Evidence for Exotic Hadron Contributions to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msubsup><mml:mi mathvariant="normal">Λ</mml:mi><mml:mi>b</mml:mi><mml:mn>0</mml:mn></mml:msubsup><mml:mo stretchy="false">→</mml:mo><mml:mi>J</mml:mi><mml:mo stretchy="false">/</mml:mo><mml:mi>ψ</mml:mi><mml:mi>p</mml:mi><mml:msup><mml:mi>π</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Decays

Aaij, R.; Beteta, C. Abellán; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Cartelle, P. Alvarez; Alves, A. A.; Amato, S.; Amerio, S.; Amhis, Y.; An, L.; Anderlini, L.; Andreassi, G.; Andreotti, M.; Andrews, J. E.; Appleby, R. B.; Gutierrez, O. Aquines; Archilli, F.; d’Argent, P.; Romeu, J. Arnau; Артамонов, А.; Artuso, M.; Aslanides, E.; Auriemma, G.; Baalouch, M.; Bachmann, S.; Back, J. J.; Badalov, A.; Baesso, C.; Baldini, W.; Barlow, R. J.; Barschel, C.; Barsuk, S.; Barter, W.; Batozskaya, V.; Battista, V.; Bay, A.; Beaucourt, L.; Beddow, J.; Bedeschi, F.; Bediaga, I.; Bel, L. J.; Bellée, V.; Belloli, N.; Belous, K.; Belyaev, I.; Ben-Haim, E.; Bencivenni, G.; Benson, S.; Benton, J.; Berezhnoy, A.; Bernet, R.; Bertolin, A.; Bettler, M. 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doi:10.1103/physrevlett.117.082003

Cited by 139 publications

(52 citation statements)

References 25 publications

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“…This ratio should also hold for the resonating part of the amplitudes, namely if one replaces the J/ψp by P c (4450) + , and likewise for the J P = 3/2 − P + c state. This is hinted by the current LHCb measurements [387].…”

Section: Weak Decays With P In Decuplet Representationmentioning

confidence: 72%

Exotics: Heavy pentaquarks and tetraquarks

Ali¹,

Lange

Stone

2017

Progress in Particle and Nuclear Physics

567

402

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For many decades after the invention of the quark model in 1964 there was no evidence that hadrons are formed from anything other than the simplest pairings of quarks and antiquarks, mesons being formed of a quark-antiquark pair and baryons from three quarks. In the last decade, however, in an explosion of data from both e + e − and hadron colliders, there are many recently observed states that do not fit into this picture. These new particles are called generically "exotics". They can be either mesons or baryons. Remarkably, they all decay into at least one meson formed of either a cc or bb pair. In this review, after the introduction, we explore each of these new discoveries in detail first from an experimental point of view, then subsequently give a theoretical discussion. These exotics can be explained if the new mesons contain two-quarks and twoantiquarks (tetraquarks), while the baryons contain four-quarks plus an antiquark (pentaquarks). The theoretical explanations for these states take three divergent tracks: tightly bound objects, just as in the case of normal hadrons, but with more constituents, or loosely bound "molecules" similar to the deuteron, but formed from two mesons, or a meson or baryon, or more wistfully, they are not multiquark states but appear due to kinematic effects caused by different rescatterings of virtual particles; most of these models have all been post-dictions. Both the tightly and loosely bound models predict the masses and related quantum numbers of new, as yet undiscovered states. Thus, future experimental discoveries are needed along with theoretical advances to elucidate the structure of these new exotic states.

show abstract

Section: Weak Decays With P In Decuplet Representationmentioning

confidence: 72%

Exotics: Heavy pentaquarks and tetraquarks

Ali¹,

Lange

Stone

2017

Progress in Particle and Nuclear Physics

567

402

View full text Add to dashboard Cite

show abstract

“…Many exotic hadrons have been discovered in the past decade due to significant experimental progresses [1], such as the two hidden-charm pentaquark resonances P c (4380) and P c (4450) discovered by the LHCb Collaboration [2][3][4][5]. Besides them, more exotic hadrons are likely to be observed in the future BaBar, Belle, BESIII, CMS and LHCb experiments, etc.…”

Section: Introductionmentioning

confidence: 99%

Revisiting hidden-charm pentaquarks from QCD sum rules

Xiang

Chen

et al. 2019

Chinese Phys. C

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We revisit the hidden-charm pentaquark states Pc(4380) and Pc(4450) using the method of QCD sum rules by requiring the pole contribution to be larger than or around 30% to better insure the one-pole parametrization to be valid. We find two mixing currents and our results suggest that the Pc(4380) and Pc(4450) can be identified as hidden-charm pentaquark states having J P = 3/2 − and 5/2 + , respectively, while there still exist other possible spin-parity assignments, such as J P = 3/2 + and J P = 5/2 − , which needs to be clarified in further theoretical and experimental studies.All the local hidden-charm pentaquark interpolating currents have been systematically constructed in Refs. [57,58], and some of them were selected to perform QCD sum rule analyses. The results suggest that the P c (4380) and P c (4450) can be interpreted as hidden-charm pentaquark states composed of anticharmed mesons and charmed baryons. However, the analyses therein use one criterion which is not optimized, that is to require the pole contribution to be larger than 10% to insure the one-pole parametrization to be valid. This value is not so significant, and accordingly, the question arises whether we can find a larger pole contribution to better insure the one-pole parametrization?In the present study we try to answer this question in order to find better (more reliable) QCD sum rule results. Especially, we find the following two mixing currents: * ] channels, etc.

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“…By analyzing the J/ψp invariant mass spectrum in the Λ 0 b decay with updated data, a new pentaquark P c (4312) was discovered with 7.3σ significance. Meanwhile, the analysis shows two narrow subpeaks with 5.4 significance, P c (4440) and P c (4457), for the previously reported P c (4450) [29,30]. It is generally recognized that these three new states can be identified clearly as loosely bound Σ cD molecule with I(J P ) = 1/2(1/2 − ), Σ cD * with I(J P ) = 1/2(1/2 − ), and Σ cD * with I(J P ) = 1/2(3/2 − ), respectively, within the framework of one-boson-exchange (OBE) model [31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 59%

Exotic pentaquark states with the qqQQQ¯ configuration

Zhou

Liu

et al. 2019

Phys. Rev. D

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In the framework of the color-magnetic interaction model, we have systematically calculated the mass splittings for the S-wave triply heavy pentaquark states with the configuration qqQQQ (Q = c, b; q = u, d, s). Their masses are estimated and their stabilities are discussed according to possible rearrangement decay patterns. Our results indicate that there may exist several stable or narrow such states. We hope the present study can help experimentalists to search for exotic pentaquarks. 16 3 Cnn Cnn = 30.0 K −16Cns K * 16 3 Ccs Cns = 18.7

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Evidence for Exotic Hadron Contributions toΛb0→J/ψpπ−Decays

Cited by 139 publications

References 25 publications

Exotics: Heavy pentaquarks and tetraquarks

Exotics: Heavy pentaquarks and tetraquarks

Revisiting hidden-charm pentaquarks from QCD sum rules

Exotic pentaquark states with the qqQQQ¯ configuration

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