\\psi \\varLambda K^-$ decay Article Swipe

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R. Aaij , D. Torres Machado , Matthew John Bradley , G. Ciezarek , M. W. Dudek , P. Collins , Steffen Georg Weber , W. B. Qian , H. Sazak , Achim Vollhardt , S. Meloni , A. Piucci , J. C. Smallwood , S. Maccolini , L. R. Madhan Mohan , M. Merk , P. Garcia Moreno , K. Gizdov , Marie-Noelle Minard , D. Berninghoff , P. Krokovny , G. Morello , A. Merli , T. H. McGrath , Thi Dung Nguyen , C. Giugliano , Ryan Newcombe , G. Pietrzyk , P. N. Swallow , L. Kravchuk , T. Ovsiannikova , Mikkel Bjørn , Shuangli Yang , Menglin Xu , Yutong Li , I. Polyakov , V. Chobanova , T. Kirn , K. R. Mattioli , M. Palutan , L. G. Scantlebury Smead , N. Tuning , A. Dendek , B. Pietrzyk , S. Bachmann , Marie Bachmayer , Zhenzi Wang , C. Trippl , K. Carvalho Akiba , Timothy Evans , G. Punzi , D. Y. Tou , N. Harnew , S. Escher , F. C. R. Bishop , M. Chrząszcz , A. Boyer , S. Jakobsen , S. Perazzini , G. Haefeli , S. Stone , M. Idzik , J. B. Zonneveld , Guanghua Gong , F. Maciuc , T. Szumlak , M. Materok , D. Pinci , M. Lucio Martínez , E. Ursov , H. Wu , Y. Zheng , D. P. O’Hanlon , D. Strekalina , J. Dalseno , R. Waldi , S. Popov , N. Nikitin , Sara Elizabeth Mitchell , V. Chulikov , Louis Lenard Gerken , M. Atzeni , S. Stahl , S. Neubert , A. Ishteev , Christopher Jones , R. E. Geertsema , M. Zavertyaev , E. Smith , T. Lin , M. Schellenberg , A. Danilina , J. P. Grabowski , J. M. Basels , M. Needham , B. Schmidt , D. Galli , C. Hasse , T. Ackernley , T. Halewood-leagas ·

YOU? · · 2020 · Open Access ·

First evidence of a structure in the $J/\\psi \\varLambda$ invariant mass distribution is obtained from an amplitude analysis of $\\varXi_b^- \\to J/\\psi \\varLambda K^-$ decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness. Its mass and width are determined to be $4458.8\\pm2.9\\,^{+4.7}_{-1.1}$MeV and $17.3\\pm6.5\\,^{+8.0}_{-5.7}$MeV, where the quoted uncertainties are statistical and systematic, respectively. The structure is also consistent with being due to two resonances. In addition, the narrow excited $\\varXi^-$ states, $\\varXi(1690)^-$ and $\\varXi(1820)^-$, are seen for the first time in a $\\varXi_b^-$ decay, and their masses and widths are measured with improved precision. The analysis is performed using $pp$ collision data corresponding to a total integrated luminosity of 9fb$^{-1}$, collected with the LHCb experiment at centre-of-mass energies of $7$, $8$ and $13$TeV.

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Physics Pentaquark Excited state Invariant mass Particle physics Luminosity Nuclear physics Amplitude Quark Astrophysics Galaxy Quantum mechanics

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Type: preprint
Language: en
Landing Page: http://cds.cern.ch/record/2748269
PDF: http://cds.cern.ch/record/2748269
OA Status: green
Cited By: 13
References: 37
Related Works: 20
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Title: Evidence of a $J/\\psi \\varLambda$ structure and observation of excited $\\varXi^-$ states in the $\\varXi_b^-\\to J/\\psi \\varLambda K^-$ decay

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Type: preprint

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Language: en

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Publication year: 2020

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Publication date: 2020-12-18

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Authors: R. Aaij, D. Torres Machado, Matthew John Bradley, G. Ciezarek, M. W. Dudek, P. Collins, Steffen Georg Weber, W. B. Qian, H. Sazak, Achim Vollhardt, S. Meloni, A. Piucci, J. C. Smallwood, S. Maccolini, L. R. Madhan Mohan, M. Merk, P. Garcia Moreno, K. Gizdov, Marie-Noelle Minard, D. Berninghoff, P. Krokovny, G. Morello, A. Merli, T. H. McGrath, Thi Dung Nguyen, C. Giugliano, Ryan Newcombe, G. Pietrzyk, P. N. Swallow, L. Kravchuk, T. Ovsiannikova, Mikkel Bjørn, Shuangli Yang, Menglin Xu, Yutong Li, I. Polyakov, V. Chobanova, T. Kirn, K. R. Mattioli, M. Palutan, L. G. Scantlebury Smead, N. Tuning, A. Dendek, B. Pietrzyk, S. Bachmann, Marie Bachmayer, Zhenzi Wang, C. Trippl, K. Carvalho Akiba, Timothy Evans, G. Punzi, D. Y. Tou, N. Harnew, S. Escher, F. C. R. Bishop, M. Chrząszcz, A. Boyer, S. Jakobsen, S. Perazzini, G. Haefeli, S. Stone, M. Idzik, J. B. Zonneveld, Guanghua Gong, F. Maciuc, T. Szumlak, M. Materok, D. Pinci, M. Lucio Martínez, E. Ursov, H. Wu, Y. Zheng, D. P. O’Hanlon, D. Strekalina, J. Dalseno, R. Waldi, S. Popov, N. Nikitin, Sara Elizabeth Mitchell, V. Chulikov, Louis Lenard Gerken, M. Atzeni, S. Stahl, S. Neubert, A. Ishteev, Christopher Jones, R. E. Geertsema, M. Zavertyaev, E. Smith, T. Lin, M. Schellenberg, A. Danilina, J. P. Grabowski, J. M. Basels, M. Needham, B. Schmidt, D. Galli, C. Hasse, T. Ackernley, T. Halewood-leagas

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Concepts: Physics, Pentaquark, Excited state, Invariant mass, Particle physics, Luminosity, Nuclear physics, Amplitude, Quark, Astrophysics, Galaxy, Quantum mechanics

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Cited by: 13

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