Mon·Oct 24, 2022Monday·October 24, 2022

1. 01*

   Perturbative QCD Core of Hadrons and Color Transparency Phenomena

   Leonid Frankfurt🇮🇱 · Mark Strikman🇺🇸

   In the current paper, we argue that the ground state of a hadron contains a significant perturbative quantum chromodynamics (pQCD) core as the result of color gauge invariance and of the values of chiral and gluon vacuum condensates. The evaluation within the method of dispersion sum rules (DSR) of the vacuum matrix elements of the correlator of local currents with the proper quantum numbers leads to the value of the radius of the pQCD core of a nucleon of about 0.4--0.5 fm. The selection of the initial and final states allows to select processes in which the pQCD core of the projectile gives the dominant contribution to the process. It is explained that the transparency of nuclear matter for the propagation of a spatially small and color-neutral wave packet of quarks and gluons -- a color transparency (CT) phenomenon -- for a group of hard processes off nuclear targets can be derived in the form of the QCD factorization theorem accounting for the color screening phenomenon Based on the success of the method of DSR, we argue that a pQCD core in a hadron wave function is surrounded by the layer consisting of quarks interacting with quark and gluon condensates. As a result, in the quasi-elastic processes $e+A\to e^{\prime }+N+(A-1{)}^{\ast }$, the quasi-Feynman mechanism could be dominating in a wide range of the momentum transfer squared, $Q^2$. In this scenario, a virtual photon is absorbed by a single quark, which carries a large fraction of the momentum of the nucleon and dominates in a wide range of $Q^2$. CT should reveal itself in these processes at an extremely large $Q^2$ as the consequence of the presence of the Sudakov form factors, which squeeze a nucleon.

   hep-phMDPI Physics(2022)·1 citation
2. 02*

   Gravitational wave background from vacuum and thermal fluctuations during axion-like inflation

   P. Klose🇨🇭 · M. Laine🇨🇭 · S. Procacci🇨🇭

   We revisit the framework of axion-like inflation in view of the possibility that the coupling of the inflaton to a non-Abelian topological charge density could lead to the generation of a rapidly thermalizing heat bath. Both dispersive (mass) and absorptive (friction) effects are included. For phenomenologically viable parameters, the system remains in a weak regime of warm inflation (thermal friction $\ll$ Hubble rate). For tensor perturbations we derive an interpolating formula that incorporates both vacuum and thermal production. The latter yields a model-independent frequency shape $\sim f_0^3$ in the LISA window, whose coefficient allows to measure the maximal shear viscosity of the thermal epoch. It is a challenge, however, to find models where the coefficient is large enough to be observable.

   hep-phastro-ph.COJCAP(2022)·34 citations
3. 03*

   Echo of the Dark: gravitational waves from dark SU(3) Yang-Mills theory

   Enrico Morgante🇩🇪 · Nicklas Ramberg🇩🇪 · Pedro Schwaller🇩🇪

   We analyze the phase transition in improved holographic QCD to obtain an estimate of the gravitational wave signal emitted in the confinement transition of a pure SU(3) Yang-Mills dark sector. We derive the effective action from holography and show that the energy budget and duration of the phase transition can be calculated with minor errors. These are used as input to obtain a prediction of the gravitational wave signal. To our knowledge, this is the first computation of the gravitational wave signal in a holographic model designated to match lattice data on the thermal properties of pure Yang-Mills.

   hep-phastro-ph.COhep-thPRD(2023)·89 citations
4. 04*

   Chiral extrapolation of hadronic vacuum polarization and isospin-breaking corrections

   Martin Hoferichter🇨🇭 · Gilberto Colangelo🇨🇭 · Bai-Long Hoid🇨🇭 · Bastian Kubis🇩🇪 · Jacobo Ruiz de Elvira🇪🇸 · Dominik Stamen🇩🇪 · Peter Stoffer🇨🇭

   By far the biggest contribution to hadronic vacuum polarization (HVP) arises from the two-pion channel. Its quark-mass dependence can be evaluated by combining dispersion relations with chiral perturbation theory, providing guidance on the functional form of chiral extrapolations, or even interpolations around the physical point. In addition, the approach allows one to estimate in a controlled way the isospin-breaking (IB) corrections that arise from the pion mass difference. As an application, we present an updated estimate of phenomenological expectations for electromagnetic and strong IB corrections to the HVP contribution to the anomalous magnetic moment of the muon. In particular, we include IB effects in the $\bar{K}K$ channel, which are enhanced due to the proximity of the $\bar{K}K$ threshold and the $\varphi$ resonance. The resulting estimates make it unlikely that the current tension between lattice-QCD and data-driven evaluations of the HVP contribution is caused by IB corrections.

   hep-phhep-exhep-latnucl-thPoS(2023)·20 citations
5. 05*

   Exclusive $\rho$ and $J/\Psi$ photoproduction in ultraperipheral $pO$ and $OO$ collisions at energies available at the CERN Large Hadron Collider

   Victor P. Goncalves🇧🇷 · Bruno D. Moreira🇧🇷 · Luana Santana🇧🇷

   Collisions with Oxygen ions at the LHC opens the possibility of investigating the description of the QCD dynamics in an unexplored regime, complementary to those performed in $pp$, $pPb$ and $PbPb$ collisions. In this paper we estimate the exclusive $\rho$ and $J/\Psi$ photoproduction in ultraperipheral $pO$ and $OO$ collisions at the Large Hadron Collider using the color dipole formalism and considering distinct models for the dipole - target scattering amplitude and different approaches for the modelling of the vector meson wave function. We present our predictions for the rapidity and transverse momentum distributions, as well as for the total cross sections considering the rapidity ranges covered by the ALICE and LHCb detectors. Such results indicate that a future experimental analysis of these final states is feasible and that its study can be useful to improve our understanding of the QCD dynamics at high energies.

   hep-phhep-exnucl-thPRC(2023)·8 citations
6. 06*

   The $\mu$-$\tau$ reflection symmetry of Majorana neutrinos

   Zhi-zhong Xing🇨🇳

   The observed pattern of lepton flavor mixing and CP violation strongly indicates the possible existence of a simple flavor symmetry in the neutrino sector -- the effective Majorana neutrino mass term keeps invariant when the three left-handed neutrino fields transform as ${\nu }_{e\mathrm{L}}^{}\to ({\nu }_{e\mathrm{L}}^{}{)}^c$, ${\nu }_{\mu \mathrm{L}}^{}\to ({\nu }_{\tau \mathrm{L}}^{}{)}^c$ and ${\nu }_{\tau \mathrm{L}}^{}\to ({\nu }_{\mu \mathrm{L}}^{}{)}^c$. A direct application of such a $\mu$-$\tau$ reflection symmetry to the canonical seesaw mechanism can help a lot to constrain the flavor textures of active and sterile Majorana neutrinos. The present article is intended to summarize the latest progress made in exploring the properties of this minimal flavor symmetry, its translational and rotational extensions, its soft breaking effects via radiative corrections from a superhigh energy scale to the electroweak scale, and its various phenomenological implications.

   hep-phRept.Prog.Phys.(2023)·55 citations
7. 07*

   The hadron pair forward-backward asymmetry in the electron positron annihilation process

   W. Yang🇨🇳 · C. Li🇨🇳

   The forward-backward asymmetry is an important measurable quantity which can enable independent determination of the neutral-current couplings of fermions. In this paper, we extend the definition of the asymmetry from the partonic level to the hadronic level by calculating this asymmetry of the hadron pair in the semi-inclusive electron position annihilation process. Semi-inclusive implies that a back-to-back jet is also measured in addition to the hadron pair. Due to the limitation of the factorization theorem, we calculate this process up to leading order twist-4 level by applying the collinear expansion formalism. After obtaining the differential cross section, we calculate the forward-backward asymmetries and show them in terms of the corresponding di-hadron fragmentation functions. Di-hadron fragmentation functions are introduced to describe the hadron pair productions in the fragmentation process. With available parameterization of the functions, we present a numerical estimation of the forward-backward asymmetry. On the flip side, measurements of the forward-backward asymmetry would give strict restrictions of parameterizations of the di-hadron fragmentation functions. We also present a numerical estimation of the twist-4 di-hadron fragmentation functions in order to illustrate their contributions.

   hep-phNPA(2023)·0 citations
8. 08*

   On the impact of meson mixing on $B_s\to \varphi ee$ angular observables at low $q^2$

   Sébastien Descotes-Genon🇫🇷 · Ioannis Plakias🇫🇷 · Olcyr Sumensari🇫🇷

   Decays based on the $b\to s\gamma$ transition are expected to yield left-handed photons in the Standard Model, but could be particularly sensitive to New Physics contributions modifying the short-distance Wilson coefficients ${\mathcal{C}}_7$ and ${\mathcal{C}}_{7^{\prime }}$ defined in the low-energy Effective Field Theory. These coefficients can be determined by combining observables of several modes, among which $B_s\to \varphi ee$ at low $q^2$, in a kinematic range where the photon-pole is dominant. We investigate the impact of $B_s-{\bar{B}}_s$ mixing on the angular observables available for this mode, which induces a time-dependent modulation governed by interference terms between mixing and decay that are sensitive to the moduli and phases of ${\mathcal{C}}_7$ and ${\mathcal{C}}_{7^{\prime }}$. These interference terms can be extracted through a time-dependent analysis but they also affect time-integrated observables. In particular, we show that the asymmetries $A_T^{(2)}$ and $A_T^{(\text{Im});CP}$ receive terms of potentially similar size from mixing-independent and mixing-induced terms, and we discuss how the constraints coming from the angular analysis of $B_s\to \varphi ee$ at low $q^2$ should be interpreted in the presence of mixing.

   hep-phhep-exJHEP(2023)·11 citations
9. 09*

   The full set of Polarized Deep Inelastic Scattering Structure Functions at NNLO accuracy

   Ignacio Borsa🇦🇷 · Daniel de Florian🇦🇷 · Iván Pedron🇦🇷

   We present the second order contributions to the coefficient functions for the parity violating polarized structure functions $g_L$ and $g_4$, thus completing the $\mathcal{O}({\alpha }_S^2)$ knowledge on DIS structure functions. We obtain the missing $\mathcal{O}({\alpha }_S^2)$ pieces from the known parity conserving unpolarized coefficient functions. We also present a phenomenological analysis for the phase space region the future Electron-Ion Collider is set to explore.

   hep-phEPJC(2022)·23 citations
10. 10*

    Neutron Lifetime Anomaly and Big Bang Nucleosynthesis

    Tammi Chowdhury🇨🇦 · Seyda Ipek🇨🇦

    We calculate the Big Bang Nucleosynthesis abundances for helium-4 and deuterium for a range of neutron lifetimes, ${\tau }_n=840-1050$ s, using the state-of-the-art Python package \textsc{PRyMordial}. We show the results for two different nuclear reaction rates, calculated by NACRE II [1] and the PRIMAT [2] collaborations.

    hep-phastro-ph.COnucl-thCan.J.Phys.(2024)·14 citations
11. 11*

    Charged Current Anomalies with Baryons

    Damir Becirevic🇫🇷 · Florentin Jaffredo🇫🇷

    Motivated by the first observation of ${\Lambda }_b\to {\Lambda }_c\tau \bar{\nu }$ by LHCb, we discuss various observables that can be derived from angular distribution of this decay which, if measured, could be essential for explanation of the $b\to c\tau \bar{\nu }$ anomalies. Furthermore, we show that the measurement of $R_{{\Lambda }_c}=\mathcal{B}({\Lambda }_b\to {\Lambda }_c\tau \bar{\nu })/\mathcal{B}({\Lambda }_b\to {\Lambda }_c\mu \bar{\nu })$ does not change the current global picture arising from $R_D^{}$ and $R_{D^{\ast }}^{}$ being larger than predicted in the Standard Model. Finally, we show the example of a few angular observables, with and without a secondary decay, that could have a strong discriminating power on New Physics.

    hep-ph0 citations
12. 12*

    The effective complex heavy-quark potential in an anisotropic quark-gluon plasma

    Ajaharul Islam🇺🇸 · Lihua Dong🇨🇳 · Yun Guo🇨🇳 · Alexander Rothkopf🇳🇴 · Michael Strickland🇺🇸

    We introduce a method for reducing anisotropic heavy-quark potentials to isotropic potentials by using an effective screening mass that depends on the quantum numbers $l$ and $m$ of a given state. We demonstrate that, using the resulting 1D effective potential model, one can solve a 1D Schrödinger equation and reproduce the full 3D results for the energies and binding energies of low-lying heavy-quarkonium bound states to relatively high accuracy. This includes the splitting of different p-wave polarizations. The resulting 1D effective model provides a way to include momentum anisotropy effects in open quantum system simulations of heavy-quarkonium dynamics in the quark-gluon plasma.

    hep-phEPJ Web Conf.(2022)·6 citations
13. 13*

    The centers of discrete groups as stabilizers of Dark Matter

    Darius Jurčiukonis🇱🇹 · Luís Lavoura🇵🇹

    The most usual option to stabilize Dark Matter (DM) is a $Z_2$ symmetry. In general, though, DM may be stabilized by any $Z_N$ with $N\ge 2$. We consider the way $Z_N$ is a subgroup of the internal-symmetry group $G$ of a model; we entertain the possibility that $Z_N$ is the center of $G$, yet $G$ is not of the form $Z_N\times G^{\prime }$, where $G^{\prime }$ is a group smaller (i.e. of lower order) than $G$. We examine all the discrete groups of order smaller than 2001 and we find that many of them cannot be written as the direct product of a cyclic group and some other group, yet they have a non-trivial center that might be used in Model Building to stabilize DM.

    hep-phPTEP(2023)·15 citations
14. 14*

    Fundamental physical constants: current results in search for variations and their description

    K. A. Bronnikov🇷🇺 · V. D. Ivashchuk🇷🇺 · V. V. Khruschov

    We consider the current results in search for and description of temporal variations of fundamental physical constants (FPCs) obtained under laboratory and astrophysical conditions. On the basis of fixed values of base constants, those FPCs have been chosen that can exhibit variations of greatest interest from the viewpoints of physics and metrology. An analysis of the current data concerning these constants is performed, and estimates of their variations on large time scales are presented. We point out the significance of studying long-term FPC variations for both practical and fundamental metrology.

    hep-phgr-qcMeas.Tech.(2022)·8 citations
15. 15*

    Cosmology as a weak gravitational field and the trans-Planckian problem

    Ilia Komissarov🇺🇸 · Alberto Nicolis🇺🇸 · John Staunton🇺🇸

    At momenta much higher than the Hubble scale, the cosmological expansion can be thought of as a weak gravitational field. We consider QFT in a particularly convenient set of coordinates that makes this manifest, so that, for those high momenta, the effects of the cosmological expansion can be dealt with using the standard tools of perturbation theory in Minkwoski space. In this way, we re-derive standard results of QFT in a cosmological background, such as mode-stretching and gravitational particle production. We discuss the implications of our results for the trans-Planckian problem.

    ↳ hep-thgr-qchep-phJHEP(2023)·10 citations
16. 16*

    Analytic continuation and physical content of the gluon propagator

    Fabio Siringo🇮🇹 · Giorgio Comitini🇮🇹

    The analytic continuation of the gluon propagator is revised in the light of recent findings on the possible existence of complex conjugated poles. The contribution of the anomalous pole must be added when Wick rotating, leading to an effective Minkowskian propagator which is not given by the trivial analytic continuation of the Euclidean function. The effective propagator has an integral representation in terms of a spectral function which is naturally related to a set of elementary (complex) eigenvalues of the Hamiltonian, thus generalizing the usual Källen-Lehmann description. A simple toy model shows how the elementary eigenvalues might be related to actual physical quasiparticles of the non-perturbative vacuum.

    ↳ hep-thhep-lathep-phPRD(2023)·9 citations
17. 17*

    Gravitational scattering of the sterile neutrino halo dark matter

    Man Ho Chan🇨🇳

    A recent study shows that gravitational scattering of dark matter, in the form of massive objects with mass $m\sim 10^3-10^4{M}_{\odot }$, could provide a possible solution to alleviate the small-scale structure problems of cold dark matter. The scattering cross section is velocity-dependent so that this scenario can explain why self-interaction of dark matter is significant in dwarf galaxies, but not in massive galaxies and galaxy clusters. In this Letter, we show that this kind of dark massive objects could be made of sterile neutrinos with a possible rest mass range $m_{\nu }\sim 7.6$ keV $-$ 71 MeV. This mass range generally satisfies most of the current observational constraints. The entire structure of the sterile neutrino halos can be simply predicted from standard physics.

    ↳ astro-ph.GAastro-ph.COhep-phMNRAS(2022)·0 citations
18. 18*

    Renormalization of One-Pion Exchange in Higher Partial Waves in Chiral Effective Field Theory for Antinucleon-Nucleon System

    Daren Zhou🇨🇳

    The renormalization of iterated one-pion exchange (OPE) has been studied in Chiral Effective Field Theory ($\chi$EFT) for the antinucleon-nucleon ($\overline{N}N$) scattering in some partial waves (Phys. Rev. C 105, 054005 (2022)). We go further for the other higher partial waves but with total angular momenta $J\le 3$ in this paper. Contact interactions are represented by a complex spherical well in coordinate space. Changing the radius of the spherical well means changing the cutoff. We check the cutoff dependence of the phase shifts, inelasticities, and mixing angles for the partial waves, and show that contact interactions are needed at leading order in channels where the singular tensor potentials of OPE are attractive. Results are compared with the energy-dependent partial-wave analysis of $\overline{N}N$ scattering data. Comparisons between our conclusions and applications of $\chi$EFT to the nucleon-nucleon system are discussed as well.

    ↳ nucl-thhep-phnucl-exCPC(2023)·0 citations
19. 19*

    All finite-mass Dirac monopoles

    Filip Blaschke🇨🇿 · Petr Beneš🇨🇿

    We present a "primitive" way of realizing finite-mass Dirac monopoles in $U(1)$ gauge theories involving a single non-minimally interacting scalar field. Typically, the energy density of this type of monopole is not concentrated at its core, but it is distributed in a spherical shell, as we illustrate on several exact solutions in the Bogomol'nyi-Prasad-Sommerfield (BPS) limit. We show that our construction can be interpreted as a limit of infinitely massive $W$ bosons coupled to electromagnetic field-strength via a dipole moment. Combining our approach with ideas of Weinberg and Lee, we present a general landscape of $U(1)$ gauge models that support a finite-mass Dirac monopole. In fact, all classical monopoles, i.e., Wu-Yang, 't Hooft-Polyakov, Cho-Maison, etc., are special points on this landscape.

    ↳ hep-thcond-mat.otherhep-phnlin.PSPRD(2022)·1 citation
20. 20*

    Pauli-Term-Induced Fixed Points in $d$-dimensional QED

    Holger Gies🇩🇪 · Kevin K. K. Tam🇩🇪 · Jobst Ziebell🇩🇪

    We explore the fixed-point structure of QED-like theories upon the inclusion of a Pauli spin-field coupling. We concentrate on the fate of UV-stable fixed points recently discovered in $d=4$ spacetime dimensions upon generalizations to lower as well as higher dimensions for an arbitrary number of fermion flavors $N_{\mathrm{f}}$. As an overall trend, we observe that going away from $d=4$ dimensions and increasing the flavor number tends to destabilize the non-Gaussian fixed points discovered in four spacetime dimensions. A notable exception is a non-Gaussian fixed point at finite Pauli spin-field coupling but vanishing gauge coupling, which also remains stable down to $d=3$ dimensions and for small flavor numbers. This includes also the range of degrees of freedom used in effective theories of layered condensed-matter systems. As an application, we construct renormalization group trajectories that emanate from the non-Gaussian fixed point and approach a long-range regime in the conventional QED${}_3$ universality class that is governed by the interacting (quasi) fixed point in the gauge coupling.

    ↳ hep-thcond-mat.str-elhep-phEPJC(2023)·4 citations
21. 21*

    Minimal Entanglement and Emergent Symmetries in Low-energy QCD

    Qiaofeng Liu🇺🇸 · Ian Low🇺🇸 · Thomas Mehen🇺🇸

    We study low-energy scattering of spin-1/2 baryons from the perspective of quantum information science, focusing on the correlation between entanglement minimization and the appearance of accidental symmetries. The baryon transforms as an octet under the SU(3) flavor symmetry and its interactions below the pion threshold are described by contact operators in an effective field theory (EFT) of QCD. Despite there being 64 channels in the 2-to-2 scattering, only six independent operators in the EFT are predicted by SU(3). We show that successive entanglement minimization in SU(3)-symmetric channels are correlated with increasingly large emergent symmetries in the EFT. In particular, we identify scattering channels whose entanglement suppression are indicative of emergent SU(6), SO(8), SU(8), and SU(16) symmetries. We also observe the appearance of non-relativistic conformal invariance in channels with unnaturally large scattering lengths. Improved precision from lattice simulations could help determine the degree of entanglement suppression, and consequently the amount of accidental symmetry, in low-energy QCD.

    ↳ quant-phhep-lathep-phhep-th+1PRC(2023)·91 citations
22. 22*

    Classical Gravitational Observables from the Eikonal Operator

    Paolo Di Vecchia🇩🇰 · Carlo Heissenberg🇸🇪 · Rodolfo Russo🇬🇧 · Gabriele Veneziano🇨🇭

    We propose two possible eikonal operators encoding the effects of classical radiation as coherent states of gravitons and show how to compute from them different classical observables. In the first proposal, only genuinely propagating gravitons are included, while, in the second, zero-frequency modes are added in order to recover the effects of a static gravitational field. We first calculate the radiated energy-momentum and the change in each particle's momentum, or impulse, to 3PM order finding agreement with the literature. We then calculate the angular momentum of the gravitational field after the collision. In order to do so, we adapt the method of reverse unitarity to the presence of derivatives in the operators describing the angular momentum and reproduce the result of~\cite{Manohar:2022dea} obtained by resumming the small-velocity expansion. As a new application, we derive also the variation in each particle's angular momentum up to 3PM: calculating separately field and particle contributions allows us to check the balance laws explicitly. We also show how the eikonal operator encodes the linear-response formula of Bini-Damour by deriving the linear radiation-reaction contribution to the transverse impulse at 4PM.

    ↳ hep-thgr-qchep-phPLB(2023)·101 citations
23. 23*

    Assessing the theory-data tension in neutrino-induced charged pion production: the effect of final-state nucleon distortion

    Alexis Nikolakopoulos🇺🇸 · Raúl González-Jiménez🇪🇸 · Natalie Jachowicz🇧🇪 · José Manuel Udías🇪🇸

    Pion production on nuclei constitutes a significant part of the total cross section in experiments involving few-GeV neutrinos. Combined analyses of data on deuterium and heavier nuclei points to tensions between the bubble chamber data and the data of the MINER$\nu$A experiment, which are often ascribed to unspecified nuclear effects. To understand the origin of these tensions, a microscopic quantum mechanical framework is needed to compute nuclear matrix elements. We use the local approximation to the relativistic distorted wave impulse approximation (RDWIA) to assess the role of final-state nucleon distortion. To perform this comparison under conditions relevant to neutrino experiments, we compute cross sections for the MINER$\nu$A and T2K charged pion production datasets. The inclusion of nucleon distortion leads to a reduction of the cross section up to 10\%, but to no significant change in shape of the flux-averaged cross sections. Results with and without distortion compare favorably to experimental data, with the exception of the low-$Q^2$ MINER$\nu$A ${\pi }^{+}$ data. We point out that hydrogen target data from BEBC is also overpredicted at low-$Q^2$, and that the discrepancy is similar in shape and magnitude to what is found in comparison to MINER$\nu$A data. Including nucleon distortion alone cannot explain the overprediction of low-$Q^2$ cross sections measured by MINER$\nu$A. The similar overprediction of BEBC data on hydrogen means that it is impossible to ascribe this discrepancy solely to a nuclear effect. Axial couplings and their $Q^2$ dependence should ideally be derived from more precise data on hydrogen and deuterium.

    ↳ nucl-thhep-phPRD(2023)·13 citations
24. 24*

    Silicon $4\pi$ spectrometer for $\beta$-decay electrons with energies up to 3~MeV

    I.E. Alexeev🇷🇺 · S.V. Bakhlanov🇷🇺 · E.A. Chmel🇷🇺 · A.V. Derbin🇷🇺 · I.S. Drachnev🇷🇺 · I.M. Kotina🇷🇺 · M.S. Mikulich🇷🇺 · V.N. Muratova🇷🇺 · N.V. Nyazova🇷🇺 · D.A. Semenov🇷🇺 · M.V. Trushin🇷🇺 · E.V. Unzhakov🇷🇺

    We present a description of the originally developed $\beta$-spectrometer consisting of two Si(Li)-detectors with sensitive area thickness above 8~mm and $4\pi$-geometry. The full absorption spectrometer allows for direct measurements of $\beta$-spectra, disregarding the corrections to the response function induced by the electron backscattering from the crystal surface. In case of $\beta$-spectra of transitions to the excited state of the daughter isotope additional 3" BGO-detector is used in order to detect the $\gamma$-quanta in coincidence with the pair of Si(Li)-spectrometers.

    ↳ physics.ins-dethep-exhep-phnucl-ex0 citations
25. 25*

    Textbook myths about early atomic models

    Reidun Renstrøm · Nils-Erik Bomark🇳🇴

    Most physics textbooks at college and university level introduce quantum physics in a historical context. However, the textbook version of this history does not match the actual history. In this article, the first in a series of articles looking at the textbook description of the quantum history, we follow an exceptional student through her endeavors to understand the early atomic models that led up to the work of Niels Bohr. We experience her disappointment when she discovers that the description of the famous atomic model by Thomson, is a mere caricature with almost no trace of Thomson's work and that the supposedly important radiative instability of Rutherford's atoms, is not there at all; how could it be? Rutherford did not even discuss the motion of the electrons. These flaws in the narrative are not just cosmetic inaccuracies, the main narrative is centered around claims that are simply wrong or non-existent in the real story and thus rendering the whole telling mere fiction. We as a physics community should do better.

    ↳ physics.ed-phhep-phphysics.hist-ph1 citation

* 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.