Search for evidence of (3)(Lambda)n by observing d + pi(-) and t + pi(-) final states in the reaction of Li-6+C-12 at 2A GeV

C. Rappold; E. Kim; T. R. Saito; O. Bertini; S. Bianchin; V. Bozkurt; M. Kavatsyuk; Y. Ma; F. Maas; S. Minami; D. Nakajima; B. Oezel-Tashenov; K. Yoshida; P. Achenbach; S. Ajimura; T. Aumann; C. Ayerbe Gayoso; H. C. Bhang; C. Caesar; S. Erturk; T. Fukuda; B. Gokuzum; E. Guliev; J. Hoffmann; G. Ickert; Z. S. Ketenci; D. Khaneft; M. Kim; S. Kim; K. Koch; N. Kurz; A. Le Fevre; Y. Mizoi; L. Nungesser; W. Ott; J. Pochodzalla; A. Sakaguchi; C. J. Schmidt; M. Sekimoto; H. Simon; T. Takahashi; G. J. Tambave; H. Tamura; W. Trautmann; S. Voltz; C. J. Yoon; HypHI Collaboration

doi:10.1103/PhysRevC.88.041001

Search for evidence of (3)(Lambda)n by observing d + pi(-) and t + pi(-) final states in the reaction of Li-6+C-12 at 2A GeV

C. Rappold^*, E. Kim, T. R. Saito, O. Bertini, S. Bianchin, V. Bozkurt, M. Kavatsyuk, Y. Ma, F. Maas, S. Minami, D. Nakajima, B. Oezel-Tashenov, K. Yoshida, P. Achenbach, S. Ajimura, T. Aumann, C. Ayerbe Gayoso, H. C. Bhang, C. Caesar, S. ErturkT. Fukuda, B. Gokuzum, E. Guliev, J. Hoffmann, G. Ickert, Z. S. Ketenci, D. Khaneft, M. Kim, S. Kim, K. Koch, N. Kurz, A. Le Fevre, Y. Mizoi, L. Nungesser, W. Ott, J. Pochodzalla, A. Sakaguchi, C. J. Schmidt, M. Sekimoto, H. Simon, T. Takahashi, G. J. Tambave, H. Tamura, W. Trautmann, S. Voltz, C. J. Yoon, HypHI Collaboration

^*Corresponding author for this work

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

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Abstract

The experimental data obtained from the reaction of Li-6 projectiles at 2A GeV on a fixed graphite target were analyzed to study the invariant mass distributions of d + pi(-) and t + pi(-). Indications of a signal in the d + pi(-) and t + pi(-) invariant mass distributions were observed with significances of 5.3 sigma and 5.0 sigma, respectively, when including the production target, and 3.7 sigma and 5.2 sigma, respectively, when excluding the target. The estimated mean values of the invariant mass for d + pi(-) and t + pi(-) signal were 2059.3 +/- 1.3 +/- 1.7 MeV/c(2) and 2993.7 +/- 1.3 +/- 0.6 MeV/c(2) respectively. The lifetime estimation of the possible bound states yielding to d + pi(-) and t + pi(-) final states were deduced to be as 181(-24)(+30) +/- 25 ps and 190(-35)(+47) +/- 36 ps, respectively. Those final states may be interpreted as the two-body and three-body decay modes of a neutral bound state of two neutrons and a Lambda hyperon, (3)(Lambda)n.

Original language	English
Article number	041001
Number of pages	6
Journal	Physical Review C
Volume	88
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.88.041001
Publication status	Published - 10-Oct-2013

Keywords

HEAVY-ION COLLISIONS
LIGHT HYPERNUCLEI
SYSTEMATIC-ERRORS
LAMBDA
DECAY
SPECTROSCOPY
LI-7(LAMBDA)
HYPERTRITON

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Rappold, C., Kim, E., Saito, T. R., Bertini, O., Bianchin, S., Bozkurt, V., Kavatsyuk, M., Ma, Y., Maas, F., Minami, S., Nakajima, D., Oezel-Tashenov, B., Yoshida, K., Achenbach, P., Ajimura, S., Aumann, T., Gayoso, C. A., Bhang, H. C., Caesar, C., ... HypHI Collaboration (2013). Search for evidence of (3)(Lambda)n by observing d + pi(-) and t + pi(-) final states in the reaction of Li-6+C-12 at 2A GeV. Physical Review C, 88(4), Article 041001. https://doi.org/10.1103/PhysRevC.88.041001

@article{26ae2a348a5144cdb30913921673b19b,

title = "Search for evidence of (3)(Lambda)n by observing d + pi(-) and t + pi(-) final states in the reaction of Li-6+C-12 at 2A GeV",

abstract = "The experimental data obtained from the reaction of Li-6 projectiles at 2A GeV on a fixed graphite target were analyzed to study the invariant mass distributions of d + pi(-) and t + pi(-). Indications of a signal in the d + pi(-) and t + pi(-) invariant mass distributions were observed with significances of 5.3 sigma and 5.0 sigma, respectively, when including the production target, and 3.7 sigma and 5.2 sigma, respectively, when excluding the target. The estimated mean values of the invariant mass for d + pi(-) and t + pi(-) signal were 2059.3 +/- 1.3 +/- 1.7 MeV/c(2) and 2993.7 +/- 1.3 +/- 0.6 MeV/c(2) respectively. The lifetime estimation of the possible bound states yielding to d + pi(-) and t + pi(-) final states were deduced to be as 181(-24)(+30) +/- 25 ps and 190(-35)(+47) +/- 36 ps, respectively. Those final states may be interpreted as the two-body and three-body decay modes of a neutral bound state of two neutrons and a Lambda hyperon, (3)(Lambda)n.",

keywords = "HEAVY-ION COLLISIONS, LIGHT HYPERNUCLEI, SYSTEMATIC-ERRORS, LAMBDA, DECAY, SPECTROSCOPY, LI-7(LAMBDA), HYPERTRITON",

author = "C. Rappold and E. Kim and Saito, {T. R.} and O. Bertini and S. Bianchin and V. Bozkurt and M. Kavatsyuk and Y. Ma and F. Maas and S. Minami and D. Nakajima and B. Oezel-Tashenov and K. Yoshida and P. Achenbach and S. Ajimura and T. Aumann and Gayoso, {C. Ayerbe} and Bhang, {H. C.} and C. Caesar and S. Erturk and T. Fukuda and B. Gokuzum and E. Guliev and J. Hoffmann and G. Ickert and Ketenci, {Z. S.} and D. Khaneft and M. Kim and S. Kim and K. Koch and N. Kurz and {Le Fevre}, A. and Y. Mizoi and L. Nungesser and W. Ott and J. Pochodzalla and A. Sakaguchi and Schmidt, {C. J.} and M. Sekimoto and H. Simon and T. Takahashi and Tambave, {G. J.} and H. Tamura and W. Trautmann and S. Voltz and Yoon, {C. J.} and {HypHI Collaboration}",

year = "2013",

month = oct,

day = "10",

doi = "10.1103/PhysRevC.88.041001",

language = "English",

volume = "88",

journal = "Physical Review C",

issn = "0556-2813",

publisher = "AMER PHYSICAL SOC",

number = "4",

}

Rappold, C, Kim, E, Saito, TR, Bertini, O, Bianchin, S, Bozkurt, V, Kavatsyuk, M, Ma, Y, Maas, F, Minami, S, Nakajima, D, Oezel-Tashenov, B, Yoshida, K, Achenbach, P, Ajimura, S, Aumann, T, Gayoso, CA, Bhang, HC, Caesar, C, Erturk, S, Fukuda, T, Gokuzum, B, Guliev, E, Hoffmann, J, Ickert, G, Ketenci, ZS, Khaneft, D, Kim, M, Kim, S, Koch, K, Kurz, N, Le Fevre, A, Mizoi, Y, Nungesser, L, Ott, W, Pochodzalla, J, Sakaguchi, A, Schmidt, CJ, Sekimoto, M, Simon, H, Takahashi, T, Tambave, GJ, Tamura, H, Trautmann, W, Voltz, S, Yoon, CJ & HypHI Collaboration 2013, 'Search for evidence of (3)(Lambda)n by observing d + pi(-) and t + pi(-) final states in the reaction of Li-6+C-12 at 2A GeV', Physical Review C, vol. 88, no. 4, 041001. https://doi.org/10.1103/PhysRevC.88.041001

TY - JOUR

T1 - Search for evidence of (3)(Lambda)n by observing d + pi(-) and t + pi(-) final states in the reaction of Li-6+C-12 at 2A GeV

AU - Rappold, C.

AU - Kim, E.

AU - Saito, T. R.

AU - Bertini, O.

AU - Bianchin, S.

AU - Bozkurt, V.

AU - Kavatsyuk, M.

AU - Ma, Y.

AU - Maas, F.

AU - Minami, S.

AU - Nakajima, D.

AU - Oezel-Tashenov, B.

AU - Yoshida, K.

AU - Achenbach, P.

AU - Ajimura, S.

AU - Aumann, T.

AU - Gayoso, C. Ayerbe

AU - Bhang, H. C.

AU - Caesar, C.

AU - Erturk, S.

AU - Fukuda, T.

AU - Gokuzum, B.

AU - Guliev, E.

AU - Hoffmann, J.

AU - Ickert, G.

AU - Ketenci, Z. S.

AU - Khaneft, D.

AU - Kim, M.

AU - Kim, S.

AU - Koch, K.

AU - Kurz, N.

AU - Le Fevre, A.

AU - Mizoi, Y.

AU - Nungesser, L.

AU - Ott, W.

AU - Pochodzalla, J.

AU - Sakaguchi, A.

AU - Schmidt, C. J.

AU - Sekimoto, M.

AU - Simon, H.

AU - Takahashi, T.

AU - Tambave, G. J.

AU - Tamura, H.

AU - Trautmann, W.

AU - Voltz, S.

AU - Yoon, C. J.

AU - HypHI Collaboration

PY - 2013/10/10

Y1 - 2013/10/10

N2 - The experimental data obtained from the reaction of Li-6 projectiles at 2A GeV on a fixed graphite target were analyzed to study the invariant mass distributions of d + pi(-) and t + pi(-). Indications of a signal in the d + pi(-) and t + pi(-) invariant mass distributions were observed with significances of 5.3 sigma and 5.0 sigma, respectively, when including the production target, and 3.7 sigma and 5.2 sigma, respectively, when excluding the target. The estimated mean values of the invariant mass for d + pi(-) and t + pi(-) signal were 2059.3 +/- 1.3 +/- 1.7 MeV/c(2) and 2993.7 +/- 1.3 +/- 0.6 MeV/c(2) respectively. The lifetime estimation of the possible bound states yielding to d + pi(-) and t + pi(-) final states were deduced to be as 181(-24)(+30) +/- 25 ps and 190(-35)(+47) +/- 36 ps, respectively. Those final states may be interpreted as the two-body and three-body decay modes of a neutral bound state of two neutrons and a Lambda hyperon, (3)(Lambda)n.

AB - The experimental data obtained from the reaction of Li-6 projectiles at 2A GeV on a fixed graphite target were analyzed to study the invariant mass distributions of d + pi(-) and t + pi(-). Indications of a signal in the d + pi(-) and t + pi(-) invariant mass distributions were observed with significances of 5.3 sigma and 5.0 sigma, respectively, when including the production target, and 3.7 sigma and 5.2 sigma, respectively, when excluding the target. The estimated mean values of the invariant mass for d + pi(-) and t + pi(-) signal were 2059.3 +/- 1.3 +/- 1.7 MeV/c(2) and 2993.7 +/- 1.3 +/- 0.6 MeV/c(2) respectively. The lifetime estimation of the possible bound states yielding to d + pi(-) and t + pi(-) final states were deduced to be as 181(-24)(+30) +/- 25 ps and 190(-35)(+47) +/- 36 ps, respectively. Those final states may be interpreted as the two-body and three-body decay modes of a neutral bound state of two neutrons and a Lambda hyperon, (3)(Lambda)n.

KW - HEAVY-ION COLLISIONS

KW - LIGHT HYPERNUCLEI

KW - SYSTEMATIC-ERRORS

KW - LAMBDA

KW - DECAY

KW - SPECTROSCOPY

KW - LI-7(LAMBDA)

KW - HYPERTRITON

U2 - 10.1103/PhysRevC.88.041001

DO - 10.1103/PhysRevC.88.041001

M3 - Article

SN - 0556-2813

VL - 88

JO - Physical Review C

JF - Physical Review C

IS - 4

M1 - 041001

ER -

Search for evidence of (3)(Lambda)n by observing d + pi(-) and t + pi(-) final states in the reaction of Li-6+C-12 at 2A GeV

Abstract

Keywords

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