Upper limit on the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>η</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math> branching ratio with the KLOE detector

Ambrosino, F.; Chiefari, G.; Capon, G.; Franzini, P.; Giovannella, S.; Valente, P.; Saracino, G.; Micco, B. Di; Sciascia, B.; Venanzoni, G.; Branchini, P.; Chi, S.; Falco, S. Di; Lanfranchi, G.; Bacci, C.; Denig, A.; Dell’Agnello, S.; Murtas, F.; Capussela, T.; Campana, P.; Santovetti, E.; Gatti, C.; Ceradini, F.; Bloise, C.; Patera, V.; Veneziano, S.; Santangelo, P.; Barva, M.; Santis, A. De; Palutan, M.; Leone, D.; Simone, P. De; Nguyen, F.; Bertolucci, S.; Mei, W.; Martini, M.; Dreucci, M.; Gauzzi, P.; Antonelli, A.; Müller, S.; Primavera, M.; Bencivenni, G.; Testa, M.; Matsyuk, M.; Kluge, W.; Scuri, F.; Passalacqua, L.; Moulson, M.; Ventura, S.; Valeriani, B.; Ferrari, A.; Messi, R.; Perfetto, F.; Carboni, G.; Massarotti, P.; Spadaro, T.; Finocchiaro, G.; Bocci, V.; Ventura, A.; Beltrame, P.; Domenico, A. Di; Incagli, M.; Lacava, F.; Ciambrone, P.; Antonelli, M.; Meola, S.; Tortora, L.; Farilla, A.; Sfiligoi, I.; Cervelli, F.; Versaci, R.; Martemianov, M.; Sciubba, A.; Caloi, R.; Donato, C. Di; Conetti, S.; Napolitano, M.; Lucia, E. De; Bini, C.; Felici, G.; Ferrer, M. L.; Miscetti, S.; Spiriti, E.; Passeri, A.; Graziani, E.; Doria, A.; Bossi, F.; Zorzi, G. De; Lee‐Franzini, J.; Kulikov, V.; Forti, C.; Pontecorvo, L.; Villella, I.; Bowring, D.

doi:10.1016/j.physletb.2004.12.025

Cited by 23 publications

(9 citation statements)

References 12 publications

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“…This section presents the procedure to combine the 2001/2002 data analysed in ref. [7] with the 2004/2005 data sample to get a combined upper limit. In ref.…”

Section: Combination With 2001/2002 Datamentioning

confidence: 99%

“…In ref. [7] the upper limit was determined at 90% confidence level as: 1) with N (η → π + π − ) < 33, ε = (16.6 ± 0.2 stat ± 0.4 syst )%, and N η = 1.55 × 10 7 the normalisation determined from the observed φ → η(3π 0 )γ decays with a systematic uncertainty of 2%. The upper limit for this totally independent data sample has been re-evaluated using the same procedure described in section 4.…”

Section: Combination With 2001/2002 Datamentioning

confidence: 99%

“…The signal shape is kept the same as in ref. [7], a Gaussian function centered at the η mass value M η = 547.874 MeV/c 2 measured by KLOE [19] and a standard deviation of 1.33 MeV/c 2 estimated from the MC simulation. The 90% CL upper limit on B(η → π + π − ) is determined to be 1.36 × 10 −5 , which is consistent with the published result.…”

Section: Combination With 2001/2002 Datamentioning

confidence: 99%

“…The best upper limit to date on this branching fraction is from the KLOE experiment, B(η → π + π − ) < 1.3 × 10 −5 at 90% confidence level (CL) [7], based on the analysis of 350 pb −1 of data collected at the φ resonance peak in years 2001 and 2002. A recent upper limit has been obtained by the LHCb Collaboration [8], B(η → π + π − ) < 1.6 × 10 −5 at 90% CL, searching for the signal in D + → π + η and D + s → π + η decays produced in proton-proton collisions.…”

Section: Introductionmentioning

confidence: 99%

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Upper limit on the η → π+π− branching fraction with the KLOE experiment

Babusci¹,

Berłowski²,

Bloise³

et al. 2020

J. High Energ. Phys.

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Based on an integrated luminosity of 1.61 fb−1e+e− collision data collected with the KLOE detector at DAΦNE, the Frascati ϕ-factory, a search for the P- and CP-violating decay η → π+π− has been performed. Radiative ϕ → ηγ decay is exploited to access the η mesons. No signal is observed in the π+π− invariant mass spectrum, and the upper limit on the branching fraction at 90% confidence level is determined to be ℬ(η → π+π−) < 4.9 × 10−6, which is approximately three times smaller than the previous KLOE result. From the combination of these two measurements we get ℬ(η → π+π−) < 4.4 × 10−6 at 90% confidence level.

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“…This section presents the procedure to combine the 2001/2002 data analysed in ref. [7] with the 2004/2005 data sample to get a combined upper limit. In ref.…”

Section: Combination With 2001/2002 Datamentioning

confidence: 99%

Section: Combination With 2001/2002 Datamentioning

confidence: 99%

Section: Combination With 2001/2002 Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Upper limit on the η → π+π− branching fraction with the KLOE experiment

Babusci¹,

Berłowski²,

Bloise³

et al. 2020

J. High Energ. Phys.

Self Cite

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show abstract

“…With this sample an asymmetry as small as 10 −3 can be measured. KLOE has already set the best limits on the decay rates of η → π + π − [13] and η → γγγ [14], two processes which are forbidden by invariance under P and C transformations. Using the full KLOE-2 statistics one can improve the above results by about two orders of magnitude; these will be the most precise tests ever done of P and C conservation in strong and electromagnetic interactions.…”

Section: Other Tests Of Discrete Symmetriesmentioning

confidence: 99%

Status of KLOE-2

Venanzoni¹

2010

Chinese Phys. C

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Recent KLOE results on hadron physics

Bini

The IVth International Conference on Quarks and Nuclear Physics

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In this paper, we discuss the γp → K 0 Σ + and γn → K 0 Σ 0 reactions, with a peculiar behavior around the K * 0 Λ threshold, due to a 1/2 − resonance around 2035 MeV. Similarly, we discuss a BES experiment, J/ψ → ηK * 0 K * 0 decay, which supports the existence of a new h 1 resonance around 1830 MeV that was predicted from the vector-vector interaction. A short discussion is then made about recent advances in the charm and beauty sectors.

show abstract

Upper limit on the η→π+π− branching ratio with the KLOE detector

Abstract: Upper limit on the η → π + π − branching ratio with the KLOE detector.

Cited by 23 publications

References 12 publications

Upper limit on the η → π+π− branching fraction with the KLOE experiment

Upper limit on the η → π+π− branching fraction with the KLOE experiment

Status of KLOE-2

Recent KLOE results on hadron physics

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