Search for Invisible Decays of Sub-GeV Dark Photons in Missing-Energy Events at the CERN SPS

Banerjee, D.; Burtsev, V.E.; Cooke, D.; Crivelli, P.; Depero, E.; Dermenev, A.; Donskov, S.V.; Dubinin, F.; Dusaev, R. R.; Emmenegger, S.; Fabich, A.; Фролов, В.; Gardikiotis, A.; Gninenko, S.; Hösgen, M.; Качанов, В.; Karneyeu, A.; Ketzer, B.; Kirpichnikov, D.; Kirsanov, M.; Kovalenko, Sergey; Kramarenko, V. A.; Kravchuk, L.; Krasnikov, N.; Kuleshov, S.; Lyubovitskij, Valery E.; Lysan, V.; Matveev, V.; Mikhailov, Yu.V.; Myalkovskiy, V. V.; Peshekhonov, V. D.; Peshekhonov, D.V.; Petuhov, O.; Polyakov, V.A.; Radics, B.; Rubbia, A.; Samoylenko, V.D.; Tikhomirov, V. O.; Tlisov, D.; Toropin, A.; Trifonov, A. Yu.; Vasilishin, B. I.; Vasquez, G. A.; Ulloa, P.; Zhukov, K.; Zioutas, K.

doi:10.1103/physrevlett.118.011802

Cited by 160 publications

(134 citation statements)

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“…In the central panel of figure 7 we show both constraints. If the invisible decays dominate, the BaBar mono-photon search [57] and the NA64 search for dark photons [55,56] lead to strong constraints on g e as summarized in the right panel of figure 7. Finally, if V also has couplings to quarks (as in the dark-photon case) additional constraints become relevant that restrict the parameter space further [29].…”

Section: Jhep03(2018)188mentioning

confidence: 99%

“…Additional strong constraints on the coupling to electrons can be obtained from the fixed target experiment NA64 [55,56] and from BaBar searches [31,57]. In the relevant range of V masses and couplings, there are only two possible decay modes of V : (i) the coupling g e allows the V to decay promptly to electrons; (ii) V can decay invisibly into neutrinos or a light dark sector.…”

Section: Jhep03(2018)188mentioning

confidence: 99%

“…For a given V mass we take the maximally allowed g e coupling from the combination of the bounds in the central panel of figure 7. In the right panel, we consider the case in of the muon and the electron are indirect constraints from having V in the loop, while the constraints from BaBar [31] and NA64 [55,56] come from direct decays to electrons. On the left panel, the constraint from ν-trident production based on measurements by the CCFR collaboration [52] assumes that the V couples with equal strength to the left-handed muon and muon neutrino [51], i.e., to the SU(2) doublet L µ .…”

Section: Jhep03(2018)188mentioning

confidence: 99%

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Light resonances and the low-q2 bin of $$ {R}_{K^{*}} $$

Altmannshofer

Harnik

Baker

et al. 2018

J. High Energ. Phys.

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LHCb has reported hints of lepton-flavor universality violation in the rare decays B → K ( * ) + − , both in high-and low-q 2 bins. Although the high-q 2 hint may be explained by new short-ranged interactions, the low-q 2 one cannot. We thus explore the possibility that the latter is explained by a new light resonance. We find that LHCb's central value of R K * in the low-q 2 bin is achievable in a restricted parameter space of new-physics scenarios in which the new, light resonance decays preferentially to electrons and has a mass within approximately 10 MeV of the di-muon threshold. Interestingly, such an explanation can have a kinematic origin and does not require a source of lepton-flavor universality violation. A model-independent prediction is a narrow peak in the differential B → K * e + e − rate close to the di-muon threshold. If such a peak is observed, other observables, such as the differential B → Ke + e − rate and R K , may be employed to distinguish between models. However, if a low-mass resonance is not observed and the low-q 2 anomaly increases in significance, then the case for an experimental origin of the lepton-flavor universality violating anomalies would be strengthened. To further explore this, we also point out that, in analogy to J/ψ decays, e + e − and µ + µ − decays of φ mesons can be used as a cross check of lepton-flavor universality by LHCb with 5 fb −1 of integrated luminosity.

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Section: Jhep03(2018)188mentioning

confidence: 99%

Section: Jhep03(2018)188mentioning

confidence: 99%

Section: Jhep03(2018)188mentioning

confidence: 99%

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Light resonances and the low-q2 bin of $$ {R}_{K^{*}} $$

Altmannshofer

Harnik

Baker

et al. 2018

J. High Energ. Phys.

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show abstract

“…The possibility of explaining the (g − 2) anomaly introducing exclusively a dark photon has been recently ruled out by searches for A decaying into invisible final states by BaBar [21] and NA64 [22]. Nevertheless, the anomaly can still be interpreted in terms of a dark photon with the addition of some other NP contributions.…”

Section: Dark Sector Searchesmentioning

confidence: 99%

Belle II physics prospects

Guido¹

2017

Proceedings of the 15th International Conference on Flavor Physics &Amp; CP Violation — PoS(FPCP2017)

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The Belle II experiment at the SuperKEKB B-factory at KEK is expected to start collecting data at the beginning of 2018, opening a new era for collider physics. Complementary to the LHC experiments, Belle II is designed to explore the intensity frontier. Its target is to collect an integrated luminosity of 50 ab −1 by 2024, which is 50 times larger than the data sample recorded by the Belle experiment. The Belle II data will offer a unique possibility of searching for New Physics phenomena through precision study of rare and suppressed processes, as well as further revealing the nature of QCD in describing matter. The physics program of Belle II will be wide and only a selection of topics are highlighted in this paper: semileptonic and leptonic B decays, electroweak penguins decays, time-dependent CP-violating decays, studies of mixing and rare decays in the charm sector, lepton flavour violation in τ decays, opportunities in bottomonium physics and searches for the dark sector.

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“…The sensitivity can be pushed further, by accumulating 4 • 10 :; positrons on target in two years or running, thus reaching 4~5 • 10 %D , as shown by the red-dashed line in Fig. 3, compared with the exclusions from past experiments (like BaBar [10]) and from present (NA64 [11]) and planned (MMAPS, VEPP-3 [12]) ones: even though the band favored by the muon − 2 anomaly is excluded, a large part of parameter plane (mass vs. coupling) remains still unexplored. FIGURE 3.…”

Section: Dark Sector Searches With Positronsmentioning

confidence: 99%