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1,750 results on '"HADRON spectroscopy"'

2. Branching fractions of fully bottom tetraquark decays in ηb, Υ, BqBq¯, Bq∗Bq∗¯ mesons, μ+μ- and four muons: Branching fractions of fully bottom tetraquark decays: R Mistry and A Majethiya.

Author

Mistry, Rahulbhai and Majethiya, Ajay

Abstract

S-wave masses, decay rates, and branching fractions of J PC = 0 + + and 2 + + b b b ¯ b ¯ tetraquark states are investigated within the framework of the non-relativistic diquark-antidiquark picture. The interaction potential between the diquarks and antidiquarks is assumed to be a Coulomb plus power-law potential with a power index varying from 0.1 to 2.0. To resolve the ground state mass degeneracy of b b b ¯ b ¯ tetraquark states, we incorporate perturbative spin–spin interaction potentials. Decay rates and branching fractions of b b b ¯ b ¯ decays in various mesonic and leptonic channels, including η b , Υ , B q B q ¯ , B q ∗ B q ∗ ¯ mesons, μ + μ - and 4 μ muons, are computed using the resulting wave functions, mass spectra and other spectroscopic parameters. Our findings closely match other existing theoretical results. [ABSTRACT FROM AUTHOR]

Published
2025
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3. Exploring Light Meson Resonances in Two-Pion Photoproduction: A Regge Formalism Analysis.

Author

Bibrzycki, Łukasz, Hammoud, Nadine, Mathieu, Vincent, Perry, Robert J., and Szczepaniak, Adam P.

Subjects
*MESONS, *RESONANCE, *PIONS, *HADRON spectroscopy, *ANGULAR momentum (Nuclear physics), *REGGE formalism
Abstract

In the domain of hadron spectroscopy, the investigation of meson resonances plays a pivotal role. This study focuses on the significance of twopion photoproduction as a prominent avenue for studying meson resonances in the ππ system. By employing the Regge formalism, our model incorporates the background contribution from the well-known "Deck Mechanism" and emphasizes the significant ρ(770) resonance, representing the P-wave contribution arising from pomeron and f2 exchanges. The model is extended by accounting for scalar mesons, namely σ, f0(980) and f0(1370), contributing to the S-wave behavior, as well as the tensor meson f2(1270) corresponding to the D-wave contributions, while also considering non-resonant P- and S-wave components. The model contains a number of free parameters, which are constrained from a global fit of the available experimental data for angular moments up to L = 2 for M = 0, ..., 2. The fitted angular moments are compared with experimental data obtained from CLAS. The key physical insights gained from the model are summarized. Furthermore, we extract the t-dependence of the Regge amplitude residue function for the subdominant exchanges, shedding light on their contribution to the overall dynamics. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Hadron Spectroscopy with lattice QCD: Challenges and opportunities.

Author

Bulava, John

Subjects
*HADRON spectroscopy, *LATTICE quantum chromodynamics, *BOUND states, *BARYONS, *SCATTERING (Physics)
Abstract

Ongoing challenges in computing the spectrum of hadronic resonances and shallow bound-states from lattice QCD are reviewed. Since such states are identified as poles in the scattering matrix, nearby non-analyticities must be treated to analytically continue to complex center-of-mass energies. Significant lattice spacing effects have also been observed in some channels, necessitating a continuum limit. Recent achievements are also highlighted, including lattice investigations of states in the charm region, baryon-baryon scattering, and the first coupled channel meson-baryon amplitude in the Λ(1405) channel. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Exotic Hadrons at LHCb.

Author

Johnson, Daniel, Polyakov, Ivan, Skwarnicki, Tomasz, and Wang, Mengzhen

Abstract

It has been 5 years since the data sample from the LHCb detector, the first experiment optimized for heavy-flavor physics studies at a hadronic collider, was completed. These data led to many major discoveries in exotic hadron spectroscopy, which we review in this article. We supplement the experimental results with a selection of phenomenological interpretations. As the upgraded LHCb detector is expected to collect a larger data sample starting in 2024, we also discuss the potential of the LHCb program in exotic hadron physics for the near future and beyond. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Hyperons in neutron stars: studies of hyperon spectroscopy and the hyperon–nucleon interaction with the K-long Facility.

Author

Zachariou, N., Fegan, S., Watts, D., and Bashkanov, M.

Subjects
*ATOMIC nucleus, *NUCLEAR physics, *NEUTRON stars, *EXCITATION spectrum, *ATOMIC structure, *HYPERONS
Abstract

Elucidating the role of strange baryons (hyperons) in neutron stars requires detailed knowledge of hyperon–nucleon interactions in the light (u,d,s) quark sector. The structure of the hyperons and their excitation spectra also directly impact, and are an input to, models of big-bang nucleosynthesis. The upcoming K-long Facility will provide a much-needed intense and clean neutral strange meson beam, from which hyperons can be produced at rates where hyperon structure, hyperon–nucleon interactions and higher-order interactions can be studied with a new level of accuracy and for hitherto unreachable measurements. The new facility has the potential to address long-standing questions surrounding the strange sector of the strong force and its relevance to the structure of atomic nuclei, neutron stars and the cosmos at large. This article is part of the theme issue 'The liminal position of Nuclear Physics: from hadrons to neutron stars'. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Search for Θ+ in KLp→K+n reaction in KLF at JLab.

Author

Amaryan, Moskov J., Hirama, Shu, Jido, Daisuke, and Strakovsky, Igor I.

Subjects
*PENTAQUARK, *HADRONS, *POSSIBILITY
Abstract

The possibility of the existence of multiquark hadrons made of 4-quarks for mesons and 5-quarks for baryons was predicted by Gell-Mann [Phys. Lett. 8, 214 (1964)]. The renewed interest for the search for exotic pentaquark states was initiated by the paper by Diakonov, Petrov, and Polyakov [Z. Phys. A 359, 305 (1997)]. The 2003 experimental reports on the observation of Θ + pentaquark with u u d d s ̄ quark content created a great excitement and many following experiments have reported its observation [K. H. Hicks, Eur. Phys. J. H 37, 1 (2012)]. After high-statistics experiments at JLab, which did not confirm previous claims by the CLAS collaboration, the community concluded that the Θ + pentaquark either does not exist at all or has an extremely small cross-section, making it currently unobserved. There were different review papers on this subject, questioning the existence of Θ + or trying to explain the reasons why reaching a conclusion based on production experiments is challenging [M. Amaryan, Eur. Phys. J. Plus 137, 684 (2022)]. To address the challenge of minimal 3-body final states, a formation experiment with a projectile-kaon beam is proposed. In the following, we discuss how the Θ + could be observed in the K L p → Θ + → K + n reaction in the KLF experiment at JLab [M. Amaryan et al. [KLF Collaboration], arXiv:2008.08215 [nucl-ex]]. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Color symmetry and confinement as an underlying superconformal structure in holographic QCD.

Author

de Téramond, Guy F. and Brodsky, Stanley J.

Subjects
*QUANTUM chromodynamics, *QUANTUM numbers, *TETRAQUARK, *SYMMETRY, *CONFORMAL field theory, *SUPERSYMMETRY, *QUARKS
Abstract

Dedicated to the memory of our colleague, Harald Fritzsch, who, together with Murray Gell-Mann, introduced the color quantum number as the exact symmetry responsible for the strong interaction, thus establishing quantum chromodynamics (QCD) as a fundamental non-Abelian gauge theory. A basic understanding of hadron properties, however, such as confinement and the emergence of a mass scale, from first principles QCD has remained elusive: Hadronic characteristics are not explicit properties of the QCD Lagrangian and perturbative QCD, so successful in the large transverse momentum domain, is not applicable at large distances. In this article, we shall examine how this daunting obstacle is overcome in holographic QCD with the introduction of a superconformal symmetry in anti de Sitter (AdS) space which is responsible for confinement and the introduction of a mass scale within the superconformal group. When mapped to light-front coordinates in physical spacetime, this approach incorporates supersymmetric relations between the Regge trajectories of meson, baryon and tetraquark states which can be visualized in terms of specific S U (3) C color representations of quarks. We will also briefly discuss here the implications of holographic models for QCD color transparency in view of the present experimental interest. [ABSTRACT FROM AUTHOR]

Published
2024
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10. Investigation of Ωccb and Ωcbb baryons in Regge phenomenology.

Author

Oudichhya, Juhi, Gandhi, Keval, and Rai, Ajay Kumar

Subjects
*PHENOMENOLOGY, *BARYONS, *MAGNETIC moments, *EXCITED states, *MAGNETIC properties
Abstract

Triply heavy baryons with quark content ccb and cbb are investigated within the framework of Regge phenomenology. With the assumption of linear Regge trajectories, we have extracted the relations between Regge parameters and baryon masses. Using these relations, we compute the ground-state masses of Ω ccb and Ω cbb baryons. Further, the Regge slopes and intercepts are estimated for these baryons to obtain the excited state masses in the (J , M 2) and (n , M 2) planes. Also, using the obtained results we calculated other properties like magnetic moment and radiative decay width of these triply heavy baryons. We compared our evaluated results with those obtained by other theoretical approaches, and our results show a general agreement with them. The present study and our predictions will provide significant clues for future experimental research of these unseen triply heavy baryons. [ABSTRACT FROM AUTHOR]

Published
2023
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11. The scattering of spinning hadrons from lattice QCD

Author

Woss, Antoni James and Thomas, Christopher

Subjects
539.7, Quantum chromodynamics, lattice, lattice gauge theories, hadron spectroscopy
Abstract

Hadron spectroscopy is predominantly the study of resonances that decay via the strong interaction into a multitude of stable hadrons, such as the pion. The vast majority of resonances decay via an intermediate hadron with non-zero intrinsic spin. In this thesis, I will present the results of scattering calculations featuring mesons with non-zero intrinsic spin. Before doing so, I will first give a brief introduction to QCD and review the framework necessary to perform lattice QCD calculations in Chapters 1 and 2. In Chapter 3, I present the first lattice calculation of $\rho \pi$ scattering in isospin-2. Here, $\rho\pi$ features in dynamically-coupled $^3{S}_1$ and $^3{D}_1$ partial-waves with $J^P=1^+$. No resonance enhancement is anticipated in the flavour exotic isospin-2 channel and as such it provides an ideal testing ground for this first calculation. I work at heavier than physical quark masses at the $\text{SU}(3)_{\text{F}}$ point where the up, down and strange quarks are mass degenerate. Finite-volume spectra are calculated and, utilising the relationship between the discrete energy spectrum and the infinite-volume scattering amplitudes, partial-wave amplitudes with $J \le 3$ and the degree of dynamical mixing between the coupled $^3{S}_1$ and $^3{D}_1$ channels are determined. In Chapter 4, I investigate $\rho\pi$ in isospin-1 where the $a_1$ axial-vector resonance is expected to feature. Here, I present a discussion on $G$-parity and Bose-symmetry at the $\text{SU}(3)_{\text{F}}$ point. Working at heavier than physical quark masses, the resulting finite volume spectrum suggests that the $a_1$ is a bound-state and that the $^3{S}_1$- and $^3{D}_1$-wave, $\rho\pi$ scattering amplitudes are similar to those in isospin-2. I present the first calculation of coupled $\pi\omega$ and $\pi\phi$ scattering in Chapter 5 where resonant enhancement is seen experimentally in the $J^P=1^+$ channel. Working at a somewhat lighter pion mass than in previous chapters, the finite-volume spectra are determined and the scattering amplitudes are calculated. Analytically continuing the amplitudes into the complex energy plane, a resonance pole is found, interpreted as the analogue of the $b_1$ axial-vector, which couples dominantly to $^3{S}_1$-wave $\pi\omega$, with a much-suppressed coupling to $^3{D}_1$-wave $\pi\omega$, and a negligible coupling to $\pi\phi$. In Chapter 6, the exotic $J^{PC}=1^{-+}$ channel is studied. These quantum numbers are not allowed in the quark model but can be obtained, for example, through a gluonic excitation coupled to a quark-antiquark pair. In this exploratory calculation, performed at the $\text{SU}(3)_\text{F}$ point, the finite-volume spectra and coupled-channel scattering amplitudes are presented. A single resonance pole is found, interpreted as the exotic $\pi_1$, and couplings to meson-meson channels, including for example $\pi\eta\{^1{P}_1\}$, $\pi\eta'\{^1{P}_1\}$ and $\rho\pi\{^3{P}_1\}$, are calculated for the first time in lattice QCD. In order to minimally present the contents of a unitary $n$-channel scattering matrix, I introduce, in Chapter 7, an $n$-channel generalisation of the traditional two-channel Stapp parameterisation.

Published
2019
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12. Spectroscopy of exotic charm mesons from lattice QCD

Author

Cheung, Gavin and Thomas, Christopher

Subjects
539.7, Lattice QCD, Exotic mesons, Hadron Spectroscopy
Abstract

Exotic mesons are mesons that cannot be described as a quark-antiquark pair. The number of exotic mesons has been growing every year in the charm sector and the theoretical understanding of them is often conflicted amongst the community. Some possible explanations include hybrid mesons where the quark-antiquark pair is coupled to a gluonic excitation, compact tetraquarks where four quarks are bound into a localised state and molecules which consist of pairs of extended mesons. To study exotic mesons from first principles, lattice QCD provides the framework to perform spectroscopy calculations numerically. I will give a review and describe the relevant techniques used in this thesis. After doing so, I will calculate masses of charmonium with angular momentum up to four. The results show QCD permits states with exotic quantum numbers that are not accessible by a quark-antiquark pair. I will identify states that are consistent with the quark-antiquark picture and then show that the remaining states in the extracted spectra can be interpreted to be the lightest and first excited hybrid meson supermultiplet. Whilst the mass is one quantity that can be computed, hadron spectroscopy is also concerned with the calculation of the unstable properties of resonances which can decay into meson-meson states. These meson-meson states have four quarks and could also mix with tetraquarks. I will describe how to correctly extract the energies of four quark states within lattice QCD by reviewing operators resembling meson-mesons and then constructing a general class of operators resembling tetraquarks. I will then calculate a variety of spectra in the isospin-1 hidden charm sector and the doubly charmed sector. No evidence of a bound state or narrow resonance is found in these channels. Having described how to include multi-meson states in lattice QCD, I will describe how to relate the lattice QCD spectrum to the scattering amplitudes and perform a calculation of elastic $DK$ scattering amplitudes which is relevant for the exotic $D_{s0}(2317)$. By analytically continuing the scattering amplitudes into the complex plane, I find a bound state pole near threshold which is in good agreement with what is found experimentally.

Published
2019
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13. Lattice perspectives on doubly heavy tetraquarks.

Author

Francis, Anthony

Subjects
*BOUND states, *BINDING energy, *HADRONS, *QUANTUM chromodynamics, *QUARKS
Abstract

Doubly heavy tetraquarks have emerged as new probes to study the heavy hadron spectrum. With the experimental observation of the J P = 1 + T c c + , they pose a unique opportunity to bring together efforts in experiment, phenomenology, and lattice QCD. In lattice calculations they are accessible as ground states, unlike hidden flavor tetraquarks, and this enables accurate determinations of the scattering parameters alongside the binding energies of these tetraquarks. Today, lattice calculations firmly predict J P = 1 + T b b u d and T b b u s as QCD bound states, while recent studies approaching the J P = 1 + T c c u d find it to be a virtual bound state at slightly non-physical input quark masses. Studies of the J P = 1 + T b c u d are ongoing and a new focus area. In light of these developments the evolution of this field until this point is reviewed. Emphasis is put on the methods in lattice spectroscopy that enable a robust evaluation of the lattice studies gathered. They are further reviewed towards their limitations and achievements. Current challenges and opportunities are discussed, including possibilities to approach the left-hand cut in the scattering analysis of the charm candidates and towards understanding the structure of those including two bottom quarks. [ABSTRACT FROM AUTHOR]

Published
2025
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14. Studies of Bs2∗(5840)0 and Bs1(5830)0 mesons including the observation of the Bs2∗(5840)0→B0KS0 decay in proton-proton collisions at s=8TeV

Author

Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Asilar, E, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Del Valle, A Escalante, Flechl, M, Frühwirth, R, Ghete, VM, Hrubec, J, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Rohringer, H, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Taurok, A, Waltenberger, W, Wittmann, J, Wulz, C-E, Zarucki, M, Chekhovsky, V, Mossolov, V, Gonzalez, J Suarez, De Wolf, EA, Di Croce, D, Janssen, X, Lauwers, J, Pieters, M, Van Haevermaet, H, Van Mechelen, P, Van Remortel, N, Zeid, S Abu, Blekman, F, D’Hondt, J, De Bruyn, I, De Clercq, J, Deroover, K, Flouris, G, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Moreels, L, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Van Parijs, I, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Fasanella, G, Favart, L, Goldouzian, R, Grebenyuk, A, Kalsi, AK, Lenzi, T, Luetic, J, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wang, Q, Cornelis, T, Dobur, D, Fagot, A, Gul, M, Khvastunov, I, Poyraz, D, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, Bakhshiansohi, H, Bondu, O, Brochet, S, Bruno, G, Caputo, C, and David, P

Subjects
CMS, Physics, b hadrons, Heavy flavour spectroscopy, Hadron spectroscopy, Experimental results, CMS Collaboration, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

Measurements of Bs2∗(5840)0 and Bs1(5830)0 mesons are performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of , collected with the CMS detector at the LHC at a centre-of-mass energy of 8TeV . The analysis studies P-wave Bs0 meson decays into B(∗)+K- and B(∗)0KS0 , where the B+ and B0 mesons are identified using the decays B+→J/ψK+ and B0→J/ψK∗(892)0 . The masses of the P-wave Bs0 meson states are measured and the natural width of the Bs2∗(5840)0 state is determined. The first measurement of the mass difference between the charged and neutral B∗ mesons is also presented. The Bs2∗(5840)0 decay to B0KS0 is observed, together with a measurement of its branching fraction relative to the Bs2∗(5840)0→B+K- decay.

Published
2018

15. Spectroscopic Properties of Light Baryon.

Author

Menapara, Chandni and Rai, Ajay Kumar

Subjects
*SPECTROMETRY, *BARYONS, *HADRON spectroscopy, *RESONANCE, *PARTICLES (Nuclear physics)
Abstract

Hadron Spectroscopy provides a realm to study the internal quark dynamics within the hadrons through phenomenological, theoretical as well as experimental approaches. In the present article, an attempt has been made to exploit the nucleon N resonances using a non-relativistic hypercentral Constituent Quark Model (hCQM). The properties are studied based on the linear nature of confining part of the potential. The 1S-5S, 1P-3P, 1D-2D and 1F states mostly with four star labelled resonances are explored again with the separation of charge states using different constituent quark masses. Also, Regge trajectories for some obtained states are plotted for examining the linear nature. [ABSTRACT FROM AUTHOR]

Published
2022
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17. Extending light-front holographic QCD using the 't Hooft Equation

Author

Mohammad Ahmady, Harleen Dahiya, Satvir Kaur, Chandan Mondal, Ruben Sandapen, and Neetika Sharma

Subjects
Light-front holography, 't Hooft equation, Hadron spectroscopy, Longitudinal dynamics, Physics, QC1-999
Abstract

We show the 't Hooft Equation and the light-front holographic Schrödinger Equation are complementary to each other in governing the transverse and longitudinal dynamics of colour confinement in quark-antiquark mesons. Together, they predict remarkably well the light, heavy-light and heavy-heavy meson spectroscopic data. The universal emerging hadronic scale of light-front holography, κ≈0.5 GeV, controls the transverse dynamics of confinement in all these mesons. In heavy-heavy mesons, it also coincides numerically with the 't Hooft coupling which governs longitudinal confinement, thus reflecting the restoration of manifest 3-dimensional rotational symmetry.

Published
2021
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18. A Fit to the Available e+e- → Λc+Λc- Cross Section Data Nearby Production Threshold by Means of a Strong Correction to the Coulomb Enhancement Factor.

Subjects
*HADRON spectroscopy, *HYPERONS, *PARTICLES, *BARYONS, *RADIATION
Abstract

There are two available sets of data on the e+e- → Λc+Λc- cross section at energies close to the production threshold, collected by the Belle and by the BESIII Collaborations. The measurement of the former, performed by means of the initial state radiation technique, is compatible with the presence of a resonance, called y(4660), observed also in other final states. On the contrary, the latter is measured an almost flat and hence non-resonant cross section in the energy region just above the production threshold, but the data stop before the possible rise in the cross section for the resonant production. We propose an effective model to describe the behavior of the data near this threshold, which is based on a Coulomb-like enhancement factor due to the strong interaction among the final state particles. In the framework of this model, it is possible to describe both datasets. [ABSTRACT FROM AUTHOR]

Published
2021
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20. Measurement of the G double-polarisation observable in positive pion photoproduction

Author

McAndrew, Josephine, Watts, Daniel., and Woods, Philip

Subjects
520, polorisation observables, hadron spectroscopy, proton, photoproduction
Abstract

Establishing the resonance spectrum of the nucleon with accuracy would provide important new information about the dynamics and degrees of freedom of its constituents. The spectrum and properties of nucleon resonances are a fundamental test of the emerging predictions from Lattice QCD calculations and will guide re finements to QCD-based phenomenological models. Pion photoproduction is an excellent tool to study the nucleon resonance spectrum, as this channel is expected to couple strongly to most resonances. The new generation of measurements for this reaction, of which the measurement presented in this thesis forms a crucial part, will provide a great improvement in the quality of available experimental data. For the photoproduction process in particular, the use of photon beams and targets with high degrees of polarisation, coupled with large acceptance particle detectors is essential for disentangling the spectrum of excited states. There are many nucleon resonances predicted by recent Lattice QCD calculations and by phenomenological nucleon models which are only observed inconsistently by different analyses of the same experimental data or which are not observed at all. It is of upmost importance to establish if this means that the resonances do not exist in nature, reflecting inappropriate degrees of freedom in the theoretical description of the nucleon or if the current experimental measurements have not been sensitive enough. As such, there is a current world effort at modern tagged photon facilities to measure the \complete set" of photoproduction observables necessary to fully constrain the partial wave analyses used to extract the experimental excitation spectrum from the data. This thesis will present the first detailed measurement to date of positive pion photoproduction in the 730-2300 MeV photon energy (1400-2280 MeV centre-of-mass energy) region with a linearly polarised photon beam and a longitudinally polarised proton target with a close-to-complete angular coverage in detection of the reaction products. This unique set up allows for the extraction of the double-polarisation observable, G. The data were taken as part of the g9 experiment at the Thomas Jefferson National Accelerator Facility in Virginia, using a tagged, polarised photon beam and the Frozen Proton Spin Target, FROST, in conjunction with the CEBAF Large Acceptance Spectrometer, CLAS. The results of the study presented here are compared to the sparse existing data set for the G double-polarisation observable along with the current solutions of the the three main partial wave analyses: MAID, SAID and Bonn-Gatchina. Some agreement is obtained with the expectations of these PWA at lower energies, while disagreement at higher energies is clearly evident. This is the energy region where many of the missing resonances are expected to lie. Once incorporated into the MAID, SAID and Bonn-Gatchina models, these new data will provide an important contribution to constraining the amplitudes and therefore the resonance spectrum and properties of the nucleon. The new data will form a central part of the world effort to accurately establish the nucleon excitation spectrum for the first time by achieving the first complete measurement of experimental observables in meson photoproduction.

Published
2012

21. Studies of $${\mathrm {B}} ^{*}_{{\mathrm {s}}2}(5840)^0 $$ Bs2∗(5840)0 and $${\mathrm {B}} _{{\mathrm {s}}1}(5830)^0 $$ Bs1(5830)0 mesons including the observation of the $${\mathrm {B}} ^{*}_{{\mathrm {s}}2}(5840)^0 \rightarrow {\mathrm {B}} ^0 \mathrm {K} ^0_{\mathrm {S}} $$ Bs2∗(5840)0→B0KS0 decay in proton-proton collisions at $$\sqrt{s}=8\,\text {TeV} $$ s=8TeV

Author

A. M. Sirunyan, A. Tumasyan, W. Adam, F. Ambrogi, E. Asilar, T. Bergauer, J. Brandstetter, M. Dragicevic, J. Erö, A. Escalante Del Valle, M. Flechl, R. Frühwirth, V. M. Ghete, J. Hrubec, M. Jeitler, N. Krammer, I. Krätschmer, D. Liko, T. Madlener, I. Mikulec, N. Rad, H. Rohringer, J. Schieck, R. Schöfbeck, M. Spanring, D. Spitzbart, A. Taurok, W. Waltenberger, J. Wittmann, C.-E. Wulz, M. Zarucki, V. Chekhovsky, V. Mossolov, J. Suarez Gonzalez, E. A. De Wolf, D. Di Croce, X. Janssen, J. Lauwers, M. Pieters, H. Van Haevermaet, P. Van Mechelen, N. Van Remortel, S. Abu Zeid, F. Blekman, J. D’Hondt, I. De Bruyn, J. De Clercq, K. Deroover, G. Flouris, D. Lontkovskyi, S. Lowette, I. Marchesini, S. Moortgat, L. Moreels, Q. Python, K. Skovpen, S. Tavernier, W. Van Doninck, P. Van Mulders, I. Van Parijs, D. Beghin, B. Bilin, H. Brun, B. Clerbaux, G. De Lentdecker, H. Delannoy, B. Dorney, G. Fasanella, L. Favart, R. Goldouzian, A. Grebenyuk, A. K. Kalsi, T. Lenzi, J. Luetic, N. Postiau, E. Starling, L. Thomas, C. Vander Velde, P. Vanlaer, D. Vannerom, Q. Wang, T. Cornelis, D. Dobur, A. Fagot, M. Gul, I. Khvastunov, D. Poyraz, C. Roskas, D. Trocino, M. Tytgat, W. Verbeke, B. Vermassen, M. Vit, N. Zaganidis, H. Bakhshiansohi, O. Bondu, S. Brochet, G. Bruno, C. Caputo, P. David, C. Delaere, M. Delcourt, A. Giammanco, G. Krintiras, V. Lemaitre, A. Magitteri, A. Mertens, M. Musich, K. Piotrzkowski, A. Saggio, M. Vidal Marono, S. Wertz, J. Zobec, F. L. Alves, G. A. Alves, M. Correa Martins Junior, G. Correia Silva, C. Hensel, A. Moraes, M. E. Pol, P. Rebello Teles, E. Belchior Batista Das Chagas, W. Carvalho, J. Chinellato, E. Coelho, E. M. Da Costa, G. G. Da Silveira, D. De Jesus Damiao, C. De Oliveira Martins, S. Fonseca De Souza, H. Malbouisson, D. Matos Figueiredo, M. Melo De Almeida, C. Mora Herrera, L. Mundim, H. Nogima, W. L. Prado Da Silva, L. J. Sanchez Rosas, A. Santoro, A. Sznajder, M. Thiel, E. J. Tonelli Manganote, F. Torres Da Silva De Araujo, A. 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Ignatenko, N. Mccoll, S. Regnard, D. Saltzberg, C. Schnaible, V. Valuev, E. Bouvier, K. Burt, R. Clare, J. W. Gary, S. M. A. Ghiasi Shirazi, G. Hanson, G. Karapostoli, E. Kennedy, F. Lacroix, O. R. Long, M. Olmedo Negrete, M. I. Paneva, W. Si, L. Wang, H. Wei, S. Wimpenny, B. R. Yates, J. G. Branson, S. Cittolin, M. Derdzinski, R. Gerosa, D. Gilbert, B. Hashemi, A. Holzner, D. Klein, G. Kole, V. Krutelyov, J. Letts, M. Masciovecchio, D. Olivito, S. Padhi, M. Pieri, M. Sani, V. Sharma, S. Simon, M. Tadel, A. Vartak, S. Wasserbaech, J. Wood, F. Würthwein, A. Yagil, G. Zevi Della Porta, N. Amin, R. Bhandari, J. Bradmiller-Feld, C. Campagnari, M. Citron, A. Dishaw, V. Dutta, M. Franco Sevilla, L. Gouskos, R. Heller, J. Incandela, A. Ovcharova, H. Qu, J. Richman, D. Stuart, I. Suarez, S. Wang, J. Yoo, D. Anderson, A. Bornheim, J. M. Lawhorn, H. B. Newman, T. Q. Nguyen, M. Spiropulu, J. R. Vlimant, R. Wilkinson, S. Xie, Z. Zhang, R. Y. Zhu, M. B. Andrews, T. Ferguson, T. Mudholkar, M. Paulini, M. Sun, I. Vorobiev, M. Weinberg, J. P. Cumalat, W. T. Ford, F. Jensen, A. Johnson, M. Krohn, E. MacDonald, T. Mulholland, R. Patel, A. Perloff, K. Stenson, K. A. Ulmer, S. R. Wagner, J. Alexander, J. Chaves, Y. Cheng, J. Chu, A. Datta, K. Mcdermott, N. Mirman, J. R. Patterson, D. Quach, A. Rinkevicius, A. Ryd, L. Skinnari, L. Soffi, S. M. Tan, Z. Tao, J. Thom, J. Tucker, P. Wittich, M. Zientek, S. Abdullin, M. Albrow, M. Alyari, G. Apollinari, A. Apresyan, A. Apyan, L. A. T. Bauerdick, A. Beretvas, J. Berryhill, P. C. Bhat, K. Burkett, J. N. Butler, A. Canepa, G. B. Cerati, H. W. K. Cheung, F. Chlebana, M. Cremonesi, J. Duarte, V. D. Elvira, J. Freeman, Z. Gecse, E. Gottschalk, L. Gray, D. Green, S. Grünendahl, O. Gutsche, J. Hanlon, R. M. Harris, S. Hasegawa, J. Hirschauer, Z. Hu, B. Jayatilaka, S. Jindariani, M. Johnson, U. Joshi, B. Klima, M. J. Kortelainen, B. Kreis, S. Lammel, D. Lincoln, R. Lipton, M. Liu, T. Liu, J. Lykken, K. Maeshima, J. M. Marraffino, D. Mason, P. McBride, P. Merkel, S. Mrenna, S. Nahn, V. O’Dell, K. Pedro, C. Pena, O. Prokofyev, G. Rakness, L. Ristori, A. Savoy-Navarro, B. Schneider, E. Sexton-Kennedy, A. Soha, W. J. Spalding, L. Spiegel, S. Stoynev, J. Strait, N. Strobbe, L. Taylor, S. Tkaczyk, N. V. Tran, L. Uplegger, E. W. Vaandering, C. Vernieri, M. Verzocchi, R. Vidal, M. Wang, H. A. Weber, A. Whitbeck, D. Acosta, P. Avery, P. Bortignon, D. Bourilkov, A. Brinkerhoff, L. Cadamuro, A. Carnes, M. Carver, D. Curry, R. D. Field, S. V. Gleyzer, B. M. Joshi, J. Konigsberg, A. Korytov, K. H. Lo, P. Ma, K. Matchev, H. Mei, G. Mitselmakher, D. Rosenzweig, K. Shi, D. Sperka, J. Wang, X. Zuo, Y. R. Joshi, S. Linn, A. Ackert, T. Adams, A. Askew, S. Hagopian, V. Hagopian, K. F. Johnson, T. Kolberg, G. Martinez, T. Perry, H. Prosper, A. Saha, C. Schiber, R. Yohay, M. M. Baarmand, V. Bhopatkar, S. Colafranceschi, M. Hohlmann, D. Noonan, M. Rahmani, T. Roy, F. Yumiceva, M. R. Adams, L. Apanasevich, D. Berry, R. R. Betts, R. Cavanaugh, X. Chen, S. Dittmer, O. Evdokimov, C. E. Gerber, D. A. Hangal, D. J. Hofman, K. Jung, J. Kamin, C. Mills, I. D. Sandoval Gonzalez, M. B. Tonjes, H. Trauger, N. Varelas, H. Wang, X. Wang, Z. Wu, J. Zhang, M. Alhusseini, B. Bilki, W. Clarida, K. Dilsiz, S. Durgut, R. P. Gandrajula, M. Haytmyradov, V. Khristenko, J.-P. Merlo, A. Mestvirishvili, A. Moeller, J. Nachtman, H. Ogul, Y. Onel, F. Ozok, A. Penzo, C. Snyder, E. Tiras, J. Wetzel, B. Blumenfeld, A. Cocoros, N. Eminizer, D. Fehling, L. Feng, A. V. Gritsan, W. T. Hung, P. Maksimovic, J. Roskes, U. Sarica, M. Swartz, M. Xiao, C. You, A. Al-bataineh, P. Baringer, A. Bean, S. Boren, J. Bowen, A. Bylinkin, J. Castle, S. Khalil, A. Kropivnitskaya, D. Majumder, W. Mcbrayer, M. Murray, C. Rogan, S. Sanders, E. Schmitz, J. D. Tapia Takaki, S. Duric, A. Ivanov, K. Kaadze, D. Kim, Y. Maravin, D. R. Mendis, T. Mitchell, A. Modak, A. Mohammadi, L. K. Saini, N. Skhirtladze, F. Rebassoo, D. Wright, A. Baden, O. Baron, A. Belloni, S. C. Eno, Y. Feng, C. Ferraioli, N. J. Hadley, S. Jabeen, G. Y. Jeng, R. G. Kellogg, J. Kunkle, A. C. Mignerey, S. Nabili, F. Ricci-Tam, Y. H. Shin, A. Skuja, S. C. Tonwar, K. Wong, D. Abercrombie, B. Allen, V. Azzolini, A. Baty, G. Bauer, R. Bi, S. Brandt, W. Busza, I. A. Cali, M. D’Alfonso, Z. Demiragli, G. Gomez Ceballos, M. Goncharov, P. Harris, D. Hsu, M. Hu, Y. Iiyama, G. M. Innocenti, M. Klute, D. Kovalskyi, Y.-J. Lee, P. D. Luckey, B. Maier, A. C. Marini, C. Mcginn, C. Mironov, S. Narayanan, X. Niu, C. Paus, C. Roland, G. Roland, G. S. F. Stephans, K. Sumorok, K. Tatar, D. Velicanu, T. W. Wang, B. Wyslouch, S. Zhaozhong, A. C. Benvenuti, R. M. Chatterjee, A. Evans, P. Hansen, J. Hiltbrand, Sh. Jain, S. Kalafut, Y. Kubota, Z. Lesko, J. Mans, N. Ruckstuhl, R. Rusack, M. A. Wadud, J. G. Acosta, S. Oliveros, E. Avdeeva, K. Bloom, D. R. Claes, C. Fangmeier, F. Golf, R. Gonzalez Suarez, R. Kamalieddin, I. Kravchenko, J. Monroy, J. E. Siado, G. R. Snow, B. Stieger, A. Godshalk, C. Harrington, I. Iashvili, A. Kharchilava, C. Mclean, D. Nguyen, A. Parker, S. Rappoccio, B. Roozbahani, G. Alverson, E. Barberis, C. Freer, Y. Haddad, A. Hortiangtham, D. M. Morse, T. Orimoto, R. Teixeira De Lima, T. Wamorkar, B. Wang, A. Wisecarver, D. Wood, O. Charaf, K. A. Hahn, N. Mucia, N. Odell, M. H. Schmitt, K. Sung, M. Trovato, M. Velasco, R. Bucci, N. Dev, M. Hildreth, K. Hurtado Anampa, C. Jessop, D. J. Karmgard, N. Kellams, K. Lannon, W. Li, N. Loukas, N. Marinelli, F. Meng, C. Mueller, Y. Musienko, M. Planer, A. Reinsvold, R. Ruchti, P. Siddireddy, G. Smith, S. Taroni, M. Wayne, A. Wightman, M. Wolf, A. Woodard, J. Alimena, L. Antonelli, B. Bylsma, L. S. Durkin, S. Flowers, B. Francis, A. Hart, C. Hill, W. Ji, T. Y. Ling, W. Luo, B. L. Winer, S. Cooperstein, P. Elmer, J. Hardenbrook, S. Higginbotham, A. Kalogeropoulos, D. Lange, M. T. Lucchini, J. Luo, D. Marlow, K. Mei, I. Ojalvo, J. Olsen, C. Palmer, P. Piroué, J. Salfeld-Nebgen, D. Stickland, C. Tully, S. Norberg, A. Barker, V. E. Barnes, S. Das, L. Gutay, M. Jones, A. W. Jung, A. Khatiwada, B. Mahakud, D. H. Miller, N. Neumeister, C. C. Peng, S. Piperov, H. Qiu, J. F. Schulte, J. Sun, F. Wang, R. Xiao, W. Xie, T. Cheng, J. Dolen, N. Parashar, Z. Chen, K. M. Ecklund, S. Freed, F. J. M. Geurts, M. Kilpatrick, B. P. Padley, R. Redjimi, J. Roberts, J. Rorie, W. Shi, Z. Tu, J. Zabel, A. Zhang, A. Bodek, P. de Barbaro, R. Demina, Y. t. Duh, J. L. Dulemba, C. Fallon, T. Ferbel, M. Galanti, A. Garcia-Bellido, J. Han, O. Hindrichs, A. Khukhunaishvili, P. Tan, R. Taus, A. Agapitos, J. P. Chou, Y. Gershtein, E. Halkiadakis, M. Heindl, E. Hughes, S. Kaplan, R. Kunnawalkam Elayavalli, S. Kyriacou, A. Lath, R. Montalvo, K. Nash, M. Osherson, H. Saka, S. Salur, S. Schnetzer, D. Sheffield, S. Somalwar, R. Stone, S. Thomas, P. Thomassen, M. Walker, A. G. Delannoy, J. Heideman, G. Riley, S. Spanier, O. Bouhali, A. Celik, M. Dalchenko, M. De Mattia, A. Delgado, S. Dildick, R. Eusebi, J. Gilmore, T. Huang, T. Kamon, S. Luo, R. Mueller, D. Overton, L. Perniè, D. Rathjens, A. Safonov, N. Akchurin, J. Damgov, F. De Guio, P. R. Dudero, S. Kunori, K. Lamichhane, T. Mengke, S. Muthumuni, T. Peltola, S. Undleeb, I. Volobouev, S. Greene, A. Gurrola, R. Janjam, W. Johns, C. Maguire, A. Melo, H. Ni, K. Padeken, J. D. Ruiz Alvarez, P. Sheldon, S. Tuo, J. Velkovska, M. Verweij, Q. Xu, M. W. Arenton, P. Barria, B. Cox, R. Hirosky, M. Joyce, A. Ledovskoy, H. Li, C. Neu, T. Sinthuprasith, E. Wolfe, F. Xia, R. Harr, P. E. Karchin, N. Poudyal, J. Sturdy, P. Thapa, S. Zaleski, M. Brodski, J. Buchanan, C. Caillol, D. Carlsmith, S. Dasu, L. Dodd, B. Gomber, M. Grothe, M. Herndon, A. Hervé, U. Hussain, P. Klabbers, A. Lanaro, K. Long, R. Loveless, T. Ruggles, A. Savin, N. Smith, W. H. Smith, N. Woods, and CMS Collaboration

Subjects
CMS, Physics, b hadrons, Heavy flavour spectroscopy, Hadron spectroscopy, Experimental results, Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Measurements of $${\mathrm {B}} ^{*}_{{\mathrm {s}}2}(5840)^0 $$ Bs2∗(5840)0 and $${\mathrm {B}} _{{\mathrm {s}}1}(5830)^0 $$ Bs1(5830)0 mesons are performed using a data sample of proton-proton collisions corresponding to an integrated luminosity of , collected with the CMS detector at the LHC at a centre-of-mass energy of $$8\,\text {TeV} $$ 8TeV . The analysis studies P-wave $${\mathrm {B}} ^0_{\mathrm {s}} $$ Bs0 meson decays into $${\mathrm {B}} ^{(*)+} \mathrm {K} ^- $$ B(∗)+K- and $${\mathrm {B}} ^{(*)0} \mathrm {K} ^0_{\mathrm {S}} $$ B(∗)0KS0 , where the $${\mathrm {B}} ^+ $$ B+ and $${\mathrm {B}} ^0 $$ B0 mesons are identified using the decays $${\mathrm {B}} ^+ \rightarrow {\mathrm {J}}/\psi \mathrm {K} ^+ $$ B+→J/ψK+ and $${\mathrm {B}} ^0 \rightarrow {\mathrm {J}}/\psi \mathrm {K} ^{*}(892)^0 $$ B0→J/ψK∗(892)0 . The masses of the P-wave $${\mathrm {B}} ^0_{\mathrm {s}} $$ Bs0 meson states are measured and the natural width of the $${\mathrm {B}} ^{*}_{{\mathrm {s}}2}(5840)^0 $$ Bs2∗(5840)0 state is determined. The first measurement of the mass difference between the charged and neutral $${\mathrm {B}} ^{*} $$ B∗ mesons is also presented. The $${\mathrm {B}} ^{*}_{{\mathrm {s}}2}(5840)^0 $$ Bs2∗(5840)0 decay to $${\mathrm {B}} ^0 \mathrm {K} ^0_{\mathrm {S}} $$ B0KS0 is observed, together with a measurement of its branching fraction relative to the $${\mathrm {B}} ^{*}_{{\mathrm {s}}2}(5840)^0 \rightarrow {\mathrm {B}} ^+ \mathrm {K} ^- $$ Bs2∗(5840)0→B+K- decay.

Published
2018
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22. Recent results on hadronic spectroscopy at LHCb.

Author

Denig, A., Redmer, C.-F., and Needham, Matthew

Subjects
*HADRON spectroscopy, *LARGE Hadron Collider, *FLAVOR in particle physics, *CHARMONIUM, *BARYONS
Abstract

The LHCb experiment is optimized to make precision measurements in the flavour sector. The large datasets collected between 2010 and 2016 allow to study the properties of heavy hadrons with unprecedented precision. In these proceedings recent results related to three topics are discussed: studies of charmonium production and properties using inclusive b → φφX decays, the observation of charmed pentaquarks and exotic mesons, and the observation of five new excited Ωc baryons. [ABSTRACT FROM AUTHOR]

Published
2019
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23. The Belle II Experiment at the SuperKEKB.

Author

Denig, A., Redmer, C.-F., and Yuan, Chang-Zheng

Subjects
*MESON factories, *PHYSICS experiments, *STANDARD model (Nuclear physics), *COLLIDERS (Nuclear physics), *HADRON spectroscopy
Abstract

Belle II experiment at the SuperKEKB collider is a major upgrade of the Belle experiment at the KEKB asymmetric e+e− collider at the KEK. The experiment will focus on the search for new physics beyond the standard model via high precision measurement of heavy flavor decays and search for rare signals. In this talk, we present the status of the SuperKEKB collider and the Belle II detector. [ABSTRACT FROM AUTHOR]

Published
2019
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24. The XYZ mesons: what they aren't.

Author

Bondar, A., Eidelman, S., and Olsen, Stephen Lars

Subjects
*MESONS, *HEAVY particles (Nuclear physics), *NUCLEAR models, *HADRON spectroscopy, *CHARMONIUM, *QUARKONIUMS
Abstract

I discuss the properties of some representative XYZ mesons in the context of the most commonly proposed models for their underlying nature. [ABSTRACT FROM AUTHOR]

Published
2019
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25. PyPWA: A software toolkit for parameter optimization and amplitude analysis.

Author

Jones, Mark, Hurck, Peter, Phelps, William, and Salgado, Carlos W.

Subjects
*WAVE analysis, *NUCLEAR physics, *SOFTWARE architecture, *DESIGN software, *COMPUTER software, *PYTHON programming language
Abstract

PyPWA is a toolkit designed to optimize parametric models describing data and generate simulated distributions according to a model. Its software has been written within the python ecosystem with the goal of performing Amplitude or Partial Wave Analysis (PWA) in nuclear and particle physics experiments. We briefly describe the general features of amplitude analysis and we provide a description of the PyPWA software design and usage. We also provide benchmarks of the scaling and an example of its application. [ABSTRACT FROM AUTHOR]

Published
2024
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26. DK and BK-like spectra from Laplace sum rule at NLO

Author

Narison, S., Rabemananjara, A., Rabetiarivony, D., Laboratoire Univers et Particules de Montpellier (LUPM), and Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Montpellier 2 - Sciences et Techniques (UM2)

Subjects
Nuclear and High Energy Physics, hadron spectroscopy, hadron: exotic, FOS: Physical sciences, B: decay, tetraquark, stability, LHC-B, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), sum rule: spectral, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], excited state, quantum chromodynamics, spin: 1, charm, sum rule: Laplace
Abstract

Encouraged by the agreement, with the recent LHCb data on the $D^-K^+$ invariant mass from $B \rightarrow D^+D^-K^+$ decay, of our results for the masses of the $0^+$ and $1^-$ open charm $(\bar c\bar d)(u s)$ tetraquarks and molecules states from QCD spectral sum rules within stability criteria, which we review here, we extend our analysis to the $b$-quark channel. We find, in the $0^+$ case the lowest mass $M_{BK}=5195(15)~{\rm MeV}$ with $f_{BK}=8.3(2.4)~{\rm keV}$ and three (almost) degenerate states having respectively the masses $M_{SS}=5702(60)~{\rm MeV}$, $M_{AA}=5661(75)~{\rm MeV}$ and $M_{B^*K^*}=5720(71)~{\rm MeV}$ and couplings $f_{SS}=22.2(2.3)~{\rm keV}$, $f_{AA}=30.1(3.1)~{\rm keV}$ and $f_{B^*K^*}=26.5(2.8)~{\rm keV}$, from which we can associate a scalar tetramole with $M_{\mathcal T_{\mathcal M_0}}=5694(69)~{\rm MeV}~\text{and} ~ f_{\mathcal T_{\mathcal M_0}}=26.5(2.7)~{\rm keV}$. In the spin 1 case, we find four (almost) degenerate states associated with a tetramole having $M_{\mathcal T_{\mathcal M_1}}=5700(81)~{\rm MeV}~\text{and} ~ f_{\mathcal T_{\mathcal M_1}}=16.2(2.6)~{\rm keV}$. For the first radial excitation of the $BK$ molecule, we have $M_{(BK)_1} = 6265(146) ~{\rm MeV}$ and $f_{(BK)_1} = 22.8(3.2) ~{\rm keV}$ . For the remaining states, we associate a scalar and vector tetramoles having respectively $M_{\mathcal (T_{\mathcal M_0})_1}=7439(314)~{\rm MeV}, ~ f_{\mathcal (T_{\mathcal M_0})_1}=74.7(8.4)~{\rm keV}$ and $M_{\mathcal (T_{\mathcal M_1})_1}=7544(345)~{\rm MeV}, ~ f_{\mathcal (T_{\mathcal M_1})_1}=33.0(6.7)~{\rm keV}$., arXiv admin note: text overlap with arXiv:2008.13463

Published
2022
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28. Search for hidden-charm tetraquark with strangeness in e(+) e(-) -> K+ D-s(*-) D-*0 +c.c. (*)

Author

Ablikim, M., Adlarson, Patrik, Johansson, Tord, Kupsc, Andrzej, Schönning, Karin, Thorén, Viktor, Wolke, Magnus, Zu, J., Ablikim, M., Adlarson, Patrik, Johansson, Tord, Kupsc, Andrzej, Schönning, Karin, Thorén, Viktor, Wolke, Magnus, and Zu, J.

Abstract

We report a search for a heavier partner of the recently observed Z(cs) (3985)(-) state, denoted as Z '(-)(cs), in the process e(+)e(-) -> K+Ds*- D(*0+)c.c., based on e(+)e(-)collision data collected at the center-of-mass energies of root s =4.661,4.682 and 4.699 GeV with the BESIII detector. The Z '(-)(cs) is of interest as it is expected to be a candidate for a hidden-charm and open-strange tetraquark. A partial-reconstruction technique is used to isolate recoil-mass spectra, which are probed for a potential contribution from Z '(-)(cs) -> D-s(*-) D-*0 (c.c). We find an excess of Z '(-)(cs) -> D-s(*-) D-*0 (c.c) candidates with a significance of 2.1 sigma after considering systematic uncertainties, at a mass of(4.123.5 +/- 0.7(stat.) +/- 4.7(syst.) ) MeV/c(2.) As the data set is limited in size, the upper limits are evaluated at the 90% confidence level on the product of the Born cross sections (sigma(Born)) and the branching fraction (B) of Z '(-)(cs) -> D-s(*-) D-*0 under different assumptions of the Z '(-)(cs) mass from 4.120 to 4.140 MeV and of the width from 10 to 50 MeV at the three center-of-mass energies. The upper limits of sigma(Born) are found to be at the level of O(1) pb at each energy. Larger data samples are needed to confirm Z '(-)(cs) the state and clarify its nature in the coming years., For complete list of authors see http://dx.doi.org/10.1088/1674-1137/acac69

Published
2023
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29. Light hadron spectroscopy at BESIII.

Author

Wrońska, A., Magiera, A., Przygoda, W., and Xiong, Xian

Subjects
*HADRON spectroscopy, *NUCLEAR spectroscopy, *PARTICLE physics, *SPIN excitations, *NUCLEAR excitation
Abstract

Light hadron spectroscopy is one of the most important physics goals of high statistics of charmonium decays collected at BESIII which provide an excellent place for hunting gluonic excitations and studying strangeonium. In this proceeding, we will introduce two analyses for gluonic states study on η(1405)/η(1475) puzzle, X(1835) and exotic states and two analyses for strangeonium(like) states study on Y(2175) and Zs state. [ABSTRACT FROM AUTHOR]

Published
2019
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30. Heavy-hadron interactions from Lattice QCD.

Author

Bühler, P. and Mohler, Daniel

Subjects
*HADRON interactions, *QUANTUM chromodynamics, *HADRON spectroscopy, *LATTICE networks, *BARYONS, *MESONS
Abstract

I review recent progress in heavy hadron spectroscopy and from ab-initio Lattice QCD calculations.After motivating lattice calculations for heavy-hadrons by contrasting recent LHCb results charmed and doubly-charmed baryons with lattice predictions, selected resultsfrom scattering calculations for heavy-light mesons and for charmonia are presented.I close with a discussion of recent Lattice QCD predictions of explicitlyexotic doubly-heavy states. [ABSTRACT FROM AUTHOR]

Published
2018
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31. Hadron spectroscopy in LHCb.

Author

Bühler, P. and Palano, Antimo

Subjects
*HADRON spectroscopy, *LARGE Hadron Collider, *QUARK decay, *HEAVY quark effective theory, *BARYONS
Abstract

The LHCb experiment is designed to study the properties and decays of heavy flavored hadrons produced in pp collisions at the LHC. The data collected in the LHC Run I enables precision spectroscopy studies of beauty and charm hadrons. The latest results on spectroscopy of conventional and exotic hadrons are reviewed. In particular the discovery of the first charmonium pentaquark states in the J/Ψp system, the possible existence of four-quark states decaying to J/ΨΦ and the confirmation of resonant nature of the Zc(4430)− mesonic state are discussed. In the sector of charmed baryons, the observation of five new Ωc states, the observation of the Ξcc+ and the study of charmed baryons decaying to D0p are presented. [ABSTRACT FROM AUTHOR]

Published
2018
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32. P¯ANDA Muon System Prototype.

Author

Abazov, Victor, Alexeev, Gennady, Alexeev, Maxim, Frolov, Vladimir, Golovanov, Georgy, Kutuzov, Sergey, Piskun, Alexei, Samartsev, Alexander, Tokmenin, Valeri, Verkheev, Alexander, Vertogradov, Leonid, and Zhuravlev, Nikolai

Subjects
*ANTIPROTONS, *MUONS, *PROTON synchrotrons, *HADRON spectroscopy, *HYPERFRAGMENTS
Abstract

The P¯ANDA Experiment will be one of the key experiments at the Facility for Antiproton and Ion Research (FAIR) which is under construction now in the territory of the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany. P¯ANDA is aimed to study hadron spectroscopy and various topics of the weak and strong forces. Muon System is chosen as the most suitable technology for detecting the muons. The Prototype of the P¯ANDA Muon System is installed on the test beam line T9 at the Proton Synchrotron (PS) at CERN. Status of the P¯ANDA Muon System prototype is presented with few preliminary results. [ABSTRACT FROM AUTHOR]

Published
2018
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33. Open charm hadron spectroscopy at B-factories.

Author

Kato, Y. and Iijima, T.

Subjects
*MESONS, *HADRONS, *SPECTROMETRY
Abstract

Abstract Open charm hadrons are excellent probes to study the dynamics of quarks and gluons inside hadrons. Because the mass of a charm quark is heavier than Λ Q C D , so called heavy quark symmetry emerges in the hadron containing a charm quark and plays a central role in the classification and constraining the interactions. Belle and BaBar, which are B-factory experiments, have made significant advances in the field of open charm hadron spectroscopy in these 15 years. In this article, experimental advances on both open charm mesons and baryons by B-factory experiments are reviewed. Finally, the prospect of the open charm hadrons with the next generation B-factory experiment, Belle II is described. [ABSTRACT FROM AUTHOR]

Published
2019
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34. The Effect of Higher Dimensional QCD Operators on the Spectroscopy of Bottom-Up Holographic Models

Author

Sergey Afonin

Subjects
holographic approach, AdS/QCD, hadron spectroscopy, Elementary particle physics, QC793-793.5
Abstract

Within the bottom-up holographic approach to QCD, the highly excited hadrons are identified with the bulk normal modes in the fifth “holographic” dimension. We show that additional states in the same mass range can appear also from taking into consideration the 5D fields dual to higher dimensional QCD operators. The possible effects of these operators have not been taken into account in virtually any phenomenological applications. Using the scalar case as the simplest example, we demonstrate that the additional higher dimensional operators lead to a large degeneracy of highly excited states in the soft wall holographic model, and in the hard wall holographic model, they result in a proliferation of excited states. The considered model can be viewed as the first analytical toy model predicting a one-to-one mapping of the excited meson states to definite QCD operators, to which they prefer to couple.

Published
2021
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35. Analysis of pp → ππ data at low energy and its implications

Author

Oakden, Mark Norman

Subjects
539.72, Hadron spectroscopy
Abstract

This thesis is a study of data on pp → ππ in the range 0.36 ≤ P(_lab) ≤ 1.55 GeV/c taken by the PS 172 experiment at CERN's LEAR facility. The aim is to elucidate the nature of mesonic states coupling both to baryon-antibaryon and meson-meson channels. The PS 172 data are compared with, and found to be consistent with, earlier data on the same channel, and, in a model independent way, the consistency of the PS 172 results with BNL data on pp pp → π(^0)π(^0) is also established. The first amplitude analysis of pp → π(^0)π(^0) to incorporate the PS 172 data is performed and it is found that from the hundreds of possible amplitudes, only two are compatible with the BNL pp → π(^0)π(^0) data and with threshold conditions. The latter may be applied in a far more rigorous way than has been previously possible since the PS 172 momentum range extends so close to threshold. Both of the solutions found exhibit resonances with spins 0-5 and the masses, widths and couplings of these states are deduced. The lowest spin resonances are found to have such large couplings to NN that they are unlikely to be simple qq states.

Published
1994

37. K-p One-Hadron-Exchange Potential Model.

Author

Trisnayadi, K., Salam, A., and Fachruddin, I.

Subjects
*KAON scattering, *HADRON interactions, *HADRON spectroscopy, *MATHEMATICAL constants, *THREE-dimensional display systems
Abstract

We present a model of K-p one-hadron-exchange potential. The hadrons being exchanged include σ, ρ, ω, Λ and Σ. The potential's parameters are determined by fitting to experimental data of K-p scattering, which are the spin-averaged differential cross sections. The energies being considered are between 51 MeV and 884 MeV. We calculate K-p scattering on a three-dimensional basis. The set of fitted parameters consists of cut-off parameters for the hadron form factors, σ mass, and coupling constants [ABSTRACT FROM AUTHOR]

Published
2017
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38. Hadron Spectroscopy in Double Pomeron Exchange Experiments.

Author

Albrow, Michael G.

Subjects
*HADRON spectroscopy, *HADRON-hadron scattering, *COLLISIONS (Nuclear physics), *QUANTUM numbers, *POMERONS
Abstract

Central exclusive production in hadron-hadron collisions at high energies, for example p+ p→ p+X + p, where the + represents a large rapidity gap, is a valuable process for spectroscopy of mesonic states X. At collider energies the gaps can be large enough to be dominated by pomeron exchange, and then the quantum numbers of the state X are restricted. Isoscalar JPC = 0++ and 2++ mesons are selected, and our understanding of these spectra is incomplete. In particular, soft pomeron exchanges favor gluon-dominated states such as glueballs, which are expected in QCD but not yet well established. I will review some published data. [ABSTRACT FROM AUTHOR]

Published
2017
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39. The non-perturbative unquenched quark model.

Author

Entem, D. R., Ortega, P. G., and Fernández, F.

Subjects
*QUARK models, *QUARKONIUMS, *MESON-meson interactions, *HADRON spectroscopy, *CHARMONIUM
Abstract

In recent years states in the quarkonium spectrum not expected in the naive quark model have appeared and created a lot of interest. In the theoretical side the study of the effect of meson-meson thresholds in the spectrum have been performed in different approximations. In a quark model framework, and in the spirit of the Cornell model, when a meson-meson threshold is included, the coupling to all the quark-antiquark states have to be considered. In practice only the closest states are included perturbatively. In this contribution we will present a framework in which we couple quark-antiquark states with meson-meson states non-perturbatively, taking into account effectively the coupling to all quark-antiquark states. The method will be applied to the study of the X(3872) and a comparison with the perturbative calculation will be performed. [ABSTRACT FROM AUTHOR]

Published
2017
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40. Predicting positive parity Bs mesons from lattice QCD

Author

C.B. Lang, Daniel Mohler, Sasa Prelovsek, and R.M. Woloshyn

Subjects
Hadron spectroscopy, Lattice QCD, Bottom-strange mesons, Physics, QC1-999
Abstract

We determine the spectrum of Bs 1P states using lattice QCD. For the Bs1(5830) and Bs2⁎(5840) mesons, the results are in good agreement with the experimental values. Two further mesons are expected in the quantum channels JP=0+ and 1+ near the BK and B⁎K thresholds. A combination of quark–antiquark and B(⁎) meson–Kaon interpolating fields are used to determine the mass of two QCD bound states below the B(⁎)K threshold, with the assumption that mixing with Bs(⁎)η and isospin-violating decays to Bs(⁎)π are negligible. We predict a JP=0+ bound state Bs0 with mass mBs0=5.711(13)(19) GeV. With further assumptions motivated theoretically by the heavy quark limit, a bound state with mBs1=5.750(17)(19) GeV is predicted in the JP=1+ channel. The results from our first principles calculation are compared to previous model-based estimates.

Published
2015
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41. Jefferson Lab at 12 GeV: The Science Program.

Author

Burkert, Volker D.

Abstract

Jefferson Lab's upgrade of its Continuous Electron Beam Accelerator Facility (CEBAF) has recently been completed. The project involved an upgrade of the accelerator to achieve a maximum beam energy of 12 GeV and the construction of a fourth end station, Experimental Hall D, as well as new detector equipment for two of the three existing halls (A, B, and C). A broad experimental program has been developed to map the nucleon's intrinsic quark distributions in transverse space and in longitudinal momentum through measurements of deeply exclusive and semi-inclusive processes, and to probe color confinement by studying the spectrum of hadrons with active gluon degrees of freedom in the wave function. Other programs include the forward parton distribution function at large quark momentum fraction x, the quark and gluon polarized distribution functions, measurements of electromagnetic form factors of the nucleon ground state and of nucleon resonance transitions at short distances, and the exploration of physics beyond the Standard Model in high-precision parity-violating processes and in the search for signals of dark matter. The higher beam energy is also suitable for exploration of quark hadronization properties using the nucleus as a laboratory. This review highlights major areas of hadron and nuclear science that will be the focus of the first 5 years of operation. [ABSTRACT FROM AUTHOR]

Published
2018
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42. Multiquark States.

Author

Karliner, Marek, Rosner, Jonathan L., and Skwarnicki, Tomasz

Abstract

Why do we see certain types of strongly interacting elementary particles and not others? This question was posed more than 50 years ago in the context of the quark model. M. Gell-Mann and G. Zweig proposed that the known mesons were and baryons qqq, with the quarks known at the time, u (up), d (down), and s (strange), having charges of 2/3, −1/3, and −1/3, respectively. Mesons and baryons would then have integral charges. Mesons such as and baryons such as would also have integral charges. Why weren't they seen? They have now been seen, but only with additional heavy quarks and under conditions that tell us a lot about the strong interactions and how they manifest themselves. This review describes recent progress in our understanding of such exotic mesons and baryons. [ABSTRACT FROM AUTHOR]

Published
2018
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43. The <italic>XYZ</italic> states revisited.

Author

Yuan, Chang-Zheng

Subjects
*PHYSICS experiments, *ANNIHILATION reactions, *CENTER of mass, *CHARMONIUM, *QUARKS
Abstract

The BESIII and the LHCb became the leading experiments in the study of the exotic states after the Belle and BaBar experiments finished their data taking in the first decade of this century. We review the progress in the study of the XYZ states at BESIII and LHCb experiments with their unique data samples in e + e − annihilation at center-of-mass energies of 3.8–4.6 GeV and in p p collision at center-of-mass energies 7, 8, and 13 TeV, respectively. With these data samples, we have deepened our understanding of the most famous charmonium-like states X ( 3 8 7 2 ) , Y ( 4 2 6 0 ) , Z c ( 3 9 0 0 ) , and Z c ( 4 4 3 0 ) , as well as other similar states like the Y ( 4 1 4 0 ) and X ( 3 8 2 3 ). We review the progress in the study of these states and also discuss perspectives at future experiments. [ABSTRACT FROM AUTHOR]

Published
2018
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44. Color Confinement, Hadron Dynamics, and Hadron Spectroscopy from Light-Front Holography and Superconformal Algebra.

Author

Brodsky, Stanley J.

Subjects
*HAMILTON'S equations, *QUANTIZATION (Physics), *QUANTUM theory, *HADRON spectroscopy, *ALGEBRA, *HOLOGRAPHY
Abstract

The QCD light-front Hamiltonian equation HLFΨ=M2Ψ derived from quantization at fixed LF time τ=t  +  z/c provides a causal, frame-independent method for computing hadron spectroscopy as well as dynamical observables such as structure functions, transverse momentum distributions, and distribution amplitudes. The QCD Lagrangian with zero quark mass has no explicit mass scale. de Alfaro, Fubini, and Furlan (dAFF) have made an important observation that a mass scale can appear in the equations of motion without affecting the conformal invariance of the action if one adds a term to the Hamiltonian proportional to the dilatation operator or the special conformal operator. If one applies the dAFF procedure to the QCD light-front Hamiltonian, it leads to a color-confining potential κ4ζ2 for mesons, where ζ2 is the LF radial variable conjugate to the qq¯ invariant mass squared. The same result, including spin terms, is obtained using light-front holography, the duality between light-front dynamics and AdS5, if one modifies the AdS5 action by the dilaton eκ2z2 in the fifth dimension z. When one generalizes this procedure using superconformal algebra, the resulting light-front eigensolutions provide a unified Regge spectroscopy of meson, baryon, and tetraquarks, including remarkable supersymmetric relations between the masses of mesons and baryons and a universal Regge slope. The pion qq¯ eigenstate has zero mass at mq=0. The superconformal relations also can be extended to heavy-light quark mesons and baryons. This approach also leads to insights into the physics underlying hadronization at the amplitude level. I will also discuss the remarkable features of the Poincaré invariant, causal vacuum defined by light-front quantization and its impact on the interpretation of the cosmological constant. AdS/QCD also predicts the analytic form of the nonperturbative running coupling αs(Q2)∝e-Q2/4κ2. The mass scale κ underlying hadron masses can be connected to the parameter ΛMS¯ in the QCD running coupling by matching the nonperturbative dynamics to the perturbative QCD regime. The result is an effective coupling αs(Q2) defined at all momenta. One obtains empirically viable predictions for spacelike and timelike hadronic form factors, structure functions, distribution amplitudes, and transverse momentum distributions. Finally, I address the interesting question of whether the momentum sum rule is valid for nuclear structure functions. [ABSTRACT FROM AUTHOR]

Published
2018
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45. Recent results in conventional and exotic heavy hadron spectroscopy with CMS

Author

A. Pompili

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Hadron spectroscopy, Excited state, Detector, High Energy Physics::Experiment, Heavy ion, Nuclear Experiment
Abstract

Recents results in conventional and exotic heavy hadron spectroscopy with the CMS detector are presented. They include Λ**b and B(*)c (2S) excited states, the search for exotic states in ϒ(1S) μ+μ− final states, the first observation of the B0s → X(3872) ϕ decay mode and the evidence of X(3872) production in Heavy Ion collisions.

Published
2021
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47. Hadron spectroscopy from lattice quantum chromodynamics.

Author

Ryan, Sinéad M.

Subjects
*HADRON spectroscopy, *LATTICE quantum chromodynamics, *COMPUTER simulation, *EXOTIC atoms, *CHARMONIUM
Abstract

Lattice calculations of hadron spectroscopy are discussed. A brief introduction to numerical simulations of QCD, with a focus on spectroscopy is given. Results for spectroscopy of low-lying, excited and exotic states including hybrids and the X, Y, Z states in charmonium are described. New developments that have allowed for determinations of scattering parameters, including in a coupled-channel analysis are briefly described providing a roadmap for future lattice calculations of excited and exotic states. [ABSTRACT FROM AUTHOR]

Published
2016
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48. Production of hadron exotics in high energy processes.

Author

Wei Wang

Subjects
*HADRONS, *PARTICLES (Nuclear physics), *FIELD theory (Physics), *COLLISIONS (Physics), *HADRON spectroscopy, *QUARKONIUMS
Abstract

Production of hadron exotics in high energy processes may play a role in unravelling their nature. In high energy limit, the leading power behavior of the cross section of exclusive processes is usually encoded in the constituent counting rule. In this talk I will demonstrate for the process involving hadrons with hidden flavors the constituent counting rule requests modifications. I will use effective field theory to derive the power scalings. After the e+e-→VP example I will discuss the production of hadron exotics including the X(3872) and Z± c in high energy process. I will also briefly talk about the challenge of the molecular interpretation of X(3872) based on its large production rates in hadron collisions. [ABSTRACT FROM AUTHOR]

Published
2016
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49. Hadron spectroscopy and interactions from lattice QCD.

Author

Prelovsek, Sasa

Subjects
*HADRON interactions, *HADRON spectroscopy, *LATTICE theory, *QUANTUM chromodynamics, *NEUTRON resonance, *RADIOACTIVE decay
Abstract

Lattice QCD approach to study the hadronic resonances and exotic hadrons is described at an introductory level. The main challenge is that these states decay strongly via one or more decay channels, and they often lie near thersholds. Specific results for conventional and exotic hadrons are shown to illustrate the current status. [ABSTRACT FROM AUTHOR]

Published
2016
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50. Hadron Spectroscopy at BESIII.

Author

Destefanis, Marco

Subjects
*HADRON spectroscopy, *CHARMONIUM, *QUANTUM chromodynamics, *RADIOACTIVE decay, *PARTICLES (Nuclear physics), *HYPERONS
Abstract

The BESIII experiment, hosted at the IHEP of Beijing, has collected the world largest data sample in the charmonium energy region. One of the most important physics goals of BESIII is the investigation of the QCD prediction. QCD can be accessed in a unique way by means of hadron spectroscopy, which was extensively studied and many important progresses were achieved in the last years. Charmonium decays provide an excellent scenario for studying nucleons, hyperons and their excited states, XYZ resonances, as well as light hadrons. Some of the most recent results for hadron spectroscopy from BESIII will be reported. [ABSTRACT FROM AUTHOR]

Published
2016
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