Search for the Θ+ (1530) pentaquark in antiproton 4He annihilation at rest

A. Panzarasa; G. Bendiscioli; A. Fontana; L. Lavezzi; P. Montagna; A. Rotondi; P. Salvini; E. Botta; T. Bressani; S. Costa; D. Calvo; A. Feliciello; A. Filippi; S. Marcello; M. Agnello; F. Iazzi; B. Minetti; E. Lodi Rizzini; M. Corradini; L. Venturelli; A. Zenoni; A. Donzella; F. Balestra; M. P. Bussa; L. Busso; P. Cerello; O. Denisov; L. Ferrero; R. Garfagnini; A. Grasso; A. Maggiora; F. Tosello; D. Panzieri; O. E. Gorchakov; S. N. Prakhov; A. M. Rozhdestvensky; G. M. Sapozhnikov; V. I. Tretyak; C. Cicalò; A. De Falco; A. Masoni; G. Puddu; S. Serci; G. Usai; C. Curceanu (Petrascu); P. Gianotti; C. Guaraldo; A. Lanaro; V. Lucherini

doi:10.1016/j.nuclphysa.2006.08.006

Search for the Θ⁺ (1530) pentaquark in antiproton ⁴He annihilation at rest

A. Panzarasa, G. Bendiscioli, A. Fontana, L. Lavezzi, P. Montagna, A. Rotondi, P. Salvini, E. Botta, T. Bressani, S. Costa, D. Calvo, A. Feliciello, A. Filippi, S. Marcello, M. Agnello, F. Iazzi, B. Minetti, E. Lodi Rizzini, M. Corradini, L. VenturelliA. Zenoni, A. Donzella, F. Balestra, M. P. Bussa, L. Busso, P. Cerello, O. Denisov, L. Ferrero, R. Garfagnini, A. Grasso, A. Maggiora, F. Tosello, D. Panzieri, O. E. Gorchakov, S. N. Prakhov, A. M. Rozhdestvensky, G. M. Sapozhnikov, V. I. Tretyak, C. Cicalò, A. De Falco, A. Masoni, G. Puddu, S. Serci, G. Usai, C. Curceanu (Petrascu), P. Gianotti, C. Guaraldo, A. Lanaro, V. Lucherini

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

Abstract

A research has been made to look for a signature of the positive-strangeness baryon resonance Θ⁺ (1530), which is expected to decay into p K⁰. A peak is observed in the p π⁺ π^- invariant mass distribution in antiproton- ⁴He annihilation reactions at rest with production of two π⁺ π^- pairs with invariant mass close to the K_S⁰ mass. The annihilation reactions on ⁴He can involve two to four nucleons producing an energy blob characterized by high strangeness content. The peak is centred around 1560.0 ± 3.7 MeV and its width is very narrow. The statistical significance is 2.7; this value is considered of not sufficient significance to claim support of the Θ⁺. The data were collected with the Obelix spectrometer at the LEAR machine of CERN.

Original language	English
Pages (from-to)	116-141
Number of pages	26
Journal	Nuclear Physics A
Volume	779
DOIs	https://doi.org/10.1016/j.nuclphysa.2006.08.006
Publication status	Published - 27 Nov 2006
Externally published	Yes

Keywords

Pentaquark with strangeness S = 1
over(p, ̄)- He annihilation

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10.1016/j.nuclphysa.2006.08.006

Cite this

Panzarasa, A., Bendiscioli, G., Fontana, A., Lavezzi, L., Montagna, P., Rotondi, A., Salvini, P., Botta, E., Bressani, T., Costa, S., Calvo, D., Feliciello, A., Filippi, A., Marcello, S., Agnello, M., Iazzi, F., Minetti, B., Lodi Rizzini, E., Corradini, M., ... Lucherini, V. (2006). Search for the Θ⁺ (1530) pentaquark in antiproton ⁴He annihilation at rest. Nuclear Physics A, 779, 116-141. https://doi.org/10.1016/j.nuclphysa.2006.08.006

@article{cf209fd0fc8245c6b7d537411ac1b02a,

title = "Search for the Θ+ (1530) pentaquark in antiproton 4He annihilation at rest",

abstract = "A research has been made to look for a signature of the positive-strangeness baryon resonance Θ+ (1530), which is expected to decay into p K0. A peak is observed in the p π+ π- invariant mass distribution in antiproton- 4He annihilation reactions at rest with production of two π+ π- pairs with invariant mass close to the KS0 mass. The annihilation reactions on 4He can involve two to four nucleons producing an energy blob characterized by high strangeness content. The peak is centred around 1560.0 ± 3.7 MeV and its width is very narrow. The statistical significance is 2.7; this value is considered of not sufficient significance to claim support of the Θ+. The data were collected with the Obelix spectrometer at the LEAR machine of CERN.",

keywords = "Pentaquark with strangeness S = 1, over(p,{\= })- He annihilation",

author = "A. Panzarasa and G. Bendiscioli and A. Fontana and L. Lavezzi and P. Montagna and A. Rotondi and P. Salvini and E. Botta and T. Bressani and S. Costa and D. Calvo and A. Feliciello and A. Filippi and S. Marcello and M. Agnello and F. Iazzi and B. Minetti and {Lodi Rizzini}, E. and M. Corradini and L. Venturelli and A. Zenoni and A. Donzella and F. Balestra and Bussa, {M. P.} and L. Busso and P. Cerello and O. Denisov and L. Ferrero and R. Garfagnini and A. Grasso and A. Maggiora and F. Tosello and D. Panzieri and Gorchakov, {O. E.} and Prakhov, {S. N.} and Rozhdestvensky, {A. M.} and Sapozhnikov, {G. M.} and Tretyak, {V. I.} and C. Cical{\`o} and {De Falco}, A. and A. Masoni and G. Puddu and S. Serci and G. Usai and {Curceanu (Petrascu)}, C. and P. Gianotti and C. Guaraldo and A. Lanaro and V. Lucherini",

year = "2006",

month = nov,

day = "27",

doi = "10.1016/j.nuclphysa.2006.08.006",

language = "English",

volume = "779",

pages = "116--141",

journal = "Nuclear Physics A",

issn = "0375-9474",

publisher = "Elsevier",

}

Panzarasa, A, Bendiscioli, G, Fontana, A, Lavezzi, L, Montagna, P, Rotondi, A, Salvini, P, Botta, E, Bressani, T, Costa, S, Calvo, D, Feliciello, A, Filippi, A, Marcello, S, Agnello, M, Iazzi, F, Minetti, B, Lodi Rizzini, E, Corradini, M, Venturelli, L, Zenoni, A, Donzella, A, Balestra, F, Bussa, MP, Busso, L, Cerello, P, Denisov, O, Ferrero, L, Garfagnini, R, Grasso, A, Maggiora, A, Tosello, F, Panzieri, D, Gorchakov, OE, Prakhov, SN, Rozhdestvensky, AM, Sapozhnikov, GM, Tretyak, VI, Cicalò, C, De Falco, A, Masoni, A, Puddu, G, Serci, S, Usai, G, Curceanu (Petrascu), C, Gianotti, P, Guaraldo, C, Lanaro, A & Lucherini, V 2006, 'Search for the Θ⁺ (1530) pentaquark in antiproton ⁴He annihilation at rest', Nuclear Physics A, vol. 779, pp. 116-141. https://doi.org/10.1016/j.nuclphysa.2006.08.006

TY - JOUR

T1 - Search for the Θ+ (1530) pentaquark in antiproton 4He annihilation at rest

AU - Panzarasa, A.

AU - Bendiscioli, G.

AU - Fontana, A.

AU - Lavezzi, L.

AU - Montagna, P.

AU - Rotondi, A.

AU - Salvini, P.

AU - Botta, E.

AU - Bressani, T.

AU - Costa, S.

AU - Calvo, D.

AU - Feliciello, A.

AU - Filippi, A.

AU - Marcello, S.

AU - Agnello, M.

AU - Iazzi, F.

AU - Minetti, B.

AU - Lodi Rizzini, E.

AU - Corradini, M.

AU - Venturelli, L.

AU - Zenoni, A.

AU - Donzella, A.

AU - Balestra, F.

AU - Bussa, M. P.

AU - Busso, L.

AU - Cerello, P.

AU - Denisov, O.

AU - Ferrero, L.

AU - Garfagnini, R.

AU - Grasso, A.

AU - Maggiora, A.

AU - Tosello, F.

AU - Panzieri, D.

AU - Gorchakov, O. E.

AU - Prakhov, S. N.

AU - Rozhdestvensky, A. M.

AU - Sapozhnikov, G. M.

AU - Tretyak, V. I.

AU - Cicalò, C.

AU - De Falco, A.

AU - Masoni, A.

AU - Puddu, G.

AU - Serci, S.

AU - Usai, G.

AU - Curceanu (Petrascu), C.

AU - Gianotti, P.

AU - Guaraldo, C.

AU - Lanaro, A.

AU - Lucherini, V.

PY - 2006/11/27

Y1 - 2006/11/27

N2 - A research has been made to look for a signature of the positive-strangeness baryon resonance Θ+ (1530), which is expected to decay into p K0. A peak is observed in the p π+ π- invariant mass distribution in antiproton- 4He annihilation reactions at rest with production of two π+ π- pairs with invariant mass close to the KS0 mass. The annihilation reactions on 4He can involve two to four nucleons producing an energy blob characterized by high strangeness content. The peak is centred around 1560.0 ± 3.7 MeV and its width is very narrow. The statistical significance is 2.7; this value is considered of not sufficient significance to claim support of the Θ+. The data were collected with the Obelix spectrometer at the LEAR machine of CERN.

AB - A research has been made to look for a signature of the positive-strangeness baryon resonance Θ+ (1530), which is expected to decay into p K0. A peak is observed in the p π+ π- invariant mass distribution in antiproton- 4He annihilation reactions at rest with production of two π+ π- pairs with invariant mass close to the KS0 mass. The annihilation reactions on 4He can involve two to four nucleons producing an energy blob characterized by high strangeness content. The peak is centred around 1560.0 ± 3.7 MeV and its width is very narrow. The statistical significance is 2.7; this value is considered of not sufficient significance to claim support of the Θ+. The data were collected with the Obelix spectrometer at the LEAR machine of CERN.

KW - Pentaquark with strangeness S = 1

KW - over(p, ̄)- He annihilation

UR - http://www.scopus.com/inward/record.url?scp=33750159341&partnerID=8YFLogxK

U2 - 10.1016/j.nuclphysa.2006.08.006

DO - 10.1016/j.nuclphysa.2006.08.006

M3 - Article

SN - 0375-9474

VL - 779

SP - 116

EP - 141

JO - Nuclear Physics A

JF - Nuclear Physics A

ER -

Search for the Θ⁺ (1530) pentaquark in antiproton ⁴He annihilation at rest

Abstract

Keywords

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