Wed·Oct 10, 2018Wednesday·October 10, 2018

1. 01*

   Leveraging the ALICE/L3 cavern for long-lived exotics

   Vladimir V. Gligorov🇫🇷 · Simon Knapen🇺🇸 · Benjamin Nachman🇺🇸 · Michele Papucci🇺🇸 · Dean J. Robinson🇺🇸

   Run 5 of the HL-LHC era (and beyond) may provide new opportunities to search for physics beyond the standard model (BSM) at interaction point 2 (IP2). In particular, taking advantage of the existing ALICE detector and infrastructure provides an opportunity to search for displaced decays of beyond standard model long-lived particles (LLPs). While this proposal may well be preempted by ongoing ALICE physics goals, examination of its potential new physics reach provides a compelling comparison with respect to other LLP proposals. In particular, full event reconstruction and particle identification could be possible by making use of the existing L3 magnet and ALICE time projection chamber. For several well-motivated portals, the reach competes with or exceeds the sensitivity of MATHUSLA and SHiP, provided that a total integrated luminosity of approximately $100{\text{fb}}^{-1}$ could be delivered to IP2.

   hep-phhep-exPRD(2019)·94 citations
2. 02*

   Towards Ultimate Parton Distributions at the High-Luminosity LHC

   Rabah Abdul Khalek🇳🇱 · Shaun Bailey🇬🇧 · Jun Gao🇨🇳 · Lucian Harland-Lang🇬🇧 · Juan Rojo🇳🇱

   Since its start of data taking, the LHC has provided an impressive wealth of information on the quark and gluon structure of the proton. Indeed, modern global analyses of parton distribution functions (PDFs) include a wide range of LHC measurements of processes such as the production of jets, electroweak gauge bosons, and top quark pairs. In this work, we assess the ultimate constraining power of LHC data on the PDFs that can be expected from the complete dataset, in particular after the High-Luminosity (HL) phase, starting in around 2025. The huge statistics of the HL-LHC, delivering $\mathcal{L}=3$ ab${}^{-1}$ to ATLAS and CMS and $\mathcal{L}=0.3$ ab${}^{-1}$ to LHCb, will lead to an extension of the kinematic coverage of PDF-sensitive measurements as well as to an improvement in their statistical and systematic uncertainties. Here we generate HL-LHC pseudo-data for different projections of the experimental uncertainties, and then quantify the resulting constraints on the PDF4LHC15 set by means of the Hessian profiling method. We find that HL-LHC measurements can reduce PDF uncertainties by up to a factor of 2 to 4 in comparison to state-of-the-art fits, leading to few-percent uncertainties for important observables such as the Higgs boson transverse momentum distribution via gluon-fusion. Our results illustrate the significant improvement in the precision of PDF fits achievable from hadron collider data alone, and motivate the continuation of the ongoing successful program of PDF-sensitive measurements by the LHC collaborations.

   hep-phhep-exEPJC(2018)·98 citations
3. 03*

   TeV scale leptogenesis, inflaton dark matter and neutrino mass in a scotogenic model

   Debasish Borah🇮🇳 · P. S. Bhupal Dev🇺🇸 · Abhass Kumar🇮🇳

   We consider the scotogenic model, where the standard model (SM) is extended by a scalar doublet and three $Z_2$ odd SM-singlet fermions ($N_i$, $i=1,2,3$), all odd under an additional $Z_2$ symmetry, as a unifying framework for simultaneous explanation of inflation, dark matter, baryogenesis and neutrino mass. The inert doublet is coupled nonminimally to gravity and forms the inflaton. The lightest neutral particle of this doublet later becomes the dark matter candidate. Baryogenesis is achieved via leptogenesis by the decay of $N_1$ to SM leptons and the inert doublet particles. Neutrino masses are generated at the one-loop level. Explaining all these phenomena together in one model is very economic and gives us a new set of constraints on the model parameters. We calculate the inflationary parameters like spectral index, tensor-to-scalar ratio and scalar power spectrum, and find them to be consistent with the Planck 2018 constraints. We also do the reheating analysis for the inert doublet decays/annihilations to relativistic, SM particles. We find that the observed baryon asymmetry of the Universe can be obtained and the sum of light neutrino mass bound can be satisfied for the lightest $Z_2$ odd singlet fermion of mass around 10 TeV, dark matter in the mass range 1.25--1.60 TeV, and the lepton number violating quartic coupling between the SM Higgs and the inert doublet in the range of $6.5\times 10^{-5}$ to $7.2\times 10^{-5}$.

   hep-phastro-ph.COPRD(2019)·97 citations
4. 04*

   Proton's Electromagnetic Form Factors from a Non-Power Confinement Potential

   M. Kirchbach🇲🇽 · C.B.Compean🇲🇽

   The electric-charge, and magnetic-dipole form factors of the proton are calculated from an underlying constituent quark picture of hadron structure based on a potential shaped after a cotangent function, which has the properties of being both conformally symmetric and color confining, finding adequate reproduction of a variety of related data.

   hep-phNPA(2018)·5 citations
5. 05*

   Dispersive analysis of the $\gamma {\gamma }^{\ast }\to \pi \pi$ process

   Igor Danilkin🇩🇪 · Marc Vanderhaeghen🇩🇪

   We present a theoretical study of the $\gamma {\gamma }^{\ast }\to {\pi }^{+}{\pi }^{-},{\pi }^0{\pi }^0$ processes from the threshold through the $f_2(1270)$ region in the $\pi \pi$ invariant mass. We adopt the Omnès representation in order to account for rescattering effects in both s- and d-partial waves. For the description of the $f_0(980)$ resonance, we implement a coupled-channel unitarity. The constructed amplitudes serve as an essential framework to interpret the current experimental two-photon fusion program at BESIII. They also provide an important input for the dispersive analyses of the hadronic light-by-light scattering contribution to the muon's anomalous magnetic moment.

   hep-phPLB(2019)·78 citations
6. 06*

   Gravity safe, electroweak natural axionic solution to strong CP and SUSY mu problems

   Howard Baer🇺🇸 · Vernon Barger🇺🇸 · Dibyashree Sengupta🇺🇸

   Particle physics models with Peccei-Quinn (PQ) symmetry breaking as a consequence of supersymmetry (SUSY) breaking are attractive in that they solve the strong CP problem with a SUSY DFSZ-like axion, link the SUSY breaking and PQ breaking intermediate mass scales and can resolve the SUSY mu problem with a naturalness-required weak scale mu term whilst soft SUSY breaking terms inhabit the multi-TeV regime as required by LHC sparticle mass limits and the Higgs mass measurement. On the negative ledger, models based on global symmetries suffer a generic gravity spoliation problem. We present a model based on the discrete R-symmetry Z_{24}^R-- which may emerge from compactification of 10-d Lorentzian spacetime in string theory-- where the mu term and dangerous proton decay and R-parity violating operators are either suppressed or forbidden while a gravity-safe PQ symmetry emerges as an accidental approximate global symmetry leading to a solution to the strong CP problem and a weak-scale/natural value for the mu term.

   hep-phastro-ph.COhep-thPLB(2019)·46 citations
7. 07*

   Photon enhancement in a homogeneous axion dark matter background

   Ariel Arza🇺🇸

   We study the propagation of photons in a homogeneous axion dark matter background. When the axion decay into two photons is stimulated, the photon field exhibits a parametric instability in a small bandwidth centered on one half of the axion mass. We estimate analytically the enhancement for both coherent and non-coherent axion fields and we find that this effect could be relevant in the context of miniclusters and galactic halos.

   hep-phastro-ph.GAEPJC(2019)·47 citations
8. 08*

   Resummation of High Order Corrections in $Z$ Boson Plus Jet Production at the LHC

   Peng Sun🇨🇳 · Bin Yan🇺🇸 · C.-P. Yuan🇺🇸 · Feng Yuan🇺🇸

   We study the multiple soft gluon radiation effects in $Z$ boson plus jet production at the LHC. By applying the transverse momentum dependent factorization formalism, the large logarithms introduced by the small total transverse momentum of the $Z$ boson plus jet final state system, are resummed to all orders in the expansion of the strong interaction coupling at the accuracy of Next-to-Leading Logarithm(NLL). We also compare the prediction of our resummation calculation to the CMS data by employing a reweighting procedure to estimate the effect from imposing kinematic cuts on the leptons from $Z$ boson decay, and find good agreement for both the imbalance transverse momentum and the azimuthal angle correlation of the final state $Z$ boson and jet system, for $pp\to Z+jet$ production at the LHC.

   hep-phPRD(2019)·37 citations
9. 09*

   Production of semi-inclusive doubly heavy baryons via top-quark decays

   Juan-Juan Niu🇨🇳 · Lei Guo🇨🇳 · Hong-Hao Ma🇧🇷 · Xing-Gang Wu🇨🇳 · Xu-Chang Zheng🇨🇳

   In the paper, we present a detailed discussion on the semi-inclusive production of doubly heavy baryons (${\Xi }_{bc}$ and ${\Xi }_{bb}$) through top-quark decay channel, $t\to {\Xi }_{b{Q}^{\prime }}+\overline{Q^{\prime }}+W^{+}$, within the framework of non-relativistic QCD (NRQCD). In our calculations, the contributions from the intermediate diquark states, $⟨bc⟩{[}^3{S}_1{]}_{\bar{3}/6}$, $⟨bc⟩{[}^1{S}_0{]}_{\bar{3}/6}$, $⟨bb⟩{[}^1{S}_0{]}_6$ and $⟨bb⟩{[}^3{S}_1{]}_{\bar{3}}$, have been taken into consideration. Main uncertainties from the heavy quark mass $(m_c,m_b\text{mbox}or{m}_t)$, the renormalization scale ${\mu }_r$, and the nonperturbative transition probability have been estimated. For a comparison, we also analyze the production of doubly heavy baryons under the approximate fragmentation function approach. Estimated at the LHC or a High Luminosity LHC with $\mathcal{L}$ =$10^{34-36}{\mathrm{cm}}^{-2}{\mathrm{s}}^{-1}$, there will be about $2.25\times 10^{4-6}$ events of ${\Xi }_{bc}$ and $9.49\times 10^{2-4}$ events of ${\Xi }_{bb}$ produced in one operation year through top-quark decays.

   hep-phPRD(2018)·25 citations
10. 10*

    Spontaneous CP-violation in the Simplest Little Higgs Model

    Ying-nan Mao🇹🇼

    We proposed how spontaneous CP-violation can be generated in the simplest little Higgs model in this talk. Comparing with the original paper, both formalism and phenomenology are updated. The model is still alive facing the collider and electric dipole moment (EDM) measurements. Strictest constraint comes from LHC $Z^{\prime }$ direct search, which leads to $f\gtrsim 8\text{TeV}$. Higgs measurements also set strict constraint on the scalar mixing angle, if the Higgs rare decay channel is open. EDM measurements still set weak constraints for this model, even after the recent ACME updated measurement on electron's EDM. In this talk, we also discussed the test of CP-violation in the scalar sector, through the interactions between scalars and gauge bosons.

    hep-phPoS(2019)·2 citations
11. 11*

    Constraining Neutrino Lifetimes and Magnetic Moments via Solar Neutrinos in the Large Xenon Detectors

    Guo-yuan Huang🇨🇳 · Shun Zhou🇨🇳

    The multi-ton-scale liquid xenon detectors, with an excellent energy resolution of a few keV, will be constructed to probe the dark-matter particles. In this paper, we show that precision measurements of the low-energy solar neutrinos via the elastic neutrino-electron scattering in this kind of detectors are able to improve the present limits on neutrino lifetimes and neutrino magnetic moments by about one order of magnitude. We carefully study the impact of the unknown neutrino mass spectrum on the ultimate limits in the case of non-radiative visible neutrino decays. In the case of invisible neutrino decays, the lower bounds ${\tau }_1^{}/m_1^{}\gtrsim 3\times 10^{-2}\mathrm{s}/\mathrm{eV}$ and ${\tau }_2^{}/m_2^{}\gtrsim 8\times 10^{-3}\mathrm{s}/\mathrm{eV}$ at the $2\sigma$ level can be obtained for a total exposure of $70\mathrm{ton}\cdot \mathrm{year}$. Furthermore, a restrictive constraint on the effective magnetic moment of neutrinos ${\mu }_{\mathrm{eff}}^{}\lesssim 2.6\times 10^{-12}{\mu }_{\mathrm{B}}^{}$, with ${\mu }_{\mathrm{B}}^{}$ being the Bohr magneton, can be achieved. This is among the best results that will be available in the laboratory experiments in the near future.

    hep-phastro-ph.SRJCAP(2019)·37 citations
12. 12*

    Multileptonic signals of co-annihilating left-right supersymmetric dark matter

    Arindam Chatterjee🇮🇳 · Mariana Frank🇨🇦 · Benjamin Fuks🇫🇷 · Katri Huitu🇫🇮 · Subhadeep Mondal🇫🇮 · Santosh Kumar Rai🇮🇳 · Harri Waltari🇫🇮

    We perform a comprehensive dark matter analysis of left-right supersymmetric scenarios that includes constraints from dark matter direct and indirect detection experiments and that presents distinctive features from those available in minimal supersymmetry. We concentrate on dark matter candidates which, while satisfying all constraints, are different from those of the minimal supersymmetric standard model. We consider in our analysis all possible co-annihilation channels relevant for setups in which several states are light and nearly degenerate, and devise a set of representative benchmark points, requiring co-annihilations, which satisfy all restrictions. We then study their consequent LHC signals, which exhibit promising new multileptonic signatures involving $W_R$, that if observed, would provide a strong support for left-right supersymmetry.

    hep-phPRD(2019)·11 citations
13. 13*

    Meson cloud effects on kaon quark distribution functions and the SU(3) flavor symmetry

    Akira Watanabe🇨🇳 · Takahiro Sawada🇯🇵 · Chung Wen Kao🇹🇼

    We present our analysis on the valence quark distribution functions of the $K^{+}$ meson, $v^{K(u)}(x,Q^2)$ and $v^{K(\bar{s})}(x,Q^2)$, taking into account the meson cloud effects in the framework of the chiral constituent quark model. Assuming appropriate bare quark distribution functions at the initial scale, evaluating the Goldstone boson dressing corrections with the model, and performing the QCD evolution, one can obtain the realistic dressed distributions at a certain scale. The phenomenologically satisfactory valence quark distribution of the pion was obtained in the previous study and there are available experimental data of the valence $u$ quark distribution ratio $v^{K(u)}(x,Q^2)/v^{\pi (u)}(x,Q^2)$, which enable us to obtain the kaon quark distribution functions. Besides presenting the resulting dressed distributions, we also show how the meson cloud effects affect the bare distributions in detail. A striking result is that the observed size of the SU(3) flavor symmetry breaking is considerably smaller than those seen in the preceding works based on other approaches.

    hep-phnucl-thNucl.Part.Phys.Proc.(2018)·3 citations
14. 14*

    Off-shell initial state effects, gauge invariance and angular distributions in the Drell-Yan process

    Maxim Nefedov🇷🇺 · Vladimir Saleev🇩🇪

    We discuss production of Drell-Yan lepton pairs at hadron colliders in the framework of the parton Reggeization approach, which includes off-shell initial state effects in a gauge-invariant way. Other possible prescriptions to restore gauge-invariance of hard-scattering coefficient with off-shell initial-state partons are also investigated and significant differences for the resulting structure functions are found, especially for the $F_{UU}^{(\cos 2\varphi )}$. We compare our numerical results for $q_T$-spectra of the lepton pair with experimental data, obtained by E-288 collaboration ($\sqrt{S}=19.4$ and 23.8 GeV) and find a good agreement. Also we perform predictions for the Drell-Yan structure functions at NICA $pp$-collider ($\sqrt{S}=24$ GeV).

    hep-phPLB(2019)·17 citations
15. 15*

    Productions of $f_1(1420)$ in pion and kaon induced reactions

    Xiao-Yun Wang🇨🇳 · Jun He🇨🇳 · Quanjin Wang🇨🇳 · Hao Xu🇨🇳

    The $f_1(1420)$ productions via pion and kaon induced reactions on a proton target are investigated in an effective Lagrangian approach. Two treatments of the $t$-channel Born term, the Feynman model and the Regge model, are introduced to calculate the total and differential cross sections of the ${\pi }^{-}p\to f_1(1420)n$ and $K^{-}p\to f_1(1420)\Lambda$ reactions. The numerical results indicate that the experimental data of the total cross section of the ${\pi }^{-}p\to f_1(1420)n$ reaction can be reproduced in both the Feynman and the Regge models. Based on the parameters determined in the pion induced reaction, the cross sections of the $K^{-}p\to f_1(1420)\Lambda$ reaction, about which there is little data found in the literature, are predicted in the same beam momentum range. It is found that the line shapes of the total cross section obtained in a kaon induced reaction with two treatments are quite different. The cross sections for both reactions are at an order of magnitude of $\mu$b, or larger, at a beam momenta up to 10 GeV/c. The differential cross sections for both pion and kaon induced reactions are also present. It is found that in the Regge model, the $t$ channel provides a sharp increase at extreme forward angles. The results suggest that the experimental study of the $f_1(1420)$ in the kaon induced reaction on a proton target is as promising as in the pion induced reaction. Such an experimental measurement is also very helpful to clarify the production mechanism of the $f_1(1420)$.

    hep-phnucl-exnucl-thPRD(2019)·8 citations
16. 16*

    Next-to-leading-order QCD corrections to gluon fragmentation into ${}^1{S}_0^{(1,8)}$ quarkonia

    Feng Feng🇨🇳 · Yu Jia🇨🇳

    Within the NRQCD factorization framework, we compute the next-to-leading-order QCD corrections to the gluon fragmentation into the ${}^1{S}_0^{(1,8)}$ Fock components of a quarkonium, at the lowest order in velocity expansion. We follow the operator definition of the fragmentation function advanced by Collins and Soper. The key technique underpinning our calculation is the sector decomposition method widely used in the area of multi-loop computation. It is found that the NLO QCD corrections have significant effects, and qualitatively modify the profiles of the corresponding leading-order fragmentation functions.

    hep-phCPC(2023)·26 citations
17. 17*

    Determination of the pole position of the lightest hybrid meson candidate

    JPAC Collaboration: A. Rodas🇪🇸 · A. Pilloni🇺🇸 · M. Albaladejo🇺🇸 · C. Fernandez-Ramirez🇲🇽 · A. Jackura🇺🇸 · V. Mathieu🇺🇸 · M. Mikhasenko🇩🇪 · J. Nys🇧🇪 · V. Pauk🇩🇪 · B. Ketzer🇩🇪 · A. Szczepaniak🇺🇸

    Mapping states with explicit gluonic degrees of freedom in the light sector is a challenge, and has led to controversies in the past. In particular, the experiments have reported two different hybrid candidates with spin-exotic signature, pi1(1400) and pi1(1600), which couple separately to eta pi and eta' pi. This picture is not compatible with recent Lattice QCD estimates for hybrid states, nor with most phenomenological models. We consider the recent partial wave analysis of the eta(') pi system by the COMPASS collaboration. We fit the extracted intensities and phases with a coupled-channel amplitude that enforces the unitarity and analyticity of the S-matrix. We provide a robust extraction of a single exotic pi1 resonant pole, with mass and width 1564 +- 24 +- 86 MeV and 492 +- 54 +- 102 MeV, which couples to both eta(') pi channels. We find no evidence for a second exotic state. We also provide the resonance parameters of the a2(1320) and a2'(1700).

    hep-phhep-exPRL(2019)·154 citations
18. 18*

    Weak Gravity Conjecture from Unitarity and Causality

    Yuta Hamada🇬🇷 · Toshifumi Noumi🇯🇵 · Gary Shiu🇺🇸

    The weak gravity conjecture states that quantum gravity theories have to contain a charged state with a charge-to-mass ratio bigger than unity. By studying unitarity and causality constraints on higher derivative corrections to the charge-to-mass ratio of extremal back holes, we demonstrate that heavy extremal black holes can play the role of the required charged state under several assumptions. In particular, our argument is applicable when the higher spin states Reggeizing graviton exchange are subdominant in the photon scattering. It covers (1) theories with light neutral bosons such as dilaton and moduli, and (2) UV completion where the photon and the graviton are accompanied by different sets of Regge states just like open string theory. Our result provides an existence proof of the weak gravity conjecture in a wide class of theories, including generic string theory setups with the dilaton or other moduli stabilized below the string scale.

    ↳ hep-thgr-qchep-phPRL(2019)·226 citations
19. 19*

    Magnetic Vortex Lattices in Finite Isospin Chiral Perturbation Theory

    Prabal Adhikari🇺🇸

    We study finite isospin chiral perturbation theory ($\chi$PT) in a uniform external magnetic field and find the condensation energy of magnetic vortex lattices using the method of successive approximations (originally used by Abrikosov) near the upper critical point beyond which the system is in the normal vacuum phase. The difference between standard Ginzburg-Landau (GL) theory (or equivalently the Abelian Higgs model) and $\chi$PT arises due to the presence of additional momentum-dependent (derivative) interactions in $\chi$PT and the presence of electromagnetically neutral pions that interact with the charged pions via strong interactions but do not couple directly to the external magnetic field. We find that while the vortex lattice structure is hexagonal similar to vortices in GL theory, the condensation energy (relative to the normal vacuum state in a uniform, external magnetic field) is smaller (larger in magnitude) due to the presence of derivative interactions. Furthermore, we establish that neutral pions do not condense in the vortex lattice near the upper critical field.

    ↳ nucl-thhep-phPLB(2019)·26 citations
20. 20*

    Inclusive Studies of Short-Range Correlations: Overview and New Results

    Zhihong Ye🇺🇸 · John Arrington🇺🇸

    We present an overview of Short-Range Correlations (SRC) studies using the inclusive measurement of the electron scattering off nuclei. A brief introduction of the origin of the SRC is given, followed by the survey of the two-nucleon SRC (2N-SRC) study and its interesting connection to the EMC effect. A discussion of the three-nucleon SRC study (3N-SRC) measured by the Jefferson Lab's Hall B and Hall C experiments which showed contradictory results is given and, most importantly, we report a new result from the Hall A E08-014 experiment which was dedicated on studying 3N-SRC. Our high precision 4He/3He cross section ratios at the x > 2 region do not show a 3N-SRC plateau as predicted by the naive SRC model. To further investigate the 3N-SRC as well as the Isospin effect of the SRC, we have designed several approved experiments in Hall A and in Hall C, including the Tritium experiments using the mirror nuclei (3H and 3He) which are currently running in Hall A.

    ↳ nucl-exhep-phnucl-th9 citations
21. 21*

    Progress in the Nucleon Electric Dipole Moment Calculations in Lattice QCD

    S. Syritsyn🇺🇸 · T. Izubuchi🇺🇸 · H. Ohki🇺🇸

    Electric dipole moments (EDMs), which are sought as evidence of CP violation, require lattice calculations to connect constraints from experiments to limits on the strong CP violation within QCD or CP violation in new physics beyond the standard model. Nucleon EDM calculations on a lattice are notoriously hard due to large statistical noise, chiral symmetry violating effects, and potential mixing of the EDM and the anomalous magnetic moment of the nucleon. In this report, details of ongoing lattice calculations of proton and neutron EDMs induced by the QCD $\theta$-term and the quark chromo-EDM, the lowest-dimension effective CP-violating quark-gluon interaction are presented. Our calculation employs chiral-symmetric fermion discretization. An assessment of feasibility of nucleon EDM calculations at the physical point is discussed.

    ↳ hep-lathep-phnucl-th7 citations
22. 22*

    Open charm hadron spectroscopy at B-factories

    Yuji Kato🇯🇵 · Toru Iijima🇯🇵

    Open charm hadrons are excellent probe to study the dynamics of quarks and gluons inside hadrons. Because the mass of a charm quark is heavier than ${\Lambda }_{QCD}$, the so called heavy quark symmetry emerges in the hadron containing a charm quark and plays a central role in the classification and constraining the interactions. Belle and BaBar, which are B-factory experiments, have made significant advances in the field of open charm hadron spectroscopy in these 15 years. In this article, experimental advances on both open charm mesons and baryons by B-factory experiments are reviewed. Finally, the prospect of the open charm hadrons with the next generation B-factory experiment, Belle II is described.

    ↳ hep-exhep-phPPNP(2019)·17 citations
23. 23*

    Directed searches for gravitational waves from ultralight bosons

    Maximiliano Isi🇺🇸 · Ling Sun🇺🇸 · Richard Brito🇩🇪 · Andrew Melatos🇦🇺

    Gravitational-wave detectors can search for yet-undiscovered ultralight bosons, including those conjectured to solve problems in particle physics, high-energy theory and cosmology. Ground-based instruments could probe boson masses between $10^{-15}$ eV to $10^{-11}$ eV, which are largely inaccessible to other experiments. In this paper, we explore the prospect of searching for the continuous gravitational waves generated by boson clouds around known black holes. We carefully study the predicted waveforms and use the latest-available numerical results to model signals for different black-hole and boson parameters. We then demonstrate the suitability of a specific method (hidden Markov model tracking) to efficiently search for such signals, even when the source parameters are not perfectly known and allowing for some uncertainty in theoretical predictions. We empirically study this method's sensitivity and computational cost in the context of boson signals, finding that it will be possible to target remnants from compact-binary mergers localized with at least three instruments. For signals from scalar clouds, we also compute detection horizons for future detectors (Advanced LIGO, LIGO Voyager, Cosmic Explorer and the Einstein Telescope). Among other results, we find that, after one year of observation, an Advanced LIGO detector at design sensitivity could detect these sources up to over 100 Mpc, while Cosmic Explorer could reach over $10^4$ Mpc. These projections offer a more complete picture than previous estimates based on analytic approximations to the signal power or idealized search strategies. Finally, we discuss specific implications for the followup of compact-binary coalescences and black holes in x-ray binaries. Along the way, we review the basic physics of bosons around black holes, in the hope of providing a bridge between the theory and data-analysis literatures.

    ↳ gr-qcastro-ph.HEhep-phPRD(2019)·137 citations
24. 24*

    Feynman Integrals and Intersection Theory

    Pierpaolo Mastrolia🇮🇹 · Sebastian Mizera🇨🇦

    We introduce the tools of intersection theory to the study of Feynman integrals, which allows for a new way of projecting integrals onto a basis. In order to illustrate this technique, we consider the Baikov representation of maximal cuts in arbitrary space-time dimension. We introduce a minimal basis of differential forms with logarithmic singularities on the boundaries of the corresponding integration cycles. We give an algorithm for computing a basis decomposition of an arbitrary maximal cut using so-called intersection numbers and describe two alternative ways of computing them. Furthermore, we show how to obtain Pfaffian systems of differential equations for the basis integrals using the same technique. All the steps are illustrated on the example of a two-loop non-planar triangle diagram with a massive loop.

    ↳ hep-thhep-phmath-phmath.MPJHEP(2019)·298 citations
25. 25*

    Chiral spiral in the presence of chiral imbalance

    Michael Thies🇩🇪

    The phase diagram of the two-dimensional Nambu-Jona-Lasinio (or chiral Gross-Neveu) model is characterized by an order parameter in the form of a chiral spiral. Its radius vanishes at a critical temperature, its period depends only on the chemical potential. We generalize these findings to chirally imbalanced systems by including a chiral chemical potential ${\mu }_5$. The relationship between the present, static approach and a previous, time dependent one is traced back to a half-local symmetry which the NJL${}_2$ model shares with massless Dirac fermions, but which has been neglected so far. The structure of chiral spiral matter is further elucidated by computing fermion and antifermion momentum distribution functions, using a Bogoliubov transformation.

    ↳ hep-thhep-phnucl-thPRD(2018)·12 citations
26. 26*

    Statistical anisotropy in CMB spectral distortions

    Atsuhisa Ota🇬🇧

    Measurements of the cosmic microwave background (CMB) spectral $y$-distortion anisotropy offer a test for the statistical isotropy of the primordial density perturbations on $0.01\lesssim k\mathrm{Mpc}\lesssim 1$. We compute the 1-point ensemble averages of the $y$-distortion anisotropies which vanish for the statistically isotropic perturbations. For the quadrupole statistical anisotropy, we find $4\pi ⟨y_{2m}⟩=-6.8A_2\times 10^{-9}{Y}_{2m}(\mathbf{d})$ with the quadruple Legendre coefficient of the anisotropic powerspectrum $A_2$ and the $\ell =2$ spherical harmonics $Y_{2m}(\mathbf{d})$ for the preferred direction $\mathbf{d}$. Also, we discuss the cosmic variance of the $y$-distortion anisotropy in the statistically anisotropic Universe.

    ↳ astro-ph.COgr-qchep-phPLB(2019)·7 citations
27. 27*

    Simulations of Subatomic Many-Body Physics on a Quantum Frequency Processor

    Hsuan-Hao Lu🇺🇸 · Natalie Klco🇺🇸 · Joseph M. Lukens🇺🇸 · Titus D. Morris🇺🇸 · Aaina Bansal🇺🇸 · Andreas Ekström🇸🇪 · Gaute Hagen🇺🇸 · Thomas Papenbrock🇺🇸 · Andrew M. Weiner🇺🇸 · Martin J. Savage🇺🇸 · Pavel Lougovski🇺🇸

    Simulating complex many-body quantum phenomena is a major scientific impetus behind the development of quantum computing, and a range of technologies are being explored to address such systems. We present the results of the largest photonics-based simulation to date, applied in the context of subatomic physics. Using an all-optical quantum frequency processor, the ground-state energies of light nuclei including the triton (${}^3$H), ${}^3$He, and the alpha particle (${}^4$He) are computed. Complementing these calculations and utilizing a 68-dimensional Hilbert space, our photonic simulator is used to perform sub-nucleon calculations of the two-body and three-body forces between heavy mesons in the Schwinger model. This work is a first step in simulating subatomic many-body physics on quantum frequency processors---augmenting classical computations that bridge scales from quarks to nuclei.

    ↳ quant-phhep-lathep-phnucl-th+1PRA(2019)·146 citations
28. 28*

    Rescuing Single Field Inflation from the Swampland

    Amjad Ashoorioon🇮🇷

    The difficulty of building metastable vacua in string theory has led some to conjecture that, in the string theory landscape, potentials satisfy $\left|\nabla V/V\right|\ge c\sim \mathcal{O}(1)$. This condition, which is supported by different explicit constructions, suggests that the EFTs which lead to metastable de-Sitter vacua belong to what is dubbed as swampland. This condition endangers the paradigm of single field inflation. In this paper, we show how scalar excited initial states cannot rescue single field inflation from the swampland, as they produce large local scalar non-gaussianity, which is in conflict with the Planck upper bound. Instead, we demonstrate that one can salvage single field inflation using excited initial states for tensor perturbations, which in this case produce only large flattened non-gaussianity in the tensor bispectrum. We comment on the possible methods one can prepare such excited initial conditions for the tensor perturbations.

    ↳ hep-thastro-ph.COgr-qchep-phPLB(2019)·96 citations
29. 29*

    Probing Cosmic Strings with Gravitational-Wave Fringe

    Sunghoon Jung🇰🇷 · TaeHun Kim🇰🇷

    Cosmic strings are important remnants of early-Universe phase transitions. We show that they can be probed by Gravitational Waves (GWs) from compact binary mergers. If such chirping GW passes by a cosmic string, it is gravitationally lensed and left with a characteristic signal of the lensing -- the GW fringe. It is observable naturally through the frequency chirping of GWs. This allows to probe cosmic strings with small tension $\Delta =8\pi G\mu =10^{-6}\text{ – }10^{-10}$, just below the current constraint, at high-frequency LIGO-band and mid-band detectors. Although its detection rates are estimated to be small, even a single detection can be used to identify a cosmic string. Contrary to the stochastic GW produced from loop decays only in local $U(1)$ models, the GW fringe can directly probe straight strings model independently. This is also complementary to the existing probes with the strong lensing of light.

    ↳ astro-ph.COgr-qchep-phJCAP(2020)·12 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.