Measurement of the Ξ0→Λγ decay asymmetry and branching fraction

Lai, A.; Marras, D.; Bevan, A. J.; Dosanjh, R.S.; Gershon, T.; Hay, Bruce A.; Kalmus, G.; Lazzeroni, C.; Munday, D.J.; Olaiya, E.; Parker, M. A.; White, T. O.; Wotton, S. A.; Barr, G.; Bocquet, G.; Ceccucci, A.; Çuhadar-Dönszelmann, T.; Cundy, D.; D’Agostini, G.; Doble, N.; Falaleev, V.; Gatignon, L.; Gonidec, A.; Gorini, B.; Govi, G.; Grafström, P.; Kubischta, W.; Lacourt, A.; Norton, A.; Palestini, S.; Panzer-Steindel, B.; Taureg, H.; Velasco, M.; Wahl, H.; Cheshkov, C.; Gaponenko, A.; Hristov, P.; Kekelidze, V.; Madigojine, D.; Molokanova, N.; Potrebenikov, Yu.; Tatishvili, G.; Tkatchev, A.; Zinchenko, A.; Knowles, I.G.; Martin, V. J.; Sacco, R.; Walker, A.; Contalbrigo, M.; Dalpiaz, P.; Duclos, J.; Frabetti, P. L.; Gianoli, A.; Martini, M.; Petrucci, F.; Savrié, M.; Bizzeti, A.; Calvetti, M.; Collazuol, G.; Graziani, G.; Iacopini, E.; Lenti, M.; Martelli, F.; Veltri, M.; Becker, H.; Eppard, K.; Eppard, M.; Fox, H.; Kalter, A.; Kleinknecht, K.; Koch, U.; Köpke, L.; Silva, P. Lopes da; Marouelli, P.; Pellmann, I.; Peters, A.; Renk, B.; Schmidt, S.; Schönharting, V.; Schué, Y.; Wanke, R.; Winhart, A.; Wittgen, M.; Chollet, J.C.; Fayard, L.; Iconomidou-Fayard, L.; Ocariz, J.; Unal, G.; Wingerter-Seez, I.; Anzivino, G.; Cenci, P.; Imbergamo, E.; Lubrano, P.; Mestvirishvili, A.; Nappi, A.; Pepé, M.; Piccini, M.; Bertanza, L.; Carosi, R.; Casali, R.; Cerri, C.; Cirilli, M.; Costantini, F.; Fantechi, R.; Giudici, S.; Mannelli, I.; Pierazzini, G.; Sozzi, M.; Chèze, J.B.; Cogan, J. G.; Beer, M. De; Debu, P.; Formica, A.; Cassagnac, R. Granier de; Mazzucato, E.; Peyaud, B.; Turlay, R.; Vallage, B.; Holder, M.; Maier, A.; Ziółkowski, M.; Arcidiacono, R.; Biino, C.; Cartiglia, N.; Guida, R.; Marchetto, F.; Menichetti, E.; Pastrone, N.; Nassalski, J.; Rondio, E.; Szleper, M.; Wiślicki, W.; Wronka, S.; Dibon, H.; Fischer, G.; Jeitler, M.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Pernicka, M.; Taurok, A.; Widhalm, L.

doi:10.1016/j.physletb.2004.01.041

Cited by 10 publications

(7 citation statements)

References 22 publications

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“…The first result is a factor of three more precise than the previous measurement by NA48 [10] while the latter is of similar accuracy as the KTeV measurement [11], and both are in very good agreement with the previous measurements.…”

Section: Discussionsupporting

confidence: 87%

See 1 more Smart Citation

New precise measurements of the and decay asymmetries

Batley¹,

Kalmus²,

Lazzeroni³

et al. 2010

Physics Letters B

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The decay asymmetries of the weak radiative Hyperon decays Ξ 0 → Λγ and Ξ 0 → Σ 0 γ have been measured with high precision using data of the NA48/1 experiment at CERN. From about 52 000 Ξ 0 → Λγ and 15 000 Ξ 0 → Σ 0 γ decays, we obtain for the decay asymmetries α Ξ 0 →Λγ = −0.704 ± 0.019 stat ± 0.064 syst and α Ξ 0 →Σ 0 γ = −0.729 ± 0.030 stat ± 0.076 syst , respectively. These results are in good agreement with previous experiments, but more precise.2

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Section: Discussionsupporting

confidence: 87%

“…Measurements of Ξ 0 decay asymmetries have been performed by the NA48 experiment, which has obtained a value of α Ξ 0 →Λγ = −0.78 ± 0.19 using 730 reconstructed events [10], and by the KTeV collaboration, which found α Ξ 0 →Σ 0 γ = −0.63± 0.09 from more than 4000 events [11].…”

Section: Introductionmentioning

confidence: 99%

New precise measurements of the and decay asymmetries

Batley¹,

Kalmus²,

Lazzeroni³

et al. 2010

Physics Letters B

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“…These values agree with previous measurements by NA48 on Ξ 0 → Λγ [2] and KTeV on Ξ 0 → Σγ [3], but are much more precise. In particular the result on Ξ 0 → Λγ is of high theoretical interest, as it confirms the large negative value of the decay asymmetry, which is difficult to accommodate for quark and vector meson dominance models.…”

Section: Weak Radiative ξ 0 Decayssupporting

confidence: 91%

Rare Kaon and Hyperon Decays in Na48 Experiment

Molokanova¹

2009

Particle Physics on the Eve of LHC

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“…[8] was written and for a couple of years afterwards, experiment indicated substantial positive asymmetry of the Ξ 0 → Λγ decay, supporting the belief that Hara's theorem is violated (my last paper adopting this view being [14]). It was only around the time of the publication of [14] that the NA48 experiment [15] measured the Ξ 0 → Λγ asymmetry to be −0.78 ± 0.19, i.e. large and negative, thus providing a strong experimental argument for Hara's theorem being satisfied.…”

Section: Decaymentioning

confidence: 99%