Fri·Aug 4, 2017Friday·August 4, 2017

1. 01*

   Hadron Resonance Gas with Repulsive Interactions and Fluctuations of Conserved Charges

   P. Huovinen🇵🇱 · P. Petreczky🇺🇸

   We discuss the role of repulsive baryon-baryon interactions in a hadron gas using relativistic virial expansion and repulsive mean field approaches. The fluctuations of the baryon number as well as strangeness-baryon correlations are calculated in the hadron resonance gas with repulsive interactions and compared with the recent lattice QCD results. In particular, we calculate the difference between the second and fourth order fluctuations and correlations of baryon number and strangeness, that have been proposed as probes of deconfinement. We show that for not too high temperatures these differences could be understood in terms of repulsive interactions.

   hep-phhep-latnucl-thPLB(2018)·83 citations
2. 02*

   The Dark Sequential Z' Portal: Collider and Direct Detection Experiments

   Giorgio Arcadi🇩🇪 · Miguel D. Campos🇩🇪 · Manfred Lindner🇩🇪 · Antonio Masiero🇮🇹 · Farinaldo S. Queiroz🇩🇪

   We revisit the status of a Majorana fermion as a dark matter candidate when a sequential Z' gauge boson dictates the dark matter phenomenology. Direct dark matter detection signatures rise from dark matter-nucleus scatterings at bubble chamber and liquid xenon detectors, and from the flux of neutrinos from the Sun measured by the IceCube experiment, which is governed by the spin-dependent dark matter-nucleus scattering. On the collider side, LHC searches for dilepton and mono-jet + missing energy signals play an important role. The relic density and perturbativity requirements are also addressed. By exploiting the dark matter complementarity we outline the region of parameter space where one can successfully have a Majorana dark matter particle in light of current and planned experimental sensitivities.

   hep-phastro-ph.HEhep-exPRD(2018)·26 citations
3. 03*

   Di-Higgs production at the LHC and beyond

   Jose Zurita🇩🇪

   In this talk I discuss the status and future prospects of testing the Higgs self-couplings at the High Luminosity LHC (HL-LHC) as well as several Beyond Standard Model (BSM) scenarios that could be probed via Higgs pair production in the coming years.

   hep-ph5 citations
4. 04*

   APFEL++: A new PDF evolution library in C++

   Valerio Bertone🇳🇱

   I present a preliminary version of {\tt APFEL++}, a C++ rewriting of the Fortran 77 evolution code {\tt APFEL}. In this contribution I discuss the new philosophy adopted for the numerical computation of the convolutions, demonstrate the ability to reproduce old results in an accurate and fast way, and present an original application to the computation of the semi-inclusive deep-inelastic-scattering cross section to next-to-leading order in QCD.

   hep-phPoS(2018)·115 citations
5. 05*

   The photon PDF from high-mass Drell-Yan data at the LHC

   Valerio Bertone🇳🇱

   I present a determination of the photon PDF from a fit to the recent ATLAS measurements of high-mass Drell-Yan lepton-pair production at $\sqrt{s}=8$ TeV. This analysis is based on the {\tt xFitter} framework interfaced to the {\tt APFEL} program, that accounts for NLO QED effects, and to the {\tt aMCfast} code to account for the photon-initiated contributions within {\tt MadGraph5\_aMC@NLO}. The result is compared with other recent determinations of the photon PDF finding a general good agreement.

   hep-phCERN Proc.(2018)·0 citations
6. 06*

   Hard photoproduction of a diphoton with a large invariant mass

   A. Pedrak🇵🇱 · B. Pire🇫🇷 · L. Szymanowski🇵🇱 · J. Wagner🇵🇱

   The electromagnetic probe has proven to be a very efficient way to access the $3-$dimensional structure of the nucleon, particularly thanks to the exclusive Compton processes. We explore the hard photoproduction of a large invariant mass diphoton in the kinematical regime where the diphoton is nearly forward and its invariant mass is the hard scale enabling to factorize the scattering amplitude in terms of generalized parton distributions. This amplitude has a very peculiar and interesting analytic structure. We calculate unpolarized cross sections and the angular asymmetry triggered by a linearly polarized photon beam.

   hep-phhep-exnucl-exnucl-thPRD(2017)·63 citations
7. 07*

   Neutrino Physics

   P. Hernandez🇪🇸

   This is the writeup of the lectures on neutrino physics delivered at various schools: TASI and Trieste in 2013 and the CERN-Latin American School in 2015. The topics discussed in this lecture include: general properties of neutrinos in the SM, the theory of neutrino masses and mixings (Dirac and Majorana), neutrino oscillations both in vacuum and in matter, as well as an overview of the experimental evidence for neutrino masses and of the prospects in neutrino oscillation physics. We also briefly review the relevance of neutrinos in leptogenesis and in beyond-the-Standard-Model physics.

   hep-phCERN Yellow Report CERN 2015-005, pp. 85-…·33 citations
8. 08*

   Influence of the axial anomaly on the decay $N(1535)\to N\eta$

   Lisa Olbrich🇩🇪 · Miklós Zétényi🇭🇺 · Francesco Giacosa🇩🇪 · Dirk H. Rischke🇩🇪

   The decay width of $N(1535)\to N\eta$ is as large as that of $N(1535)\to N\pi$. This is in evident conflict with simple expectations based on flavor symmetry and phase space. Similarly, the decay width of $\Lambda (1670)\to \Lambda (1116)\eta$ is larger than predicted by flavor symmetry. In this work, we propose that the axial $U(1{)}_A$ anomaly is responsible for an enhanced coupling of (some) excited baryons to the $\eta$ meson. We test this idea by including a new, chirally symmetric but $U(1{)}_A$ anomalous, term in an effective hadronic model decribing baryons and their chiral partners in the mirror assignment. This term enhances the decay of the chiral partners into baryons and an $\eta$ meson, such as $N(1535)\to N\eta$. Moreover, a strong coupling of $N(1535)$ to $N{\eta }^{\prime }$ emerges (this is important for studies of ${\eta }^{\prime }$ production processes). Our approach shows that $N(1535)$ is predominantly the chiral partner of $N(939)$, and $\Lambda (1670)$ the chiral partner of $\Lambda (1116)$. Finally, our formalism can be used to couple the pseudoscalar glueball $\tilde{G}$ to baryons. We expect a large cross section for the reaction $\bar{p}p\to \tilde{G}\to \bar{p}p(1535)$, which can be experimentally tested in the future PANDA experiment.

   hep-phPRD(2018)·22 citations
9. 09*

   Strange sea determination from collider data

   S. Alekhin🇩🇪 · J. Blümlein🇩🇪 · S. Moch🇩🇪

   We consider determinations of the strange sea in the nucleon based on the QCD analyses of data collected at the LHC with focus on the recent high-statistics ATLAS measurement of the $W^{\pm }$- and $Z$-boson production. We study the effect of different functional forms for parameterization of the parton distribution functions and the combination of various data sets in the analysis. We compare to earlier strange sea determinations and discuss ways to improve them in the future.

   hep-phPLB(2018)·45 citations
10. 10*

    Phenomenological formula for CKM matrix and its physical interpretation

    Kohzo Nishida🇯🇵

    We propose a phenomenological formula relating the Cabibbo--Kobayashi--Masukawa matrix $V_{CKM}$ and quark masses in the form $(\sqrt{m_d}\sqrt{m_s}\sqrt{m_b})\propto (\sqrt{m_u}\sqrt{m_c}\sqrt{m_t})V_{CKM}$. The results of the proposed formula are in agreement with experimental data. Under the constraint of the formula, we show that the invariant amplitude of the charged current weak interactions is maximized.

    hep-phPTEP(2017)·1 citation
11. 11*

    Overview of the CSM concept and its tests

    F.M. Renard🇫🇷

    We recall the motivations for the Compositeness Standard Model(CSM) concept, its precise description, the procedures for its applications and the particular constraints that it requires. We present its most spectacular predictions for typical processes observable at present and future colliders. To the previous results we add the treatment of the inclusive processes $e^{+}{e}^{-}\to H,Z,Wort+anything$.

    hep-ph13 citations
12. 12*

    2014 European School of High-Energy Physics

    M. Mulders (ed.)🇨🇭 · G. Zanderighi (ed.)🇨🇭

    The European School of High-Energy Physics is intended to give young physicists an introduction to the the- oretical aspects of recent advances in elementary particle physics. These proceedings contain lecture notes on the theory of quantum chromodynamics, Higgs physics, Flavour physics and CP violation, and Supersymmetry.

    hep-ph0 citations
13. 13*

    Analytical calculation for the gluon fragmentation into spin-triplet S-wave quarkonium

    Peng Zhang🇨🇳 · Yan-Qing Ma🇨🇳 · Qian Chen🇨🇳 · Kuang-Ta Chao🇨🇳

    Fragmentation is the dominant mechanism for hadron production with high transverse momentum. For spin-triplet S-wave heavy quarkonium production, contribution of gluon fragmenting to color-singlet channel has been numerically calculated since 1993. However, there is still no analytic expression available up to now because of its complexity. In this paper, we calculate both polarization-summed and polarized fragmentation functions of gluon fragmenting to a heavy quark-antiquark pair with quantum number ${}^3{S}_1^{[1]}$. Our calculations are performed in two different frameworks. One is the widely used nonrelativistic QCD factorization, and the other is the newly proposed soft gluon factorization. In either case, we calculate at both leading order and next-to-leading order in velocity expansion. All of our final results are presented in terms of compact analytic expressions.

    hep-phPRD(2017)·19 citations
14. 14*

    Reactor Fuel Fraction Information on the Antineutrino Anomaly

    C. Giunti🇮🇹 · X.P. Ji🇨🇳 · M. Laveder🇮🇹 · Y.F. Li🇨🇳 · B.R. Littlejohn🇺🇸

    We analyzed the evolution data of the Daya Bay reactor neutrino experiment in terms of short-baseline active-sterile neutrino oscillations taking into account the theoretical uncertainties of the reactor antineutrino fluxes. We found that oscillations are disfavored at $2.6\sigma$ with respect to a suppression of the ${}^{235}\text{U}$ reactor antineutrino flux and at $2.5\sigma$ with respect to variations of the ${}^{235}\text{U}$ and ${}^{239}\text{Pu}$ fluxes. On the other hand, the analysis of the rates of the short-baseline reactor neutrino experiments favor active-sterile neutrino oscillations and disfavor the suppression of the ${}^{235}\text{U}$ flux at $3.1\sigma$ and variations of the ${}^{235}\text{U}$ and ${}^{239}\text{Pu}$ fluxes at $2.8\sigma$. We also found that both the Daya Bay evolution data and the global rate data are well-fitted with composite hypotheses including variations of the ${}^{235}\text{U}$ or ${}^{239}\text{Pu}$ fluxes in addition to active-sterile neutrino oscillations. A combined analysis of the Daya Bay evolution data and the global rate data shows a slight preference for oscillations with respect to variations of the ${}^{235}\text{U}$ and ${}^{239}\text{Pu}$ fluxes. However, the best fits of the combined data are given by the composite models, with a preference for the model with an enhancement of the ${}^{239}\text{Pu}$ flux and relatively large oscillations.

    hep-phhep-exnucl-exnucl-thJHEP(2017)·58 citations
15. 15*

    Pico-charged intermediate particles rescue dark matter interpretation of 511 keV signal

    Yasaman Farzan🇮🇷 · Meshkat Rajaee🇮🇷

    Various alleged indirect dark matter search signals, such as the 511 keV line from galaxy center or the PAMELA/AMS02 signal, are often challenged by the absence of corresponding signal from dwarf galaxies and/or from the absence of an impact on CMB through delayed recombination. We propose a novel scenario that can avoid these bounds based on the decay of dark matter, X, to a pair of intermediate particles C and \bar{C} with a lifetime much greater than the age of universe. The annihilation of these intermediate particles eventually leads to a dark matter signal. The bounds from CMB can be easily avoided by the fact that at the time of recombination, not enough C particles had been accumulated. In order to keep C particles from leaving the galaxy, we assume the particles have a small electric charge so in the galactic disk, the magnetic field keeps the C particles in the vicinity of their production. However, they can escape the dwarf galaxies and the dark matter halo where the magnetic field is weak, leading to null signal from these regions. The small charge can have interesting consequences including a signal in direct dark matter searches.

    hep-phJHEP(2017)·14 citations
16. 16*

    Impact of New Physics on the EW vacuum stability in a curved spacetime background

    E. Bentivegna🇮🇹 · V. Branchina🇮🇹 · F. Contino🇮🇹 · D. Zappalà🇮🇹

    It has been recently shown that, contrary to an intuitive decoupling argument, the presence of new physics at very large energy scales (say around the Planck scale) can have a strong impact on the electroweak vacuum lifetime. In particular, the vacuum could be totally destabilized. This study was performed in a flat spacetime background, and it is important to extend the analysis to curved spacetime since these are Planckian-physics effects. It is generally expected that under these extreme conditions gravity should totally quench the formation of true vacuum bubbles, thus washing out the destabilizing effect of new physics. In this work we extend the analysis to curved spacetime and show that, although gravity pushes toward stabilization, the destabilizing effect of new physics is still (by far) the dominating one. In order to get model independent results, high energy new physics is parametrized in two different independent ways: as higher order operators in the Higgs field, or introducing new particles with very large masses. The destabilizing effect is observed in both cases, hinting at a general mechanism that does not depend on the parametrization details for new physics, thus maintaining the results obtained from the analysis performed in flat spacetime.

    hep-phgr-qchep-thJHEP(2017)·31 citations
17. 17*

    Status of neutrino oscillations 2018: first hint for normal mass ordering and improved CP sensitivity

    P. F. de Salas🇪🇸 · D. V. Forero🇧🇷 · C. A. Ternes🇪🇸 · M. Tortola🇪🇸 · J. W. F. Valle🇪🇸

    We present a new global fit of neutrino oscillation parameters within the simplest three-neutrino picture, including new data which appeared since our previous analysis~\cite{Forero:2014bxa}. In this update we include new long-baseline neutrino data involving the antineutrino channel in T2K, as well as new data in the neutrino channel, data from NO$\nu$A, as well as new reactor data, such as the Daya Bay 1230 days electron antineutrino disappearance spectrum data and the 1500 live days prompt spectrum from RENO, as well as new Double Chooz data. We also include atmospheric neutrino data from the IceCube DeepCore and ANTARES neutrino telescopes and from Super-Kamiokande. Finally, we also update our solar oscillation analysis by including the 2055-day day/night spectrum from the fourth phase of the Super-Kamiokande experiment. With the new data we find a preference for the atmospheric angle in the upper octant for both neutrino mass orderings, with maximal mixing allowed at $\Delta {\chi }^2=1.6(3.2)$ for normal (inverted) ordering. We also obtain a strong preference for values of the CP phase $\delta$ in the range $[\pi ,2\pi ]$, excluding values close to $\pi /2$ at more than 4$\sigma$. More remarkably, our global analysis shows for the first time hints in favour of the normal mass ordering over the inverted one at more than 3$\sigma$. We discuss in detail the origin of the mass ordering, CP violation and octant sensitivities, analyzing the interplay among the different neutrino data samples.

    hep-phhep-exPLB(2018)·791 citations
18. 18*

    On the Casimir scaling violation in the cusp anomalous dimension at small angle

    Andrey Grozin🇷🇺 · Johannes Henn🇩🇪 · Maximilian Stahlhofen🇩🇪

    We compute the four-loop $n_f$ contribution proportional to the quartic Casimir of the QCD cusp anomalous dimension as an expansion for small cusp angle $\varphi$. This piece is gauge invariant, violates Casimir scaling, and first appears at four loops. It requires the evaluation of genuine non-planar four-loop Feynman integrals. We present results up to $\mathcal{O}({\varphi }^4)$. One motivation for our calculation is to probe a recent conjecture on the all-order structure of the cusp anomalous dimension. As a byproduct we obtain the four-loop HQET wave function anomalous dimension for this color structure.

    hep-phhep-thJHEP(2017)·51 citations
19. 19*

    Gravitational waves from first-order phase transitions: Towards model separation by bubble nucleation rate

    Ryusuke Jinno🇰🇷 · Sangjun Lee🇰🇷 · Hyeonseok Seong🇰🇷 · Masahiro Takimoto🇯🇵

    We study gravitational-wave production from bubble collisions in a cosmic first-order phase transition, focusing on the possibility of model separation by the bubble nucleation rate dependence of the resulting gravitational-wave spectrum. By using the method of relating the spectrum with the two-point correlator of the energy-momentum tensor $⟨T(x)T(y)⟩$, we first write down analytic expressions for the spectrum with a Gaussian correction to the commonly used nucleation rate, $\Gamma \propto e^{\beta t}\to e^{\beta t-{\gamma }^2{t}^2}$, under the thin-wall and envelope approximations. Then we quantitatively investigate how the spectrum changes with the size of the Gaussian correction. It is found that the spectral shape shows $\mathcal{O}(10)\%$ deviation from $\Gamma \propto e^{\beta t}$ case for some physically motivated scenarios. We also briefly discuss detector sensitivities required to distinguish different spectral shapes.

    hep-phastro-ph.COgr-qchep-thJCAP(2017)·60 citations
20. 20*

    Analytic components for the hadronic total cross-section: Fractional calculus and Mellin transform

    E. Capelas de Oliveira🇧🇷 · M.J. Menon🇧🇷 · P.V.R.G. Silva🇧🇷

    In high-energy hadron-hadron collisions, the dependence of the total cross-section (${\sigma }_{tot}$) with the energy still constitutes an open problem for QCD. Phenomenological analyses usually relies on analytic parameterizations provided by the Regge-Gribov formalism and fits to the experimental data. In this framework, the singularities of the scattering amplitude in the complex angular momentum plane determine the asymptotic behavior of ${\sigma }_{tot}$ in terms of the energy. Usual applications connect simple and triple pole singularities with asymptotic power and logarithmic-squared functions of the energy, respectively. More restrict applications have considered as a leading component for ${\sigma }_{tot}$ an empirical function consisting of a logarithmic raised to a real exponent, which is treated as a free fit parameter. With this function, data reductions lead to good descriptions of the experimental data and real (not integer) values of the exponent. In this paper, making use of two independent formalisms (fractional calculus and Mellin transform), we first show that the singularity associated with this empirical function is a branch point and then we explore the mathematical consequences of the result and possible physical interpretations. After reviewing the determination of the singularities from asymptotic forms of interest through the Mellin transform, we demonstrate that the same analytic results can be obtained by means of the Caputo fractional derivative, leading, therefore, to fractional calculus interpretations. Besides correlating Mellin transform, non-local fractional derivatives and exploring the generalization from integer to real exponents and derivative orders, this fractional calculus result may provide insights for physical interpretations on the asymptotic rise of ${\sigma }_{tot}$.

    hep-phmath-phmath.MP2 citations
21. 21*

    The Photon Content of the Proton

    Aneesh V. Manohar🇺🇸 · Paolo Nason🇮🇹 · Gavin P. Salam🇨🇭 · Giulia Zanderighi🇨🇭

    The photon PDF of the proton is needed for precision comparisons of LHC cross sections with theoretical predictions. In a recent paper, we showed how the photon PDF could be determined in terms of the electromagnetic proton structure functions $F_2$ and $F_L$ measured in electron-proton scattering experiments, and gave an explicit formula for the PDF including all terms up to next-to-leading order. In this paper we give details of the derivation. We obtain the photon PDF using the factorisation theorem and applying it to suitable BSM hard scattering processes. We also obtain the same PDF in a process-independent manner using the usual definition of PDFs in terms of light-cone Fourier transforms of products of operators. We show how our method gives an exact representation for the photon PDF in terms of $F_2$ and $F_L$, valid to all orders in QED and QCD, and including all non-perturbative corrections. This representation is then used to give an explicit formula for the photon PDF to one order higher than our previous result. We also generalise our results to obtain formulæ\ for the polarised photon PDF, as well as the photon TMDPDF. Using our formula, we derive the $P_{\gamma i}$ subset of DGLAP splitting functions to order $\alpha {\alpha }_s$ and ${\alpha }^2$, which agree with known results. We give a detailed explanation of the approach that we follow to determine a photon PDF and its uncertainty within the above framework.

    hep-phJHEP(2017)·301 citations
22. 22*

    Baryogenesis from Oscillations of Charmed or Beautiful Baryons

    Kyle Aitken🇺🇸 · David McKeen🇺🇸 · Ann E. Nelson🇺🇸 · Thomas Neder🇪🇸

    We propose a model for CP violating oscillations of neutral, heavy-flavored baryons into antibaryons at rates which are within a few orders of magnitude of their lifetimes. The flavor structure of the baryon violation suppresses neutron oscillations and baryon number violating nuclear decays to experimentally allowed rates. We also propose a scenario for producing such baryons in the early Universe via the out-of-equilibrium decays of a neutral particle, after hadronization but before nucleosynthesis. We find parameters where CP violating baryon oscillations at a temperature of a few MeV could result in the observed asymmetry between baryons and antibaryons. Furthermore, part of the relevant parameter space for baryogenesis is potentially testable at Belle II via decays of heavy flavor baryons into an exotic neutral fermion. The model introduces four new particles: three light Majorana fermions and a colored scalar. The lightest of these fermions is typically long lived on collider timescales and may be produced in decays of bottom and possibly charmed hadrons.

    hep-phPRD(2017)·66 citations
23. 23*

    Lepton number violation in $B_s$ meson decays induced by an on-shell Majorana neutrino

    Jhovanny Mejia-Guisao🇲🇽 · Diego Milanes🇨🇴 · Nestor Quintero🇨🇴 · Jose D. Ruiz-Alvarez🇨🇴

    Lepton-number violation can be induced by the exchange of an on-shell Majorana neutrino $N$ in semileptonic $|\Delta L|=2$ decays of the $B_s$ meson, $B_s^0\to P^{-}{\pi }^{-}{\mu }^{+}{\mu }^{+}$ with $P=K,D_s$. We investigate the production of such a heavy sterile neutrino through these four-body ${\mu }^{+}{\mu }^{+}$ channels and explore the sensitivity that can be reached at the LHCb and CMS experiments. For heavy neutrino lifetimes of ${\tau }_N$ = [1, 100, 1000] ps and integrated luminosities collected of 10 and 50 fb${}^{-1}$ at the LHCb and 30, 300, and 3000 fb${}^{-1}$ at the CMS, we find a significant sensitivity on branching fractions of the orders $\mathrm{BR}(B_s^0\to K^{-}{\pi }^{-}{\mu }^{+}{\mu }^{+})\lesssim \mathcal{O}(10^{-9}-10^{-8})$ and $\mathrm{BR}(B_s^0\to D_s^{-}{\pi }^{-}{\mu }^{+}{\mu }^{+})\lesssim \mathcal{O}(10^{-8}-10^{-7})$. In the kinematically allowed mass ranges of $m_N\in [0.25,4.77]$ GeV and $m_N\in [0.25,3.29]$ GeV, respectively, we exclude regions on the parameter space ($m_N,|V_{\mu N}{|}^2$) associated with the heavy neutrino, which could slightly improve the limits from $B^{-}\to {\pi }^{+}{\mu }^{-}{\mu }^{-}$ (LHCb).

    hep-phPRD(2018)·23 citations
24. 24*

    The First Detection of Gravitational Waves

    Andrzej Królak🇵🇱 · Mandar Patil🇵🇱

    This article deals with the first detection of gravitational waves by the advanced Laser Interferometer Gravitational Wave Observatory (LIGO) detectors on 14 September 2015, where the signal was generated by two stellar mass black holes with masses 36 $M_{\odot }$ and 29 $M_{\odot }$ that merged to form a 62 $M_{\odot }$ black hole, releasing 3 $M_{\odot }$ energy in gravitational waves, almost 1.3 billion years ago. We begin by providing a brief overview of gravitational waves, their sources and the gravitational wave detectors. We then describe in detail the first detection of gravitational waves from a binary black hole merger. We then comment on the electromagnetic follow up of the detection event with various telescopes. Finally, we conclude with the discussion on the tests of gravity and fundamental physics with the first gravitational wave detection event.

    ↳ gr-qcastro-ph.HEhep-phhep-th+1Universe(2017)·9 citations
25. 25*

    Neutron matter within QCD sum rules

    Bao-Jun Cai🇨🇳 · Lie-Wen Chen🇨🇳

    Equation of state (EOS) of pure neutron matter (PNM) is studied in QCD sum rules (QCDSR). It is found that the QCDSR results on EOS of PNM are in good agreement with predictions by current advanced microscopic many-body theories. Moreover, the higher-order density terms in quark condensates are shown to be important to describe the empirical EOS of PNM in the density region around and above nuclear saturation density although they play minor role at subsaturation densities. The chiral condensates in PNM are also studied, and our results indicate that the higher-order density terms in quark condensates, which are introduced to reasonably describe the empirical EOS of PNM at suprasaturation densities, tend to hinder the appearance of chiral symmetry restoration in PNM at high densities.

    ↳ nucl-thhep-phnucl-exPRC(2018)·6 citations
26. 26*

    CMB constraints on the inflaton couplings and reheating temperature in $\alpha$-attractor inflation

    Marco Drewes🇩🇪 · Jin U Kang🇮🇹 · Ui Ri Mun🇰🇵

    We study reheating in $\alpha$-attractor models of inflation in which the inflaton couples to other scalars or fermions. We show that the parameter space contains viable regions in which the inflaton couplings to radiation can be determined from the properties of CMB temperature fluctuations, in particular the spectral index. This may be the only way to measure these fundamental microphysical parameters, which shaped the universe by setting the initial temperature of the hot big bang and contain important information about the embedding of a given model of inflation into a more fundamental theory of physics. The method can be applied to other models of single field inflation.

    ↳ astro-ph.COhep-phhep-thJHEP(2017)·93 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.