Mon·Dec 12, 2016Monday·December 12, 2016

1. 01*

   Calculation of Momentum Distribution Function of a Non-thermal Fermionic Dark Matter

   Anirban Biswas🇮🇳 · Aritra Gupta🇮🇳

   The most widely studied scenario in dark matter phenomenology is the thermal WIMP scenario. Inspite of numerous efforts to detect WIMP, till now we have no direct evidence for it. A possible explanation for this non-observation of dark matter could be because of its very feeble interaction strength and hence, failing to thermalise with the rest of the cosmic soup. In other words, the dark matter might be of non-thermal origin where the relic density is obtained by the so-called freeze-in mechanism. Furthermore, if this non-thermal dark matter is itself produced substantially from the decay of another non-thermal mother particle, then their distribution functions may differ in both size and shape from the usual equilibrium distribution function. In this work, we have studied such a non-thermal (fermionic) dark matter scenario in the light of a new type of $U(1{)}_{\mathrm{B}-\mathrm{L}}$ model. The $U(1{)}_{\mathrm{B}-\mathrm{L}}$ model is interesting, since, besides being anomaly free, it can give rise to neutrino mass by Type II see-saw mechanism. Moreover, as we will show, it can accommodate a non-thermal fermionic dark matter as well. Starting from the collision terms, we have calculated the momentum distribution function for the dark matter by solving a coupled system of Boltzmann equations. We then used it to calculate the final relic abundance, as well as other relevant physical quantities. We have also compared our result with that obtained from solving the usual Boltzmann (or rate) equations directly in terms of comoving number density, $Y$. Our findings suggest that the latter approximation is valid only in cases where the system under study is close to equilibrium, and hence should be used with caution.

   hep-phJCAP(2017)·33 citations
2. 02*

   Prospects of models with light sgoldstino in electron beam dump experiment at CERN SPS

   K. O. Astapov🇷🇺 · D. V. Kirpichnikov🇷🇺

   We discuss phenomenology of light scalar sgoldstino in context of CERN electron beam dump experiment NA64. We calculate sgoldstino production rate for this experiment taking into account sgoldstino mixing with the Higgs boson and find a region in the model parameter space which can be tested in NA64.

   hep-ph3 citations
3. 03*

   A Sommerfeld Toolbox for Colored Dark Sectors

   Sonia El Hedri🇩🇪 · Anna Kaminska🇩🇪 · Maikel de Vries🇩🇪

   We present analytical formulae for the Sommerfeld corrections to the annihilation of massive colored particles into quarks and gluons through the strong interaction. These corrections are essential to accurately compute the dark matter relic density for coannihilation with colored partners. Our formulae allow to compute the Sommerfeld effect, not only for the lowest term in the angular momentum expansion of the amplitude, but for all orders in the partial wave expansion. In particular, we carefully account for the effects of the spin of the annihilating particle on the symmetry of the two-particle wave function. This work focuses on strongly interacting particles of arbitrary spin in the triplet, sextet and octet color representations. For typical velocities during freeze-out, we find that including Sommerfeld corrections on the next-to-leading order partial wave leads to modifications of up to ten to twenty percent on the total annihilation cross section. Complementary to QCD, we generalize our results to particles charged under an arbitrary unbroken SU(N) gauge group, as encountered in dark glueball models. In connection with this paper a Mathematica notebook is provided to compute the Sommerfeld corrections for colored particles up to arbitrary order in the angular momentum expansion.

   hep-phEPJC(2017)·46 citations
4. 04*

   Boosted Dark Matter and its implications for the features in IceCube HESE data

   Atri Bhattacharya🇧🇪 · Raj Gandhi🇮🇳 · Aritra Gupta🇮🇳 · Satyanarayan Mukhopadhyay🇺🇸

   We study the implications of the premise that any new, relativistic, highly energetic neutral particle that interacts with quarks and gluons would create cascade-like events in the IceCube (IC) detector. Such events would be observationally indistinguishable from neutral current deep-inelastic scattering events due to neutrinos. Consequently, one reason for deviations, breaks or excesses in the expected astrophysical power-law neutrino spectrum could be the flux of such a particle. Motivated by features in the recent 1347-day IceCube high energy starting event data (HESE), we focus on particular boosted dark matter ($\chi$) related realizations of this premise. Here, $\chi$ is assumed to be much lighter than, and the result of, the slow decay of a massive scalar ($\varphi$) which constitutes a major fraction of the Universe's dark matter. We show that this hypothesis, coupled with a standard power-law astrophysical neutrino flux is capable of providing very good fits to the present data, along with a possible explanation of other features in the HESE sample. These features include a) the paucity of events beyond $\sim 2$ PeV b) a spectral feature resembling a dip or a spectral change in the 400 TeV--1 PeV region and c) an excess in the $50-100$ TeV region. We consider two different boosted DM scenarios, and determine the allowed mass ranges and couplings for four different types of mediators (scalar, pseudoscalar, vector and axial-vector) which could connect the standard and dark sectors. We consider constraints from gamma-ray observations and collider searches. We find that the gamma-ray observations provide the most restrictive constraints, disfavouring the $1\sigma$ allowed parameter space from IC fits, while still being consistent with the $3\sigma$ allowed region. We also test our proposal and its implications against IC's recent six-year through-going muon track data.

   hep-phastro-ph.HEhep-exJCAP(2017)·46 citations
5. 05*

   Precision Measurement of the W-Boson Mass: Theoretical Contributions and Uncertainties

   Carlo Michel Carloni Calame🇮🇹 · Mauro Chiesa🇮🇹 · Homero Martinez🇮🇹 · Guido Montagna🇮🇹 · Oreste Nicrosini🇮🇹 · Fulvio Piccinini🇮🇹 · Alessandro Vicini🇮🇹

   We perform a comprehensive analysis of electroweak, QED and mixed QCD-electroweak corrections underlying the precise measurement of the W-boson mass M_W at hadron colliders. By applying a template fitting technique, we detail the impact on M_W of next-to-leading order electroweak and QCD corrections, multiple photon emission, lepton pair radiation and factorizable QCD-electroweak contributions. As a by-product, we provide an up-to-date estimate of the main theoretical uncertainties of perturbative nature. Our results can serve as a guideline for the assessment of the theoretical systematics at the Tevatron and LHC and allow a more robust precision measurement of the W-boson mass at hadron colliders.

   hep-phhep-exPRD(2017)·72 citations
6. 06*

   Examining the origin of dark matter mass at colliders

   Minho Kim🇰🇷 · Hye-Sung Lee🇰🇷 · Myeonghun Park🇰🇷 · Mengchao Zhang🇰🇷

   As conventional dark matter scenarios have been probed extensively so far, the physics of a light dark matter charged under a new gauge group (dark gauge group) becomes one of new research avenues in many theoretical and experimental studies. We examine properties of a dark photon showering, the radiation process of light gauge bosons from energetic dark matter particles produced at the Large Hadron Collider (LHC). This showering process provides different signatures at the LHC depending on the property of dark matter under the dark gauge group. We show that the LHC experiment can identify the chirality of a dark matter, which leads to understanding the mass origin of particles in the dark sector.

   hep-phhep-exPRD(2018)·23 citations
7. 07*

   Theoretical Origin of CP violation in the FCNC-free 2HDM and Its Extensions to the Standard Model and 3HDM

   Chilong Lin🇹🇼

   In this manuscript, a general FCNC-free and CP-violating pattern of quark-mass matrices in the 2HDM derived in our previous investigations is revised. This revised pattern is to be diagonalized analytically with no symmetries imposed. The unitary transformation matrices thus derived depend on only two parameters in each quark type and subsequently lead to a CKM matrix which depends on at most four parameters. The fitting of theoretically derived CKM elements and their corresponding empirical values are as good as $\mathbf{O}(10^{-2})$ at tree-level. In a phenomenological way which imposes several fine-tuning parameters into the CKM matrix suitably, the fitting is further improved to $\mathbf{O}(10^{-4})$. After the derivation, we find this hypothesis also applies to the Standard Model and even a model with three Higgs doublets. This will be a big progress in the derivation of a theoretical origin of CP violation.

   hep-ph0 citations
8. 08*

   Power Corrections in the N-jettiness Subtraction Scheme

   Radja Boughezal🇺🇸 · Xiaohui Liu🇺🇸 · Frank Petriello🇺🇸

   We discuss the leading-logarithmic power corrections in the $N$-jettiness subtraction scheme for higher-order perturbative QCD calculations. We compute the next-to-leading order power corrections for an arbitrary $N$-jet process, and we explicitly calculate the power correction through next-to-next-to-leading order for color-singlet production for both $q\bar{q}$ and $gg$ initiated processes. Our results are compact and simple to implement numerically. Including the leading power correction in the $N$-jettiness subtraction scheme substantially improves its numerical efficiency. We discuss what features of our techniques extend to processes containing final-state jets.

   hep-phJHEP(2017)·126 citations
9. 09*

   Neutrinoless double beta decay and neutrino mass

   J.D. Vergados (University of Ioannina, Ioannina, Greece)🇰🇷 · H. Ejiri (RCNP, Osaka University, Osaka, Japan)🇯🇵 · F Šimkovic (Laboratory of Theoretical Physics, JINR, Dubna, Moscow Russia)🇸🇰

   The observation of neutrinoless double beta decay will have important consequences. First it will signal that lepton number is not conserved and the neutrinos are Majorana particles. Second, it represents our best hope for determining the absolute neutrino mass scale at the level of a few tens of meV. To achieve the last goal, however, certain hurdles have to be overcome involving particle, nuclear and experimental physics. Particle physics is important since it provides the mechanisms for neutrinoless double beta decay. In this review we emphasize the light neutrino mass mechanism. Nuclear physics is important for extracting the useful information from the data. One must accurately evaluate the relevant nuclear matrix elements, a formidable task. To this end, we review the recently developed sophisticated nuclear structure approaches, employing different methods and techniques of calculation. We also examine the question of quenching of the axial vector coupling constant, which may have important consequences on the size of the nuclear matrix elements. From an experimental point of view it is challenging, since the life times are extremely long and one has to fight against formidable backgrounds. One needs large isotopically enriched sources and detectors with good energy resolution and very low background.

   hep-phIJMPE(2016)·225 citations
10. 10*

    Master formulas for the dressed scalar propagator in a constant field

    Aftab Ahmad🇲🇽 · Naser Ahmadiniaz🇰🇷 · Olindo Corradini🇮🇹 · Sang Pyo Kim🇰🇷 · Christian Schubert🇲🇽

    The worldline formalism has previously been used for deriving compact master formulas for the one-loop N-photon amplitudes in both scalar and spinor QED, and in the vacuum as well as in a constant external field. For scalar QED, there is also an analogous master formula for the propagator dressed with N photons in the vacuum. Here, we extend this master formula to include a constant field. The two-photon case is worked out explicitly, yielding an integral representation for the Compton scattering cross section in the field suitable for numerical integration in the full range of electric and magnetic field strengths.

    hep-phhep-thNPB(2017)·31 citations
11. 11*

    Drell-Yan hadron tensor: contour gauge and gluon propagator

    I.V. Anikin🇷🇺 · I.O. Cherednikov🇧🇪 · O.V. Teryaev🇷🇺

    We consider the gauge invariant Drell-Yan hadron tensor which includes the standard and non-standard diagram contributions. The non-standard diagram contribution is appeared owing to the complexity of the twist three $B^V(x_1,x_2)$-function where the gluon pole manifests. We use the contour gauge conception which allows us to fix easily the spurious uncertainties in the gluon propagator. The contour gauge condition is generated by the corresponding Wilson lines in both the standard and non-standard diagrams. We demonstrate the substantial role of the non-standard diagram for forming of the relevant contour in the Wilson path-ordered exponential that leads to the spurious singularity fixing.

    hep-phPRD(2017)·8 citations
12. 12*

    FIMP and Muon ($g-2$) in a U$(1{)}_{L_{\mu }-L_{\tau }}$ Model

    Anirban Biswas🇮🇳 · Sandhya Choubey🇮🇳 · Sarif Khan🇮🇳

    The tightening of the constraints on the standard thermal WIMP scenario has forced physicists to propose alternative dark matter (DM) models. One of the most popular alternate explanations of the origin of DM is the non-thermal production of DM via freeze-in. In this scenario the DM never attains thermal equilibrium with the thermal soup because of its feeble coupling strength ($\sim 10^{-12}$) with the other particles in the thermal bath and is generally called the Feebly Interacting Massive Particle (FIMP). In this work, we present a gauged U(1)${}_{L_{\mu }-L_{\tau }}$ extension of the Standard Model (SM) which has a scalar FIMP DM candidate and can consistently explain the DM relic density bound. In addition, the spontaneous breaking of the U(1)${}_{L_{\mu }-L_{\tau }}$ gauge symmetry gives an extra massive neutral gauge boson $Z_{\mu \tau }$ which can explain the muon ($g-2$) data through its additional one-loop contribution to the process. Lastly, presence of three right-handed neutrinos enable the model to successfully explain the small neutrino masses via the Type-I seesaw mechanism. The presence of the spontaneously broken U(1)${}_{L_{\mu }-L_{\tau }}$ gives a particular structure to the light neutrino mass matrix which can explain the peculiar mixing pattern of the light neutrinos.

    hep-phJHEP(2017)·74 citations
13. 13*

    Nucleon tomography. What can we do better today than Rutherford 100 years ago?

    N. G. Stefanis🇩🇪 · Constantia Alexandrou🇨🇾 · Tanja Horn🇺🇸 · Hervé Moutarde🇫🇷 · Ignazio Scimemi🇪🇸

    A survey is presented on the current status of 3D nucleon tomography. Several research frontiers are addressed that dominate modern physics from theory to current and future experiments. We have now a much more detailed spatial image of the nucleon thanks to various theoretical concepts and methods to describe its charge distribution and spin decomposition which are highlighted here. The progress of lattice computations of these quantities is reported and the prospects of what we can come to expect in the near future are discussed. Multi-dimensional maps of the nucleon's partonic structure appear now within reach of forthcoming experiments.

    hep-phEPJ Web Conf.(2017)·6 citations
14. 14*

    Indirect Signals from Solar Dark Matter Annihilation to Long-lived Right-handed Neutrinos

    Rouzbeh Allahverdi🇺🇸 · Yu Gao🇺🇸 · Bradley Knockel🇺🇸 · Shashank Shalgar🇺🇸

    We study indirect detection signals from solar annihilation of dark matter (DM) particles into light right-handed (RH) neutrinos with a mass in a $1-5$ GeV range. These RH neutrinos can have a sufficiently long lifetime to allow them to decay outside the Sun and their delayed decays can result in a signal in gamma rays from the otherwise `dark' solar direction, and also a neutrino signal that is not suppressed by the interactions with solar medium. We find that the latest Fermi-LAT and IceCube results place limits on the gamma ray and neutrino signals, respectively. Combined photon and neutrino bounds can constrain the spin-independent DM-nucleon elastic scattering cross section better than direct detection experiments for DM masses from 200 GeV up to several TeV. The bounds on spin-dependent scattering are also much tighter than the strongest limits from direct detection experiments.

    hep-phastro-ph.HEPRD(2017)·54 citations
15. 15*

    Discriminating Z' signals in semileptonic top pair production at the LHC

    Lucio Cerrito🇮🇹 · Declan Millar🇬🇧 · Stefano Moretti🇬🇧 · Francesco Spanò🇬🇧

    We investigate the sensitivity of top pair production to the properties of different Beyond the Standard Model theories embedding a new neutral boson. We include six-fermion decay, and account for the full tree-level Standard Model ttbar interference, with all intermediate particles allowed off-shell. We focus on those observables best suited to the lepton-plus-jets final state at the LHC, and simulate the resulting experimental conditions, including kinematic requirements and top quark pair reconstruction in the presence of missing transverse energy and combinatorial ambiguity in quark-top assignment. In particular, we demonstrate the use of asymmetry observables to probe the coupling structure of a new neutral resonance, in addition to cases in which these asymmetries may even form complementary discovery observables in combination with the differential cross section.

    hep-ph1 citation
16. 16*

    The 1-loop correction of the QCD energy momentum tensor with the overlap fermion and HYP smeared Iwasaki gluon

    Yi-Bo Yang🇺🇸 · Michael Glatzmaier🇺🇸 · Keh-Fei Liu🇺🇸 · Yong Zhao🇺🇸

    We present the 1-loop renormalization of the energy momentum tensor using the overlap fermion and a HYP-smeared Iwasaki gauge action. We also calculate the 1-loop matching coefficient that convert the lattice simulation results renormalized in the RI/MOM scheme to the $\overline{\text{MS}}$ scheme. The dependence of the renormalization on the gauge action and the number of HYP smearing steps are also investigated.

    ↳ nucl-thhep-lathep-ph15 citations
17. 17*

    Probing cold nuclear matter effects with weak gauge boson production in ultra-relativistic heavy-ion collisions

    Peng Ru🇨🇳 · Ben-Wei Zhang🇨🇳

    Within the framework of pQCD, we systematically study the $W^{\pm }/Z^0$ boson production as a probe of cold nuclear matter effects and nuclear parton distributions in p+Pb and Pb+Pb collisions at the LHC and future colliders. A detailed analysis at partonic level is performed. Moreover, with a semi-microscopic KP model of NPDFs, in which several nuclear effects (e.g. Fermi motion and nuclear binding, the off-shell correction, the nuclear coherent correction, and the nuclear meson correction) are included, we study the vector boson rapidity distribution in p+Pb collisions at the LHC, and a very good agreement with the latest data is found, including the $W$-boson charge asymmetry.

    ↳ nucl-thhep-phnucl-exNucl.Part.Phys.Proc.(2017)·2 citations
18. 18*

    The $\rho$-meson light-cone distribution amplitudes from lattice QCD

    Vladimir M. Braun (1)🇩🇪 · Peter C. Bruns (1)🇩🇪 · Sara Collins (1)🇩🇪 · John A. Gracey (2)🇬🇧 · Michael Gruber (1)🇩🇪 · Meinulf Göckeler (1)🇩🇪 · Fabian Hutzler (1)🇩🇪 · Paula Pérez-Rubio (1)🇩🇪 · Andreas Schäfer (1)🇩🇪 · Wolfgang Söldner (1)🇩🇪 · André Sternbeck (3)🇩🇪 · Philipp Wein (1) ((1) Universität Regensburg, (2) University of Liverpool, (3) Friedrich-Schiller-Universität Jena)🇩🇪

    We present the results of a lattice study of the normalization constants and second moments of the light-cone distribution amplitudes of longitudinally and transversely polarized $\rho$ mesons. The calculation is performed using two flavors of dynamical clover fermions at lattice spacings between $0.060\text{fm}$ and $0.081\text{fm}$, different lattice volumes up to $m_{\pi }L=6.7$ and pion masses down to $m_{\pi }=150\text{MeV}$. Bare lattice results are renormalized non-perturbatively using a variant of the RI'-MOM scheme and converted to the $\overline{\text{MS}}$ scheme. The necessary conversion coefficients, which are not available in the literature, are calculated. The chiral extrapolation for the relevant decay constants is worked out in detail. We obtain for the ratio of the tensor and vector coupling constants $f_{\rho }^T/f_{\rho }^{}=0.629(8)$ and the values of the second Gegenbauer moments $a_2^{\parallel }=0.132(27)$ and $a_2^{\perp }=0.101(22)$ at the scale $\mu =2\text{GeV}$ for the longitudinally and transversely polarized $\rho$ mesons, respectively. The errors include the statistical uncertainty and estimates of the systematics arising from renormalization. Discretization errors cannot be estimated reliably and are not included. In this calculation the possibility of $\rho \to \pi \pi$ decay at the smaller pion masses is not taken into account.

    ↳ hep-lathep-phJHEP(2017)·57 citations
19. 19*

    Spectral properties of $\rho$ meson in a magnetic field

    Snigdha Ghosh🇮🇳 · Arghya Mukherjee🇮🇳 · Mahatsab Mandal🇮🇳 · Sourav Sarkar🇮🇳 · Pradip Roy🇮🇳

    We calculate the rho meson mass in a weak magnetic field using effective $\rho \pi \pi$ interaction. It is seen that both ${\rho }^0$ and ${\rho }^{\pm }$ masses decrease with the magnetic field in vacuum. $\rho$ meson dispersion relation has been calculated and shown to be different for ${\rho }^0$ and ${\rho }^{\pm }$. We also calculate the $\rho \pi \pi$ decay width and spectral functions of ${\rho }^0$ and ${\rho }^{\pm }$. The width is seen to decrease with $eB$ and the spectral functions become narrower.

    ↳ nucl-thhep-phPRD(2016)·49 citations
20. 20*

    Universal scaling of unequal-time correlation functions in ultracold Bose gases far from equilibrium

    A. Schachner🇩🇪 · A. Piñeiro Orioli🇩🇪 · J. Berges🇩🇪

    We explore the far-from-equilibrium dynamics of Bose gases in a universal regime associated to nonthermal fixed points. While previous investigations concentrated on scaling functions and exponents describing equal-time correlations, we compute the additional scaling functions and dynamic exponent $z$ characterizing the frequency dependence or dispersion from unequal-time correlations. This allows us to compare the characteristic condensation and correlation times from a finite-size scaling analysis depending on the system's volume.

    ↳ cond-mat.quant-gascond-mat.stat-mechhep-phPRA(2017)·27 citations
21. 21*

    Gauge hierarchy problem in asymptotically safe gravity--the resurgence mechanism

    Christof Wetterich🇩🇪 · Masatoshi Yamada🇩🇪

    The gauge hierarchy problem could find a solution within the scenario of asymptotic safety for quantum gravity. We discuss a "resurgence mechanism" where the running dimensionless coupling responsible for the Higgs scalar mass first decreases in the ultraviolet regime and subsequently increases in the infrared regime. A gravity induced large anomalous dimension plays a crucial role for the required "self-tuned criticality" in the ultraviolet regime beyond the Planck scale.

    ↳ hep-thgr-qchep-phPLB(2017)·85 citations
22. 22*

    Polarized ${}^3$He target and final state interactions in SiDIS

    Alessio Del Dotto🇮🇹 · Leonid Kaptari🇷🇺 · Emanuele Pace🇮🇹 · Giovanni Salmè🇮🇹 · Sergio Scopetta🇮🇹

    Jefferson Lab (JLab) is starting a wide experimental program aimed at studying the neutron's structure, with a great emphasis on the extraction of the parton transverse-momentum distributions (TMDs). To this end, Semi-inclusive deep-inelastic scattering (SiDIS) experiments on polarized ${}^3$He will be carried out, providing, together with proton and deuteron data, a sound flavor decomposition of the TMDs. Given the expected high statistical accuracy, it is crucial to disentangle nuclear and partonic degrees of freedom to get an accurate theoretical description of both initial and final states. In this contribution, a preliminary study of the Final State Interaction (FSI) in the standard SiDIS, where a pion (or a Kaon) is detected in the final state is presented, in view of constructing a realistic description of the nuclear initial and final states.

    ↳ nucl-thhep-exhep-phFew Body Syst.(2017)·2 citations
23. 23*

    Strangeness production in high-energy collisions and Hawking-Unruh radiation

    Abdel Nasser Tawfik (Egyptian Ctr. Theor. Phys., Cairo, WLCAPP, Cairo)🇪🇬 · Hayam Yassin🇪🇬 · Eman R. Abo Elyazeed (Ain Shams U., Cairo)🇪🇬

    The assumption that the production of quark-antiquark pairs and their sequential string-breaking taking place through the event horizon of the color confinement determines freezeout temperature and gives a plausible interpretation of the thermal pattern of pp and AA collisions. When relating the black-hole electric charges to the baryon-chemical potentials it was found that the phenomenologically-deduced parameters from various particle ratios in the statistical thermal models agree well with the ones determined from the thermal radiation from charged black-hole. Accordingly, the resulting freezeout conditions, such as $s/T^3=7$ and $<E>/<N>=1$GeV, are confirmed at finite chemical potentials, as well. Furthermore, the problematic of strangeness production in elementary collisions can be interpreted by thermal particle production from the Hawking-Unruh radiation. Consequently, the freezeout temperature depends on the quark masses. This leads to a deviation from full equilibrium and thus a suppression of the strangeness production in the elementary collisions. But in nucleus-nucleus collisions, an average temperature should be introduced in order to dilute the quark masses. This nearly removes the strangeness suppression. An extension to finite chemical potentials is introduced. The particle ratios of kaon-to-pion, phi-to-kaon and antilambda-to-pion are determined from Hawking-Unruh radiation and compared with the thermal calculations and the measurements in different experiments. We conclude that these particle ratios can be reproduced, at least qualitatively, as Hawking-Unruh radiation at finite chemical potential. With increasing energy, both K+/pi+ and phi/K^- keep their maximum values at low SPS energies. But the further energy decrease rapidly reduces both ratios. For Lambda/pi-, there is an increase with increasing collision energy, i.e. no saturation is to be observed.

    ↳ physics.gen-phhep-phIJMPE(2017)·7 citations
24. 24*

    On electrodynamics of chiral matter

    Zebin Qiu🇨🇳 · Gaoqing Cao🇨🇳 · Xu-Guang Huang🇨🇳

    Many-body systems with chiral fermions can exhibit novel transport phenomena that violate parity and time reversal symmetries, such as the chiral magnetic effect, the anomalous Hall effect, and the anomalous generation of charge. Based on the Maxwell-Chern-Simons electrodynamics, we examine some electromagnetic and optical properties of such systems including the electrostatics, the magnetostatics, the propagation of electromagnetic waves, the novel optical effects, etc.

    ↳ cond-mat.mes-hallhep-phnucl-thphysics.plasm-phPRD(2017)·74 citations
25. 25*

    Strong-Field Breit-Wheeler Pair Production in Two Consecutive Laser Pulses with Variable Time Delay

    Martin J. A. Jansen🇩🇪 · Carsten Müller🇩🇪

    Photoproduction of electron-positron pairs by the strong-field Breit-Wheeler process in an intense laser field is studied. The laser field is assumed to consist of two consecutive short pulses, with a variable time delay in between. By numerical calculations within the framework of scalar quantum electrodynamics, we demonstrate that the time delay exerts a strong impact on the pair-creation probability. For the case when both pulses are identical, the effect is traced back to the relative quantum phase of the interfering S-matrix amplitudes and explained within a simplified analytical model. Conversely, when the two laser pulses differ from each other, the pair-creation probability depends not only on the time delay but, in general, also on the temporal order of the pulses.

    ↳ quant-phhep-phPLB(2017)·26 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.