Wed·Nov 14, 2018Wednesday·November 14, 2018

1. 01*

   Schwinger Generating Functional Derivation of LHC Elastic Proton-Proton Scattering Amplitudes

   Peter H. Tsang🇺🇸

   A recent Schwinger Generating Functional based formulation, by H.M.Fried,Y.Gabellini,T.Grandou and Y-M.Sheu and P.H.Tsang provided gauge-invariant, exact, non-perturbative solutions for QCD. After choosing a renormalization scheme and assuming a simpler 2 body quark-quark scattering problem, this formalism is tested against experimental elastic proton-proton scattering at LHC energies (7, 8, 13 TeV). This formulation was previously compared with ISR energies at (23.5 - 62.5 GeV). The full scattering amplitude with infinite gluons summed, infinite loops summed and their interference terms are needed for LHC differential cross-sections.

   hep-phAIP Conf.Proc.(2019)·1 citation
2. 02*

   SMEFT top-quark effects on $\Delta F=2$ observables

   Motoi Endo🇯🇵 · Teppei Kitahara🇩🇪 · Daiki Ueda🇯🇵

   We investigate model independent top-quark corrections to $\Delta F=2$ processes for the down-type quarks within the framework of the Standard Model Effective Field Theory. Dimension-six $\Delta F=1$ operators contribute to them through renormalization group evolutions and matching conditions. We provide a complete one-loop matching formula from the top quarks for $\Delta F=2$ transitions. We also demonstrate these corrections on $\Delta M_{B_s}$ in the left-right symmetric model, which are compared with the conventional calculation.

   hep-phJHEP(2019)·27 citations
3. 03*

   Second-Order Leptonic Radiative Corrections for Lepton-Proton Scattering

   R.-D. Bucoveanu🇩🇪 · H. Spiesberger🇩🇪

   The interpretation of high-precision lepton-nucleon scattering experiments requires the knowledge of higher-order radiative corrections. We present a calculation of the cross section for unpolarized lepton-proton scattering including leptonic radiative corrections up to second order, including one- and two-loop corrections, radiation of one and two photons and one-loop corrections for one-photon radiation. Numerical results are given for the planned P2 experiment at the MESA facility in Mainz, and some results are also discussed for Qweak and the suggested MUSE experiment.

   hep-phnucl-thEPJA(2019)·34 citations
4. 04*

   Probing CPT breaking induced by quantum decoherence at DUNE

   J.C. Carrasco🇵🇪 · F.N. Díaz🇵🇪 · A.M. Gago🇵🇪

   We show that, the decoherence phenomena applied to the neutrino system could lead us to have an observable breaking of the fundamental CPT symmetry. We require a specific textures of non-diagonal decoherence matrices, with non-zero ${\delta }_{CP}$, for having such observations. Using the information from the CPT conjugate channels: ${\nu }_{\mu }\to {\nu }_{\mu }$ and ${\bar{\nu }}_{\mu }\to {\bar{\nu }}_{\mu }$ and its corresponding backgrounds, we have estimated the sensitivity of DUNE experiment for testing CPT under the previous conditions. Four scenarios for energy dependent decoherence parameters ${\Gamma }_{E_{\nu }}=\Gamma \times (E_{\nu }/\mathrm{GeV}{)}^n$, $n=-1,0,1,$ and $2$ are taken into account, for most of them, DUNE is able to achieve a 5$\sigma$ discovery potential having $\Gamma$ in $\mathcal{O}(10^{-23}$ GeV) for ${\delta }_{CP}=3\pi /2$. Meanwhile, for ${\delta }_{CP}=\pi /2$ we reach 3$\sigma$ for $\Gamma$ in $\mathcal{O}(10^{-24}$ GeV).

   hep-phPRD(2019)·33 citations
5. 05*

   Moduli Oscillation Induced by Reheating

   Daisuke Hagihara🇯🇵 · Koichi Hamaguchi🇯🇵 · Kazunori Nakayama🇯🇵

   We estimate the abundance of the coherent oscillation of moduli, which linearly couple to matter fields through higher dimensional operators. During the (p)reheating after inflation, matter particles are efficiently produced and it can affect the moduli potential in a non-adiabatic way, which results in the coherent oscillation of the moduli. In particular, such effects are most important at the very beginning of the (p)reheating. It is found that this production mechanism is so efficient that a successful evolution of the universe can be threatened even if the moduli mass is larger than the Hubble scale.

   hep-phastro-ph.COhep-thJCAP(2019)·12 citations
6. 06*

   Next-to-leading-order predictions for single vector-like quark production at the LHC

   Giacomo Cacciapaglia🇫🇷 · Alexandra Carvalho🇪🇪 · Aldo Deandrea🇫🇷 · Thomas Flacke🇰🇷 · Benjamin Fuks🇫🇷 · Devdatta Majumder🇺🇸 · Luca Panizzi🇸🇪 · Hua-Sheng Shao🇫🇷

   We propose simulation strategies for single production of third generation vector-like quarks at the LHC, implementing next-to-leading-order corrections in QCD and studying in detail their effect on cross sections and differential distributions. We also investigate the differences and the relative incertitudes induced by the use of the Four-Flavour Number Scheme $versus$ the Five-Flavour Number Scheme. As a phenomenological illustration, we concentrate on the production of vector-like quarks coupling to the third generation of the Standard Model in association with a jet and assuming standard couplings to gauge and Higgs bosons.

   hep-phPLB(2019)·70 citations
7. 07*

   Five Non-Fritzsch Texture Zeros for Quarks Mass Matrices in the Standard Model

   Yithsbey Giraldo🇨🇴 · Eduardo Rojas🇨🇴

   In the Standard Model, we obtain a non-Fritzsch like configuration with five texture zeros for the quark mass matrices. This matrix generates the quark masses, the inner angles of the CKM unitary triangle, and the CP-violating phase in the quark sector. This work can be applied to the PMNS matrix in the lepton sector, by assuming Dirac masses for the neutrinos, where non-trivial predictions for the neutrino masses and mixing angles are expected.

   hep-ph3 citations
8. 08*

   Effect of the chiral phase transition on axion mass and self-coupling

   Zhen-Yan Lu🇨🇳 · Marco Ruggieri🇨🇳

   We compute the effect of the chiral phase transition of QCD on the axion mass and self-coupling; the coupling of the axion to the quarks at finite temperature is described within the Nambu-Jona-Lasinio model. We find that the axion mass decreases with temperature, following the response of the topological susceptibility, in agreement with previous results obtained within chiral perturbation theory at low and intermediate temperatures. As expected, the comparison with lattice data shows that chiral perturbation theory fails to reproduce the topological susceptibility around the chiral critical temperature, while the Nambu$-$Jona-Lasinio model offers a better qualitative agreement with these data, hence a more reliable estimate of the temperature dependence of the axion mass in the presence of a hot quark medium. We complete our study by computing the temperature dependence of the self-coupling of the axion, finding that this coupling decreases at and above the phase transition. The model used in our work as well as the results presented here pave the way to the computation of the in-medium effects of hot and/or dense quark-gluon plasma on the axion properties.

   hep-phPRD(2019)·31 citations
9. 09*

   In-medium masses and magnetic moments of decuplet baryons

   Harpreet Singh🇮🇳 · Arvind Kumar🇮🇳 · Harleen Dahiya🇮🇳

   The magnetic moments of baryon decuplet are studied in vacuum as well as in the symmetric nuclear matter at finite temperature using a chiral SU(3) quark mean field model approach. The contributions coming from the valence quarks, quark sea and the orbital angular momentum of the quark sea have been considered to calculate magnetic moment of decuplet baryons. The decuplet baryon masses decrease, whereas, the magnetic moments increase significantly with the rise of baryonic density of the symmetric nuclear medium. This is because of the reason that constituent quark magnetic moment and the quark spin polarizations show considerable variation in the nuclear medium especially in the low temperature and baryonic density regime. The increase is however quantitatively less as compared to the case of octet baryon members.

   hep-phnucl-th1 citation
10. 10*

    ${\Omega }_c$ excited states with heavy-quark spin symmetry

    Laura Tolos🇩🇪 · Rafael Pavao🇪🇸 · Juan Nieves🇪🇸

    We study the $C=1$, $S=-2$, $I=0$ sector, where five excited ${\Omega }_c$ states have been recently observed by the LHCb Collaboration. We start from a recently developed unitarized baryon-meson model that takes, as bare baryon-meson interaction, an extended Weinberg-Tomozawa kernel consistent with both chiral and heavy-quark spin symmetries. This $\mathrm{SU}(6)\times \mathrm{HQSS}$ scheme leads to a successful description of the observed lowest-lying odd parity charmed ${\Lambda }_c$(2595) and ${\Lambda }_c$(2625) states, and bottomed ${\Lambda }_b$(5912) and ${\Lambda }_b$(5920) resonances. Within this model, five odd-parity ${\Omega }_c$ states are dynamically generated, but with masses below 3 GeV, not allowing for an identification with the observed LHCb resonances. We revise this model and explore two different scenarios for the renormalization scheme, that is, using a modified common energy scale to perform the subtractions or utilizing a common ultraviolet cutoff to render finite the ultraviolet divergent loop functions in all channels. In both cases, we show that some (at least three) of the dynamically generated states can be identified with the experimental ${\Omega }_c$, while having odd parity and $J=1/2$ or $J=3/2$. Two of these states turn out to be part of the same $\mathrm{SU}(6)\times \mathrm{HQSS}$ multiplets as the charmed and bottomed $\Lambda$ baryons.

    hep-phhep-exnucl-thPoS(2018)·0 citations
11. 11*

    New targets for relic antineutrino capture

    Jeong-Yeon Lee🇰🇷 · Yeongduk Kim🇰🇷 · Satoshi Chiba🇯🇵

    ${}^{163}$Ho has been considered as a suitable candidate for the capture of relic antineutrinos. However, the detection of the relic antineutrino using ${}^{163}$Ho is extremely challenging with current techniques. Therefore, we have searched for new targets for relic antineutrino detections through the resonant capture on nuclides undergoing electron capture. We have investigated nuclear and atomic properties of all nuclides. And we finally propose ${}^{131}$Ba, ${}^{159}$Dy, ${}^{175}$Hf, ${}^{195}$Au, and ${}^{243}$Cm as new candidates for the relic antineutrino detection, and call for high precise experiments of $Q_{\mathrm{EC}}$-values and intensities of EC decays for these new candidates.

    hep-phnucl-thNPA(2023)·3 citations
12. 12*

    The Role of Positron Polarization for the initial 250 GeV stage of the ILC

    Jürgen Reuter🇩🇪

    The International Linear Collider is now proposed with a staged machine design, with the first stage at $\sqrt{s}=250$ GeV and an integrated luminosity goal of 2 ab${}^{-1}$. One of the questions for the machine design is the importance of positron polarization. In this report, we review the impact of positron polarization on the physics goals of the 250 GeV stage of the ILC and demonstrate that positron polarization has distinct advantages.

    hep-phhep-exphysics.ins-detPoS(2019)·1 citation
13. 13*

    Configurational Entropy can disentangle conventional hadrons from exotica

    P. Colangelo🇮🇹 · F. Loparco🇮🇹

    We evaluate the Configurational Entropy (CE) for scalar mesons and for $J^P={\frac{1}{2}}^{+}$ baryons in a holographic approach, varying the dimension of boundary theory operators and using the soft-wall dual model of QCD. We find that hybrid and multiquark mesons are characterized by an increasingly large CE. A similar behavior is observed for $J^P={\frac{1}{2}}^{+}$ baryons, where the CE of pentaquarks is larger than for three-quark baryons, for same radial number. Configurational Entropy seems relevant in disentangling conventional hadrons from exotica.

    hep-phPLB(2019)·41 citations
14. 14*

    Some insights into the newly observed $Z_c(4100)$ in $B^0\to {\eta }_c{K}^{+}{\pi }^{-}$ by LHCb

    Qiang Zhao🇨🇳

    The newly reported exotic signal $Z_c(4100)$ by the LHCb Collaboration in the invariant mass spectrum of ${\eta }_c{\pi }^{-}$ in $B^0\to {\eta }_c{K}^{+}{\pi }^{-}$ has been a new experimental evidence for an exotic meson containing four constituent quarks. Although the present experimental information is very limited, we show that its correlations with some existing exotic candidates can be recognized. This signal can be either caused by final state interaction effects or a $P$-wave resonance state arising from the $D^{\ast }{\bar{D}}^{\ast }$ interaction. For the latter option its neutral partner will have exotic quantum numbers of $I^G(J^{PC})=1^{-}(1^{-+})$. This signal, if confirmed, would provide important clues for dynamics for producing multiquark systems in $B$ meson decays and $e^{+}{e}^{-}$ annihilations.

    hep-ph12 citations
15. 15*

    Mixed electroweak-QCD corrections to $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}H$ at CEPC with finite-width effect

    Wen Chen🇨🇳 · Feng Feng🇨🇳 · Yu Jia🇨🇳 · Wen-Long Sang🇨🇳

    The associated production of Higgs boson with a muon pair, $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}H$, is one of the golden channels to pin down the properties of the Higgs boson in the prospective Higgs factories exemplified by \textsf{CEPC}. The projected accuracy of the corresponding cross section measurement is about per cent level at CEPC. In this work, we investigate both $\mathcal{O}(\alpha )$ weak correction and the $\mathcal{O}(\alpha {\alpha }_s)$ mixed electroweak-QCD corrections for this channel, appropriately taking into account the effect of finite $Z^0$ width. The ${\mu }^{+}{\mu }^{-}$ invariant mass spectrum is also predicted. The mixed electroweak-QCD correction turns out to reach 1.5\% of the Born-order result, and thereby must be included in future confrontation with the data. We also observe that, after including higher-order corrections, the simplified prediction for the integrated cross section employing the narrow-width-approximation may deviate from our full result by a few per cents.

    hep-phhep-exCPC(2019)·20 citations
16. 16*

    Light charged Higgs boson production at the Large Hadron electron Collider

    O. Flores-Sánchez🇲🇽 · J. Hernández-Sánchez🇲🇽 · C. G. Honorato🇲🇽 · S. Moretti🇬🇧 · S. Rosado-Navarro🇲🇽

    We study the production of a light charged Higgs boson at the future Large Hadron electron Collider (LHeC), through the process $e^{-}p\to {\nu }_e{H}^{-}q$ considering both decay channels $H^{-}\to b\bar{c}$ and $H^{-}\to \tau {\bar{\nu }}_{\tau }$ in the final state. We analyse these processes in the context of the 2-Higgs Doublet Model Type III (2HDM-III) and assess the LHeC sensitivity to such $H^{-}$ signals against a variety of both reducible and irreducible backgrounds. We confirm that prospects for $H^{-}$ detection in the 2HDM-III are excellent assuming standard collider energy and luminosity conditions.

    hep-phhep-exPRD(2019)·9 citations
17. 17*

    LHC-friendly minimal freeze-in models

    G. Bélanger🇫🇷 · N. Desai🇫🇷 · A. Goudelis🇫🇷 · J. Harz🇩🇪 · A. Lessa🇧🇷 · J.M. No🇪🇸 · A. Pukhov🇷🇺 · S. Sekmen🇰🇷 · D. Sengupta🇺🇸 · B. Zaldivar🇫🇷 · J. Zurita🇩🇪

    We propose simple freeze-in models where the observed dark matter abundance is explained via the decay of an electrically charged and/or coloured parent particle into Feebly Interacting Massive Particles (FIMP). The parent particle is long-lived and yields a wide variety of LHC signatures depending on its lifetime and quantum numbers. We assess the current constraints and future high luminosity reach of these scenarios at the LHC from searches for heavy stable charged particles, disappearing tracks, displaced vertices and displaced leptons. We show that the LHC constitutes a powerful probe of freeze-in dark matter and can further provide interesting insights on the validity of vanilla baryogenesis and leptogenesis scenarios.

    hep-phhep-exJHEP(2019)·127 citations
18. 18*

    Electric dipole moment constraints on CP-violating light-quark Yukawas

    Joachim Brod🇺🇸 · Dimitrios Skodras🇩🇪

    Nonstandard CP violation in the Higgs sector can play an essential role in electroweak baryogenesis. We calculate the full two-loop matching conditions of the standard model, with Higgs Yukawa couplings to light quarks modified to include arbitrary CP-violating phases, onto an effective Lagrangian comprising CP-odd electric and chromoelectric light-quark (up, down, and strange) dipole operators. We find large isospin-breaking contributions of the electroweak diagrams. Using these results, we obtain significant constraints on the phases of the light-quark Yukawas from experimental bounds on the neutron and mercury electric dipole moments.

    hep-phJHEP(2019)·30 citations
19. 19*

    Global analysis of three-flavour neutrino oscillations: synergies and tensions in the determination of theta_23, delta_CP, and the mass ordering

    Ivan Esteban🇪🇸 · M.C. Gonzalez-Garcia🇪🇸 · Alvaro Hernandez-Cabezudo🇩🇪 · Michele Maltoni🇪🇸 · Thomas Schwetz🇩🇪

    We present the results of a global analysis of the neutrino oscillation data available as of fall 2018 in the framework of three massive mixed neutrinos with the goal at determining the ranges of allowed values for the six relevant parameters. We describe the complementarity and quantify the tensions among the results of the different data samples contributing to the determination of each parameter. We also show how those vary when combining our global likelihood with the chi^2 map provided by Super-Kamiokande for their atmospheric neutrino data analysis in the same framework. The best fit of the analysis is for the normal mass ordering with inverted ordering being disfavoured with a Delta_chi^2 = 4.7 (9.3) without (with) SK-atm. We find a preference for the second octant of theta_23, disfavouring the first octant with Delta_chi^2 = 4.4 (6.0) without (with) SK-atm. The best fit for the complex phase is Delta_CP = 215_deg with CP conservation being allowed at Delta_chi^2 = 1.5 (1.8). As a byproduct we quantify the correlated ranges for the laboratory observables sensitive to the absolute neutrino mass scale in beta decay, m_nu_e, and neutrino-less double beta decay, m_ee, and the total mass of the neutrinos, Sigma, which is most relevant in Cosmology.

    hep-phhep-exJHEP(2019)·921 citations
20. 20*

    Neutrino Masses in a Two Higgs Doublet Model with a U(1) Gauge Symmetry

    Daniel A. Camargo🇧🇷 · Alex G. Dias🇧🇷 · Tessio B. de Melo🇧🇷 · Farinaldo S. Queiroz🇧🇷

    General Two Higgs Doublet Models (2HDM) are popular Standard Model extensions but feature flavor changing interactions and lack neutrino masses. We discuss a 2HDM where neutrino masses are generated via type I seesaw and propose an extension where neutrino masses are generated via a type II seesaw mechanism with flavor changing interactions being absent via the presence of a U(1) gauge symmetry. After considering a variety of bounds such as those rising from collider and electroweak precision we show that our proposal stands as a UV complete 2HDM with a dark photon where neutrino masses and flavor changing interactions are addressed. A possible dark matter realization is also discussed.

    hep-phJHEP(2019)·36 citations
21. 21*

    Double Higgs boson production at NLO in the high-energy limit: complete analytic results

    Joshua Davies🇩🇪 · Go Mishima🇩🇪 · Matthias Steinhauser🇩🇪 · David Wellmann🇩🇪

    We compute the NLO virtual corrections to the partonic cross section of $gg\to HH$, in the high energy limit. Finite Higgs boson mass effects are taken into account via an expansion which is shown to converge quickly. We obtain analytic results for the next-to-leading order form factors which can be used to compute the cross section. The method used for the calculation of the (non-planar) master integrals is described in detail and explicit results are presented.

    hep-phJHEP(2019)·99 citations
22. 22*

    Warm Little Inflaton becomes Cold Dark Matter

    Joao G. Rosa🇵🇹 · Luis B. Ventura🇵🇹

    We present a model where the inflaton can naturally account for all the dark matter in the Universe within the warm inflation paradigm. In particular, we show that the symmetries of the Warm Little Inflaton scenario (i) avoid large thermal and radiative corrections to the scalar potential, (ii) allow for sufficiently strong dissipative effects to sustain a radiation bath during inflation that becomes dominant at the end of the slow-roll regime, and (iii) enable a stable inflaton remnant in the post-inflationary epochs. The latter behaves as dark radiation until parametrically before matter-radiation equality, leading to a non-negligible contribution to the effective number of relativistic degrees of freedom during nucleosynthesis, becoming the dominant cold dark matter component in the Universe for inflaton masses in the $10^{-4}-10^{-1}$ eV range. Cold dark matter isocurvature perturbations, anti-correlated with the main adiabatic component, provide a smoking gun for this scenario that can be tested in the near future.

    hep-phastro-ph.COgr-qchep-thPRL(2019)·45 citations
23. 23*

    Dark Matter with Stuckelberg Axions

    Claudio Coriano🇮🇹 · Paul H. Frampton🇮🇹 · Nikos Irges🇬🇷 · Alessandro Tatullo🇮🇹

    We review a class of models which generalize the traditional Peccei-Quinn (PQ) axion solution by a Stückelberg pseudoscalar. Such axion models represent a significant variant with respect to earlier scenarios where axion fields were associated with global anomalies, because of the Stückelberg field, which is essential for the cancellation of gauge anomalies in the presence of extra $U(1)$ symmetries. The extra neutral currents associated to these models have been investigated in the past in orientifold models with intersecting branes, under the assumption that the Stückelberg scale was in the multi-TeV region. Such constructions, at the field theory level, are quite general and can be interpreted as the four-dimensional field theory realization of the Green-Schwarz mechanism of anomaly cancellation of string theory. We present an overview of models of this type in the TeV/multi TeV range in their original formulation and their recent embeddings into an ordinary GUT theory, presenting an $E_6\times U(1{)}_X$ model as an example. In this case the model contains two axions, the first corresponding to a Peccei-Quinn axion, whose misalignment takes place at the QCD phase transition, with a mass in the meV region and which solves the strong CP problem. The second axion is ultralight, in the $10^{-20}-10^{-22}$ eV region, due to a misalignment and a decoupling taking place at the GUT scale. The two scales introduced by the PQ solution, the PQ breaking scale and the misalignment scale at the QCD hadron transition, become the Planck and the GUT scales respectively, with a global anomaly replaced by a gauge anomaly. The periodic potential and the corresponding oscillations are related to a particle whose De Broglie wavelength can reach 10 kpc. Such a sub-galactic scale has been deemed necessary in order to resolve several dark matter issues at the astrophysical level.

    hep-phastro-ph.COhep-thFront.in Phys.(2019)·8 citations
24. 24*

    Centrality and Transverse momentum dependencies of Hadrons in Xe+Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV from a multi-phase transport model

    Lilin Zhu🇨🇳 · Hua Zheng🇨🇳 · Ruimin Kong

    In this paper, we study and predict the charged-particle pseudorapidity multiplicity density ($\frac{d{N}_{ch}}{d\eta }$), transverse momentum spectra of identified particles and their ratios in relativistic heavy ion collisions at the Large Hadron Collider (LHC), using the string-melting version of a multi-phase transport (AMPT) model with improved quark coalescence method. Results of the charged-particle pseudorapidity multiplicity density from AMPT model calculations for Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV are compared with the experimental data. Good agreements are generally found between theoretical calculations and experimental data. We predict $\frac{d{N}_{ch}}{d\eta }$ for Xe+Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV at different centralities, and $p_T$ spectra of charged pions, kaons and protons, and their ratios $K/\pi$ and $p/\pi$ in Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV and Xe+Xe collisions at $\sqrt{s_{NN}}=5.44$ TeV that are being studied at LHC. The $p_T$ spectra of identified particles in Pb+Pb collisions from the improved AMPT model are compared and found to be consistent with results from the iEBE-VISHNU hybrid model with TRENTo initial condition.

    hep-phnucl-thEPJA(2019)·12 citations
25. 25*

    Is SU(3) gauge theory with 13 massless flavors conformal?

    Zoltan Fodor🇭🇺 · Kieran Holland🇺🇸 · Julius Kuti🇺🇸 · Daniel Nogradi🇭🇺 · Chik Him Wong🇩🇪

    We use lattice simulations to study SU(3) gauge theory with 13 massless fermions in the fundamental representation. We present evidence that the theory is conformal with a non-zero infrared fixed point in the gauge coupling. We use a newly-developed technique to calculate the mass anomalous dimension at the fixed point via step-scaling of the mode number, allowing us to take the continuum limit and compare to perturbative predictions. We comment on the relevance of these findings to the extended search for the conformal window in the fundamental representation and in particular 12 massless flavors.

    ↳ hep-lathep-phPoS(2018)·11 citations
26. 26*

    Testing a best-fit hydrodynamical model using PCA

    Tiago Nunes da Silva🇧🇷 · David Dobrigkeit Chinellato🇧🇷 · Rafael Derradi de Souza🇧🇷 · Mauricio Hippert🇧🇷 · Matthew Luzum🇧🇷 · Jorge Noronha🇧🇷 · Jun Takahashi🇧🇷

    Recently, a comprehensive Bayesian analysis was performed to simultaneously extract the values of a number of hydrodynamic parameters necessary for compatibility with a limited set of experimental data from the LHC. In this work, this best-fit model is tested against newly measured experimental flow results not included in the original work, namely the principal components of the two-particle correlation matrix in transverse momentum. The results from simulations show a good numerical agreement with data obtained by the CMS Collaboration.

    ↳ nucl-thhep-phnucl-exMDPI Proc.(2019)·6 citations
27. 27*

    Poincaré invariance in NRQCD and pNRQCD revisited

    Matthias Berwein🇯🇵 · Nora Brambilla🇩🇪 · Sungmin Hwang🇩🇪 · Antonio Vairo🇩🇪

    We investigate how fields transform under the Poincaré group in nonrelativistic effective field theories of QCD. In constructing these transformations, we rely only on symmetries and field redefinitions to limit the number of allowed terms. By requiring invariance of the action under these transformations, nontrivial relations between Wilson coefficients for both nonrelativistic QCD and potential nonrelativistic QCD are derived. We show explicitly how the Poincaré algebra is satisfied, and how this gives complementary information on the Wilson coefficients. We also briefly discuss the implications of our results, as well as the possibility of applying this method to other types of effective field theories.

    ↳ hep-thhep-phPRD(2019)·17 citations
28. 28*

    Softly broken conformal symmetry with quantum gravitational corrections

    Krzysztof A. Meissner🇵🇱 · Hermann Nicolai🇩🇪 · Jan Plefka🇩🇪

    We show that a previously proposed new mechanism to eliminate quadratic divergences for scalar masses is self-consistently compatible with corrections induced by perturbative quantum gravity, provided the theory embeds consistently into a UV completion at the Planck scale.

    ↳ hep-thhep-phPLB(2019)·8 citations
29. 29*

    Thermodynamic Behaviour of Magnetized QGP within the Self-Consistent Quasiparticle Model

    Sebastian Koothottil🇮🇳 · Vishnu M. Bannur🇮🇳

    The self-consistent quasiparticle model has been successful in studying QCD thermodynamics. In this model, the medium effects are taken into account by considering quarks and gluons as quasiparticles with temperature-dependent masses which are proportional to the plasma frequency. The present work involves the extension of this model in the presence of magnetic fields. We have included the effect of the magnetic field by considering relativistic Landau Levels. The quasiparticle masses are then found to be dependent on both temperature and magnetic field. The thermomagnetic mass thus defined allows obtaining the thermodynamics of magnetized quark matter within the self-consistent quasiparticle model. The model then has been applied to the case of 2-flavor Quark-Gluon Plasma and the equation of state obtained in the presence of magnetic fields.

    ↳ nucl-thhep-phPRC(2019)·29 citations
30. 30*

    Dark matter in $R+R^2$ cosmology

    E.V. Arbuzova🇷🇺 · A. D. Dolgov🇷🇺 · R. S. Singh🇷🇺

    Production of massive stable relics in $R^2$-modified gravity is considered. It is shown that the cosmological evolution and kinetics of massive species differs significantly from those in the conventional cosmology. The results are applied to the lightest supersymmetric particles and it is argued that they are viable candidates for the constituents of dark matter, if their mass is about 1000 TeV.

    ↳ astro-ph.COhep-phJCAP(2019)·19 citations
31. 31*

    ATENSOR - REDUCE program for tensor simplification

    V.A.Ilyin🇷🇺 · A.P.Kryukov🇷🇺

    The paper presents a REDUCE program for the simplification of tensor expressions that are considered as formal indexed objects. The proposed algorithm is based on the consideration of tensor expressions as vectors in some linear space. This linear space is formed by all the elements of the group algebra of the corresponding tensor expression. Such approach permits us to simplify the tensor expressions possessing symmetry properties, summation (dummy) indices and multiterm identities by unify manner. The canonical element for the tensor expression is defined in terms of the basic vectors of this linear space. The main restriction of the algorithm is the dimension of the linear space that is equal to N!, where N is a number of indices of the tensor expression. The program uses REDUCE as user interface.

    ↳ cs.SChep-phhep-thComput.Phys.Commun.(1996)·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.