Observation of two resonancelike structures in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msub><mml:mi>χ</mml:mi><mml:mrow><mml:mi>c</mml:mi><mml:mn>1</mml:mn></mml:mrow></mml:msub></mml:math>mass distribution in exclusive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mover accent="true"><mml:mi>B</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup><mml:mo

Mizuk, R.; Chistov, R.; Adachi, I.; Aihara, H.; Arinstein, K.; Aulchenko, V.; Aushev, T.; Bakich, A. M.; Balagura, V.; Barberio, E. L.; Bay, A.; Bhardwaj, V.; Bitenc, U.; Bondar, A.; Bożek, A.; Bračko, M.; Brodzicka, J.; Browder, T. E.; Chang, M. C.; Chang, P.; Chen, A.; Chen, K. F.; Cheon, B. G.; Chiang, C. C.; Cho, I. S.; Choi, S. K.; Choi, Y.; Dalseno, J.; Danilov, M.; Drutskoy, A.; Eidelman, S.; Epifanov, D.; Goldenzweig, P.; Golob, B.; Ha, H.; Haba, J.; Hayasaka, K.; Hayashii, H.; Hazumi, M.; Hoshi, Y.; Hou, W.-S.; Hsiung, Y.; Hyun, H. J.; Iijima, T.; Inami, K.; Ishikawa, A.; Ishino, H.; Itoh, R.; Iwasaki, M.; Iwasaki, M.; Kah, D. H.; Kaji, Hiroshi; Kang, J. H.; Kawasaki, T.; Kichimi, H.; Kim, H. J.; Kim, Y. I.; Kim, Y. J.; Kinoshita, K.; Korpar, S.; Križan, P.; Krokovny, P.; Kumar, Ramanuj; Kuzmin, A.; Kwon, Y.; Kyeong, S. H.; Lange, J. S.; Lee, J. S.; Lee, M. J.; Lin, S. W.; Liu, C.; Liu, Y.; Liventsev, D.; Mandl, F.; McOnie, S.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Nakano, E.; Nakao, M.; Nakazawa, H.; Nishida, S.; Nitoh, O.; Ogawa, S.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Ozaki, H.; Pakhlov, P.; Pakhlova, G.; Pałka, H.; Park, C. W.; Park, H.; Peak, L. S.; Pestotnik, R.; Piilonen, L. E.; Poluektov, A.; Sahoo, H.; Sakai, Y.; Schneider, O.; Schwartz, A. J.; Senyo, K.; Shiu, J. G.; Shwartz, B.; Singh, J. B.; Sokolov, A.; Somov, A.; Stanič, S.; Starič, M.; Sumiyoshi, T.; Tanaka, M.; Taylor, G. N.; Teramoto, Y.; Tikhomirov, I.; Trabelsi, K.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Varner, G.; Varvell, K. E.; Vervink, K.; Wang, C. H.; Wang, M. Z.; Wang, P.; Wang, X. L.; Watanabe, Y.; Wicht, J.; Won, E.; Yabsley, B.; Yamashita, Y.; Zhang, C. C.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Živko, T.; Zupanc, A.; Zyukova, O.

doi:10.1103/physrevd.78.072004

Cited by 230 publications

(105 citation statements)

References 13 publications

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“…The χ c1,2 results and their comparison with previous BABAR and Belle measurements are summarized in [60]. This analysis also provides a substantial statistical improvement over previous PDG χ c1 K * world average results.…”

Section: Discussionsupporting

confidence: 53%

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A Study of B→c$\bar{c}$γK in the BaBar Experiment

Fulsom

2009

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The BABAR Collaboration is a high energy physics experiment located at the Stanford Linear Accelerator Center. The primary goal of the experiment is to study charge and parity violation in the B-meson sector, however the copious production of B mesons decaying to other final states allows for a wide-ranging physics program. In particular, one can access the charmonium system via colour-suppressed b → c decays of the type B → ccK.This thesis presents a study of B → ccγK decays where cc includes J/ψ and ψ(2S), and K includes K ± , K 0 S and K * (892). The particular emphasis is on a search for the radiative decays X(3872) → J/ψ γ and X(3872) → ψ(2S)γ. The X(3872) state is a recently-discovered resonance of undetermined quark composition, speculatively a conventional charmonium state or exotic four-quark di-meson molecule. This research is also sensitive to the well-known radiative charmonium decays B → χ c1,2 K, which are used as verification for the analysis technique.This dissertation sets the best B → χ c1 K branching fraction measurements to date, and sees the first evidence for factorization-suppressed B 0 → χ c2 K * 0 decay at a level of 3.6σ. It also provides evidence for X(3872) → J/ψγ and X(3872) → ψ(2S)γ with 3.6σ and 3.3σ significance, respectively.The product of branching fractions B(B ± → X(3872)K ± ) · B(X(3872) → J/ψγ) = (2.8 ± 0.8(stat.) ± 0.2(syst.)) × 10 −6 and B(B ± → X(3872)K ± ) · B(X(3872) → ψ(2S)γ) = (9.5 ± 2.7(stat.) ± 0.9(syst.)) × 10 −6 are measured.These results improve upon previous X(3872) → J/ψ γ measurements, and represent the first evidence for X(3872) → ψ(2S)γ.

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Section: Discussionsupporting

confidence: 53%

“…Belle also claims evidence for two additional features in the decay of B → χ c1 πK that could be identified as charged tetraquarks decaying via Z + → χ c1 π + [60]. These results need further confirmation.…”

Section: Charged Multiquark Statesmentioning

confidence: 91%

A Study of B→c$\bar{c}$γK in the BaBar Experiment

Fulsom

2009

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“…Z + (4051) and Z + (4248). The two charged charmonium-like states, Z + (4051) and Z + (4248), were first observed by the Belle Collaboration in 2008 [109], one year after they reported the observation of the Z + (4430) [103]. They studied the π + χ c1 invariant mass distribution in the exclusiveB 0 → K − π + χ c1 decay, as shown in Fig. 14.…”

Section: +30mentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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“…The discovery of the X(3872) has led to a resurgence of interest in exotic spectroscopy and subsequently many new states have been claimed. [547][548][549], and not confirmed by BaBar [550,551]. The nature of these states has drawn much theoretical attention and many models have been proposed.…”

Section: Exotic Meson Spectroscopymentioning

confidence: 99%

Implications of LHCb measurements and future prospects

Bharucha¹,

Bigi²,

Bobeth³

et al. 2013

Eur. Phys. J. C

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170

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region at a hadron collider. This document discusses the implications of these first measurements on classes of extensions to the Standard Model, bearing in mind the interplay with the results of searches for on-shell production of new particles at ATLAS and CMS. The physics potential of an upgrade to the LHCb detector, which would allow an order of magnitude more data to be collected, is emphasised.

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Observation of two resonancelike structures in theπ+χc1mass distribution in exclusiveB¯0

Cited by 230 publications

References 13 publications

A Study of B→c$\bar{c}$γK in the BaBar Experiment

A Study of B→c$\bar{c}$γK in the BaBar Experiment

The hidden-charm pentaquark and tetraquark states

Implications of LHCb measurements and future prospects

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