c2.",

keywords = "B physics, Beyond Standard Model, e+-e- Experiments, Rare decay",

author = "{The BELLE collaboration} and Park, {S. H.} and Kwon, {Y. J.} and I. Adachi and H. Aihara and {Al Said}, S. and Asner, {D. M.} and H. Atmacan and T. Aushev and R. Ayad and V. Babu and P. Behera and J. Bennett and M. Bessner and V. Bhardwaj and B. Bhuyan and T. Bilka and J. Biswal and G. Bonvicini and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and M. Campajola and L. Cao and D. {\v C}ervenkov and Chang, {M. C.} and P. Chang and A. Chen and Cheon, {B. G.} and K. Chilikin and Cho, {H. E.} and K. Cho and Cho, {S. J.} and Choi, {S. K.} and Y. Choi and S. Choudhury and D. Cinabro and S. Cunliffe and S. Das and N. Dash and S. Eidelman and D. Epifanov and A. Garmash and K. Gudkova and P. Krokovny and D. Matvienko and A. Sokolov and A. Vinokurova and V. Vorobyev and V. Zhilich and V. Zhulanov",

year = "2021",

month = apr,

doi = "10.1007/JHEP04(2021)191",

language = "English",

volume = "2021",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

publisher = "Springer US",

number = "4",

}

RIS

TY - JOUR

T1 - Search for the dark photon in B 0 → A′A′, A′ → e + e −, μ + μ −, and π + π − decays at Belle

AU - The BELLE collaboration

AU - Park, S. H.

AU - Kwon, Y. J.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Atmacan, H.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Behera, P.

AU - Bennett, J.

AU - Bessner, M.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bilka, T.

AU - Biswal, J.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Campajola, M.

AU - Cao, L.

AU - Červenkov, D.

AU - Chang, M. C.

AU - Chang, P.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, H. E.

AU - Cho, K.

AU - Cho, S. J.

AU - Choi, S. K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Cunliffe, S.

AU - Das, S.

AU - Dash, N.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Garmash, A.

AU - Gudkova, K.

AU - Krokovny, P.

AU - Matvienko, D.

AU - Sokolov, A.

AU - Vinokurova, A.

AU - Vorobyev, V.

AU - Zhilich, V.

AU - Zhulanov, V.

PY - 2021/4

Y1 - 2021/4

N2 - We present a search for the dark photon A′ in the B0 → A′A′ decays, where A′ subsequently decays to e+e−, μ+μ−, and π+π−. The search is performed by analyzing 772 × 106BB¯ events collected by the Belle detector at the KEKB e+e− energy-asymmetric collider at the ϒ(4S) resonance. No signal is found in the dark photon mass range 0.01 GeV/c2 ≤ mA′ ≤ 2.62 GeV/c2, and we set upper limits of the branching fraction of B0 → A′A′ at the 90% confidence level. The products of branching fractions, ℬ(B0→A′A′)×ℬ(A′→e+e−)2 and ℬ(B0→A′A′)×ℬ(A′→μ+μ−)2, have limits of the order of 10−8 depending on the A′ mass. Furthermore, considering A′ decay rate to each pair of charged particles, the upper limits of ℬ (B→ A′ A′) are of the order of 10−8–10−5. From the upper limits of ℬ (B→ A′ A′) , we obtain the Higgs portal coupling for each assumed dark photon and dark Higgs mass. The Higgs portal couplings are of the order of 10−2–10−1 at mh′≃mB0 ± 40 MeV/c2 and 10−1–1 at mh′≃mB0 ± 3 GeV/c2.

AB - We present a search for the dark photon A′ in the B0 → A′A′ decays, where A′ subsequently decays to e+e−, μ+μ−, and π+π−. The search is performed by analyzing 772 × 106BB¯ events collected by the Belle detector at the KEKB e+e− energy-asymmetric collider at the ϒ(4S) resonance. No signal is found in the dark photon mass range 0.01 GeV/c2 ≤ mA′ ≤ 2.62 GeV/c2, and we set upper limits of the branching fraction of B0 → A′A′ at the 90% confidence level. The products of branching fractions, ℬ(B0→A′A′)×ℬ(A′→e+e−)2 and ℬ(B0→A′A′)×ℬ(A′→μ+μ−)2, have limits of the order of 10−8 depending on the A′ mass. Furthermore, considering A′ decay rate to each pair of charged particles, the upper limits of ℬ (B→ A′ A′) are of the order of 10−8–10−5. From the upper limits of ℬ (B→ A′ A′) , we obtain the Higgs portal coupling for each assumed dark photon and dark Higgs mass. The Higgs portal couplings are of the order of 10−2–10−1 at mh′≃mB0 ± 40 MeV/c2 and 10−1–1 at mh′≃mB0 ± 3 GeV/c2.

KW - B physics

KW - Beyond Standard Model

KW - e+-e- Experiments

KW - Rare decay

UR - http://www.scopus.com/inward/record.url?scp=85104718575&partnerID=8YFLogxK

U2 - 10.1007/JHEP04(2021)191

DO - 10.1007/JHEP04(2021)191

M3 - Article

AN - SCOPUS:85104718575

VL - 2021

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 4

M1 - 191

ER -

ID: 28446372