Study of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msubsup><mml:mi>Ω</mml:mi><mml:mi>c</mml:mi><mml:mn>0</mml:mn></mml:msubsup></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:msubsup><mml:mi>Ω</mml:mi><mml:mi>c</mml:mi><mml:mrow><mml:mo>∗</mml:mo><mml:mn>0</mml:mn></mml:mrow></mml:msubsup></mml:math> baryons at Belle

Solovieva, E.; Chistov, R.; Adachi, I.; Aihara, H.; Arinstein, K.; Aushev, T.; Bakich, A. M.; Balagura, V.; Bitenc, U.; Bondar, A.; Bračko, M.; Brodzicka, J.; Browder, T. E.; Chang, P.; Chen, A.; Cheon, B. G.; Cho, I. S.; Choi, S. K.; Choi, Y.; Dalseno, J.; Danilov, M.; Dash, M.; Eidelman, S.; Ha, H.; Hayasaka, K.; Hazumi, M.; Heffernan, D.; Hoshi, Y.; Hou, W.-S.; Hsiung, Y.; Hyun, H. J.; Inami, K.; Ishikawa, A.; Ishino, H.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Kah, D. H.; Kang, J. H.; Katayama, N.; Kawai, H.; Kawasaki, T.; Kichimi, H.; Kim, H. J.; Kim, Y. I.; Kim, Y. J.; Kinoshita, K.; Korpar, S.; Križan, P.; Krokovny, P.; Kumar, Rajeev; Kuzmin, A.; Kwon, Y.; Kyeong, S. H.; Lange, J. S.; Lee, J. S.; Lee, M. J.; Lee, S. E.; Lesiak, T.; Liu, C.; Liventsev, D.; Matyja, A.; McOnie, S.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Nagasaka, Y.; Nakao, M.; Nishida, S.; Nitoh, O.; Noguchi, S.; Ogawa, S.; Ohshima, T.; Okuno, S.; Pakhlov, P.; Pakhlova, G.; Pałka, H.; Park, H. K.; Peak, L. S.; Piilonen, L. E.; Sahoo, H.; Sakai, Y.; Schneider, O.; Schwanda, C.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shiu, J. G.; Stanič, S.; Starič, M.; Sumiyoshi, T.; Tanaka, M.; Taylor, G. N.; Teramoto, Y.; Tikhomirov, I.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Varner, G.; Wang, C. H.; Wang, P.; Wang, X. L.; Watanabe, Y.; Won, E.; Yabsley, B.; Yamashita, Y.; Yamauchi, M.; Zhang, Z. P.; Zhulanov, V.; Živko, T.; Zupanc, A.; Zyukova, O.

doi:10.1016/j.physletb.2008.12.062

Cited by 68 publications

(53 citation statements)

References 21 publications

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“…The Ω * 0 c is too light to undergo strong decay and so decays purely to Ω 0 c γ. It was discovered by BaBar [14] and confirmed by Belle [13]. Both measured the mass difference m(Ω * 0 c ) − m(Ω 0 c ), and the two results are in excellent agreement with each other as well as with most theoretical predictions [15].…”

Section: ω C Familysupporting

confidence: 70%

“…The weakly-decaying Ω 0 c (J = 1/2 + ) had been seen in a number of different decay modes and production environments, but with only limited statistics (typically samples of O(10) events in a given decay mode, and never more than 100); and the J = 3/2 + Ω * 0 c had not been observed. Belle carried out a precise measurement of the Ω 0 c mass using a sample of 725 decays to the Ω − π + final state [13], obtaining (2693.6 ± 0.3 +1.8 −1.5 ) MeV/c 2 . The short list of known doubly strange charmed baryons is summarized in Table 2.…”

Section: ω C Familymentioning

confidence: 99%

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Strange Charmed Baryons Spectroscopy

Solovieva

2017

EPJ Web Conf.

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Section: ω C Familysupporting

confidence: 70%

Section: ω C Familymentioning

confidence: 99%

Strange Charmed Baryons Spectroscopy

Solovieva

2017

EPJ Web Conf.

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“…The Ω c γ spectrum has been studied by BaBar [34] and Belle [35] in reporting the existence of the Ω * 0 c , a candidate for the J P = 3/2 + partner of the Ω 0 c . The BaBar spectrum shows no peak above the Ω * 0 c , up to a mass of 3 GeV, while Belle only presents a spectrum up to an excitation energy of 0.2 GeV, again showing no peak besides the Ω * 0 c .…”

Section: Alternative Interpretationsmentioning

confidence: 99%

“…The prediction of a state around 2904 MeV should be easy to confirm or refute by studying the Ω c γ and Ω c π 0 spectra. As mentioned, these were studied by Belle [35], but only up to a mass of about 2900 MeV, and by BaBar [34], with no evidence for a signal.…”

Section: Alternative Interpretationsmentioning

confidence: 99%

Very narrow excited Ωc baryons

2017

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Recently LHCb reported the discovery of five extremely narrow excited Ω c baryons decaying into Ξ + c K − . We interpret these baryons as bound states of a c-quark and a P -wave ss-diquark. For such a system there are exactly five possible combinations of spin and orbital angular momentum. The narrowness of the states could be a signal that it is hard to pull apart the two s-quarks in a diquark. We predict two of spin 1/2, two of spin 3/2, and one of spin 5/2, all with negative parity. Of the five states two can decay in S-wave and three can decay in D-wave. Some of the D-wave states might be narrower than the S-wave states. We discuss relations among the five masses expected in the quark model and the likely spin assignments and compare with the data. A similar pattern is expected for negative-parity excited Ω b states. An alternative interpretation is noted in which the heaviest two states are 2S excitations with J P = 1/2 + and 3/2 + , while the lightest three are those with J P = 3/2 − , 3/2 − , 5/2 − expected to decay via D-waves. In this case we expect J P = 1/2 − Ω c states around 2904 and 2978 MeV.PACS codes: 12.39. Jh, 13.20.Jf, 13.25.Jx, 14.40 The proposed values of spin-parity J P are ours. An alternative set of assignments is shown in parentheses.State Mass (MeV) a Width (MeV) Proposed J P Ω c (3000) 0 3000.4 ± 0.2 ± 0.1 4.5 ± 0.6 ± 0.3 1/2 − (3/2 − ) Ω c (3050) 0 3050.2 ± 0.1 ± 0.1 0.8 ± 0.2 ± 0.1 1/2 − (3/2 − ) < 1.2 MeV, 95% CL Ω c (3066) 0 3065.6 ± 0.1 ± 0.3 3.5 ± 0.4 ± 0.2 3/2 − (5/2 − ) Ω c (3090) 0 3090.2 ± 0.3 ± 0.5 8.7 ± 1.0 ± 0.8 3/2 − (1/2 + ) Ω c (3119) 0 3119.1 ± 0.3 ± 0.91.1 ± 0.8 ± 0.4 5/2 − (3/2 + ) < 2.6 MeV, 95% CL a Additional common error of +0.3,-0.5 MeV from M (Ξ + c ) uncertainty. I IntroductionVery recently LHCb reported the discovery of five extremely narrow excited Ω c baryons decaying into Ξ + c K − [1], with masses and widths shown in Table I. We quote also our favored spin-parity assignment for these states, which we shall choose among the 5! = 120 possible permutations if all five states are P -wave excitations of the ss diquark with respect to the charmed quark. Some more recent calculations [2-6] that appeared after the first version of this paper reach the same conclusion. In parentheses we note an alternative assignment if the two heaviest states are 2S excitations.This discovery raises some immediate questions, which we address in detail: In Sec. II we comment on P -wave css baryons. We then analyze spin-dependent forces for the css system in Sec. III, building upon similar results [7] obtained previously for the negative-parity Σ c states. We evaluate the energy cost for a P -wave css excitation in Sec. IV, carry our results over to the Ω b system in Sec. V, discuss alternative interpretations of the spectrum in Sec. VI, and conclude in Sec. VII. Details of calculating the spin-dependent mass shifts are presented in Appendix A, with a linearized approximation in Appendix B.II P -wave c(ss) system Consider the (ss) in c(ss) to be an S-wave color3 c diquark....

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“…Later it was confirmed in the electron-positron collider experiment [4] and the photon beam experiment [5]. The excited state Ω 0 c (2770) with I(J P ) = 0( 3 2 + ) was first observed in the radiative decay Ω 0 c (2770) → Ω 0 c (2695) + γ by the BaBar Collaboration [6], and then confirmed by the Belle Collaboration [7].…”

Section: Introductionmentioning

confidence: 95%