Limit on the production of a new vector boson in e + e − → Uγ, U → π + π − with the KLOE experiment

Anastasi, A.; Babusci, D.; Bencivenni, G.; Berłowski, M.; Bloise, C.; Bossi, F.; Branchini, P.; Budano, A.; Balkeståhl, L. Caldeira; Cao, B.; Ceradini, F.; Ciambrone, P.; Curciarello, F.; Czerwiński, E.; D’Agostini, G.; Dané, E.; Leo, V. De; Lucia, E. De; Santis, A. De; Simone, P. De; Cicco, Alessandro Di; Domenico, A. Di; Salvo, R. Di; Domenici, D.; D’Uffizi, A.; Fantini, A.; Felici, G.; Fiore, S.; Gajos, A.; Gauzzi, P.; Giardina, G.; Giovannella, S.; Graziani, E.; Happacher, F.; Heijkenskjöld, L.; Andersson, W. Ikegami; Johansson, T.; Kamińska, D.; Krzemień, W.; Kupść, A.; Loffredo, S.; Mandaglio, G.; Martini, M.; Mascolo, M.; Messi, R.; Miscetti, S.; Morello, G.; Moricciani, D.; Moskal, P.; Palladino, A.; Papenbrock, M.; Passeri, A.; Patera, V.; Río, E. Pérez del; Ranieri, A.; Santangelo, P.; Sarra, I.; Schioppa, M.; Silarski, M.; Sirghi, F.; Tortora, L.; Venanzoni, G.; Wiślicki, W.; Wolke, M.

doi:10.1016/j.physletb.2016.04.019

Cited by 115 publications

(100 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As seen from the 90% confidence level contour plots in Fig. 3 (right), the recent KLOE-2 measurements [8,9] constrain the region of the U mass above 600 MeV and ε 2 down to 10 −7 , whereas other experiments [12,13,14,15,16,17] dominate the region of lower masses.…”

Section: Search For Dark Forcementioning

confidence: 82%

See 1 more Smart Citation

The KLOE-2 experiment at DAFNE

Wiślicki¹

2017

Proceedings of XIII International Conference on Heavy Quarks and Leptons — PoS(HQL 2016)

View full text Add to dashboard Cite

We present recent results obtained by the KLOE-2 Collaboration at the DAΦNE e + e − collider. The first class of results concerns search for dark forces at the scale of 1 GeV in associated production of γ and the U boson, in search for the Higgsstrahlung and in possible decays of φ into η and U. The second is in neutral kaon physics, on testing the CPT and Lorentz invariance, and on search for quantum decoherence effects in entangled pairs of kaons. The third class of results concerns precision measurements in hadronic physics at low energy where transition form factors of φ to pseudoscalar mesons π 0 and η are determined.

show abstract

Section: Search For Dark Forcementioning

confidence: 82%

“…extensive search for the final-state pairs µ + µ − [7], e + e − [8] and π + π − [9] and experimentally determined 90% confidence regions in the ε vs. M U plane. Possible identification of the process U → µ + µ − is also important for its possible contribution to the g-2 anomaly of µ (cf.…”

Section: Search For Dark Forcementioning

confidence: 99%

The KLOE-2 experiment at DAFNE

Wiślicki¹

2017

Proceedings of XIII International Conference on Heavy Quarks and Leptons — PoS(HQL 2016)

View full text Add to dashboard Cite

show abstract

“…The excluded region indicated in Fig. 1 as KLOE (4) shows a more stringent limit than the existing ones in the ρ − ω region and above [7]. Figure 1.…”

Section: Search For E + E − → Uγ With U Decaying Into Lepton or Pion mentioning

confidence: 82%

“…Moreover, search for the U boson in such energy range is of special interest as it could explain a number of recent puzzing astrophysical observations such as the excess of positrons in cosmic rays observed by AMS and PAMELA [1,2], 511 keV gamma rays from the galactic centre seen by INTEGRAL [3] or the annual modulation signal measured by DAMA/LIBRA [4]. The KLOE experiment has searched evidence of the U boson existence as a sharp resonance in the invariant mass spectrum of lepton or pion pairs produced in radiative processes e + e − → + − (γ) [5,6], e + e − → π + π − (γ) [7] and in decays of the φ meson [8,9], as well as in the dark Higgsstrahlunng process [10].…”

Section: Introductionmentioning

confidence: 99%

Search for dark forces with KLOE

Gajos

2016

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. During the last years several Dark Sector Models have been proposed in order to address striking astrophysical observations which failed standard interpretations. In the minimal case a new vector particle, the so called dark photon, or A or U boson, is introduced, with small coupling with Standard Model particles. Also, the existence of a dark Higgs boson h is postulated, in analogy with the Standard Model, to give mass to the U boson through the Spontaneous Symmetry Breaking mechanism. The KLOE experiment working at DAΦNE, an e + e − collider operating in Frascati (near Rome), searched for the existence of the U boson investigating three different processes and six different final states: (1) in Dalitz decays of the φ meson φ → ηU, with U → e + e − and η → π + π − π 0 and π 0 π 0 π 0 , (2) in e + e − → Uγ events, with U decaying into lepton and pion pairs, (3) in the dark Higgsstrahlung process, e + e − → Uh , U → μ + μ − , h invisible. Limits on the model parameters have been set at 90 % CL for U boson masses below 1 GeV. Further improvements are expected in terms of sensitivity and discovery potential with the new KLOE-2 detector.

show abstract

“…3 (right). KLOE has searched for the Dark Photon below 1 GeV in the μ + μ − [19], the e + e − [20], and more recently also in the π + π − final states [21]. A particulrily competitive parameter range was probed by BABAR below 10 GeV by searching for peaks in the radiative μ + μ − and e + e − spectrum [22].…”

Section: Data Mining Campaigns Using Existing Data Setsmentioning

confidence: 99%

Review of dark photon searches

Denig

2016

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. Dark Photons are hypothetical extra-U(1) gauge bosons, which are motivated by a number of astrophysical anomalies as well as the presently seen deviation between the Standard Model prediction and the direct measurement of the anomalous magnetic moment of the muon, (g − 2) μ . The Dark Photon does not serve as the Dark Matter particle itself, but acts as a messenger particle of a hypothetical Dark Sector with residual interaction to the Standard Model. We review recent Dark Photon searches, which were carried out in a global effort at various hadron and particle physics facilities. We also comment on the perspectives for future invisble searches, which directly probe the existence of Light Dark Matter particles. MotivationDark Photons are hypothetical particles of an extra U(1) gauge group. Such extra U(1) gauge groups are predicted by almost any extension of the Standard Model. Indeed, the related extra U(1) gauge bosons are searched for from the lowest (e.g. searches for axion-like particles) up to the highest energies at the LHC. Recently, the mass range for a vector particle in the MeV to GeV scale has been in the focus of interest due to the observation by Arkani Hamed et al. [1] that particles of such a mass scale might explain a surprisingly large number of astrophysical anomalies. In addition, it was realized that a Dark Photon of such a mass might explain the presently seen deviation between the direct measurement and the Standard Model prediction of the anomalous magnetic moment of the muon, (g − 2) μ [2]. . The lower diagram might give rise to the positron excess presently seen in the spectrum of cosmic rays, which is indeed one of the most striking astrophysical anomalies. Dark Matter (DM) particles annihilate via a Dark Photon into an e + e − pair. Within the kinetic mixing model two free parameters remain: the mass of the Dark Photon, m γ , and the mixing parameter , which parametrizes the strength of the coupling of the Dark Photon to ordinary Standard Model matter: 2 = α /α, where α is the QED fine structure constant. The possible relation of the Dark Photon to the Dark Matter problem as well as the fact that it might explain the (g − 2) μ puzzle, triggered an enormous theoretical and experimental interest in the particle

show abstract

Limit on the production of a new vector boson in e + e − → Uγ, U → π + π − with the KLOE experiment

Cited by 115 publications

References 49 publications

The KLOE-2 experiment at DAFNE

The KLOE-2 experiment at DAFNE

Search for dark forces with KLOE

Review of dark photon searches

Contact Info

Product

Resources

About