Search for the dark photon in B-0 -> A ' A ', A ' -> e(+)e(-), mu(+)mu(-), and pi(+)pi(-) decays at Belle
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10439863" target="_blank" >RIV/00216208:11320/21:10439863 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=tbUDwI7Ut2" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=tbUDwI7Ut2</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/JHEP04(2021)191" target="_blank" >10.1007/JHEP04(2021)191</a>
Alternative languages
Result language
angličtina
Original language name
Search for the dark photon in B-0 -> A ' A ', A ' -> e(+)e(-), mu(+)mu(-), and pi(+)pi(-) decays at Belle
Original language description
We present a search for the dark photon A in the B-0 -> A ' A ' decays, where A ' subsequently decays to e(+)e(-), mu (+)mu (-), and pi (+)pi (-). The search is performed by analyzing 772 x 10(6)BB<overbar></mml:mover> events collected by the Belle detector at the KEKB e(+)e(-) energy-asymmetric collider at the Upsilon (4S) resonance. No signal is found in the dark photon mass range 0.01 GeV/c(2) <= m(A ') <= 2.62 GeV/c(2), and we set upper limits of the branching fraction of B-0 -> A ' A ' at the 90% confidence level. The products of branching fractions, B<mml:mfenced close=")" open="(">B0 -> A ' A '</mml:mfenced>xB<mml:mfenced close=")" open="(">A ' -> e+e-</mml:mfenced>2 and B<mml:mfenced close=")" open="(">B0 -> A ' A '</mml:mfenced>xB<mml:mfenced close=")" open="(">A ' -> mu+mu-</mml:mfenced>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<mml:mfenced close=")" open="(">B0 -> A ' A '</mml:mfenced> are of the order of 10(-8)-10(-5). From the upper limits of B<mml:mfenced close=")" open="(">B0 -> A ' A '</mml:mfenced>, 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 ' similar or equal to mB0 +/- 40 MeV/c(2) and 10(-1)-1 at mh ' <mml:mo>similar or equal to mB0 +/- 3 GeV/c(2).<fig id="Figa" position="anchor"><graphic position="anchor" specific-use="HTML" mime-subtype="JPEG" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="MediaObjects/13130_2021_15453_Figa_HTML.jpg" id="MO1"></graphic
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
<a href="/en/project/LTT17020" target="_blank" >LTT17020: Study of Beyond Standard Model Physics with the International Experiment Belle II in Japan</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of High Energy Physics [online]
ISSN
1029-8479
e-ISSN
—
Volume of the periodical
Neuveden
Issue of the periodical within the volume
4
Country of publishing house
DE - GERMANY
Number of pages
19
Pages from-to
191
UT code for WoS article
000644192500001
EID of the result in the Scopus database
2-s2.0-85104718575