Fri·Sep 29, 2017Friday·September 29, 2017

1. 01*

   Theory and Phenomenology of Planckian Interacting Massive Particles as Dark Matter

   Mathias Garny🇩🇪 · Andrea Palessandro🇩🇰 · McCullen Sandora🇺🇸 · Martin S. Sloth🇩🇰

   Planckian Interacting Dark Matter (PIDM) is a minimal scenario of dark matter assuming only gravitational interactions with the standard model and with only one free parameter, the PIDM mass. PIDM can be successfully produced by gravitational scattering in the thermal plasma of the Standard Model sector after inflation in the PIDM mass range from TeV up to the GUT scale, if the reheating temperature is sufficiently high. The minimal assumption of a GUT scale PIDM mass can be tested in the future by measurements of the primordial tensor-to-scalar ratio. While large primordial tensor modes would be in tension with the QCD axion as dark matter in a large mass range, it would favour the PIDM as a minimal alternative to WIMPs. Here we generalise the previously studied scalar PIDM scenario to the case of fermion, vector and tensor PIDM scenarios, and show that the phenomenology is nearly identical, independent of the spin of the PIDM. We also consider the specific realisation of the PIDM as the Kaluza Klein excitation of the graviton in orbifold compactifications of string theory, as well as in models of monodromy inflation and in Higgs inflation. Finally we discuss the possibility of indirect detection of PIDM through non-perturbative decay.

   hep-phastro-ph.COastro-ph.HEhep-thJCAP(2018)·159 citations
2. 02*

   Constraining the gluon PDF at large x with LHC data

   Emanuele R. Nocera🇬🇧 · Maria Ubiali🇬🇧

   The NNPDF collaboration has recently presented NNPDF3.1, a new determination of the parton distribution functions (PDFs) of the proton including a number of new data, some of which are particularly sensitive to the gluon PDF at large x. In this contribution, we present the results of two new analyses based on NNPDF3.1. First, we study the impact of the ATLAS 2011 7 TeV inclusive jet data on the gluon PDF including different rapidity bins. Second, we quantitatively compare the constraints provided by all measurements sensitive to the large-x gluon PDF, namely inclusive jet cross sections, the transverse momentum distributions of the Z-boson and top-pair rapidity distributions.

   hep-phPoS(2018)·24 citations
3. 03*

   Probing the baryogenesis and dark matter relaxed in phase transition by gravitational waves and colliders

   Fa Peng Huang🇰🇷 · Chong Sheng Li🇨🇳

   The cosmological phase transition with Q-balls production mechanism can explain the baryogenesis and dark matter simultaneously, where constraints on dark matter masses and reverse dilution are significantly relaxed. We study how to probe this scenario by collider signals at QCD next-to-leading order and gravitational wave signals.

   hep-phPRD(2017)·73 citations
4. 04*

   Jet substructure shedding light on heavy Majorana neutrinos at the LHC

   Arindam Das🇰🇷 · Partha Konar🇮🇳 · Arun Thalapillil🇮🇳

   The existence of tiny neutrino masses and flavor mixings can be explained naturally in various seesaw models, many of which typically having additional Majorana type SM gauge singlet right handed neutrinos ($N$). If they are at around the electroweak scale and furnished with sizeable mixings with light active neutrinos, they can be produced at high energy colliders, such as the Large Hadron Collider (LHC). A characteristic signature would be same sign lepton pairs, violating lepton number, together with light jets -- $pp\to N{\ell }^{\pm },N\to {\ell }^{\pm }{W}^{\mp },W^{\mp }\to jj$. We propose a new search strategy utilising jet substructure techniques, observing that for a heavy right handed neutrino mass $M_N$ much above $M_{W^{\pm }}$, the two jets coming out of the boosted $W^{\pm }$ may be interpreted as a single fat-jet ($J$). Hence, the distinguishing signal topology will be ${\ell }^{\pm }{\ell }^{\pm }J$. Performing a comprehensive study of the different signal regions along with complete background analysis, in tandem with detector level simulations, we compute statistical significance limits. We find that heavy neutrinos can be explored effectively for mass ranges $300$ GeV $\le M_N\le 800$ GeV and different light-heavy neutrino mixing $|V_{\mu N}{|}^2$. At the 13 TeV LHC with 3000 ${\mathrm{fb}}^{-1}$ integrated luminosity one can competently explore mixing angles much below present LHC limits, and moreover exceed bounds from electroweak precision data.

   hep-phhep-exJHEP(2018)·59 citations
5. 05*

   Magnetic dipole moment of $Z_b(10610)$ in light-cone QCD

   U. Ozdem🇹🇷 · K. Azizi🇹🇷

   The magnetic dipole moment of the exotic $Z_b(10610)$ state is calculated within the light cone QCD sum rule method using the diquark-antidiquark and molecule interpolating currents. The magnetic dipole moment is obtained as ${\mu }_{Z_b}=1.73\pm 0.63{\mu }_N$ in diquark-antidiquark picture and ${\mu }_{Z_b}=1.59\pm 0.58{\mu }_N$ in the molecular case. The obtained results in both pictures together with the results of other theoretical studies on the spectroscopic parameters of the $Z_b(10610)$ state may be useful in determination of the nature and quark organization of this state.

   hep-phPRD(2018)·20 citations
6. 06*

   Signatures of Self-Interacting Dark Matter in the Matter Power Spectrum and the CMB

   Ran Huo🇺🇸 · Manoj Kaplinghat🇺🇸 · Zhen Pan🇺🇸 · Hai-Bo Yu🇺🇸

   We consider a self-interacting dark matter model in which the massive dark photon mediating the self-interaction decays to light dark fermions to avoid over-closing the universe. We find that if the model is constrained to explain the dark matter halos inferred for spiral galaxies and galaxy clusters simultaneously, there is a strong indication that dark matter is produced asymmetrically in the early universe. It also implies the presence of dark radiation, late kinetic decoupling for dark matter, and a suppressed linear power spectrum due to dark acoustic damping. The Lyman-$\alpha$ forest power spectrum measurements put a strong upper limit on the damping scale and the model has little room to reduce the abundances of satellite galaxies. Future observations in the matter power spectrum and the CMB, in tandem with the impact of self-interactions in galactic halos, makes it possible to measure the gauge coupling and masses of the dark sector particles even when signals in conventional dark matter searches are absent.

   hep-phastro-ph.COastro-ph.GAPLB(2018)·64 citations
7. 07*

   A Stronger Case for Superunification Post Higgs Boson Discovery

   Pran Nath🇺🇸 · Raza M. Syed🇦🇪

   Supersymmetry and more specifically supergravity grand unification allow one to extrapolate physics from the electroweak scale up to the grand unification scale consistent with electroweak data. Here we give a brief overview of their current status and show that the case for supersymmetry is stronger as a result of the Higgs boson discovery with a mass measurement at $\sim 125$ GeV consistent with the supergravity grand unification prediction that the Higgs boson mass lie below 130 GeV. Thus the discovery of the Higgs boson and the measurement of its mass provide a further impetus for the search for sparticles to continue at the current and future colliders.

   hep-phhep-exPhys.Scripta(2017)·3 citations
8. 08*

   Parametrizations of three-body hadronic $B$- and $D$-decay amplitudes in terms of analytic and unitary meson-meson form factors

   D. Boito🇧🇷 · J.-P. Dedonder🇫🇷 · B. El-Bennich🇧🇷 · R. Escribano🇪🇸 · R. Kaminski🇵🇱 · L. Lesniak🇵🇱 · B. Loiseau🇫🇷

   We introduce parametrizations of hadronic three-body $B$ and $D$ weak decay amplitudes that can be readily implemented in experimental analyses and are a sound alternative to the simplistic and widely used sum of Breit-Wigner type amplitudes, also known as the isobar model. These parametrizations can be particularly useful in the interpretation of CP asymmetries in the Dalitz plots. They are derived from previous calculations based on a quasi-two-body factorization approach in which two-body hadronic final state interactions are fully taken into account in terms of unitary $S$- and $P$-wave $\pi \pi$, $\pi K$ and $K\bar{K}$ form factors. These form factors can be determined rigorously, fulfilling fundamental properties of quantum field-theory amplitudes such as analyticity and unitarity, and are in agreement with the low-energy behaviour predicted by effective theories of QCD. They are derived from sets of coupled-channel equations using $T$-matrix elements constrained by experimental meson-meson phase shifts and inelasticities, chiral symmetry and asymptotic QCD. We provide explicit amplitude expressions for the decays $B^{\pm }\to {\pi }^{+}{\pi }^{-}{\pi }^{\pm }$, $B\to K{\pi }^{+}{\pi }^{-}$, $B^{\pm }\to K^{+}{K}^{-}{K}^{\pm }$, $D^{+}\to {\pi }^{-}{\pi }^{+}{\pi }^{+}$, $D^{+}\to K^{-}{\pi }^{+}{\pi }^{+}$, $D^0\to K_S^0{\pi }^{+}{\pi }^{-}$, for which we have shown in previous studies that this approach is phenomenologically successful, in addition, we provide expressions for the $D^0\to K_S^0{K}^{+}{K}^{-}$ decay. Other three-body hadronic channels can be parametrized likewise.

   hep-phhep-exPRD(2017)·50 citations
9. 09*

   Chiral partner structure of doubly heavy baryons with heavy quark spin-flavor symmetry

   Yong-Liang Ma🇨🇳 · Masayasu Harada🇯🇵

   The spectrum of the doubly heavy baryons is estimated with respect to the new observation from the LHCb collaboration [Aaij:2017ueg] by using the chiral partner structure and heavy quark spin-flavor symmetry. The effects of heavy quark flavor symmetry breaking and light quark flavor symmetry are considered. The mass splitting of doubly heavy baryons with the same spin but opposite parity arises from the generalized Goldberger-Treiman relation. The intermultiplet one-pion transition and intramultiplet radiative transitions are also be estimated.

   hep-phhep-exJ.Phys.G(2018)·53 citations
10. 10*

    The issue of gauge choice in the Landau problem and the physics of canonical and mechanical orbital angular momenta

    M. Wakamatsu🇨🇳 · Y. Kitadono🇨🇳 · P.-M. Zhang🇨🇳

    One intriguing issue in the nucleon spin decomposition problem is the existence of two types of decompositions, which are representably characterized by two different orbital angular momenta (OAMs) of quarks. The one is the manifestly gauge-invariant mechanical OAM, while the other is the so-called gauge-invariant canonical (g.i.c.) OAM, the concept of which was introduced by Chen et al. To get a deep insight into the difference of these two decompositions, it is therefore vitally important to understand the the physical meanings of the above two OAMs correctly. Also to be clarified is the implication of the gauge symmetry that is immanent in the concept of g.i.c. OAM. We find that the famous Landau problem provides us with an ideal tool to answer these questions owing to its analytically solvable nature. After deriving a complete relation between the standard eigen-functions of the Landau Hamiltonian in the Landau gauge and in the symmetric gauge, we try to unravel the physics of the the canonical OAM and the mechanical OAM, by paying special attention to their gauge-dependence. We also argue that, different from the mechanical OAM of the electron, the canonical OAM or its gauge-invariant version would not correspond to any direct observables at least in the Landau problem. Also briefly discussed is the uniqueness or non-uniqueness problem of the nucleon spin decomposition, which arises from the arbitrariness in the definition of the so-called physical component of the gauge field.

    hep-phquant-phAnnals Phys.(2018)·34 citations
11. 11*

    Single-spin asymmetries in SIDIS induced by anomalous gluon-quark and photon-quark couplings

    Xu Cao🇨🇳 · Nikolai Korchagin🇷🇺 · Nikolai Kochelev🇨🇳 · Pengming Zhang🇨🇳

    We calculate the contribution of the non-perturbative Pauli couplings in the quark-photon and quark-gluon vertices to the single-spin asymmetries (SSAs) in semi-inclusive deep inelastic scattering (SIDIS). We describe the nucleon using the spectator model with scalar and axial-vector diquarks. Both of the new couplings can cause the helicity flip of the struck quark. The helicity flip and the rescattering induced by the non-perturbative gluon exchange between the struck quark and diquark lead to the SSAs. Their azimuthal dependencies are the same as that usually ascribed to the Collins and Sivers effects. Our numerical results, based on the instanton model for the QCD vacuum, show that the non-perturbative quark-gluon and quark-photon interactions have a strong influence on these asymmetries.

    hep-phPRD(2017)·1 citation
12. 12*

    Effect of sterile Neutrinos and Nonstandard Interactions on the Geo-neutrino Flux

    Guanwen Yan🇺🇸

    We calculate the effect of sterile neutrinos and nonstandard neutrino interactions on the flux of active neutrinos from the Earth's crust and mantle taking matter effect into account in both cases. For simple Earth model and using previous emission flux estimates at the source, we find that for reasonable choice of parameters for both the sterile neutrino and nonstandard interaction, the effect on the neutrino flux is a few percent or less.

    hep-ph0 citations
13. 13*

    Vector Boson Fusion in the Inert Doublet Model

    Bhaskar Dutta🇺🇸 · Guillermo Palacio🇨🇴 · Jose D. Ruiz-Alvarez🇨🇴 · Diego Restrepo🇨🇴

    In this paper we probe inert Higgs doublet model at the LHC using Vector Boson Fusion (VBF) search strategy. We optimize the selection cuts and investigate the parameter space of the model and we show that the VBF search has a better reach when compared with the monojet searches. We also investigate the Drell-Yan type cuts and show that they can be important for smaller charged Higgs masses. We determine the $3\sigma$ reach for the parameter space using these optimized cuts for a luminosity of 3000 fb${}^{-1}$.

    hep-phPRD(2018)·33 citations
14. 14*

    Analysis of branon dark matter and extra-dimensional models with AMS-02

    Jose A. R. Cembranos🇪🇸 · Alvaro de la Cruz-Dombriz🇿🇦 · Peter K. S. Dunsby🇿🇦 · Miguel Mendez-Isla🇿🇦

    In the following work, we compute the positron production from branon dark matter annihilations in order to constrain extra-dimensional theories. By having assumed that the positron fraction measured by AMS-02 is well explained just with astrophysical sources, exclusion diagrams for the branon mass and the tension of the brane, the two parameters characterising the branon phenomenology become possible. Our analysis has been performed for a minimal and a medium diffusion model in one extra dimension for both pseudo-isothermal and Navarro Frenck White dark matter haloes. Our constraints in the dark matter mass candidate range between 200 GeV and 100 TeV. Combined with previous cosmological analyses and experimental data in colliders, it allows us to set bounds on the parameter space of branons. In particular, we have discarded regions in the mass-tension diagram up to a branon mass of 28 TeV for the pseudo-Isothermal prole and minimal diffusion, and 63 TeV for the Navarro-Frenck-White profile and medium diffusion.

    hep-phastro-ph.COPLB(2019)·9 citations
15. 15*

    On the universal structure of Higgs amplitudes mediated by heavy particles

    German F. R. Sborlini🇮🇹 · Felix Driencourt-Mangin🇪🇸 · German Rodrigo🇪🇸

    We describe the calculation of the one-loop corrections to $H\to \gamma \gamma$ and $gg\to H$ within the four-dimensional unsubtraction/loop-tree duality (FDU/LTD) approach. The fact that these corrections are both IR and UV finite is not enough to perform the computation without a proper regularization of the intermediate steps. We show how the FDU/LTD method unambiguously leads to the proper result with a pure four-dimensional representation of the loop amplitude. Moreover, this method allows us to obtain very compact expressions which share the same functional structure independently of the particles circulating the loop. Besides this, asymptotic expansions for the low and high mass regime naturally arise as a consequence of the smoothness of the integrands obtained to describe the amplitudes.

    hep-phhep-thPoS(2017)·3 citations
16. 16*

    $K_S^0-K_L^0$ Asymmetries and $CP$ Violation in Charmed Baryon Decays into Neutral Kaons

    Di Wang🇨🇳 · Peng-Fei Guo🇨🇳 · Wen-Hui Long🇨🇳 · Fu-Sheng Yu🇨🇳

    We study the $K_S^0-K_L^0$ asymmetries and $CP$ violations in charm-baryon decays with neutral kaons in the final state. The $K_S^0-K_L^0$ asymmetry can be used to search for two-body doubly Cabibbo-suppressed amplitudes of charm-baryon decays, with the one in ${\Lambda }_c^{+}\to p{K}_{S,L}^0$ as a promising observable. Besides, it is studied for a new $CP$-violation effect in these processes, induced by the interference between the Cabibbo-favored and doubly Cabibbo-suppressed amplitudes with the neutral kaon mixing. Once the new CP-violation effect is determined by experiments, the direct $CP$ asymmetry in neutral kaon modes can then be extracted and used to search for new physics. The numerical results based on $SU(3)$ symmetry will be tested by the experiments in the future.

    hep-phJHEP(2018)·59 citations
17. 17*

    Interpretation of the top-quark mass results

    Gennaro Corcella🇮🇹

    I discuss recent work aimed at interpreting the top-quark mass measurements at the LHC and determining the theoretical uncertainty.

    hep-phPoS(2018)·3 citations
18. 18*

    Resolving the SELEX--LHCb Double-Charm Baryon Conflict: The Impact of Intrinsic Heavy-Quark Hadroproduction and Supersymmetric Light-Front Holographic QCD

    S.J. Brodsky🇺🇸 · S. Groote🇪🇪 · S. Koshkarev🇪🇪

    In this paper we show that the intrinsic heavy-quark QCD mechanism for the hadroproduction of heavy hadrons at large $x_F$ can resolve the apparent conflict between measurements of double-charm baryons by the SELEX fixed-target experiment and the LHCb experiment at the LHC collider. We show that both experiments are compatible, and that both results can be correct. The observed spectroscopy of double-charm hadrons is in agreement with the predictions of supersymmetric light front holographic QCD.

    hep-phnucl-thEPJC(2018)·39 citations
19. 19*

    Neutrino oscillation processes in quantum field-theoretical approach

    Vadim O. Egorov🇷🇺 · Igor P. Volobuev🇷🇺

    It is shown that neutrino oscillation processes can be consistently described in the framework of quantum field theory. Namely, the oscillating electron survival probabilities in experiments with neutrino detection by charged-current and neutral-current interactions are calculated in the quantum field-theoretical approach to neutrino oscillations based on a modification of the Feynman propagator. The approach is most similar to the standard Feynman diagram technique in the momentum representation. It is found that the oscillating distance-dependent probabilities of detecting an electron in experiments with neutrino detection by charged-current and neutral-current interactions exactly coincide with the corresponding probabilities calculated in the standard approach.

    hep-phhep-thPRD(2018)·16 citations
20. 20*

    Theory of hadronic molecules applied to the XYZ states

    C. Hanhart🇩🇪

    In recent years data have been accumulated at various experiments about states in the heavy quarkonium mass range that seem to be inconsistent with the most simple variants of the quark model. In this contribution it is demonstrated that most of those data are consistent with a dominant molecular nature of those states. It is also discussed which kind of observables are sensitive to the molecular component and which are not.

    hep-phEPJ Web Conf.(2019)·4 citations
21. 21*

    Hierarchical Fermions and Detectable $Z^{\prime }$ from Effective Two-Higgs-Triplet 3-3-1 Model

    E. R. Barreto🇧🇷 · A. G. Dias🇧🇷 · J. Leite🇧🇷 · C. C. Nishi🇧🇷 · R. L. N. Oliveira🇧🇷 · W. C. Vieira🇧🇷

    We develop a $\mathrm{SU}(3{)}_C\otimes \mathrm{SU}(3{)}_L\otimes \mathrm{U}(1{)}_X$ model where the number of fermion generations is fixed by cancellation of gauge anomalies, being a type of 3-3-1 model with new charged leptons. Similarly to the economical 3-3-1 models, symmetry breaking is achieved effectively with two scalar triplets so that the spectrum of scalar particles at the TeV scale contains just two CP even scalars, one of which is the recently discovered Higgs boson, plus a charged scalar. Such a scalar sector is simpler than the one in the Two Higgs Doublet Model, hence more attractive for phenomenological studies, and has no FCNC mediated by scalars except for the ones induced by the mixing of SM fermions with heavy fermions. We identify a global residual symmetry of the model which guarantees mass degeneracies and some massless fermions whose masses need to be generated by the introduction of effective operators. The fermion masses so generated require less fine-tuning for most of the SM fermions and FCNC are naturally suppressed by the small mixing between the third family of quarks and the rest. The effective setting is justified by an ultraviolet completion of the model from which the effective operators emerge naturally. A detailed particle mass spectrum is presented, and an analysis of the $Z^{\prime }$ production at the LHC run II is performed to show that it could be easily detected by considering the invariant mass and transverse momentum distributions in the dimuon channel.

    hep-phPRD(2018)·17 citations
22. 22*

    Probing New Physics in Low Energy Solar Neutrino Oscillation Data

    Amir N. Khan🇩🇪 · Douglas W. McKay🇺🇸

    We explore the effects of nonstandard neutrino interactions in the lower components of the solar neutrino spectrum which are predominant by the vacuum oscillations. The recent measurements of Borexino experiment between 2011 and 2015 provide a clean test to study the nonstandard neutrino interactions at the source (sun) and the at solar detector. In this work, first the possible standard model parameters are estimated from the combined data of the low energy regime and then the nonstandard effects at the source, at the detector, and from the interplay between source and detector parameters are bounded. The same effects are also investigated for the proposed experiments like LENA and Jinpin Neutrino Experiment with their projected sensitivities.

    hep-phhep-exhttp://www2.yukawa.kyoto-u.ac.jp/~soken.e…·0 citations
23. 23*

    Coupled dynamics in gluon mass generation and the impact of the three-gluon vertex

    Daniele Binosi🇮🇹 · Joannis Papavassiliou🇪🇸

    We present a detailed study of the subtle interplay transpiring at the level of two integral equations that are instrumental for the dynamical generation of a gluon mass in pure Yang-Mills theories. The main novelty is the joint treatment of the Schwinger-Dyson equation governing the infrared behaviour of the gluon propagator and of the integral equation that controls the formation of massless bound-state excitations, whose inclusion is instrumental for obtaining massive solutions from the former equation. The self-consistency of the entire approach imposes the requirement of using a single value for the gauge coupling entering in the two key equations; its fulfillment depends crucially on the details of the three-gluon vertex, which contributes to both of them, but with different weight. In particular, the characteristic suppression of this vertex at intermediate and low energies enables the convergence of the iteration procedure to a single gauge coupling, whose value is reasonably close to that extracted from related lattice simulations.

    hep-phhep-lathep-thPRD(2018)·46 citations
24. 24*

    Peccei-Quinn Relaxion

    Kwang Sik Jeong🇰🇷 · Chang Sub Shin🇰🇷

    The relaxation mechanism, which solves the electroweak hierarchy problem without relying on TeV scale new physics, crucially depends on how a Higgs-dependent back-reaction potential is generated. In this paper, we suggest a new scenario in which the scalar potential induced by the QCD anomaly is responsible both for the relaxation mechanism and the Peccei-Quinn mechanism to solve the strong CP problem. The key idea is to introduce the relaxion and the QCD axion whose cosmic evolutions become quite different depending on an inflaton-dependent scalar potential. Our scheme raises the cutoff scale of the Higgs mass up to 10^7 GeV, and allows reheating temperature higher than the electroweak scale as would be required for viable cosmology. In addition, the QCD axion can account for the observed dark matter of the universe as produced by the conventional misalignment mechanism. We also consider the possibility that the couplings of the Standard Model depend on the inflaton and become stronger during inflation. In this case, the relaxation can be implemented with a sub-Planckian field excursion of the relaxion for a cutoff scale below 10 TeV.

    hep-phJHEP(2018)·9 citations
25. 25*

    High-energy resummation in heavy-quark pair photoproduction

    Francesco Giovanni Celiberto🇮🇹 · Dmitry Yu. Ivanov🇷🇺 · Beatrice Murdaca🇮🇹 · Alessandro Papa🇮🇹

    We present our predictions for the inclusive production of two heavy quark-antiquark pairs, separated by a large rapidity interval, in the collision of (quasi-)real photons at the energies of LEP2 and of some future electron-positron colliders. We include in our calculation the full resummation of leading logarithms in the center-of-mass energy and a partial resummation of the next-to-leading logarithms, within the Balitsky-Fadin-Kuraev-Lipatov (BFKL) approach.

    hep-phPLB(2018)·78 citations
26. 26*

    Prospects for Improved Understanding of Isotopic Reactor Antineutrino Fluxes

    Y. Gebre🇺🇸 · B. R. Littlejohn🇺🇸 · P. T. Surukuchi🇺🇸

    Predictions of antineutrino fluxes produced by fission isotopes in a nuclear reactor have recently received increased scrutiny due to observed differences in predicted and measured inverse beta decay (IBD) yields, referred to as the 'reactor antineutrino flux anomaly.' In this paper, global fits are applied to existing IBD yield measurements to produce constraints on antineutrino production by individual plutonium and uranium fission isotopes. We find that fits including measurements from highly 235U-enriched cores and fits including Daya Bay's new fuel evolution result produce discrepant best-fit IBD yields for 235U and 239Pu. This discrepancy can be alleviated in a global analysis of all datasets through simultaneous fitting of 239Pu, 235U, and 238U yields. The measured IBD yield of U238 in this analysis is (7.02 +/- 1.65) x 10^-43 cm2/fission, nearly two standard deviations below existing predictions. Future hypothetical IBD yield measurements by short-baseline reactor experiments are examined to determine their possible impact on global understanding of isotopic IBD yields. It is found that future improved short-baseline IBD yield measurements at both high-enriched and low-enriched cores can significantly improve constraints for 235U, 238U, and 239Pu, providing comparable or superior precision to existing conversion- and summation-based antineutrino flux predictions. Systematic and experimental requirements for these future measurements are also investigated.

    hep-phnucl-exnucl-thPRD(2018)·29 citations
27. 27*

    Spherical harmonics for multiparticle final states

    Keith Pedersen🇺🇸 · Zack Sullivan🇺🇸

    We examine collider physics via the spectral power H_l, which utilizes much more detector information than sequential jet reconstruction. We use H_l to define a novel jet definition and use it to reconstruct both e+e- > qqg and e+e > tt final states. We find that a significant amount of pileup can be trivially subtracted from H_l jets, provided that the "shape" of pileup can be determined ahead of time. Finally, we find that future progress with H_l jets will require the addition of degrees of freedom accounting for jet "shape" (e.g. radial energy distribution). This should allow the measurement of jet shapes using much more information than traditional techniques.

    hep-ph0 citations
28. 28*

    Parametric Resonance in Quantum Electrodynamics Vacuum Birefringence

    Ariel Arza🇨🇱 · Ricardo Gabriel Elias🇨🇱

    Vacuum magnetic birefringence is one of the most interesting non-linear phenomena in quantum electrodynamics because it is a pure photon-photon result of the theory and it directly signalizes the violation of the classical superposition principle of electromagnetic fields in the full quantum theory. We perform analytical and numerical calculations when an electromagnetic wave interacts with an oscillating external magnetic field. We find that in an ideal cavity, when the external field frequency is around the electromagnetic wave frequency, the normal and parallel components of the wave suffer parametric resonance at different rates, producing a vacuum birefringence effect growing in time. We also study the case where there is no cavity and the oscillating magnetic field is spatially localized in a region of length $L$. In both cases we find also a rotation of the elliptical axis.

    hep-phPRD(2018)·7 citations
29. 29*

    Domain walls in the extensions of the Standard Model

    Tomasz Krajewski🇵🇱 · Zygmunt Lalak🇵🇱 · Marek Lewicki🇦🇺 · Paweł Olszewski🇵🇱

    Our main interest is the evolution of domain walls of the Higgs field in the early Universe. The aim of this paper is to understand how dynamics of Higgs domain walls could be influenced by yet unknown interactions from beyond the Standard Model. We assume that the Standard Model is valid up to certain, high, energy scale $\Lambda$ and use the framework of the effective field theory to describe physics below that scale. Performing numerical simulations with different values of the scale $\Lambda$ we are able to extend our previous analysis and determine its range of validity. We study domain walls interpolating between the physical electroweak vacuum and the vacuum appearing at very high field strengths. These domain walls could be formed from non-homogeneous configurations of the Higgs field produced by quantum fluctuations during inflation or thermal fluctuations during reheating. Our numerical simulations show that evolution of Higgs domain walls is rather insensitive to interactions beyond the Standard Model as long as masses of new particles are grater than $10^{12}\text{GeV}$. For lower values of $\Lambda$ the RG improved effective potential is strongly modified at field strengths crucial to the evolution of domain walls. For instance its minima become degenerate for $\Lambda$ around $10^{11}\text{GeV}$. We find that even in the case when the minima of the potential are nearly degenerate Higgs domain walls decayed shortly after their formation for generic initial conditions. On the other hand, in simulations with specifically chosen initial conditions Higgs domain walls can live longer and enter the scaling regime. We also determine the energy spectrum of gravitational waves produced by decaying domain walls of the Higgs field. For generic initial field configurations the amplitude of the signal is too small to be observed in present and planned detectors.

    hep-phastro-ph.COgr-qcJCAP(2018)·12 citations
30. 30*

    What is the Machine Learning?

    Spencer Chang🇺🇸 · Timothy Cohen🇺🇸 · Bryan Ostdiek🇺🇸

    Applications of machine learning tools to problems of physical interest are often criticized for producing sensitivity at the expense of transparency. To address this concern, we explore a data planing procedure for identifying combinations of variables -- aided by physical intuition -- that can discriminate signal from background. Weights are introduced to smooth away the features in a given variable(s). New networks are then trained on this modified data. Observed decreases in sensitivity diagnose the variable's discriminating power. Planing also allows the investigation of the linear versus non-linear nature of the boundaries between signal and background. We demonstrate the efficacy of this approach using a toy example, followed by an application to an idealized heavy resonance scenario at the Large Hadron Collider. By unpacking the information being utilized by these algorithms, this method puts in context what it means for a machine to learn.

    hep-phphysics.data-anstat.MLPRD(2018)·70 citations
31. 31*

    Addendum: New approach to the resummation of logarithms in Higgs-boson decays to a vector quarkonium plus a photon [Phys. Rev. D 95, 054018 (2017)]

    Geoffrey T. Bodwin (Argonne)🇺🇸 · Hee Sok Chung (CERN)🇨🇭 · June-Haak Ee🇰🇷 · Jungil Lee (Korea U.)🇰🇷

    In this addendum to Phys.\ Rev.\ D {\bf 95}, 054018 (2017) we recompute the rates for the decays of the Higgs boson to a vector quarkonium plus a photon, where the vector quarkonium is $J/\psi$, ${\rm Y}(1S)$, ${\rm Y}(2S)$, or ${\rm Y}(3S)$. We correct an error in the Abel-Padé summation formula that was used to carry out the evolution of the quarkonium light-cone distribution amplitude in Phys.\ Rev.\ D {\bf 95}, 054018 (2017). We also correct an error in the scale of quarkonium wave function at the origin in Phys.\ Rev.\ D {\bf 95}, 054018 (2017) and introduce several additional refinements in the calculation.

    hep-phPRD(2017)·22 citations
32. 32*

    No radiative generation of Chern-Simons-like term in Lorentz-violating QED: dealing with IR divergences

    O.M. Del Cima🇧🇷 · D.H.T. Franco🇧🇷 · O. Piguet🇧🇷

    The issue intensively claimed in the literature on the generation of a CPT-odd and Lorentz violating Chern-Simons-like term by radiative corrections owing to a CPT violating interaction -- the axial coupling of fermions with a constant vector field $b_{\text{m}}$ -- is mistaken. The presence of massless gauge field triggers IR divergences that might show up from the UV subtractions, therefore, so as to deal with the (actual physical) IR divergences, the Lowenstein-Zimmermann subtraction scheme, in the framework of BPHZL renormalization method, has to be adopted. The proof on the non generation of such a Chern-Simons-like term is done, independent of any kind of regularization scheme, at all orders in perturbation theory.

    ↳ hep-thhep-phmath-phmath.MP+1JHEP(2017)·2 citations
33. 33*

    Zero-modes on orbifolds : magnetized orbifold models by modular transformation

    Tatsuo Kobayashi🇯🇵 · Satoshi Nagamoto🇯🇵

    We study $T^2/Z_N$ orbifold models with magnetic fluxes. We propose a systematic way to analyze the number of zero-modes and their wavefunctions by use of modular transformation. Our results are consistent with the previous results, and our approach is more direct and analytical than the previous ones. The index theorem implies that the zero-mode number of the Dirac operator on $T^2$ is equal to the index $M$, which corresponds to the magnetic flux in a certain unit. Our results show that the zero-mode number of the Dirac operator on $T^2/Z_N$ is equal to $\lfloor M/N\rfloor +1$ except one case on the $T^2/Z_3$ orbifold.

    ↳ hep-thhep-phmath-phmath.MPPRD(2017)·65 citations
34. 34*

    Off-shell renormalization in Higgs effective field theories

    Daniele Binosi🇮🇹 · Andrea Quadri🇮🇹

    The off-shell one-loop renormalization of a Higgs effective field theory possessing a scalar potential $\sim {\left({\Phi }^{†}\Phi -\frac{v^2}{2}\right)}^N$ with $N$ arbitrary is presented. This is achieved by renormalizing the theory once reformulated in terms of two auxiliary fields $X_{1,2}$, which, due to the invariance under an extended Becchi-Rouet-Stora-Tyutin symmetry, are tightly constrained by functional identities. The latter allow in turn the explicit derivation of the mapping onto the original theory, through which the (divergent) multi-Higgs amplitude are generated in a purely algebraic fashion. We show that, contrary to naive expectations based on the loss of power counting renormalizability, the Higgs field undergoes a linear Standard Model like redefinition, and evaluate the renormalization of the complete set of Higgs self-coupling in the $N\to \infty$ case.

    ↳ hep-thhep-phJHEP(2018)·12 citations
35. 35*

    Probing low-mass vector bosons with parity nonconservation and nuclear anapole moment measurements in atoms and molecules

    V. A. Dzuba🇦🇺 · V. V. Flambaum🇦🇺 · Y. V. Stadnik🇦🇺

    In the presence of P-violating interactions, the exchange of vector bosons between electrons and nucleons induces parity-nonconserving (PNC) effects in atoms and molecules, while the exchange of vector bosons between nucleons induces anapole moments of nuclei. We perform calculations of such vector-mediated PNC effects in Cs, Ba${}^{+}$, Yb, Tl, Fr and Ra${}^{+}$ using the same relativistic many-body approaches as in earlier calculations of standard-model PNC effects, but with the long-range operator of the weak interaction. We calculate nuclear anapole moments due to vector boson exchange using a simple nuclear model. From measured and predicted (within the standard model) values for the PNC amplitudes in Cs, Yb and Tl, as well as the nuclear anapole moment of ${}^{133}$Cs, we constrain the P-violating vector-pseudovector nucleon-electron and nucleon-proton interactions mediated by a generic vector boson of arbitrary mass. Our limits improve on existing bounds from other experiments by many orders of magnitude over a very large range of vector-boson masses.

    ↳ physics.atom-phhep-phnucl-thPRL(2017)·60 citations
36. 36*

    Critical behavior of SU(3) lattice gauge theory with 12 light flavors

    Y. Meurice🇺🇸

    It is expected that when the number of light flavors of gauge theories is increased near or beyond some critical value, new and interesting behavior occurs. We discuss the qualitative properties of the RG flows for a local $SU(3)$ theory with $N_f$ light fundamental flavors for $N_f$ near 12. We discuss the realization of the chiral symmetry and remind that the Wigner mode seems an unlikely alternative. We propose to use a linear sigma model to describe the light $\sigma$ masses found in recent lattice calculations for $N_f$=8 and 12. Progress made after the conference are reported in arXiv:1709.09264, where it is claimed that the breaking of the axial $U(1{)}_A$ is a key ingredient to get a small $\sigma$ mass. For SU(3) lattice gauge theory with 12 flavors of unimproved staggered fermions, the scaling of the imaginary part of the zeros of the partition function in the complex coupling plane is consistent with a first order phase transition for small values of the mass. Zech Gelzer and Diego Floor are investigating the scaling near the endpoint of the line of first order phase transition in the mass-coupling plane where a light and weakly interacting scalar is expected. We briefly discuss recent calculations of the second-order Rényi entanglement entropy and estimations of the central charge using the Tensor Renormalization Group method for the two-dimensional O(2) model and the possibility to extend these calculations to higher dimensions.

    ↳ hep-lathep-phhep-th1 citation
37. 37*

    Back-reaction on background fields: a coherent state approach

    Anton Ilderton🇬🇧 · Daniel Seipt🇬🇧

    There are many situations in which a strong electromagnetic field may be approximated as a fixed background. Going beyond this approximation, i.e. accounting for the back-reaction of quantum process on the field, is however challenging. Here we develop an approach to this problem which is a straightforward extension of background field methods. The approach follows from the observation that scattering in an on-shell background is equivalent to scattering between coherent states; we show that by deforming these states one can model back-reaction. Focussing on intense laser-matter interactions, we provide examples which model beam depletion and, furthermore, introduce an extremisation principle with which to determine the level of depletion in a given scattering process.

    ↳ hep-thhep-phPRD(2018)·44 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.