Tue·Jan 16, 2018Tuesday·January 16, 2018

1. 01*

   The bottomed strange molecules with isospin 0

   Zhi-Feng Sun🇨🇳 · Ju-Jun Xie🇨🇳 · E. Oset🇪🇸

   Using the local hidden gauge approach, we study the possibility of the existence of bottomed strange molecular states with isospin 0. We find three bound states with spin-parity $0^{+}$, $1^{+}$ and $2^{+}$ generated by the ${\bar{K}}^{\ast }{B}^{\ast }$ and $\omega B_s^{\ast }$ interaction, among which the state with spin 2 can be identified as $B_{s2}^{\ast }(5840)$. In addition, we also study the ${\bar{K}}^{\ast }B$ and $\omega B_s$ interaction and find a bound state which can be associated to $B_{s1}(5830)$. Besides, the $\bar{K}{B}^{\ast }$ and $\eta B_s^{\ast }$ and $\bar{K}B$ and $\eta B_s$ systems are studied, and two bound states are predicted. We expect that further experiments can confirm our predictions.

   hep-phhep-exPRD(2018)·11 citations
2. 02*

   Transport coefficients in the Polyakov quark meson coupling model: A quasi particle approach

   Aman Abhishek🇮🇳 · Sabyasachi Ghosh🇮🇳 · Hiranmaya Mishra🇮🇳

   We compute the transport coefficients, namely, the coefficients of shear and bulk viscosities as well as thermal conductivity for hot and dense matter. The calculations are performed within the Polyakov loop extended quark meson model. The estimation of the transport coefficients is made using the Boltzmann kinetic equation within the relaxation time approximation. The energy dependent relaxation time is estimated from meson meson scattering, quark meson scattering and quark quark scattering within the model. In our calculations, the shear viscosity to entropy ratio and the coefficient of thermal conductivity show a minimum at the critical temperature, while the ratio of bulk viscosity to entropy density exhibits a peak at this transition point. The effect of confinement modelled through a Polyakov loop potential plays an important role in the estimation of these dissipative coefficients both below and above the critical temperature.

   hep-phnucl-thPoS(2018)·1 citation
3. 03*

   Recent developments from the loop-tree duality

   German Rodrigo🇪🇸 · Felix Driencourt-Mangin🇪🇸 · German F. R. Sborlini🇮🇹 · Roger J. Hernandez-Pinto🇲🇽

   In this talk, we review the most recent developments of the four-dimensional unsubstraction (FDU) and loop-tree duality (LTD) methods. In particular, we make emphasis on the advantages of the LTD formalism regarding asymptotic expansions of loop integrands.

   hep-phPoS(2018)·2 citations
4. 04*

   Analytical approaches to the determination of spin-dependent parton distribution functions at NNLO approximation

   Maral Salajegheh · S.Mohammad Moosavi Nejad · Hamzeh Khanpour · S. Atashbar Tehrani

   In this paper, we present {\tt SMKA18} analysis which is a first attempt to extract the set of next-to-next-leading-order (NNLO) spin-dependent parton distribution functions (spin-dependent PDFs) and their uncertainties determined through the Laplace transform technique and Jacobi polynomial approach. Using the Laplace transformations, we present an analytical solution for the spin-dependent Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution equations at NNLO approximation. The results are extracted using a wide range of proton $g_1^p(x,Q^2)$, neutron $g_1^n(x,Q^2)$ and deuteron $g_1^d(x,Q^2)$ spin-dependent structure functions dataset including the most recent high-precision measurements from {\tt COMPASS16} experiments at CERN which are playing an increasingly important role in global spin-dependent fits. The careful estimations of uncertainties have been done using the standard 'Hessian error' propagation. We will compare our results with the available spin-dependent inclusive deep inelastic scattering dataset and other results for the spin-dependent PDFs in literature. The results obtained for the spin-dependent PDFs as well as spin-dependent structure functions are clearly explained both in the small and large values of $x$.

   hep-phPRC(2018)·32 citations
5. 05*

   Surveying exotic pentaquarks with the typical $QQqq\bar{q}$ configuration

   Qin-Song Zhou🇨🇳 · Kan Chen🇨🇳 · Xiang Liu🇨🇳 · Yan-Rui Liu🇨🇳 · Shi-Lin Zhu🇨🇳

   As a hot issue, exploring exotic pentaquarks is full of challenges and opportunities for both theorist and experimentalist. In this work, we focus on a type of pentaquark with the $QQqq\bar{q}$ ($Q=b,c$; $q=u,d,s$) configuration, where their mass spectrum is estimated systematically. Especially, our result indicates that there may exist some stable or narrow exotic pentaquark states. Obviously, our study may provides valuable information for further experimental search for the $QQqq\bar{q}$ pentaquarks. With the running of LHCb and forthcoming Belle II, we have a reason to believe that these predictions present here can be tested.

   hep-phhep-latnucl-thPRC(2018)·51 citations
6. 06*

   Dynamical Symmetry Breaking by SU(2) Gauge Bosons

   F. J. Himpsel🇺🇸

   This work explores the possibility of obtaining a mass gap in Yang-Mills theories via the intrinsic gauge bosons, without invoking a separate Higgs boson or fermion-antifermion pairs. Instead, pairs of gauge bosons in the spin and isospin singlet state form a pair of composite Higgs bosons which can be viewed as the simplest possible glueball of Yang-Mills gauge theories. Quadratic and quartic gauge boson self-interactions form a potential that leads to a finite expectation value of the gauge boson amplitude. Transverse polarization ensures Lorentz invariance of the vacuum after averaging over all possible polarization vectors. But the scalar pair products exhibit a finite vacuum expectation value which breaks the gauge symmetry dynamically. Compatibility with the standard Higgs potential determines the quadratic and quartic coupling constants.

   hep-ph1 citation
7. 07*

   On the form factors of $d^{\ast }(2380)$

   Yubing Dong🇨🇳 · Pengnian Shen🇨🇳 · Zongye Zhang🇨🇳

   In order to explore the possible physical quantities for judging different structures of the newly observed resonance $d^{\ast }(2380)$, we study its electromagnetic form factors. In addition to the electric charge monopole $C0$, we calculate its electric quadrupole $E2$, magnetic dipole $M1$, and six-pole $M3$ form factors on the base of the realistic coupled $\Delta \Delta +CC$ channel $d^{\ast }$ wave function with both the $S$- and $D$-partial waves. The results show that the magnetic dipole moment and electric quadrupole deformation of $d^{\ast }$ are 7.602 and $2.53\times 10^{-2}{\mathrm{fm}}^2$, respectively. The calculated magnetic dipole moment in the naive constituent quark model is also compared with the result of $D_{12}\pi$ picture. By comparing with partial results where the $d^{\ast }$ state is considered with a single $\Delta \Delta$ and with a $D_{12}\pi$ structures, we find that in addition to the charge distribution of $d^{\ast }(2380)$, the magnetic dipole moment and magnetic radius can be used to discriminate different structures of $d^{\ast }$. Moreover, a quite small electric quadrupole deformation indicates that $d^{\ast }$ is more inclined to an slightly oblate shape due to our compact hexaquark dominated structure of $d^{\ast }(2380)$.

   hep-phnucl-thPRD(2018)·19 citations
8. 08*

   Effective-field theories for charged lepton flavour violation

   Giovanni Marco Pruna🇮🇹

   These proceedings review the status of present and future bounds on muonic lepton flavour violating transitions in the context of an effective-field theory defined below the electroweak scale. A specific focus is set on the phenomenology of $\mu \to e\gamma$, $\mu \to 3e$ transitions and coherent $\mu \to e$ nuclear conversion in the light of current and future experiments. Once the experimental limits are recast into bounds at higher scales, it is shown that the interplay between the various experiments is crucial to cover all corners of the parameter space.

   hep-phEPJ Web Conf.(2018)·1 citation
9. 09*

   Fractional dynamics of fermion generations

   Yu.A. Simonov🇷🇺

   The dynamics of fermion generations is treated in the framework of the fractional Lagrangian and Hamiltonian in the compact extra dimension. The resulting spectra for u, d, e generations are described by the only mass parameter and slightly different fractional numbers, while the neutrino spectra need another mass parameter and a single fractional number for all neutrino species. New definitions of CKM and PMNS mixing matrices with standard data are given as the interference integrals in the extra dimension. A possibility of higher fermion states as dark matter candidates is shortly discussed.

   hep-phhep-th0 citations
10. 10*

    A radiative neutrino mass model in light of DAMPE excess with hidden gauged $U(1)$ symmetry

    Takaaki Nomura🇰🇷 · Hiroshi Okada🇹🇼 · Peiwen Wu🇰🇷

    We propose a one-loop induced neutrino mass model with hidden $U(1)$ gauge symmetry, in which we successfully involve a bosonic dark matter (DM) candidate propagating inside a loop diagram in neutrino mass generation to explain the $e^{+}{e}^{-}$ excess recently reported by the DArk Matter Particle Explorer (DAMPE) experiment. In our scenario dark matter annihilates into four leptons through $Z^{\prime }$ boson as DM DM $\to Z^{\prime }{Z}^{\prime }(Z^{\prime }\to {\ell }^{+}{\ell }^{-})$ and $Z^{\prime }$ decays into leptons via one-loop effect. We then investigate branching ratios of $Z^{\prime }$ taking into account lepton flavor violations and neutrino oscillation data.

    hep-phastro-ph.HEJCAP(2018)·9 citations
11. 11*

    Hadronic structure from double parton scattering

    Matteo Rinaldi🇪🇸 · Federico Alberto Ceccopieri🇧🇪

    In the present paper we consider the so-called effective cross section, a quantity which encodes the experimental knowledge on double parton scattering in hadronic collisions that has been accomulated so far. We show that the effective cross section, under some assumptions close to those adopted in its experimental extractions, can be used to obtain a range of mean transverse distance between an interacting parton pair in double parton scattering. Therefore we have proved that the effective cross section offers a way to access information on the hadronic structure.

    hep-phnucl-thPRD(2018)·34 citations
12. 12*

    The asymmetries of the $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ decay and the search of new physics beyond the Standard Model

    Hai-Bing Fu🇨🇳 · Xing-Gang Wu🇨🇳 · Wei Cheng🇨🇳 · Tao Zhong🇨🇳 · Zhan Sun🇨🇳

    In this paper, we compute the forward-backward asymmetry and the isospin asymmetry of the $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ decay. The $B\to K^{\ast }$ transition form factors (TFFs) are key components of the decay. To achieve a more accurate QCD prediction, we adopt a chiral correlator for calculating the QCD light-cone sum rules for those TFFs with the purpose of suppressing the uncertain high-twist distribution amplitudes. Our predictions show that the asymmetries under the Standard Model and the Minimal Supersymmetric Standard Model with minimal flavor violation are close in shape for $q^2\ge 6{\mathrm{GeV}}^2$ and are consistent with the Belle, LHCb and CDF data within errors. When $q^2<2{\mathrm{GeV}}^2$, their predictions behave quite differently. Thus a careful study on the $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ decay within small $q^2$-region could be helpful for searching new physics beyond the Standard Model. As a further application, we also apply the $B\to K^{\ast }$ TFFs to the branching ratio and longitudinal polarization fraction of the $B\to K^{\ast }\nu \bar{\nu }$ decay within different models.

    hep-phPRD(2018)·2 citations
13. 13*

    The Top Quark Mass at the LHC

    Paolo Nason🇮🇹

    I briefly discuss some theoretical aspects of top mass measurements at the LHC. In particular, I illustrate a recent theoretical study performed using next-to-leading order (NLO) calculations interfaced to shower generators (NLO+PS) of increasing accuracy, interfaced to both Pythia8 and Herwig7 Monte Carlo generators.

    hep-phhep-exFrascati Phys.Ser.(2017)·7 citations
14. 14*

    Study of the $DKK$ and $DK\bar{K}$ systems

    V. R. Debastiani🇪🇸 · J. M. Dias🇪🇸 · E. Oset🇪🇸

    Using the Fixed Center Approximation to Faddeev equations we have investigated the $DKK$ and $DK\bar{K}$ three-body systems, considering that the $D_{s0}^{\ast }(2317)$ acts as the heavy cluster in both cases, generated from the $DK$ interaction in isospin 0. For the $DK\bar{K}$ system we have found evidence of a state with $I(J^P)=1/2(0^{-})$ and mass about $2833-2858$ MeV, above the threshold of $D_{s0}^{\ast }(2317)\bar{K}$. Our results indicate that this state is dominated by a $D{f}_0(980)$ component, then it could be searched for in the $\pi \pi D$ invariant mass. On the other hand, no clear evidence related to a state from the $DKK$ interaction is found.

    hep-phPoS(2018)·0 citations
15. 15*

    The Proton Spin, Semi-Inclusive processes, and a future Electron Ion Collider

    Richard D. Ball🇬🇧 · A. Deshpande🇺🇸

    We discuss spin physics, Guido Altarelli's contribution to it, and what we still have to learn. We set out in particular a programme for incorporating constraints from semi-inclusive data into global fits of polarized PDFs, and discuss the need for the EIC to increase the precision and kinematic coverage of current measurements.

    hep-phhep-ex25 citations
16. 16*

    Serendipity in dark photon searches

    Philip Ilten🇬🇧 · Yotam Soreq🇺🇸 · Mike Williams🇺🇸 · Wei Xue🇨🇭

    Searches for dark photons provide serendipitous discovery potential for other types of vector particles. We develop a framework for recasting dark photon searches to obtain constraints on more general theories, which includes a data-driven method for determining hadronic decay rates. We demonstrate our approach by deriving constraints on a vector that couples to the $B-L$ current, a leptophobic $B$ boson that couples directly to baryon number and to leptons via $B$-$\gamma$ kinetic mixing, and on a vector that mediates a protophobic force. Our approach can easily be generalized to any massive gauge boson with vector couplings to the Standard Model fermions, and software to perform any such recasting is provided at https://gitlab.com/philten/darkcast .

    hep-phhep-exJHEP(2018)·461 citations
17. 17*

    Signatures of a Light Sterile Neutrino in T2HK

    Sanjib Kumar Agarwalla🇮🇳 · Sabya Sachi Chatterjee🇮🇳 · Antonio Palazzo🇮🇹

    We investigate the performance of T2HK in the presence of a light eV scale sterile neutrino. We study in detail its influence in resolving fundamental issues like mass hierarchy, CP-violation (CPV) induced by the standard CP-phase ${\delta }_{13}$ and new CP-phase ${\delta }_{14}$, and the octant ambiguity of ${\theta }_{23}$. We show for the first time in detail that due to the impressive energy reconstruction capabilities of T2HK, the available spectral information plays an important role to enhance the mass hierarchy discovery reach of this experiment in 3$\nu$ framework and also to keep it almost intact even in $4\nu$ scheme. This feature is also of the utmost importance in establishing the CPV due to ${\delta }_{14}$. As far as the sensitivity to CPV due to ${\delta }_{13}$ is concerned, it does not change much going from $3\nu$ to 4$\nu$ case. We also examine the reconstruction capability of the two phases ${\delta }_{13}$ and ${\delta }_{14}$, and find that the typical 1$\sigma$ uncertainty on ${\delta }_{13}$ (${\delta }_{14}$) in T2HK is $\sim 15^0$ ($30^0$). While determining the octant of ${\theta }_{23}$, we face a complete loss of sensitivity for unfavorable combinations of unknown ${\delta }_{13}$ and ${\delta }_{14}$.

    hep-phhep-exJHEP(2018)·36 citations
18. 18*

    Multi Quark Production in p+A collisions: Quantum Interference Effects

    Alex Kovner🇺🇸 · Amir H. Rezaeian🇨🇱

    We consider forward inclusive production of several quarks in the high energy p-A collisions in the CGC formalism. For three particle production we provide a complete expression in terms of multipole scattering amplitudes on the nucleus and multi particle generalized TMD's of the proton. We then calculate all the terms that are not suppressed by the factor of the area in four particle production, and generalize this result up to terms of order $1/N_c^2$ for arbitrary number of produced particles. Our results include the contribution of quantum interference effects both in the final state radiation (HBT) and in the initial projectile wave function (Pauli blocking).

    hep-phnucl-thPRD(2018)·25 citations
19. 19*

    Automated Calculation of Dijet Soft Functions in the Presence of Jet Clustering Effects

    Guido Bell🇩🇪 · Rudi Rahn🇨🇭 · Jim Talbert🇩🇪

    We extend our framework for the automated calculation of dijet soft functions to observables that do not obey the non-Abelian exponentiation theorem, like jet-veto or grooming soft functions that are sensitive to clustering effects of the jet algorithm. Although the matrix element for uncorrelated double emissions has a simpler structure than the one for correlated emissions, we argue that its singularity structure poses more stringent constraints on the required phase-space parametrisation. Our algorithm applies to both SCET-1 and SCET-2 soft functions and it is implemented in the novel program SoftSERVE. We present results for various jet-veto observables and obtain new predictions for the soft-drop jet-grooming algorithm.

    hep-phPoS(2018)·8 citations
20. 20*

    Axion Predictions in $SO(10)\times U(1{)}_{\mathrm{PQ}}$ Models

    Anne Ernst🇩🇪 · Andreas Ringwald🇩🇪 · Carlos Tamarit🇩🇪

    Non-supersymmetric Grand Unified $SO(10)\times U(1{)}_{\mathrm{PQ}}$ models have all the ingredients to solve several fundamental problems of particle physics and cosmology -- neutrino masses and mixing, baryogenesis, the non-observation of strong CP violation, dark matter, inflation -- in one stroke. The axion - the pseudo Nambu-Goldstone boson arising from the spontaneous breaking of the $U(1{)}_{\mathrm{PQ}}$ Peccei-Quinn symmetry - is the prime dark matter candidate in this setup. We determine the axion mass and the low energy couplings of the axion to the Standard Model particles, in terms of the relevant gauge symmetry breaking scales. We work out the constraints imposed on the latter by gauge coupling unification. We discuss the cosmological and phenomenological implications.

    hep-phJHEP(2018)·88 citations
21. 21*

    Production and mixing of scalar mesons in ${\eta }_c$ and ${\chi }_{c1}$ decays

    V. R. Debastiani🇪🇸 · Wei-Hong Liang🇨🇳 · Ju-Jun Xie🇨🇳 · E. Oset🇪🇸 · M. Bayar🇹🇷

    We briefly discuss how the chiral unitary approach in coupled channels and $SU(3)$ symmetry can be used to describe the production of $f_0(500)$, $f_0(980)$ and $a_0(980)$ in the ${\chi }_{c1}\to \eta {\pi }^{+}{\pi }^{-}$ reaction, recently measured by the BESIII collaboration. In this reaction a very strong peak for the $a_0(980)$ can be seen in the $\eta \pi$ invariant mass, while clear signals for the $f_0(500)$ and $f_0(980)$ appear in the one of ${\pi }^{+}{\pi }^{-}$. Next, we show the predictions made with the same model for the analogous decay ${\eta }_c\to \eta {\pi }^{+}{\pi }^{-}$, which could also be measured experimentally. We discuss the differences of these two reactions which are interesting to test the picture where these scalar mesons are dynamically generated from the interaction of pairs of pseudoscalars. Furthermore, we comment on a new recent work where the same model was used to study the $a_0(980)-f_0(980)$ mixing in the ${\chi }_{c1}\to {\pi }^0{\pi }^0\eta$ and ${\chi }_{c1}\to {\pi }^0{\pi }^{+}{\pi }^{-}$ reactions, showing that quantitative agreement with the experimental measurement of this mixing, also performed by BESIII, can be obtained, revealing interesting aspects of the dynamics of this process and the importance of coupled channels.

    hep-phPoS(2018)·0 citations
22. 22*

    Two-photon production of dilepton pairs in peripheral heavy ion collisions

    Spencer R. Klein🇺🇸

    The STAR collaboration has observed an excess production of $e^{+}{e}^{-}$ pairs in relativistic heavy ion collisions, over the expectations from hadronic production models. The excess pairs have transverse momenta $p_T<150\mathrm{MeV}/c$ and are most prominent in peripheral gold-gold and uranium-uranium collisions. The pairs exhibit a peak at the $J/\psi$ mass, but include a wide continuum, with pair invariant masses from 400 MeV/c${}^2$ up to 2.6 GeV/c${}^2$. The ALICE Collaboration observes a similar excess in peripheral lead-lead collisions, but only at the $J/\psi$ mass, without a corresponding continuum. This paper presents a calculation of the cross-section and kinematic for two-photon production of $e^{+}{e}^{-}$ pairs, and find general agreement with the STAR data. The calculation is based on the STARlight simulation code, which is based on the Weizsäcker-Williams virtual photon approach. The STAR continuum observations are compatible with two-photon production of $e^{+}{e}^{-}$ pairs. The ALICE analysis required individual muon $p_T$ be greater than 1 GeV/c; this eliminated almost all of the pairs from two-photon interactions, while leaving most of the $J/\psi$ decays.

    ↳ nucl-thhep-phPRC(2018)·51 citations
23. 23*

    The nature of the intrinsic spectra from the VHE emission of H 2356-309 and 1ES 1101-232

    Sarira Sahu🇲🇽 · Alberto Rosales de León🇲🇽 · Shigehiro Nagataki🇯🇵

    The VHE emission from the HBLs H 2356-309 and 1ES 1101-232 were observed by HESS telescopes during 2004--2007. Particularly the observation in 2004 from H 2356-309 and during 2004--2005 from 1ES 1101-232 were analyzed to derive strong upper limits on the EBL which was found to be consistent with the lower limits from the integrated light of resolved galaxies. Here we have used the photohadronic model corroborated by two template EBL models to fit the observed VHE gamma-ray data from these two HBLs and to predict their intrinsic spectra. We obtain very good fit to the VHE spectra of these two HBLs. However, the predicted intrinsic spectra are different for each EBL model. For the HBL H 2356-309, we obtain a flat intrinsic spectrum and for 1ES 1101-232 the spectrum is mildly harder than 2 but much softer than 1.5.

    ↳ astro-ph.HEhep-phEPJC(2018)·7 citations
24. 24*

    Shell model study on the possibility of using an effective field theory for disentangling several contributions to the neutrinoless double-beta decay

    Andrei Neacsu🇺🇸 · Mihai Horoi🇺🇸

    Neutrinoless double-beta decay represents the most promising approach for revealing some of the most important, yet-unknown, properties of neutrinos related to their absolute masses and their nature. This transition involves beyond standard model theories that predict the violation of the lepton number conservation by two units. There is no experimental confirmation yet for this decay, but new experiments have set lower-limits for the associated half-lives in the case of several isotopes. Using an effective field theory that describes this transition, we calculate half-life ratios for five experimentally interesting isotopes in the case of 12 lepton number violating couplings. These half-life ratios can be used to probe the sensitivity of the five isotopes in relation to their respective mechanisms, to predict the half-life limits needed to match the different experimental results, and in the case of experimental confirmation, these ratios could possibly indicate the dominant mechanism of the transition. We provide an analysis that could reveal valuable information regarding the dominant neutrinoless double-beta decay mechanism, if experimental half-life data becomes available for different isotopes.

    ↳ nucl-thhep-phhep-thPRC(2018)·34 citations
25. 25*

    Study of fermion pair productions at the ILC with center-of-mass energy of 250 GeV

    Hiroaki Yamashiro🇯🇵 · Kiyotomo Kawagoe🇯🇵 · Taikan Suehara🇯🇵 · Tamaki Yoshioka🇯🇵 · Keisuke Fujii🇯🇵 · Akiya Miyamoto🇯🇵

    Precise measurements of electroweak processes at the International Linear Collider (ILC) will provide unique opportunities to explore new physics beyond the Standard Model. Fermion pair productions are sensitive to a new contact interaction or a new heavy gauge boson by comparing cross section and angular distribution with expectations of the new physics models. In this proceedings we report a simulation study of fermion pair productions at a center-of-mass energy of 250 GeV, with a focus on lepton pairs, to demonstrate the potential of the first phase of the ILC.

    ↳ hep-exhep-ph3 citations
26. 26*

    Three Waves for Quantum Gravity

    Xavier Calmet🇬🇧 · Boris Latosh🇬🇧

    Using effective field theoretical methods, we show that besides the already observed gravitational waves, quantum gravity predicts two further massive classical fields leading to two new massive waves. We set a limit on the masses of these new modes using data from the Eöt-Wash experiment. We point out that the existence of these new states is a model independent prediction of quantum gravity. We then explain how these new classical fields could impact astrophysical processes and in particular the binary inspirals of neutron stars or black holes. We calculate the emission rate of these new states in binary inspirals astrophysical processes.

    ↳ hep-thgr-qchep-phEPJC(2018)·26 citations
27. 27*

    Nucleon viewed as a Borromean Bound-State

    Jorge Segovia🇪🇸 · Cédric Mezrag🇮🇹 · Lei Chang🇨🇳 · Craig D. Roberts🇺🇸

    We explain how the emergent phenomenon of dynamical chiral symmetry breaking ensures that Poincaré covariant analyses of the three valence-quark scattering problem in continuum quantum field theory yield a picture of the nucleon as a Borromean bound-state, in which binding arises primarily through the sum of two separate contributions. One involves aspects of the non-Abelian character of Quantum Chromodynamics that are expressed in the strong running coupling and generate tight, dynamical color-antitriplet quark-quark correlations in the scalar-isoscalar and pseudovector-isotriplet channels. This attraction is magnified by quark exchange associated with diquark breakup and reformation, which is required in order to ensure that each valence-quark participates in all diquark correlations to the complete extent allowed by its quantum numbers. Combining these effects, we arrive at a properly antisymmetrised Faddeev wave function for the nucleon and calculate, e.g. the flavor-separated versions of the Dirac and Pauli form factors and the proton's leading-twist parton distribution amplitude. We conclude that available data and planned experiments are capable of validating the proposed picture.

    ↳ nucl-thhep-exhep-lathep-phFew Body Syst.(2018)·2 citations
28. 28*

    The MAID Legacy and Future

    Lothar Tiator🇩🇪

    The MAID project is a collection of theoretical models for pseudoscalar meson photo- and electroproduction from nucleons. It is online available and produces results in real time calculations. In addition to kinematical variables also model parameters, especially for baryon resonances, can be online changed and investigated. Over 20 years MAID has become quite popular and the MAID web pages have been called more than 7.7 million times.

    ↳ nucl-thhep-phFew Body Syst.(2018)·25 citations
29. 29*

    Tidal disruption of fuzzy dark matter subhalo cores

    Xiaolong Du🇩🇪 · Bodo Schwabe🇩🇪 · Jens C. Niemeyer🇩🇪 · David Bürger🇩🇪

    We study tidal stripping of fuzzy dark matter (FDM) subhalo cores using simulations of the Schrödinger-Poisson equations and analyze the dynamics of tidal disruption, highlighting the differences with standard cold dark matter. Mass loss outside of the tidal radius forces the core to relax into a less compact configuration, lowering the tidal radius. As the characteristic radius of a solitonic core scales inversely with its mass, tidal stripping results in a runaway effect and rapid tidal disruption of the core once its central density drops below $4.5$ times the average density of the host within the orbital radius. Additionally, we find that the core is deformed into a tidally locked ellipsoid with increasing eccentricities until it is completely disrupted. Using the core mass loss rate, we compute the minimum mass of cores that can survive several orbits for different FDM particle masses and compare it with observed masses of satellite galaxies in the Milky Way.

    ↳ astro-ph.GAastro-ph.COgr-qchep-phPRD(2018)·97 citations
30. 30*

    Interaction of 160 GeV- Muon with Emulsion Nuclei

    S. M. Othman🇪🇬 · M.T. Ghoneim🇪🇬 · M.T. Hussein🇪🇬 · H.El-Smman🇪🇬 · A.Hussein🇪🇬

    In this work we present some results of the interaction of high energy muons with emulsion nuclei. The interaction results in emission of a number of fragments as a consequence of electromagnetic dissociation of the excited target nuclei. This excitation is attributed to absorption of photons by the target nuclei due to the intense electric field of the very fast incident muon particles. The interactions take place at impact parameters that allows ultra-peripheral collisions to take place, leading to giant resonances and hence multi-fragmentation of emulsion targets. Charge identification, range, energy spectra, angular distribution and topological cross-section of the produced fragments are measured and evaluated

    ↳ nucl-exhep-exhep-phphysics.ins-detIJMPE(2018)·1 citation
31. 31*

    On the vacuum-polarization Uehling potential for a Fermi charge distribution

    Jean-Christophe Pain🇫🇷

    We present analytical formulas for the vacuum-polarization Uehling potential in the case where the finite size of the nucleus is modeled by a Fermi charge distribution. Using a Sommerfeld-type development, the potential is expressed in terms of multiple derivatives of a particular integral. The latter and its derivatives can be evaluated exactly in terms of Bickley-Naylor functions, which connection to the Uehling potential was already pointed out in the pure Coulomb case, and of usual Bessel functions of the second kind. The cusp and asymptotic expressions for the Uehling potential with a Fermi charge distribution are also provided. Analytical results for the higher-order-contribution Källèn-Sabry potential are given.

    ↳ quant-phhep-phhep-thnucl-th+1Eur.Phys.J.D(2018)·2 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.