First observation and branching fraction and decay parameter measurements of the weak radiative decay Ξ0 → Λ e+ e-

J. R. Batley; G. E. Kalmus; C. Lazzeroni; D. J. Munday; M. Patel; M. W. Slater; S. A. Wotton; R. Arcidiacono; G. Bocquet; A. Ceccucci; D. Cundy; N. Doble; V. Falaleev; L. Gatignon; A. Gonidec; P. Grafström; W. Kubischta; I. Mikulec; A. Norton; B. Panzer-Steindel; P. Rubin; H. Wahl; E. Goudzovski; P. Hristov; V. Kekelidze; L. Litov; D. Madigozhin; N. Molokanova; Yu Potrebenikov; S. Stoynev; A. Zinchenko; E. Monnier; E. Swallow; R. Winston; R. Sacco; A. Walker; W. Baldini; P. Dalpiaz; P. L. Frabetti; A. Gianoli; M. Martini; F. Petrucci; M. Savrié; M. Scarpa; A. Bizzeti; M. Calvetti; G. Collazuol; E. Iacopini; M. Lenti; G. Ruggiero; M. Veltri; M. Behler; K. Eppard; M. Eppard; A. Hirstius; K. Kleinknecht; U. Koch; P. Marouelli; L. Masetti; U. Moosbrugger; C. Morales Morales; A. Peters; R. Wanke; A. Winhart; A. Dabrowski; T. Fonseca Martin; M. Velasco; G. Anzivino; P. Cenci; E. Imbergamo; G. Lamanna; P. Lubrano; A. Michetti; A. Nappi; M. Pepe; M. C. Petrucci; M. Piccini; M. Valdata; C. Cerri; F. Costantini; R. Fantechi; L. Fiorini; S. Giudici; I. Mannelli; G. Pierazzini; M. Sozzi; C. Cheshkov; J. B. Cheze; M. De Beer; P. Debu; G. Gouge; G. Marel; E. Mazzucato; B. Peyaud; B. Vallage; M. Holder; A. Maier; M. Ziolkowski; C. Biino; N. Cartiglia; M. Clemencic; S. Goy Lopez; F. Marchetto; E. Menichetti; N. Pastrone; W. Wislicki; H. Dibon; M. Jeitler; M. Markytan; G. Neuhofer; L. Widhalm

doi:10.1016/j.physletb.2007.04.066

First observation and branching fraction and decay parameter measurements of the weak radiative decay Ξ⁰ → Λ e⁺ e^-

J. R. Batley
, G. E. Kalmus
, C. Lazzeroni
, D. J. Munday
, M. Patel
, M. W. Slater
, S. A. Wotton
, R. Arcidiacono
, G. Bocquet
, A. Ceccucci
, D. Cundy
, N. Doble
, V. Falaleev
, L. Gatignon
, A. Gonidec
, P. Grafström
, W. Kubischta
, I. Mikulec
, A. Norton
, B. Panzer-Steindel

P. Rubin, H. Wahl, E. Goudzovski, P. Hristov, V. Kekelidze, L. Litov, D. Madigozhin, N. Molokanova, Yu Potrebenikov, S. Stoynev, A. Zinchenko, E. Monnier, E. Swallow, R. Winston, R. Sacco, A. Walker, W. Baldini, P. Dalpiaz, P. L. Frabetti, A. Gianoli, M. Martini, F. Petrucci, M. Savrié, M. Scarpa, A. Bizzeti, M. Calvetti, G. Collazuol, E. Iacopini, M. Lenti, G. Ruggiero, M. Veltri, M. Behler, K. Eppard, M. Eppard, A. Hirstius, K. Kleinknecht, U. Koch, P. Marouelli, L. Masetti, U. Moosbrugger, C. Morales Morales, A. Peters, R. Wanke, A. Winhart, A. Dabrowski, T. Fonseca Martin, M. Velasco, G. Anzivino, P. Cenci, E. Imbergamo, G. Lamanna, P. Lubrano, A. Michetti, A. Nappi, M. Pepe, M. C. Petrucci, M. Piccini, M. Valdata, C. Cerri, F. Costantini, R. Fantechi, L. Fiorini, S. Giudici, I. Mannelli, G. Pierazzini, M. Sozzi, C. Cheshkov, J. B. Cheze, M. De Beer, P. Debu, G. Gouge, G. Marel, E. Mazzucato, B. Peyaud, B. Vallage, M. Holder, A. Maier, M. Ziolkowski, C. Biino, N. Cartiglia, M. Clemencic, S. Goy Lopez, F. Marchetto, E. Menichetti, N. Pastrone, W. Wislicki, H. Dibon, M. Jeitler, M. Markytan, G. Neuhofer, L. Widhalm

Research output: Contribution to journal › Article › peer-review

Abstract

The weak radiative decay Ξ⁰ → Λ e⁺ e^- has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of 15 ± 5 events. We determine the branching fraction B (Ξ⁰ → Λ e⁺ e^-) = [7.6 ± 0.4 (stat) ± 0.4 (syst) ± 0.2 (norm)] × 10^-6, consistent with an internal bremsstrahlung process, and the decay asymmetry parameter α_{Ξ Λ e e} = - 0.8 ± 0.2, consistent with that of Ξ⁰ → Λ γ. The charge conjugate reaction over(Ξ⁰, -) → over(Λ, -) e⁺ e^- has also been observed.

Original language	English
Pages (from-to)	1-8
Number of pages	8
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	650
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2007.04.066
Publication status	Published - 21 Jun 2007
Externally published	Yes

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10.1016/j.physletb.2007.04.066

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Batley, J. R., Kalmus, G. E., Lazzeroni, C., Munday, D. J., Patel, M., Slater, M. W., Wotton, S. A., Arcidiacono, R., Bocquet, G., Ceccucci, A., Cundy, D., Doble, N., Falaleev, V., Gatignon, L., Gonidec, A., Grafström, P., Kubischta, W., Mikulec, I., Norton, A., ... Widhalm, L. (2007). First observation and branching fraction and decay parameter measurements of the weak radiative decay Ξ⁰ → Λ e⁺ e^-. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 650(1), 1-8. https://doi.org/10.1016/j.physletb.2007.04.066

@article{bca4640a513e465f92f323427de48ed9,

title = "First observation and branching fraction and decay parameter measurements of the weak radiative decay Ξ0 → Λ e+ e-",

abstract = "The weak radiative decay Ξ0 → Λ e+ e- has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of 15 ± 5 events. We determine the branching fraction B (Ξ0 → Λ e+ e-) = [7.6 ± 0.4 (stat) ± 0.4 (syst) ± 0.2 (norm)] × 10-6, consistent with an internal bremsstrahlung process, and the decay asymmetry parameter αΞ Λ e e = - 0.8 ± 0.2, consistent with that of Ξ0 → Λ γ. The charge conjugate reaction over(Ξ0, -) → over(Λ, -) e+ e- has also been observed.",

author = "Batley, \{J. R.\} and Kalmus, \{G. E.\} and C. Lazzeroni and Munday, \{D. J.\} and M. Patel and Slater, \{M. W.\} and Wotton, \{S. A.\} and R. Arcidiacono and G. Bocquet and A. Ceccucci and D. Cundy and N. Doble and V. Falaleev and L. Gatignon and A. Gonidec and P. Grafstr{\"o}m and W. Kubischta and I. Mikulec and A. Norton and B. Panzer-Steindel and P. Rubin and H. Wahl and E. Goudzovski and P. Hristov and V. Kekelidze and L. Litov and D. Madigozhin and N. Molokanova and Yu Potrebenikov and S. Stoynev and A. Zinchenko and E. Monnier and E. Swallow and R. Winston and R. Sacco and A. Walker and W. Baldini and P. Dalpiaz and Frabetti, \{P. L.\} and A. Gianoli and M. Martini and F. Petrucci and M. Savri{\'e} and M. Scarpa and A. Bizzeti and M. Calvetti and G. Collazuol and E. Iacopini and M. Lenti and G. Ruggiero and M. Veltri and M. Behler and K. Eppard and M. Eppard and A. Hirstius and K. Kleinknecht and U. Koch and P. Marouelli and L. Masetti and U. Moosbrugger and \{Morales Morales\}, C. and A. Peters and R. Wanke and A. Winhart and A. Dabrowski and \{Fonseca Martin\}, T. and M. Velasco and G. Anzivino and P. Cenci and E. Imbergamo and G. Lamanna and P. Lubrano and A. Michetti and A. Nappi and M. Pepe and Petrucci, \{M. C.\} and M. Piccini and M. Valdata and C. Cerri and F. Costantini and R. Fantechi and L. Fiorini and S. Giudici and I. Mannelli and G. Pierazzini and M. Sozzi and C. Cheshkov and Cheze, \{J. B.\} and \{De Beer\}, M. and P. Debu and G. Gouge and G. Marel and E. Mazzucato and B. Peyaud and B. Vallage and M. Holder and A. Maier and M. Ziolkowski and C. Biino and N. Cartiglia and M. Clemencic and \{Goy Lopez\}, S. and F. Marchetto and E. Menichetti and N. Pastrone and W. Wislicki and H. Dibon and M. Jeitler and M. Markytan and G. Neuhofer and L. Widhalm",

year = "2007",

month = jun,

day = "21",

doi = "10.1016/j.physletb.2007.04.066",

language = "English",

volume = "650",

pages = "1--8",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier BV",

number = "1",

}

Batley, JR, Kalmus, GE, Lazzeroni, C, Munday, DJ, Patel, M, Slater, MW, Wotton, SA, Arcidiacono, R, Bocquet, G, Ceccucci, A, Cundy, D, Doble, N, Falaleev, V, Gatignon, L, Gonidec, A, Grafström, P, Kubischta, W, Mikulec, I, Norton, A, Panzer-Steindel, B, Rubin, P, Wahl, H, Goudzovski, E, Hristov, P, Kekelidze, V, Litov, L, Madigozhin, D, Molokanova, N, Potrebenikov, Y, Stoynev, S, Zinchenko, A, Monnier, E, Swallow, E, Winston, R, Sacco, R, Walker, A, Baldini, W, Dalpiaz, P, Frabetti, PL, Gianoli, A, Martini, M, Petrucci, F, Savrié, M, Scarpa, M, Bizzeti, A, Calvetti, M, Collazuol, G, Iacopini, E, Lenti, M, Ruggiero, G, Veltri, M, Behler, M, Eppard, K, Eppard, M, Hirstius, A, Kleinknecht, K, Koch, U, Marouelli, P, Masetti, L, Moosbrugger, U, Morales Morales, C, Peters, A, Wanke, R, Winhart, A, Dabrowski, A, Fonseca Martin, T, Velasco, M, Anzivino, G, Cenci, P, Imbergamo, E, Lamanna, G, Lubrano, P, Michetti, A, Nappi, A, Pepe, M, Petrucci, MC, Piccini, M, Valdata, M, Cerri, C, Costantini, F, Fantechi, R, Fiorini, L, Giudici, S, Mannelli, I, Pierazzini, G, Sozzi, M, Cheshkov, C, Cheze, JB, De Beer, M, Debu, P, Gouge, G, Marel, G, Mazzucato, E, Peyaud, B, Vallage, B, Holder, M, Maier, A, Ziolkowski, M, Biino, C, Cartiglia, N, Clemencic, M, Goy Lopez, S, Marchetto, F, Menichetti, E, Pastrone, N, Wislicki, W, Dibon, H, Jeitler, M, Markytan, M, Neuhofer, G & Widhalm, L 2007, 'First observation and branching fraction and decay parameter measurements of the weak radiative decay Ξ⁰ → Λ e⁺ e^-', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 650, no. 1, pp. 1-8. https://doi.org/10.1016/j.physletb.2007.04.066

TY - JOUR

T1 - First observation and branching fraction and decay parameter measurements of the weak radiative decay Ξ0 → Λ e+ e-

AU - Batley, J. R.

AU - Kalmus, G. E.

AU - Lazzeroni, C.

AU - Munday, D. J.

AU - Patel, M.

AU - Slater, M. W.

AU - Wotton, S. A.

AU - Arcidiacono, R.

AU - Bocquet, G.

AU - Ceccucci, A.

AU - Cundy, D.

AU - Doble, N.

AU - Falaleev, V.

AU - Gatignon, L.

AU - Gonidec, A.

AU - Grafström, P.

AU - Kubischta, W.

AU - Mikulec, I.

AU - Norton, A.

AU - Panzer-Steindel, B.

AU - Rubin, P.

AU - Wahl, H.

AU - Goudzovski, E.

AU - Hristov, P.

AU - Kekelidze, V.

AU - Litov, L.

AU - Madigozhin, D.

AU - Molokanova, N.

AU - Potrebenikov, Yu

AU - Stoynev, S.

AU - Zinchenko, A.

AU - Monnier, E.

AU - Swallow, E.

AU - Winston, R.

AU - Sacco, R.

AU - Walker, A.

AU - Baldini, W.

AU - Dalpiaz, P.

AU - Frabetti, P. L.

AU - Gianoli, A.

AU - Martini, M.

AU - Petrucci, F.

AU - Savrié, M.

AU - Scarpa, M.

AU - Bizzeti, A.

AU - Calvetti, M.

AU - Collazuol, G.

AU - Iacopini, E.

AU - Lenti, M.

AU - Ruggiero, G.

AU - Veltri, M.

AU - Behler, M.

AU - Eppard, K.

AU - Eppard, M.

AU - Hirstius, A.

AU - Kleinknecht, K.

AU - Koch, U.

AU - Marouelli, P.

AU - Masetti, L.

AU - Moosbrugger, U.

AU - Morales Morales, C.

AU - Peters, A.

AU - Wanke, R.

AU - Winhart, A.

AU - Dabrowski, A.

AU - Fonseca Martin, T.

AU - Velasco, M.

AU - Anzivino, G.

AU - Cenci, P.

AU - Imbergamo, E.

AU - Lamanna, G.

AU - Lubrano, P.

AU - Michetti, A.

AU - Nappi, A.

AU - Pepe, M.

AU - Petrucci, M. C.

AU - Piccini, M.

AU - Valdata, M.

AU - Cerri, C.

AU - Costantini, F.

AU - Fantechi, R.

AU - Fiorini, L.

AU - Giudici, S.

AU - Mannelli, I.

AU - Pierazzini, G.

AU - Sozzi, M.

AU - Cheshkov, C.

AU - Cheze, J. B.

AU - De Beer, M.

AU - Debu, P.

AU - Gouge, G.

AU - Marel, G.

AU - Mazzucato, E.

AU - Peyaud, B.

AU - Vallage, B.

AU - Holder, M.

AU - Maier, A.

AU - Ziolkowski, M.

AU - Biino, C.

AU - Cartiglia, N.

AU - Clemencic, M.

AU - Goy Lopez, S.

AU - Marchetto, F.

AU - Menichetti, E.

AU - Pastrone, N.

AU - Wislicki, W.

AU - Dibon, H.

AU - Jeitler, M.

AU - Markytan, M.

AU - Neuhofer, G.

AU - Widhalm, L.

PY - 2007/6/21

Y1 - 2007/6/21

N2 - The weak radiative decay Ξ0 → Λ e+ e- has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of 15 ± 5 events. We determine the branching fraction B (Ξ0 → Λ e+ e-) = [7.6 ± 0.4 (stat) ± 0.4 (syst) ± 0.2 (norm)] × 10-6, consistent with an internal bremsstrahlung process, and the decay asymmetry parameter αΞ Λ e e = - 0.8 ± 0.2, consistent with that of Ξ0 → Λ γ. The charge conjugate reaction over(Ξ0, -) → over(Λ, -) e+ e- has also been observed.

AB - The weak radiative decay Ξ0 → Λ e+ e- has been detected for the first time. We find 412 candidates in the signal region, with an estimated background of 15 ± 5 events. We determine the branching fraction B (Ξ0 → Λ e+ e-) = [7.6 ± 0.4 (stat) ± 0.4 (syst) ± 0.2 (norm)] × 10-6, consistent with an internal bremsstrahlung process, and the decay asymmetry parameter αΞ Λ e e = - 0.8 ± 0.2, consistent with that of Ξ0 → Λ γ. The charge conjugate reaction over(Ξ0, -) → over(Λ, -) e+ e- has also been observed.

UR - https://www.scopus.com/pages/publications/34249996737

U2 - 10.1016/j.physletb.2007.04.066

DO - 10.1016/j.physletb.2007.04.066

M3 - Article

SN - 0370-2693

VL - 650

SP - 1

EP - 8

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1

ER -

First observation and branching fraction and decay parameter measurements of the weak radiative decay Ξ⁰ → Λ e⁺ e^-

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