23 results on '"pentaquarks"'
Search Results
2. Research in Theoretical Nuclear Physics
- Author
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Robson, Don
- Published
- 2005
- Full Text
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3. The pentaquark candidates in the dynamical diquark picture
- Author
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Richard F. Lebed
- Subjects
Exotic baryons ,Pentaquarks ,Diquarks ,Physics ,QC1-999 - Abstract
Starting with the dynamical picture of the exotic cc¯-containing states XYZ as the confinement-induced hadronization of a rapidly separating pair of a compact diquark and antidiquark, we describe the pentaquark candidates Pc+(4380) and Pc+(4450) in terms of a confined but rapidly separating color-antitriplet diquark cu and color-triplet “triquark” c¯(ud). This separation explains the relatively small Pc+ widths, despite these 5-quark systems lying far above both the J/ψp and ΛcD¯(⁎)0 thresholds. The Pc+ states are predicted to form isospin doublets with neutral partners Pc0.
- Published
- 2015
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4. The baryo-quarkonium picture for hidden-charm and bottom pentaquarks and LHCb Pc(4380) and Pc(4450) states.
- Author
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Ferretti, J., Santopinto, E., Naeem Anwar, M., and Bedolla, M.A.
- Subjects
- *
QUARKONIUMS , *QUARKS , *LARGE Hadron Collider , *PARTICLES (Nuclear physics) , *QUANTUM chromodynamics - Abstract
Abstract We study baryo-charmonium [ η c - and J / ψ - N ⁎ , η c (2 S) -, ψ (2 S) - and χ c (1 P) - N ] and baryo-bottomonium [ η b (2 S) -, ϒ (2 S) - and χ b (1 P) - N ] bound states, where N is the nucleon and N ⁎ a nucleon resonance. In the baryo-quarkonium model, the five q q q Q Q ¯ quarks are arranged in terms of a heavy quarkonium core, Q Q ¯ , embedded in light baryonic matter, qqq , with q = u or d. The interaction between the Q Q ¯ core and the light baryon can be written in terms of the QCD multipole expansion. The spectrum of baryo-charmonium states is calculated and the results compared with the existing experimental data. In particular, we can interpret the recently discovered P c (4380) and P c (4450) pentaquarks as ψ (2 S) - N and χ c2 (1 P) - N bound states, respectively. We observe that in the baryo-bottomonium sector the binding energies are, on average, slightly larger than those of baryo-charmonia. Because of this, the hidden-bottom pentaquarks are more likely to form than their hidden-charm counterparts. We thus suggest the experimentalists to look for five-quark states in the hidden-bottom sector in the 10.4 – 10.9 GeV energy region. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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5. Spectrum of the Y=2 pentaquarks
- Author
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Buccella Franco, Falcone Domenico, and Tramontano Francesco
- Subjects
pentaquarks ,chromo-magnetic interaction ,12.39.ki ,12.40.yx ,Physics ,QC1-999 - Published
- 2005
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6. Properties of the P-c(4312) pentaquark and its bottom partner
- Author
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Kazem Azizi, Hayriye Sundu, Yasemin Saraç, and 0-Belirlenecek
- Subjects
Nuclear and High Energy Physics ,Particle physics ,pentaquarks ,FOS: Physical sciences ,01 natural sciences ,High Energy Physics - Experiment ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Lattice ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,Charm (quantum number) ,010306 general physics ,Instrumentation ,Spin-½ ,Physics ,QCD sum rules ,010308 nuclear & particles physics ,P-c(4312) sate ,High Energy Physics - Lattice (hep-lat) ,Sigma ,Astronomy and Astrophysics ,Parity (physics) ,State (functional analysis) ,Quantum number ,Pentaquark ,High Energy Physics - Phenomenology ,High Energy Physics::Experiment - Abstract
We present an analysis of the newly observed pentaquark $P_c(4312)^+$ to shed light on its quantum numbers. To do that, the QCD sum rule approach is used. The measured mass of this particle is close to $\Sigma_c^{++}\bar{D}^-$ threshold and has a small width, which supports the possibility of its being a molecular state. We consider an interpolating current in a molecular form and analyze both the positive and negative parity states with spin-$\frac{1}{2}$. We also consider the bottom counterpart of the state with similar molecular form. Our mass result for the charm pentaquark state supports that, the quantum numbers of the observed state are consistent with $J^P=\frac{1}{2}^{-}$., Comment: 9 Pages and3 Tables. To be published in Chinese Physics C
- Published
- 2021
7. Fully-heavy tetraquarks and other heavy multiquarks
- Author
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Jean-Marc Richard, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Physics ,Quark ,hexaquarks ,heavy quarks ,Nuclear and High Energy Physics ,Particle physics ,tetraquarks ,multiquarks ,010308 nuclear & particles physics ,pentaquarks ,FOS: Physical sciences ,tetraquark ,01 natural sciences ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,multiquark ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,0103 physical sciences ,heavy quark ,010306 general physics ,charm ,pentaquark - Abstract
A review is presented of some discussions about the fully-heavy tetraquarks made of two charmed quarks and two anticharmed antiquarks, and other multiquark states involving some heavy flavors., Comment: Contribution to the 23rd Int. Conf.in Quantum Chromodynamics (QCD 20, 35 years later), 29 June - 3 July 2015, Montpellier, France
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- 2021
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8. Exploring Possible Triangle Singularities in the Ξ b − → K − J / ψ Λ Decay
- Author
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Shen, Chao-Wei, Jing, Hao-Jie, Guo, Feng-Kun, and Wu, Jia-Jun
- Subjects
triangle singularity ,pentaquarks ,High Energy Physics::Experiment ,exotic hadrons - Abstract
We analyze possible singularities in the J/&psi, &Lambda, invariant mass distribution of the &Xi, b&minus, &rarr, K&minus, J/&psi, process via triangle loop diagrams. Triangle singularities in the physical region are found in 18 different triangle loop diagrams. Among those with &Xi, *-charmonium-&Lambda, intermediate states, the one from the &chi, c1&Xi, (2120)&Lambda, loop, which is located around 4628 MeV, is found the most likely to cause observable effects. One needs S- and P-waves in &chi, c1&Lambda, and J/&psi, systems, respectively, when the quantum numbers of these systems are 1/2+ or 3/2+. When the quantum numbers of the &Xi, (2120) are JP=1/2+, 1/2&minus, or 3/2+, the peak structure should be sharper than the other JP choices. This suggests that although the whole strength is unknown, we should pay attention to the contributions from the &Xi, triangle diagram if structures are observed in the J/&psi, invariant mass spectrum experimentally. In addition, a few triangle diagrams with the Ds1*(2700) as one of the intermediate particles can also produce singularities in the J/&psi, distribution, but at higher energies above 4.9 GeV.
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- 2020
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9. Double Polarization Observables in Pentaquark Photoproduction
- Author
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A. Pilloni, D. Winney, Vincent Mathieu, Victor Mokeev, Adam P. Szczepaniak, Miguel Albaladejo, César Fernández-Ramírez, C. Fanelli, and A. N. Hiller Blin
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Particle physics ,Física-Modelos matemáticos ,Photon ,Hadron ,pentaquarks ,FOS: Physical sciences ,01 natural sciences ,exotic hadrons ,High Energy Physics - Experiment ,Polarized target ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,Photon polarization ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Nuclear Experiment ,Physics ,hadron spectroscopy ,010308 nuclear & particles physics ,Observable ,Polarization (waves) ,Helicity ,Pentaquark ,High Energy Physics - Phenomenology ,High Energy Physics::Experiment - Abstract
We investigate the properties of the hidden charm pentaquark-like resonances first observed by LHCb in 2015, by measuring the polarization transfer KLL between the incident photon and the outgoing proton in the exclusive photoproduction of J/psi near threshold. We present a first estimate of the sensitivity of this observable to the pentaquark photocouplings and hadronic branching ratios, and extend our predictions to the case of initial state helicity correlation ALL, using a polarized target. These results serve as a benchmark for the SBS experiment at Jefferson Lab, which proposes to measure for the first time the helicity correlations ALL and KLL in J/psi exclusive photoproduction, in order to determine the pentaquark photocouplings and branching ratios., Comment: 9 pages, 7 figures, 2 tables, Version published in PRD
- Published
- 2019
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10. Cluster reducibility of multiquark operators
- Author
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Hagop Sazdjian, Dmitri Melikhov, Wolfgang Lucha, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
- Subjects
Property (philosophy) ,Hadron ,pentaquarks ,multiquark operators ,FOS: Physical sciences ,01 natural sciences ,Theoretical physics ,High Energy Physics - Phenomenology (hep-ph) ,Operator (computer programming) ,multiquark ,14.40.Rt ,0103 physical sciences ,Bound state ,Cluster (physics) ,invariance: gauge ,Strong Interactions ,010306 general physics ,cluster ,Physics ,hexaquarks ,tetraquarks ,010308 nuclear & particles physics ,High Energy Physics::Phenomenology ,formation ,12.39.Mk ,12.38.Lg ,High Energy Physics - Phenomenology ,bound state ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,13.25.Jx ,Configuration space ,11.15.Pg - Abstract
It is shown that the multiquark gauge-invariant operators can, in general, be decomposed into combinations of products of ordinary hadronic operators, exhibiting their cluster reducibility. The latter property inhibits the formation of completely compact multiquark bound states. Multiquark operators still play a crucial role in the description of exotic states in regions of configuration space where the hadronic clusters are close to each other. Our proof gives a foundation for a unified viewpoint, where the multiquark-type and the molecular-type approaches play complementary roles, at the gauge-invariant nonlocal operator level., 16 pages, 12 figures. A sentence has been changed in the abstract. A few minor changes in the main text
- Published
- 2019
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11. Observation of a Narrow Pentaquark State, Pc (4312)+, and of the Two-Peak Structure of the Pc (4450)+
- Author
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Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Alkhazov, G, Cartelle, P Alvarez, Jr, Alves AA, Amato, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Archilli, F, d'Argent, P, Romeu, J Arnau, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Batozskaya, V, Batsukh, B, Battig, A, Battista, V, Bay, A, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belavin, V, Belin, S, Beliy, N, Bellee, V, Belloli, N, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, van Beuzekom, M, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bieker, MS, Bifani, S, Billoir, P, Birnkraut, A, Bizzeti, A, Bjorn, M, Blago, MP, Blake, T, Blanc, F, Blusk, S, Bobulska, D, Bocci, V, Boente Garcia, O, Boettcher, T, Bondar, A, Bondar, N, Borghi, S, Borisyak, M, Borsato, M, Boubdir, M, Bowcock, TJV, Bozzi, C, Braun, S, Brea Rodriguez, A, Brodski, M, Brodzicka, J, Gonzalo, A Brossa, Brundu, D, Buchanan, E, Buonaura, A, Burr, C, Bursche, A, Butter, JS, Buytaert, J, Byczynski, W, Cadeddu, S, Cai, H, Calabrese, R, Cali, S, Calladine, R, Calvi, M, Calvo Gomez, M, Camboni, A, Campana, P, Perez, DH Campora, Capriotti, L, Carbone, A, Carboni, G, Cardinale, R, Cardini, A, Carniti, P, Carvalho Akiba, K, Casais Vidal, A, Casse, G, Cattaneo, M, Cavallero, G, Cenci, R, Chapman, MG, Charles, M, Charpentier, Ph, Chatzikonstantinidis, G, Chefdeville, M, Chekalina, V, Chen, C, Chen, S, Chitic, S-G, Chobanova, V, Chrzaszcz, M, Chubykin, A, Ciambrone, P, Cid Vidal, X, Ciezarek, G, Cindolo, F, Clarke, PEL, Clemencic, M, Cliff, HV, Closier, J, Coco, V, Coelho, JAB, Cogan, J, Cogneras, E, Cojocariu, L, Collins, P, Colombo, T, Comerma-Montells, A, Contu, A, Coombs, G, Coquereau, S, Corti, G, Sobral, CM Costa, Couturier, B, Cowan, GA, Craik, DC, Crocombe, A, Cruz Torres, M, Currie, R, D'Ambrosio, C, Da Silva, CL, Dall'Occo, E, Dalseno, J, Danilina, A, Davis, A, Francisco, O De Aguiar, De Bruyn, K, De Capua, S, De Cian, M, De Miranda, JM, De Paula, L, De Serio, M, De Simone, P, Dean, CT, Dean, W, Decamp, D, Del Buono, L, Delaney, B, Dembinski, H-P, Demmer, M, Dendek, A, Derkach, D, Deschamps, O, Desse, F, Dettori, F, Dey, B, Di Canto, A, Di Nezza, P, Didenko, S, Dijkstra, H, Dordei, F, Dorigo, M, Dosil Suarez, A, Douglas, L, Dovbnya, A, Dreimanis, K, Dufour, L, Dujany, G, Durante, P, Durham, JM, Dutta, D, Dzhelyadin, R, Dziewiecki, M, Dziurda, A, Dzyuba, A, Easo, S, Egede, U, Egorychev, V, Eidelman, S, Eisenhardt, S, Eitschberger, U, Ek-In, S, Ekelhof, R, Eklund, L, Ely, S, Ene, A, Escher, S, Esen, S, Evans, T, Falabella, A, Farley, N, Farry, S, Fazzini, D, Declara, P Fernandez, Fernandez Prieto, A, Fernandez-Ramirez, C, Ferrari, F, Lopes, L Ferreira, Ferreira Rodrigues, F, Sole, S Ferreres, Ferro-Luzzi, M, Filippov, S, Fini, RA, Fiorini, M, Firlej, M, Fitzpatrick, C, Fiutowski, T, Fleuret, F, Fontana, M, Fontanelli, F, Forty, R, Lima, V Franco, Sevilla, M Franco, Frank, M, Frei, C, Fu, J, Funk, W, Farber, C, Feo, M, Gabriel, E, Gallas Torreira, A, Galli, D, Gallorini, S, Gambetta, S, Gan, Y, Gandelman, M, Gandini, P, Gao, Y, Garcia Martin, LM, Garcia Plana, B, Pardinas, J Garcia, Tico, J Garra, Garrido, L, Gascon, D, Gaspar, C, Gazzoni, G, Gerick, D, Gersabeck, E, Gersabeck, M, Gershon, T, Gerstel, D, Ghez, Ph, Gibson, V, Girard, OG, Gironella Gironell, P, Giubega, L, Gizdov, K, Gligorov, VV, Golubkov, D, Golutvin, A, Gomes, A, Gorelov, IV, Gotti, C, Govorkova, E, Grabowski, JP, Graciani Diaz, R, Cardoso, LA Granado, Grauges, E, Graverini, E, Graziani, G, Grecu, A, Greim, R, Griffith, P, Grillo, L, Gruber, L, Cazon, BR Gruberg, Gu, C, Guo, X, Gushchin, E, Guth, A, Guz, Yu, Gys, T, Gobel, C, Hadavizadeh, T, Hadjivasiliou, C, Haefeli, G, Haen, C, Haines, SC, Hamilton, B, Han, Q, Han, X, Hancock, TH, Hansmann-Menzemer, S, Harnew, N, Harrison, T, Hasse, C, Hatch, M, He, J, Hecker, M, Heinicke, K, Heister, A, Hennessy, K, Henry, L, van Herwijnen, E, Heuel, J, Hess, M, Hicheur, A, Charman, R Hidalgo, Hill, D, Hilton, M, Hopchev, PH, Hu, J, Hu, W, Huang, W, Huard, ZC, Hulsbergen, W, Humair, T, Hushchyn, M, Hutchcroft, D, Hynds, D, Ibis, P, Idzik, M, Ilten, P, Inglessi, A, Inyakin, A, Ivshin, K, Jacobsson, R, Jakobsen, S, Jalocha, J, Jans, E, Jashal, BK, Jawahery, A, Jiang, F, John, M, Johnson, D, Jones, CR, Joram, C, Jost, B, Jurik, N, Kandybei, S, Karacson, M, Kariuki, JM, Karodia, S, Kazeev, N, Kecke, M, Keizer, F, Kelsey, M, Kenzie, M, Ketel, T, Khanji, B, Kharisova, A, Khurewathanakul, C, Kim, KE, Kirn, T, Kirsebom, VS, Klaver, S, Klimaszewski, K, Koliiev, S, Kolpin, M, Kondybayeva, A, Konoplyannikov, A, Kopecna, R, Koppenburg, P, Kostiuk, I, Kot, O, Kotriakhova, S, Kozeiha, M, Kravchuk, L, Kreps, M, Kress, F, Kretzschmar, S, Krokovny, P, Krupa, W, Krzemien, W, Kucewicz, W, Kucharczyk, M, Kudryavtsev, V, Kunde, GJ, Kuonen, AK, Kvaratskheliya, T, Lacarrere, D, Lafferty, G, Lai, A, Lancierini, D, Lanfranchi, G, Langenbruch, C, Latham, T, Lazzeroni, C, Le Gac, R, Leflat, A, Lefevre, R, Lemaitre, F, Leroy, O, Lesiak, T, Leverington, B, Li, H, Li, P-R, Li, X, Li, Y, Li, Z, Liang, X, Likhomanenko, T, Lindner, R, Ling, P, Lionetto, F, Lisovskyi, V, Liu, G, Liu, X, Loh, D, Loi, A, Lomba Castro, J, Longstaff, I, Lopes, JH, Loustau, G, Lovell, GH, Lucchesi, D, Lucio Martinez, M, Luo, Y, Lupato, A, Luppi, E, Lupton, O, Lusiani, A, Lyu, X, Ma, R, Machefert, F, Maciuc, F, Macko, V, Mackowiak, P, Maddrell-Mander, S, Maev, O, Maguire, K, Maisuzenko, D, Majewski, MW, Malde, S, Malecki, B, Malinin, A, Maltsev, T, Malygina, H, Manca, G, Mancinelli, G, Marangotto, D, Maratas, J, Marchand, JF, Marconi, U, Benito, C Marin, Marinangeli, M, Marino, P, Marks, J, Marshall, PJ, Martellotti, G, Martinazzoli, L, Martinelli, M, Martinez Santos, D, Martinez Vidal, F, Massafferri, A, Materok, M, Matev, R, Mathad, A, Mathe, Z, Matiunin, V, Matteuzzi, C, Mattioli, KR, Mauri, A, Maurice, E, Maurin, B, McCann, M, Mcnab, A, McNulty, R, Mead, JV, Meadows, B, Meaux, C, Meinert, N, Melnychuk, D, Merk, M, Merli, A, Michielin, E, Mikhasenko, M, Milanes, DA, Millard, E, Minard, M-N, Minzoni, L, Mitzel, DS, Mogini, A, Moise, RD, Mombacher, T, Monroy, IA, Monteil, S, Morandin, M, Morello, G, Morello, MJ, Moron, J, Morris, AB, Mountain, R, Mu, H, Muheim, F, Mukherjee, M, Mulder, M, Murphy, CH, Murray, D, Modden, A, Muller, D, Muller, J, Muller, K, Muller, V, Naik, P, Nakada, T, Nandakumar, R, Nandi, A, Nanut, T, Nasteva, I, Needham, M, Neri, N, Neubert, S, Neufeld, N, Newcombe, R, Nguyen, TD, Nguyen-Mau, C, Nieswand, S, Niet, R, Nikitin, N, Nolte, NS, O'Hanlon, DP, Oblakowska-Mucha, A, Obraztsov, V, Ogilvy, S, Oldeman, R, Onderwater, CJG, Osborn, JD, Ossowska, A, Otalora Goicochea, JM, Ovsiannikova, T, Owen, P, Oyanguren, A, Pais, PR, Pajero, T, Palano, A, Palutan, M, Panshin, G, Papanestis, A, Pappagallo, M, Pappalardo, LL, Parker, W, Parkes, C, Passaleva, G, Pastore, A, Patel, M, Patrignani, C, Pearce, A, Pellegrino, A, Penso, G, Altarelli, M Pepe, Perazzini, S, Pereima, D, Perret, P, Pescatore, L, Petridis, K, Petrolini, A, Petrov, A, Petrucci, S, Petruzzo, M, Pietrzyk, B, Pietrzyk, G, Pikies, M, Pili, M, Pilloni, A, Pinci, D, Pinzino, J, Pisani, F, Piucci, A, Placinta, V, Playfer, S, Plews, J, Plo Casasus, M, Polci, F, Lener, M Poli, Poliakova, M, Poluektov, A, Polukhina, N, Polyakov, I, Polycarpo, E, Pomery, GJ, Ponce, S, Popov, A, Popov, D, Poslavskii, S, Price, E, Prouve, C, Pugatch, V, Navarro, A Puig, Pullen, H, Punzi, G, Qian, W, Qin, J, Quagliani, R, Quintana, B, Raab, NV, Rachwal, B, Rademacker, JH, Rama, M, Ramos Pernas, M, Rangel, MS, Ratnikov, F, Raven, G, Salzgeber, M Ravonel, Reboud, M, Redi, F, Reichert, S, dos Reis, AC, Reiss, F, Remon Alepuz, C, Ren, Z, Renaudin, V, Ricciardi, S, Richards, S, Rinnert, K, Robbe, P, Robert, A, Rodrigues, AB, Rodrigues, E, Lopez, JA Rodriguez, Roehrken, M, Roiser, S, Rollings, A, Romanovskiy, V, Romero Vidal, A, Roth, JD, Rotondo, M, Rudolph, MS, Ruf, T, Ruiz Vidal, J, Saborido Silva, JJ, Sagidova, N, Saitta, B, Salustino Guimaraes, V, Gras, C Sanchez, Sanchez Mayordomo, C, Sanmartin Sedes, B, Santacesaria, R, Santamarina Rios, C, Santimaria, M, Santovetti, E, Sarpis, G, Sarti, A, Satriano, C, Satta, A, Saur, M, Savrina, D, Schael, S, Schellenberg, M, Schiller, M, Schindler, H, Schmelling, M, Schmelzer, T, Schmidt, B, Schneider, O, Schopper, A, Schreiner, HF, Schubiger, M, Schulte, S, Schune, MH, Schwemmer, R, Sciascia, B, Sciubba, A, Semennikov, A, Sepulveda, ES, Sergi, A, Serra, N, Serrano, J, Sestini, L, Seuthe, A, Seyfert, P, Shapkin, M, Shears, T, Shekhtman, L, Shevchenko, V, Shmanin, E, Siddi, BG, Coutinho, R Silva, Silva de Oliveira, L, Simi, G, Simone, 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S., Klaver, S., Klimaszewski, K., Koliiev, S., Kolpin, M., Kondybayeva, A., Konoplyannikov, A., Kopecna, R., Koppenburg, P., Kostiuk, I., Kot, O., Kotriakhova, S., Kozeiha, M., Kravchuk, L., Kreps, M., Kress, F., Kretzschmar, S., Krokovny, P., Krupa, W., Krzemien, W., Kucewicz, W., Kucharczyk, M., Kudryavtsev, V., Kunde, G. J., Kuonen, A. K., Kvaratskheliya, T., Lacarrere, D., Lafferty, G., Lai, A., Lancierini, D., Lanfranchi, G., Langenbruch, C., Latham, T., Lazzeroni, C., Le Gac, R., Leflat, A., Lefevre, R., Lemaitre, F., Leroy, O., Lesiak, T., Leverington, B., Li, H., Li, P. -R., Li, X., Li, Y., Li, Z., Liang, X., Likhomanenko, T., Lindner, R., Ling, P., Lionetto, F., Lisovskyi, V., Liu, G., Liu, X., Loh, D., Loi, A., Lomba Castro, J., Longstaff, I., Lopes, J. H., Loustau, G., Lovell, G. H., Lucchesi, D., Lucio Martinez, M., Luo, Y., Lupato, A., Luppi, E., Lupton, O., Lusiani, A., Lyu, X., Ma, R., Machefert, F., Maciuc, F., Macko, V., Mackowiak, P., Maddrell-Mander, S., Maev, O., Maguire, K., Maisuzenko, D., Majewski, M. W., Malde, S., Malecki, B., Malinin, A., Maltsev, T., Malygina, H., Manca, G., Mancinelli, G., Marangotto, D., Maratas, J., Marchand, J. F., Marconi, U., Benito, C. Marin, Marinangeli, M., Marino, P., Marks, J., Marshall, P. J., Martellotti, G., Martinazzoli, L., Martinelli, M., Martinez Santos, D., Martinez Vidal, F., Massafferri, A., Materok, M., Matev, R., Mathad, A., Mathe, Z., Matiunin, V., Matteuzzi, C., Mattioli, K. R., Mauri, A., Maurice, E., Maurin, B., Mccann, M., Mcnab, A., Mcnulty, R., Mead, J. V., Meadows, B., Meaux, C., Meinert, N., Melnychuk, D., Merk, M., Merli, A., Michielin, E., Mikhasenko, M., Milanes, D. A., Millard, E., Minard, M. -N., Minzoni, L., Mitzel, D. S., Mogini, A., Moise, R. D., Mombacher, T., Monroy, I. A., Monteil, S., Morandin, M., Morello, G., Morello, M. J., Moron, J., Morris, A. B., Mountain, R., Mu, H., Muheim, F., Mukherjee, M., Mulder, M., Murphy, C. H., Murray, D., Modden, A., Muller, D., Muller, J., Muller, K., Muller, V., Naik, P., Nakada, T., Nandakumar, R., Nandi, A., Nanut, T., Nasteva, I., Needham, M., Neri, N., Neubert, S., Neufeld, N., Newcombe, R., Nguyen, T. D., Nguyen-Mau, C., Nieswand, S., Niet, R., Nikitin, N., Nolte, N. S., O'Hanlon, D. P., Oblakowska-Mucha, A., Obraztsov, V., Ogilvy, S., Oldeman, R., Onderwater, C. J. G., Osborn, J. D., Ossowska, A., Otalora Goicochea, J. M., Ovsiannikova, T., Owen, P., Oyanguren, A., Pais, P. R., Pajero, T., Palano, A., Palutan, M., Panshin, G., Papanestis, A., Pappagallo, M., Pappalardo, L. L., Parker, W., Parkes, C., Passaleva, G., Pastore, A., Patel, M., Patrignani, C., Pearce, A., Pellegrino, A., Penso, G., Altarelli, M. Pepe, Perazzini, S., Pereima, D., Perret, P., Pescatore, L., Petridis, K., Petrolini, A., Petrov, A., Petrucci, S., Petruzzo, M., Pietrzyk, B., Pietrzyk, G., Pikies, M., Pili, M., Pilloni, A., Pinci, D., Pinzino, J., Pisani, F., Piucci, A., Placinta, V., Playfer, S., Plews, J., Plo Casasus, M., Polci, F., Lener, M. Poli, Poliakova, M., Poluektov, A., Polukhina, N., Polyakov, I., Polycarpo, E., Pomery, G. J., Ponce, S., Popov, A., Popov, D., Poslavskii, S., Price, E., Prouve, C., Pugatch, V., Navarro, A. Puig, Pullen, H., Punzi, G., Qian, W., Qin, J., Quagliani, R., Quintana, B., Raab, N. V., Rachwal, B., Rademacker, J. H., Rama, M., Ramos Pernas, M., Rangel, M. S., Ratnikov, F., Raven, G., Salzgeber, M. Ravonel, Reboud, M., Redi, F., Reichert, S., dos Reis, A. C., Reiss, F., Remon Alepuz, C., Ren, Z., Renaudin, V., Ricciardi, S., Richards, S., Rinnert, K., Robbe, P., Robert, A., Rodrigues, A. B., Rodrigues, E., Lopez, J. A. Rodriguez, Roehrken, M., Roiser, S., Rollings, A., Romanovskiy, V., Romero Vidal, A., Roth, J. D., Rotondo, M., Rudolph, M. S., Ruf, T., Ruiz Vidal, J., Saborido Silva, J. J., Sagidova, N., Saitta, B., Salustino Guimaraes, V., Gras, C. Sanchez, Sanchez Mayordomo, C., Sanmartin Sedes, B., Santacesaria, R., Santamarina Rios, C., Santimaria, M., Santovetti, E., Sarpis, G., Sarti, A., Satriano, C., Satta, A., Saur, M., Savrina, D., Schael, S., Schellenberg, M., Schiller, M., Schindler, H., Schmelling, M., Schmelzer, T., Schmidt, B., Schneider, O., Schopper, A., Schreiner, H. F., Schubiger, M., Schulte, S., Schune, M. H., Schwemmer, R., Sciascia, B., Sciubba, A., Semennikov, A., Sepulveda, E. S., Sergi, A., Serra, N., Serrano, J., Sestini, L., Seuthe, A., Seyfert, P., Shapkin, M., Shears, T., Shekhtman, L., Shevchenko, V., Shmanin, E., Siddi, B. G., Coutinho, R. Silva, Silva de Oliveira, L., Simi, G., Simone, S., Skiba, I., Skidmore, N., Skwarnicki, T., Slater, M. W., Smeaton, J. G., Smith, E., Smith, I. T., Smith, M., Soares, M., Soares Lavra, L., Sokoloff, M. D., Soler, F. J. P., Souza De Paula, B., Spaan, B., Norella, E. Spadaro, Spradlin, P., Stagni, F., Stahl, M., Stahl, S., Stefko, P., Stefkova, S., Steinkamp, O., Stemmle, S., Stenyakin, O., Stepanova, M., Stevens, H., Stocchi, A., Stone, S., Stracka, S., Stramaglia, M. E., Straticiuc, M., Straumann, U., Strokov, S., Sun, J., Sun, L., Sun, Y., Swientek, K., Szabelski, A., Szczepaniak, A., Szumlak, T., Szymanski, M., T'Jampens, S., Tang, Z., Tekampe, T., Tellarini, G., Teubert, F., Thomas, E., van Tilburg, J., Tilley, M. J., Tisserand, V., Tobin, M., Tolk, S., Tomassetti, L., Tonelli, D., Tou, D. Y., Tournefier, E., Traill, M., Tran, M. T., Trisovic, A., Tsaregorodtsev, A., Tuci, G., Tully, A., Tuning, N., Ukleja, A., Usachov, A., Ustyuzhanin, A., Uwer, U., Vagner, A., Vagnoni, V., Valassi, A., Valat, S., Valenti, G., Van Hecke, H., Van Hulse, C. B., Vasiliev, A., Gomez, R. Vazquez, Vazquez Regueiro, P., Vecchi, S., van Veghel, M., Velthuis, J. J., Veltri, M., Venkateswaran, A., Vernet, M., Veronesi, M., Vesterinen, M., Barbosa, J. V. Viana, Vieira, D., Vieites Diaz, M., Viemann, H., Vilasis-Cardona, X., Vitkovskiy, A., Vitti, M., Volkov, V., Vollhardt, A., Bruch, D. Vom, Voneki, B., Vorobyev, A., Vorobyev, V., Voropaev, N., de Vries, J. A., Vazquez Sierra, C., Waldi, R., Walsh, J., Wang, J., Wang, M., Wang, Y., Wang, Z., Ward, D. R., Wark, H. M., Watson, N. K., Websdale, D., Weiden, A., Weisser, C., Whitehead, M., Wilkinson, G., Wilkinson, M., Williams, I., Williams, M. R. J., Williams, M., Williams, T., Wilson, F. F., Winn, M., Wislicki, W., Witek, M., Wormser, G., Wotton, S. A., Wyllie, K., Xiao, D., Xie, Y., Xing, H., Xu, A., Xu, L., Xu, M., Xu, Q., Xu, Z., Yang, Z., Yao, Y., Yeomans, E., Yin, H., Yu, J., Yuan, X., Yushchenko, O., Zarebski, K. A., Zavertyaev, M., Zeng, M., Zhang, D., Zhang, L., Zhang, S., Zhang, W. C., Zhang, Y., Zhelezov, A., Zheng, Y., Zhu, X., Zhukov, V., Zonneveld, J. B., Zucchelli, S., European Organization for Nuclear Research, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), Conselho Nacional de Desenvolvimento Científico e Tecnológico (Brasil), Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Financiadora de Estudos e Projetos (Brasil), Ministry of Science and Technology of the People's Republic of China, National Natural Science Foundation of China, Centre National de la Recherche Scientifique (France), Institut National de Physique Nucléaire et de Physique des Particules (France), Federal Ministry of Education and Research (Germany), German Research Foundation, Max Planck Society, Laboratori Nazionali di Legnaro, Netherlands Organization for Scientific Research, Ministry of Science and Higher Education (Poland), National Science Centre (Poland), Institute of Atomic Physics (Romania), Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Swiss National Science Foundation, National Academy of Sciences of Ukraine, Science and Technology Facilities Council (UK), National Science Foundation (US), Alexander von Humboldt Foundation, European Commission, Agence Nationale de la Recherche (France), Chinese Academy of Sciences, Russian Foundation for Basic Research, Russian Science Foundation, Generalitat Valenciana, Xunta de Galicia, Generalitat de Catalunya, Leverhulme Trust, Royal Society (UK), Consejo Nacional de Ciencia y Tecnología (México), Abellán Beteta, C., Aidala, C.A., Alvarez Cartelle, P., Alves Jr, A.A., Andrews, J.E., d'Argent, P., Arnau Romeu, J., Back, J.J., Barlow, R.J., Bel, L.J., Bettler, M.O., Bieker, M.S., Bjørn, M., Blago, M.P., Bowcock, T.J.V., Brossa Gonzalo, A., Butter, J.S., Campora Perez, D.H., Chapman, M.G., Chitic, S.-G., Clarke, P.E.L., Cliff, H.V., Coelho, J.A.B., Costa Sobral, C.M., Cowan, G.A., Craik, D.C., Da Silva, C.L., De Aguiar Francisco, O., De Miranda, J.M., Dean, C.T., Dembinski, H.-P., Dosil Suárez, A., Durham, J.M., Fernandez Declara, P., Fernández-Ramírez, C., Ferreira Lopes, L., Ferreres Sole, S., Fini, R.A., Franco Lima, V., Franco Sevilla, M., Färber, C., Féo, M., Garcia Martin, L.M., García Pardiñas, J., Garra Tico, J., Girard, O.G., Gligorov, V.V., Gorelov, I.V., Grabowski, J.P., Granado Cardoso, L.A., Graugés, E., Gruberg Cazon, B.R., Göbel, C., Haines, S.C., Hancock, T.H., Heß, M., Hidalgo Charman, R., Hopchev, P.H., Huard, Z.C., Jashal, B.K., Jones, C.R., Kariuki, J.M., Kim, K.E., Kirsebom, V.S., Kunde, G.J., Kuonen, A.K., Lefèvre, R., Li, P.-R., Lopes, J.H., Lovell, G.H., Majewski, M.W., Marchand, J.F., Marin Benito, C., Marshall, P.J., Mattioli, K.R., McCann, M., McNab, A., McNulty, R., Mead, J.V., Milanes, D.A., Minard, M.-N., Mitzel, D.S., Moise, R.D., Mombächer, T., Monroy, I.A., Morello, M.J., Morris, A.B., Murphy, C.H., Mödden, A., Müller, D., Müller, J., Müller, K., Müller, V., Nguyen, T.D., Nolte, N.S., O'Hanlon, D.P., Onderwater, C.J.G., Otalora Goicochea, J.M., Pais, P.R., Pappalardo, L.L., Pepe Altarelli, M., Poli Lener, M., Pomery, G.J., Puig Navarro, A., Raab, N.V., Rademacker, J.H., Rangel, M.S., Ravonel Salzgeber, M., dos Reis, A.C., Rodrigues, A.B., Rodriguez Lopez, J.A., Roth, J.D., Rudolph, M.S., Saborido Silva, J.J., Sanchez Gras, C., Schreiner, H.F., Schune, M.H., Sepulveda, E.S., Siddi, B.G., Silva Coutinho, R., Slater, M.W., Smeaton, J.G., Smith, I.T., Soares Lavra, l., Sokoloff, M.D., Soler, F.J.P., Spadaro Norella, E., Stramaglia, M.E., Tilley, M.J., Tou, D.Y., Tran, M.T., Van Hulse, C.B., Vazquez Gomez, R., Velthuis, J.J., Viana Barbosa, J.V., Vom Bruch, D., de Vries, J.A., Vázquez Sierra, C., Ward, D.R., Wark, H.M., Watson, N.K., Williams, M.R.J., Wilson, F.F., Wotton, S.A., Yeomans, L.E., Zarebski, K.A., Zhang, W.C., and Zonneveld, J.B.
- Subjects
Particles and field ,pentaquarks ,Charm quark ,QUARK-MODEL ,DIQUARK ,BARYONS ,exotic hadrons ,quark-model ,NO ,PE2_2 ,PE2_1 ,Quark model ,Physic ,ddc:530 ,Settore FIS/01 ,hadron spectroscopy ,Settore FIS/01 - Fisica Sperimentale ,Pentaquark observation ,HEP ,Exotic baryon ,LHCb ,Hadron collider ,diquark ,High Energy Physics::Experiment ,Quark model, baryons, diquark ,LHC ,baryons - Abstract
A narrow pentaquark state, Pcð4312Þþ, decaying to J=ψp, is discovered with a statistical significance of 7.3σ in a data sample of Λ0 b → J=ψpK− decays, which is an order of magnitude larger than that previously analyzed by the LHCb Collaboration. The Pcð4450Þþ pentaquark structure formerly reported by LHCb is confirmed and observed to consist of two narrow overlapping peaks, Pcð4440Þþ and Pcð4457Þþ, where the statistical significance of this two-peak interpretation is 5.4σ. The proximity of the Σþ c D¯ 0 and Σþ c D¯ 0 thresholds to the observed narrow peaks suggests that they play an important role in the dynamics of these states., We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ, and FINEP (Brazil); MOST and NSFC (China); CNRS/ IN2P3 (France); BMBF, DFG, and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MSHE (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); NSF (USA). Individual groups or members have received support from the AvH Foundation (Germany); EPLANET, Marie Skłodowska-Curie Actions and ERC (European Union); ANR, Labex P2IO and OCEVU, and R´egion Auvergne-Rhône-Alpes (France); the Key Research Program of Frontier Sciences of CAS, CAS PIFI, and the Thousand Talents Program (China); RFBR, RSF and Yandex LLC (Russia); GVA, XuntaGal and GENCAT (Spain); the Royal Society and the Leverhulme Trust (United Kingdom); the Laboratory Directed Research and Development program of LANL (USA); and CONACYT (Mexico)
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- 2019
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12. Exploring Possible Triangle Singularities in the Ξb−→K−J/ψΛ Decay.
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Shen, Chao-Wei, Jing, Hao-Jie, Guo, Feng-Kun, and Wu, Jia-Jun
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TRIANGLES ,QUANTUM numbers ,NUMBER systems ,MASS spectrometry - Abstract
We analyze possible singularities in the J / ψ Λ invariant mass distribution of the Ξ b − → K − J / ψ Λ process via triangle loop diagrams. Triangle singularities in the physical region are found in 18 different triangle loop diagrams. Among those with Ξ * -charmonium- Λ intermediate states, the one from the χ c 1 Ξ (2120) Λ loop, which is located around 4628 MeV, is found the most likely to cause observable effects. One needs S- and P-waves in χ c 1 Λ and J / ψ Λ systems, respectively, when the quantum numbers of these systems are 1 / 2 + or 3 / 2 + . When the quantum numbers of the Ξ (2120) are J P = 1 / 2 + , 1 / 2 − or 3 / 2 + , the peak structure should be sharper than the other J P choices. This suggests that although the whole strength is unknown, we should pay attention to the contributions from the Ξ * -charmonium- Λ triangle diagram if structures are observed in the J / ψ Λ invariant mass spectrum experimentally. In addition, a few triangle diagrams with the D s 1 * (2700) as one of the intermediate particles can also produce singularities in the J / ψ Λ distribution, but at higher energies above 4.9 GeV. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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13. Predictions of High Energy Experimental Results
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Comay E.
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pionic beams ,Higgs boson ,High Energy Physics::Lattice ,High Energy Physics::Phenomenology ,glueballs ,pentaquarks ,High Energy Physics::Experiment ,lcsh:Physics ,lcsh:QC1-999 - Abstract
Eight predictions of high energy experimental results are presented. The predictions contain the $Sigma ^+$ charge radius and results of two kinds of experiments using energetic pionic beams. In addition, predictions of the failure to find the following objects are presented: glueballs, pentaquarks, Strange Quark Matter, magnetic monopoles searched by their direct interaction with charges and the Higgs boson. The first seven predictions rely on the Regular Charge-Monopole Theory and the last one relies on mathematical inconsistencies of the Higgs Lagrangian density.
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- 2010
14. Development of a Cryogenic Silicon Detector System and Study of Strange Particle Production in Deep Inelastic Scattering
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De Masi, Rita, Paul, Stephan (Prof. Dr.), and von Feilitzsch, Franz (Prof. Dr.)
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Physik ,Siliziumdetektor ,Pentaquarks ,tiefeinelastische Streuung ,Silicon detector ,deep inelastic scattering ,ddc:530 - Abstract
This work was done in the framework of the COMPASS experiment. Silicon detectors are used in COMPASS for the reconstruction of beam particle upstream of the target. The harsh radiation to which they are exposed degradates the detector's performance. A method to use reliably silicon detectors in high radiation environment is to operate them a cryogenic temperatures. At low temperatures the Charge Collection Efficiency (CCE) of heavily damaged silicon detectors has a dramatic increase, with a maximum at T=130 K ( Lazarus effect). In the first part of this work the design and realisation of a silicon microstrip detector system operated at cryogenic temperature have been discussed. During 2003 the detector system was installed and tested at 130 K in COMPASS, but only with some preliminary part of the equipment. The second part of this work has been devoted to the study of Ξ0* resonances and the search for a pentaquark candidate Ξ--, having a similar decay chain, with COMPASS. While a clean Ξ0* signal has been observed, there is no evidence of a Ξ--. The total cross section for Ξ0* and the upper limit for the Ξ-- have been estimated. Diese Arbeit ist im Rahmen des COMPASS Experimentes entstanden. Der erste Teil ist der Entwicklung und dem Aufbau eines Siliziumstreifendetektors gewidmet, dessen Aufgabe der Spurnachweis der einlaufenden Teilchen vor dem Target ist. Die dabei auftretende harte Strahlung hat eine Schädigung des Festkörperstruktur des Detectors zur Folge, und erfordert einen Betrieb des Detektors bei tiefen Temperaturen. Der sogenannte Lazarus Effekt verhindert den zunehmenden Verlust der Ladungssammlungseffizienz (CCE), mit einem Optimum bei T=130 K. Während der Datennahme im Jahre 2003 wurde das Detektorsystem installiert und bei 130 K getestet. Der zweite Teil dieser Arbeit befasst sich mit der Analyse der Ξ0*-Resonanz im COMPASS und der Suche nach dem Pentaquarkkandidaten Ξ-- mit ähnlicher Zerfallssignatur. Als Ergebnis konnte die Ξ0* Resonanz mit einem Wirkungsquerschnitt σ=71 pb nachgewiesen werden. Für Ξ-- wurde kein Signal gefunden und eine obere Grenze für den Wirkungsquerschnitt bestimmt.
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- 2015
15. Chiral soliton model vs. pentaquark structure for Θ(1540)
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Ramachandran, R.
- Published
- 2005
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16. Positive parity pentaquark towers in largeNcQCD
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Carlos Schat and Dan Pirjol
- Subjects
Quark ,Nuclear and High Energy Physics ,Particle physics ,Meson ,Ciencias Físicas ,FOS: Physical sciences ,PENTAQUARKS ,01 natural sciences ,purl.org/becyt/ford/1 [https] ,Particle decay ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,010306 general physics ,Hyperfine structure ,Physics ,Quantum chromodynamics ,010308 nuclear & particles physics ,High Energy Physics::Phenomenology ,Quark model ,purl.org/becyt/ford/1.3 [https] ,Pentaquark ,Astronomía ,Baryon ,High Energy Physics - Phenomenology ,High Energy Physics::Experiment ,CIENCIAS NATURALES Y EXACTAS ,1/Nc expansion - Abstract
We construct the complete set of positive parity pentaquarks, which correspond in the quark model to {\bar s} q^{Nc+1} states with one unit of orbital angular momentum L=1. In the large Nc limit they fall into the K=1/2 and K=3/2 irreps (towers) of the contracted SU(4)c symmetry. We derive predictions for the mass spectrum and the axial couplings of these states at leading order in 1/Nc. The strong decay width of the lowest-lying positive parity exotic state is of order O(1/Nc), such that this state is narrow in the large Nc limit. Replacing the antiquark with a heavy antiquark {\bar Q} q^{Nc+1}, the two towers become degenerate, split only by O(1/mQ) hyperfine interactions. We obtain predictions for the strong decay widths of heavy pentaquarks to ordinary baryons and heavy H(*)_{\bar Q} mesons at leading order in 1/Nc and 1/mQ., Comment: 21 pages, 2 figures, 5 tables
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- 2007
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17. Excited baryons and heavy pentaquarks in large Nc QCD
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Dan Pirjol and Carlos Schat
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Physics ,Quantum chromodynamics ,Nuclear and High Energy Physics ,Particle physics ,Ciencias Físicas ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,PENTAQUARKS ,Astronomía ,Baryon ,Matrix (mathematics) ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Excited state ,Nuclear Experiment ,CIENCIAS NATURALES Y EXACTAS ,1/Nc expansion - Abstract
We briefly discuss the large Nc picture for excited baryons, present a new method for the calculation of matrix elements and illustrate it by computing the strong decays of heavy exotic states., 3 pages, talk given at the 4th International Conference on Quarks and Nuclear Physics (QNP06), Madrid, Spain, June 5-10, 2006
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- 2006
18. Spectrum of the Y=2 Pentaquarks
- Author
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Francesco Tramontano, D. Falcone, and Franco Buccella
- Subjects
Physics ,Particle physics ,chromo-magnetic interaction ,QC1-999 ,High Energy Physics::Lattice ,Spectrum (functional analysis) ,pentaquarks ,High Energy Physics::Phenomenology ,General Physics and Astronomy ,FOS: Physical sciences ,12.39.ki ,State (functional analysis) ,Mass formula ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,12.40.yx ,High Energy Physics::Experiment - Abstract
By assuming a mass formula for the spectrum of the Y=2 pentaquarks, where the chromo-magnetic interaction plays a main role, and identifying the lightest state with the Theta^+(1540), we predict a spectrum in good agreement with the few I=0 and I=1 candidates proposed in the past., 12 pages, 4 figures, LaTeX
- Published
- 2005
19. Challenges in hadron physics
- Author
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Ulf-G. Meißner
- Subjects
Nuclear and High Energy Physics ,Particle physics ,Nuclear Theory ,baryon resonance [hyperon] ,High Energy Physics::Lattice ,pentaquarks ,FOS: Physical sciences ,Cracow 2004/06/04 [talk] ,hadroproduction [Theta(1540)] ,High Energy Physics - Experiment ,Nuclear Theory (nucl-th) ,width [Theta(1540)] ,quark ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,strangeness ,Hadron physics ,inelastic scattering [K+ deuteron] ,quantum chromodynamics ,ddc:530 ,inclusive reaction [K+ nucleus] ,pentaquark ,parity [Theta(1540)] ,Physics ,Quantum chromodynamics ,hadronic decay [Theta(1540)] ,hadron spectroscopy ,High Energy Physics::Phenomenology ,lattice field theory ,Astronomy and Astrophysics ,energy dependence [channel cross section] ,Atomic and Molecular Physics, and Optics ,coupled channel ,xenon ,(p K0) [mass spectrum] ,High Energy Physics - Phenomenology ,hadrons ,interpretation of experiments ,High Energy Physics::Experiment ,bound state [meson baryon] - Abstract
In this talk, I address some open problems in hadron physics and stress their importance for a better understanding of QCD in the confinement regime., Comment: Outlook talk at MESON 2004, Krakow, Poland, June 4-8, 2004, typos corrected
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- 2005
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20. Exclusive photoproduction of the cascade ($\Xi$) hyperons
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Alexei V. Klimenko, R. J. Feuerbach, D. Doughty, L. Elouadrhiri, Barry Ritchie, D. Heddle, Laird Kramer, K. Park, G. Rosner, L. C. Smith, S. J. Gaff, G. Ricco, I. I. Strakovsky, David Jenkins, R. Fatemi, A. V. Vlassov, Shifeng Chen, F. W. Hersman, E. Wolin, J. Kuhn, V. P. Kubarovsky, Hovanes Egiyan, Hall Crannell, A. Empl, K. Livingston, O. Pogorelko, P. Stoler, W. K. Brooks, R. W. Gothe, Roy Thompson, J. J. Melone, Friedrich Klein, L. C. Dennis, K. Y. Kim, H. Denizli, U. Thoma, H. Avakian, Brian Raue, C. Marchand, M. Osipenko, B. M. Preedom, V. Sapunenko, Valeria Muccifora, Sylvain Bouchigny, J. P. Ball, Y. Prok, M. Eckhause, J. J. Manak, Y. Kuang, M. Sanzone-Arenhovel, S. O. Nelson, Susan Taylor, K. Hicks, G. V. O'Rielly, J. Connelly, A. V. Skabelin, Gerard Gilfoyle, B. B. Niczyporuk, E. Anciant, W. J. Briscoe, E. Pasyuk, J. T. Goetz, K. S. Egiyan, K. Beard, J. P. Santoro, E. Polli, P. Eugenio, M. Taiuti, N. Pivnyuk, J. Napolitano, R. A. Miskimen, H. G. Juengst, D. G. Crabb, G. S. Mutchler, N. Guler, S. A. Dytman, G. E. Dodge, M. Khandaker, P. V. Degtyarenko, K. Kim, K. Sabourov, J. P. Cummings, C. A. Meyer, A.V. Stavinsky, P. Rossi, G. A. Peterson, Elton Smith, K. Mikhailov, W. Major, W. Kim, S. McAleer, M. Kossov, I. Niculescu, V. Gyurjyan, D. Lawrence, G. Niculescu, B. E. Stokes, G. S. Adams, Federico Ronchetti, D. Branford, M. Mirazita, J. M. Laget, K. Wang, C. Salgado, A. Tkabladze, P. L. Cole, J. Lachniet, B. M. K. Nefkens, D. Rowntree, V. Frolov, K. Joo, S. Barrow, D. J. Tedeschi, S. Strauch, Rakhsha Nasseripour, D. P. Weygand, M. Anghinolfi, D. G. Ireland, M. Guillo, R. A. Schumacher, James Mueller, J. Shaw, Michael Wood, L. Farhi, P. D. Rubin, M. M. Ito, J. R. Calarco, J. W. Price, G. Riccardi, I. Hleiqawi, S. Simionatto, Y. G. Sharabian, V. S. Serov, R. DeVita, Ji Li, H. Bagdasaryan, C. Butuceanu, J. W C McNabb, M. Bellis, R. S. Hakobyan, Dinko Pocanic, C. I O Gordon, D. Hancock, K. L. Giovanetti, B. Asavapibhop, K. A. Griffioen, D. Protopopescu, A. Coleman, M. D. Mestayer, S. A. Morrow, H. R. Weller, C. Djalali, M. Spraker, Larry Weinstein, S. E. Kuhn, S. Pozdniakov, L. Morand, J. H. Kelley, T. A. Forest, Michael L. Williams, J. Hu, C. Tur, S. Stepanyan, A. Shafi, O. P. Dzyubak, J. L. Ducote, S. Boiarinov, P. Ambrozewicz, J. D. Kellie, John T. O'Brien, Avraham Klein, P. Corvisiero, M. Witkowski, Bernhard Mecking, K. V. Dharmawardane, C. Cetina, Y. Ilieva, L. Guo, M. Ungaro, Michael Vineyard, B. Carnahan, L. Todor, F. Sabatié, P. Dragovitsch, M. Battaglieri, Thierry Auger, R. Bradford, K. Lukashin, Nicola Bianchi, R. A. Niyazov, J. Yun, D. Cords, B. L. Berman, L. M. Qin, S. Niccolai, A. Yegneswaran, M. Klusman, J. Hardie, E. De Sanctis, D. I. Sober, A. I. Ostrovidov, Volker D. Burkert, A. S. Biselli, J. Langheinrich, S. A. Philips, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Bektasoglu, M. Nozar, M. Guidal, M. Holtrop, Thomas E. Smith, G. Gavalian, N. Benmouna, M. Ripani, Cynthia Marie Hadjidakis, Michael Dugger, H. O. Funsten, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and CLAS
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Physics ,BARYONS ,Nuclear and High Energy Physics ,Particle physics ,13.60.Rj, 25.20.Lj, 14.20.Jn ,010308 nuclear & particles physics ,Hyperon ,FOS: Physical sciences ,PENTAQUARKS ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,Particle identification ,INCLUSIVE PHOTOPRODUCTION, PENTAQUARKS, BARYONS ,Cascade ,Excited state ,0103 physical sciences ,Production (computer science) ,Nuclear Experiment (nucl-ex) ,010306 general physics ,Ground state ,INCLUSIVE PHOTOPRODUCTION ,Nuclear Experiment ,Spin-½ - Abstract
We report on the first measurement of exclusive Xi-(1321) hyperon photoproduction in gamma p --> K+ K+ Xi- for 3.2 < E(gamma) < 3.9 GeV. The final state is identified by the missing mass in p(gamma,K+ K+)X measured with the CLAS detector at Jefferson Laboratory. We have detected a significant number of the ground-state Xi-(1321)1/2+, and have estimated the total cross section for its production. We have also observed the first excited state Xi-(1530)3/2+. Photoproduction provides a copious source of Xi's. We discuss the possibilities of a search for the recently proposed Xi5-- and Xi5+ pentaquarks., submitted to Phys. Rev. C
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- 2005
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21. Coloured s-wave quark clusters with flavour symmetry breaking
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Hogaasen, H. and Sorba, P.
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hadron spectroscopy ,chromomagnetism ,flavour symmetry breaking ,pentaquarks ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,High Energy Physics::Lattice ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,High Energy Physics::Experiment - Abstract
We study the properties of coloured three-particle s-wave quark clusters when flavour symmetry is broken. The relevance of such clusters for models of pentaquarks is shortly mentioned., Proučavamo svojstva obojenih tročestičnih s-valnih kvarkovskih grozdova s lomljenjem okusne simetrije. Kratko se spominje važnost tih grozdova za pentakvarkovske modele.
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- 2004
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22. Relativistic five-quark equations and u, d- pentaquark spectroscopy
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V. I. Kochkin and S. M. Gerasyuta
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Quark ,Nuclear and High Energy Physics ,Particle physics ,Meson ,dispersion relation ,High Energy Physics::Lattice ,pentaquarks ,Nuclear Theory ,FOS: Physical sciences ,General Physics and Astronomy ,dispersion relation technique ,High Energy Physics - Phenomenology (hep-ph) ,Dispersion relation ,ddc:530 ,vertex function ,Spectroscopy ,numerical calculations ,Nuclear Experiment ,Physics ,up ,High Energy Physics::Phenomenology ,relativistic [quark] ,singularity [amplitude analysis] ,down ,Pentaquark ,High Energy Physics - Phenomenology ,Amplitude ,High Energy Physics::Experiment ,mass spectrum [pentaquark] - Abstract
The relativistic five-quark equations are found in the framework of the dispersion relation technique. The five-quark amplitudes for the low-lying pentaquarks including u, d quarks are calculated. The poles of the five-quark amplitudes determine the masses of the lowest pentaquarks. The calculation of pentaquark amplitudes estimates the contributions of four subamplitudes. The main contributions to the pentaquark amplitude are determined by the subamplitudes, which include the meson states M., 21 pages, pdf
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- 2003
- Full Text
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23. Rise and fall of pentaquarks in the QCD sum rules approach
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Ricardo D'Elia Matheus, Navarra, F. S., and Nielsen, M.
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Mass and decay ,High Energy Physics::Experiment ,Pentaquarks ,QCD Sum Rules - Abstract
We review the existing mass and decay width determinations of pentaquarks with QCD Sum Rules (QCDSR). We give special attention to the intermediate assumptions and choices which we are obliged to do in this approach. As an example, we present the full calculation of the pentaquark mass with Borel sum rules and also with Finite Energy Sum Rules (FESR). We also work out the calculation of the theta decay width. We take the opportunity to comment our publications on this subject and include new and unpublished material.
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