New upper limit on the decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>η</mml:mi><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>e</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>

Browder, T. E.; Li, F.; Li, Y.; Rodriguez, J. L.; Bergfeld, T.; Eisenstein, B. I.; Ernst, J.; Gladding, G. E.; Gollin, G. D.; Hans, R. M.; Johnson, E.; Karliner, I.; Marsh, M. A.; Palmer, M.; Selen, M.; Thaler, J. J.; Edwards, K. W.; Bellerive, A.; Janicek, R.; MacFarlane, D. B.; McLean, K. W.; Patel, P. M.; Sadoff, A. J.; Ammar, R.; Baringer, P.; Bean, A.; Besson, D.; Coppage, D.; Darling, C.; Davis, R.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, N.; Anderson, S.; Kubota, Y.; Lattery, M.; Lee, S. J.; O’Neill, J. J.; Patton, S.; Poling, R.; Riehle, T.; Savinov, V.; Smith, A.; Alam, M. S.; Athar, S. B.; Ling, Z.; Mahmood, A. H.; Severini, H.; Timm, S.; Wappler, F. R.; Anastassov, A.; Blinov, S.; Duboscq, J. E.; Fisher, K. D.; Fujino, D.; Gan, K. K.; Hart, T.; Honscheid, K.; Kagan, H.; Kass, R.; Lee, J.; Spencer, M. B.; Sung, M.; Undrus, A.; Wanke, R.; Wolf, A.; Zoeller, M. M.; Nemati, B.; Richichi, S. J.; Ross, W. R.; Skubic, P.; Bishai, M.; Fast, J. E.; Gerndt, E.; Hinson, J. W.; Menon, N.; Miller, D. H.; Shibata, E. I.; Shipsey, I. P. J.; Yurko, M.; Gibbons, L. K.; Glenn, S.; Johnson, S. D.; Kwon, Y. J.; Roberts, S.; Thorndike, E. H.; Jessop, C.; Lingel, K.; Marsiske, H.; Perl, M.; Ugolini, D.; Wang, R.; Zhou, Xiang; Coan, T. E.; Fadeyev, V.; Korolkov, I.; Maravin, Y.; Narsky, I.; Shelkov, V.; Staeck, J.; Stroynowski, R.; Volobouev, I.; Ye, J.; Artuso, M.; Efimov, A.; Frasconi, F.; Gao, M.; Goldberg, M.; He, D.; Köpp, S.; Moneti, G. C.; Mountain, R.; Schuh, S.; Skwarnicki, T.; Stone, S.; Viehhauser, G. H. A.; Xing, X.; Bartelt, J.; Csorna, S. E.; Jain, V.; Márka, S.; Godang, R.; Kinoshita, K.; Lai, I. C.; Pomianowski, P.; Schrenk, S.; Bonvicini, G.; Cinabro, D.; Greene, R.; Perera, L. P.; Zhou, G. J.; Barish, B. C.; Chadha, M.; Chan, S.; Eigen, G.; Miller, J. S.; O’Grady, C. P.; Śchmidtler, M.; Urheim, J.; Weinstein, A. J.; Würthwein, F.; Asner, D. M.; Bliss, D. W.; Masek, G.; Paar, H. P.; Prell, S.; Sivertz, M.; Sharma, V.; Gronberg, J.; Hill, T. S.; Kutschke, R.; Lange, D. J.; Menary, S.; Morrison, R. J.; Nelson, H. N.; Nelson, T. K.; Qiao, C. F.; Richman, J. D.; Roberts, D. A.; Rýd, A.; Witherell, M. S.; Balest, R.; Behrens, B. H.; Ford, W. T.; Park, H.; Roy, J.; Smith, J. G.; Alexander, J.; Bebek, C.; Berger, B. E.; Berkelman, K.; Bloom, K.; Cassel, D. G.; Cho, H. A.; Coffman, D. M.; Crowcroft, D. S.; Dickson, M.; Drell, P. S.; Ecklund, K. M.; Ehrlich, R.; Elia, R.; Foland, A.; Gaidarev, P.; Galik, R. S.; Gittelman, B.; Gray, S. W.; Hartill, D. L.; Heltsley, B. K.; Hopman, P. I.; Kandaswamy, J.; Kim, P. C.; Kreinick, D. L.; Lee, T.; Liu, Y.; Ludwig, G. S.; Masui, J.; Mevissen, J.; Mistry, N. B.; Ng, C. R.; Nordberg, E.; Ogg, M.; Patterson, J. R.; Peterson, D.; Riley, D.; Soffer, A.; Valant-Spaight, B.; Ward, C. P.; Athanas, M.; Avery, P.; Jones, C. D.; Lohner, M.; Prescott, C.; Yelton, J.; Zheng, J. P.; Brandenburg, G.; Briere, R. A.; Gao, Y. S.; Kim, D. Y.J.; Wilson, Richard; Yamamoto, H.

doi:10.1103/physrevd.56.5359

Cited by 10 publications

(8 citation statements)

References 10 publications

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“…All of them confirm the main conclusion about the radiative decay mode enhancement, although with smaller branching ratio ranging from 0.9 · 10 −6 [5] to 2 · 10 −6 [7]. The recent experimental upper limits [9] are still far above of these predictions.…”

supporting

confidence: 73%

Radiative leptonicBdecays in the instantaneous Bethe-Salpeter approach

2001

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supporting

confidence: 73%

Radiative leptonicBdecays in the instantaneous Bethe-Salpeter approach

2001

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“…In fact this limit has been pushed down to 4.9 · 10 −6 lately using HADES dilepton data [24]. However, the theoretical expectation from helicity suppression is still four orders of magnitude lower [56]. The absence of any η peak in the measured spectra allows us to conclude that the true branching ratio must be significantly lower than the upper limit just mentioned [57].…”

Section: Dilepton Decays and Form Factorsmentioning

confidence: 94%

Dilepton production in proton-induced reactions at SIS energies with the GiBUU transport model

2012

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We present dilepton spectra from p+p, d+p and p+Nb reactions at SIS energies, which were simulated with the GiBUU transport model in a resonance model approach. These spectra are compared to the data published by the HADES and DLS collaborations. It is shown that the ρ spectral function includes non-trivial effects already in elementary reactions, due to production via baryon resonances, which can yield large contributions to the dilepton spectrum. Dilepton spectra from nuclear reactions in the energy range of the HADES experiment are thus found to be sensitive also to properties of nucleon resonances in the nuclear medium.PACS. PACS-key discribing text of that key -PACS-key discribing text of that key arXiv:1203.3557v3 [nucl-th]

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“…While the direct decay of the η meson into a µ + µ − pair has been observed, for the corresponding e + e − decay only an upper limit of BR(η → e + e − ) < 2.7 · 10 −5 is known [362]. However, the theoretical expectation from helicity suppression is still four orders of magnitude lower [363]. The Dalitz decays of the pseudoscalar mesons, P = π 0 , η, η , are treated via the parametrization [364], dΓ…”

Section: Discussionmentioning

confidence: 99%

Transport-theoretical description of nuclear reactions

et al. 2012

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In this review we first outline the basics of transport theory and its recent generalization to offshell transport. We then present in some detail the main ingredients of any transport method using in particular the Giessen Boltzmann-Uehling-Uhlenbeck (GiBUU) implementation of this theory as an example. We discuss the potentials used, the ground state initialization and the collision term, including the in-medium modifications of the latter. The central part of this review covers applications of GiBUU to a wide class of reactions, starting from pion-induced reactions over proton and antiproton reactions on nuclei to heavy-ion collisions (up to about 30 AGeV). A major part concerns also the description of photon-, electron-and neutrino-induced reactions (in the energy range from a few 100 MeV to a few 100 GeV). For this wide class of reactions GiBUU gives an excellent description with the same physics input and the same code being used. We argue that GiBUU is an indispensable tool for any investigation of nuclear reactions in which final-state interactions play a role. Studies of pion-nucleus interactions, nuclear fragmentation, heavy-ion reactions, hypernucleus formation, hadronization, color transparency, electronnucleus collisions and neutrino-nucleus interactions are all possible applications of GiBUU and are discussed in this article.

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New upper limit on the decayη→e+e−

Cited by 10 publications

References 10 publications

Radiative leptonicBdecays in the instantaneous Bethe-Salpeter approach

Radiative leptonicBdecays in the instantaneous Bethe-Salpeter approach

Dilepton production in proton-induced reactions at SIS energies with the GiBUU transport model

Transport-theoretical description of nuclear reactions

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