Probing MeV Dark Matter at Low-Energy<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Colliders

Borodatchenkova, Natalia; Choudhury, Debajyoti; Drees, Manuel

doi:10.1103/physrevlett.96.141802

Cited by 116 publications

(184 citation statements)

References 18 publications

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“…4 that the kinetic mixing Π(q 2 ) is enhanced with a large value of E γ , which corresponds to a light Z . The differential cross section of the signal process e + e − → γZ in the center-of-mass frame is found to be [66,98,99] …”

Section: Light Z Search At Belle-iimentioning

confidence: 99%

Detecting the Lμ−Lτ gauge boson at Belle II

et al. 2017

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We discuss the feasibility of detecting the gauge boson of the U (1) L µ −L τ symmetry, which possesses a mass in the range between MeV and GeV, at the Belle-II experiment. The kinetic mixing between the new gauge boson Z and photon is forbidden at the tree level and is radiatively induced. The leptonic force mediated by such a light boson is motivated by the discrepancy in muon anomalous magnetic moment and also the gap in the energy spectrum of cosmic neutrino. Defining the process e + e − → γZ → γνν (missing energy) to be the signal, we estimate the numbers of the signal and the background events and show the parameter region to which the Belle-II experiment will be sensitive. The signal process in the L µ − L τ model is enhanced with a light Z , which is a characteristic feature differing from the dark photon models with a constant kinetic mixing. We find that the Belle-II experiment with the design luminosity will be sensitive to the Z with the mass M Z 1 GeV and the new gauge coupling g Z 8 · 10 −4 , which covers a half of the unconstrained parameter region that explains the discrepancy in muon anomalous magnetic moment. The possibilities to improve the significance of the detection are also discussed.

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Section: Light Z Search At Belle-iimentioning

confidence: 99%

Detecting the Lμ−Lτ gauge boson at Belle II

et al. 2017

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“…Such DM can be probed at colliders [10][11][12][13][14][15], at direct detection experiments [9,16,17], and at proton-and electron-beam dumps [18][19][20][21][22][23]. Constraints from the Cosmic Microwave Background (CMB) already limit the s-wave DM annihilation cross section to SM matter to be below that of a thermal WIMP, for DM masses below ∼ 7 GeV [24][25][26][27].…”

Section: Jhep11(2013)193mentioning

confidence: 99%

Constraining light dark matter with diffuse X-ray and gamma-ray observations

Essig

Kuflik

McDermott

et al. 2013

J. High Energ. Phys.

315

431

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We present constraints on decaying and annihilating dark matter (DM) in the 4 keV to 10 GeV mass range, using published results from the satellites HEAO-1, INTEGRAL, COMPTEL, EGRET, and the Fermi Gamma-ray Space Telescope. We derive analytic expressions for the gamma-ray spectra from various DM decay modes, and find lifetime constraints in the range 10 24 − 10 28 sec, depending on the DM mass and decay mode. We map these constraints onto the parameter space for a variety of models, including a hidden photino that is part of a kinetically mixed hidden sector, a gravitino with Rparity violating decays, a sterile neutrino, DM with a dipole moment, and a dark pion. The indirect constraints on sterile-neutrino and hidden-photino DM are found to be more powerful than other experimental or astrophysical probes in some parts of parameter space. While our focus is on decaying DM, we also present constraints on DM annihilation to electron-positron pairs. We find that if the annihilation is p-wave suppressed, the galactic diffuse constraints are, depending on the DM mass and velocity at recombination, more powerful than the constraints from the Cosmic Microwave Background.

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“…Moreover, several proposals to investigate directly properties of the U-boson in low energy (E c.m ≤ 10 GeV) experiments have been put forward. These include experiments using e + e − colliders through the e + e − → γU process [4,95,[97][98][99], meson rare decays at meson factories and fixed target electron-nucleus scatterings [95]. Many mesons can decay into the U-boson with branching ratio…”

Section: B Heavy-ion Reactions As a Possible Tool For Dark U-boson Smentioning

confidence: 99%

“…[81,82] for reviews. Besides the weakly interacting massive particles as the most popular candidates for dark matter, it has been proposed that light dark matter particles χ with a mass in the range of 0.5-20 MeV may exist [1][2][3][4][5]. In particular, the annihilation of χχ → e + e − through the exchange of the light vector U-boson of mass 10-100 MeV, has been used to explain successfully the INTEGRAL satellite observation of the excess flux of 511 keV photons from the center region of our galaxy [83] although alternative explanations exist [84].…”

Section: B Heavy-ion Reactions As a Possible Tool For Dark U-boson Smentioning

confidence: 99%

“…The first purpose is to look for new and possibly more sensitive probes of the high-density behavior of nuclear symmetry energy in high energy heavy-ion collisions. The other purpose is to explore the possibility of producing the neutral vector U-boson (dark photon) introduced in the super-symmetric extension of the Standard Model (SM) [1][2][3][4][5] in relativistic heavy-ion collisions. The two purposes naturally come together in studying properties of neutron stars where both the possible existence of the U-boson and the high-density behavior of nuclear symmetry energy affect significantly the Equation of State (EOS) of dense neutron-rich nucleonic matter.…”

Section: Introductionmentioning

confidence: 99%

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Effects of nuclear symmetry energy on η meson production and its rare decay to the dark U-boson in heavy-ion reactions

Yong

2013

Physics Letters B

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Using a relativistic transport model ART1.0, we explore effects of nuclear symmetry energy on η meson production and its rare decay to the dark U-boson in heavy-ion reactions from 0.2 to 10 GeV/nucleon available at several current and future facilities. The yield of η mesons at sub-threshold energies is found to be very sensitive to the density dependence of nuclear symmetry energy. Above a beam energy of about 5 GeV/nucleon in Au+Au reactions, the sensitivity to symmetry energy disappears. Using the branching ratio of the rare η decay (η → γU ) available in the literature, we estimate the maximum cross section for the U-boson production in the energy range considered, providing a useful reference for future U-boson search using heavy-ion reactions.PACS numbers: 21.65.Mn, 21.65.Ef, 95.35.+d

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Probing MeV Dark Matter at Low-Energye+e−Colliders

Cited by 116 publications

References 18 publications

Detecting the Lμ−Lτ gauge boson at Belle II

Detecting the Lμ−Lτ gauge boson at Belle II

Constraining light dark matter with diffuse X-ray and gamma-ray observations

Effects of nuclear symmetry energy on η meson production and its rare decay to the dark U-boson in heavy-ion reactions

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