We observe a signal for the doubly charmed baryon Xi(cc)(+) in the decay mode Xi(cc)(+) -> pD(+)K(-) to complement the previous cc reported decay Xi(cc)(+) -> Lambda(c)(+)K(-)pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. In this new decay mode we observe an excess of 5.62 events over a combinatoric background estimated by event mixing to be 1.38 +/- 0.13 events. The mixed background has Gaussian statistics, giving a signal significance of 4.8 sigma. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4 x 10(-4). The observed mass of this state is 3518 +/- 3 MeV/c(2), consistent with the published result. Averaging the two results gives a mass of 3518.7 +/- 1.7 MeV/c(2). The observation of this new weak decay mode confirms the previous SELEX suggestion that this state is a double charm baryon. The relative branching ratio for these two modes is 0.36 +/- 0.21. (c) 2005 Elsevier B.V. All rights reserved.

Confirmation of the doubly charmed baryon Epsilon(+)(cc)(3520) via its decay to pD(+)K(-) / A., Ocherashvili; M. A., Moinester; J., Russ; J., Engelfried; I., Torres; U., Akgun; G., Alkhazov; J., Amaro Reyes; A. G., Atamantchouk; A. S., Ayan; M. Y., Balatz; N. F., Bondar; P. S., Cooper; L. J., Dauwe; G. V., Davidenko; U., Dersch; A. G., Dolgolenko; G. B., Dzyubenko; R., Edelstein; L., Emediato; A. M. E., Endler; I., Eschrich; C. O., Escobar; A. V., Evdokimov; I. S., Filimonov; F. G., Garcia; Gaspero, Mario; I., Giller; V. L., Golovtsov; P., Gouffon; E., Gulmez; H., Kangling; M., Iori; S. Y., Jun; M., Kaya; J., Kilmer; V. T., Kim; L. M., Kochenda; I., Konorov; A. P., Kozhevnikov; A. G., Krivshich; H., Kruger; M. A., Kubantsev; V., Kubarovsky; A. I., Kulyavtsev; N. P., Kuropatkin; V. F., Kurshetsov; A., Kushnirenko; S., Kwan; J., Lach; A., Lamberto; L. G., Landsberg; I., Larin; E. M., Leikin; Y. S., Li; M., Luksys; T., Lungov; V. P., Maleev; D., Mao; C. S., Mao; Z. L., Mao; P., Mathew; M., Mattson; V., Matveev; E., Mccliment; V. V., Molchanov; A., Morelos; K. D., Nelson; A. V., Nemitkin; P. V., Neoustroev; C., Newsom; A. P., Nilov; S. B., Nurushev; Y., Onel; E., Ozel; S., Ozkorucuklu; A., Penzo; S. V., Petrenko; P., Pogodin; M., Procario; V. A., Prutskoi; E., Ramberg; G. F., Rappazzo; B. V., Razmyslovich; V. I., Rud; P., Schiavon; J., Simon; A. I., Sitnikov; D., Skow; V. J., Smith; M., Srivastava; V., Steiner; V., Stepanov; L., Stutte; M., Svoiski; N. K., Terentyev; Thomas, Gp; L. N., Uvarov; A. N., Vasiliev; D. V., Vavilov; E., Vazquez Jauregui; V. S., Verebryusov; V. A., Victorov; V. E., Vishnyakov; A. A., Vorobyov; K., Vorwalter; J., You; W. H., Zhao; S. C., Zheng; R., Zukanovich Funchal. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 628:(2005), pp. 18-24. [10.1016/j.physletb.2005.09.043]

Confirmation of the doubly charmed baryon Epsilon(+)(cc)(3520) via its decay to pD(+)K(-)

GASPERO, Mario;
2005

Abstract

We observe a signal for the doubly charmed baryon Xi(cc)(+) in the decay mode Xi(cc)(+) -> pD(+)K(-) to complement the previous cc reported decay Xi(cc)(+) -> Lambda(c)(+)K(-)pi(+) in data from SELEX, the charm hadroproduction experiment at Fermilab. In this new decay mode we observe an excess of 5.62 events over a combinatoric background estimated by event mixing to be 1.38 +/- 0.13 events. The mixed background has Gaussian statistics, giving a signal significance of 4.8 sigma. The Poisson probability that a background fluctuation can produce the apparent signal is less than 6.4 x 10(-4). The observed mass of this state is 3518 +/- 3 MeV/c(2), consistent with the published result. Averaging the two results gives a mass of 3518.7 +/- 1.7 MeV/c(2). The observation of this new weak decay mode confirms the previous SELEX suggestion that this state is a double charm baryon. The relative branching ratio for these two modes is 0.36 +/- 0.21. (c) 2005 Elsevier B.V. All rights reserved.
2005
doubly charmed baryon
01 Pubblicazione su rivista::01a Articolo in rivista
Confirmation of the doubly charmed baryon Epsilon(+)(cc)(3520) via its decay to pD(+)K(-) / A., Ocherashvili; M. A., Moinester; J., Russ; J., Engelfried; I., Torres; U., Akgun; G., Alkhazov; J., Amaro Reyes; A. G., Atamantchouk; A. S., Ayan; M. Y., Balatz; N. F., Bondar; P. S., Cooper; L. J., Dauwe; G. V., Davidenko; U., Dersch; A. G., Dolgolenko; G. B., Dzyubenko; R., Edelstein; L., Emediato; A. M. E., Endler; I., Eschrich; C. O., Escobar; A. V., Evdokimov; I. S., Filimonov; F. G., Garcia; Gaspero, Mario; I., Giller; V. L., Golovtsov; P., Gouffon; E., Gulmez; H., Kangling; M., Iori; S. Y., Jun; M., Kaya; J., Kilmer; V. T., Kim; L. M., Kochenda; I., Konorov; A. P., Kozhevnikov; A. G., Krivshich; H., Kruger; M. A., Kubantsev; V., Kubarovsky; A. I., Kulyavtsev; N. P., Kuropatkin; V. F., Kurshetsov; A., Kushnirenko; S., Kwan; J., Lach; A., Lamberto; L. G., Landsberg; I., Larin; E. M., Leikin; Y. S., Li; M., Luksys; T., Lungov; V. P., Maleev; D., Mao; C. S., Mao; Z. L., Mao; P., Mathew; M., Mattson; V., Matveev; E., Mccliment; V. V., Molchanov; A., Morelos; K. D., Nelson; A. V., Nemitkin; P. V., Neoustroev; C., Newsom; A. P., Nilov; S. B., Nurushev; Y., Onel; E., Ozel; S., Ozkorucuklu; A., Penzo; S. V., Petrenko; P., Pogodin; M., Procario; V. A., Prutskoi; E., Ramberg; G. F., Rappazzo; B. V., Razmyslovich; V. I., Rud; P., Schiavon; J., Simon; A. I., Sitnikov; D., Skow; V. J., Smith; M., Srivastava; V., Steiner; V., Stepanov; L., Stutte; M., Svoiski; N. K., Terentyev; Thomas, Gp; L. N., Uvarov; A. N., Vasiliev; D. V., Vavilov; E., Vazquez Jauregui; V. S., Verebryusov; V. A., Victorov; V. E., Vishnyakov; A. A., Vorobyov; K., Vorwalter; J., You; W. H., Zhao; S. C., Zheng; R., Zukanovich Funchal. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 628:(2005), pp. 18-24. [10.1016/j.physletb.2005.09.043]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/19736
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