Thu·Jun 27, 2019Thursday·June 27, 2019

1. 01*

   Electroweak Symmetric Dark Matter Balls

   Eduardo Pontón🇧🇷 · Yang Bai🇺🇸 · Bithika Jain🇧🇷

   In the simple Higgs-portal dark matter model with a conserved dark matter number, we show that there exists a non-topological soliton state of dark matter. This state has smaller energy per dark matter number than a free particle state and has its interior in the electroweak symmetric vacuum. It could be produced in the early universe from first-order electroweak phase transition and contribute most of dark matter. This electroweak symmetric dark matter ball is a novel macroscopic dark matter candidate with an energy density of the electroweak scale and a mass of 1 gram or above. Because of its electroweak-symmetric interior, the dark matter ball has a large geometric scattering cross section off a nucleon or a nucleus. Dark matter and neutrino experiments with a large-size detector like Xenon1T, BOREXINO and JUNO have great potential to discover electroweak symmetric dark matter balls. We also discuss the formation of bound states of a dark matter ball and ordinary matter.

   hep-phastro-ph.HEhep-exJHEP(2019)·54 citations
2. 02*

   Dark matter signals from timing spectra at neutrino experiments

   Bhaskar Dutta🇺🇸 · Doojin Kim🇺🇸 · Shu Liao🇺🇸 · Jong-Chul Park🇰🇷 · Seodong Shin🇰🇷 · Louis E. Strigari🇺🇸

   We propose a novel strategy to search for new physics in timing spectra, envisioning the situation in which a new particle comes from the decay of its heavier partner with a finite particle width. The timing distribution of events induced by the dark matter particle scattering at the detector may populate in a relatively narrow range, forming a "resonance-like" shape. Due to this structural feature, the signal may be isolated from the backgrounds, in particular when the backgrounds are uniformly distributed in energy and time. For proof of the principle, we investigate the discovery potential for dark matter from the decay of a dark photon in the COHERENT experiment, and show the exciting prospects for exploring the associated parameter space with this experiment. We analyze the existing CsI detector data with a timing cut and an energy cut, and find, for the first time, an excess in the timing distribution which can be explained by such dark matter. We compare the sensitivity to the kinetic mixing parameter ($ϵ$) for current and future COHERENT experiments with the projected limits from LDMX and DUNE.

   hep-phhep-exPRL(2020)·85 citations
3. 03*

   EFT triangles in the same-sign $WW$ scattering process at the HL-LHC and HE-LHC

   Geetanjali Chaudhary🇮🇳 · Jan Kalinowski🇵🇱 · Manjit Kaur🇮🇳 · Paweł Kozów🇵🇱 · Kaur Sandeep🇮🇳 · Michał Szleper🇵🇱 · Sławomir Tkaczyk🇺🇸

   We investigate the Beyond Standard Model discovery potential in the framework of the Effective Field Theory (EFT) for the same-sign $WW$ scattering process in purely leptonic $W$ decay modes at the High-Luminosity and High-Energy phases of the Large Hadron Collider (LHC). The goal of this paper is to examine the applicability of the EFT approach, with one dimension-8 operator varied at a time, to describe a hypothetical new physics signal in the $WWWW$ quartic coupling. In the considered process there is no experimental handle on the $WW$ invariant mass, and it has previously been shown that the discovery potential at 14 TeV is rather slim. In this paper we report the results calculated for a 27 TeV machine and compare them with the discovery potential obtained at 14 TeV. We find that while the respective discovery regions shift to lower values of the Wilson coefficients, the overall discovery potential of this procedure does not get significantly larger with a higher beam energy.

   hep-phEPJC(2020)·17 citations
4. 04*

   Application of BCFW-recursion relations and the Feynman-tree theorem to the four gluon amplitude with all plus helicities

   M. Maniatis🇨🇱

   Recently it has been shown that in gauge theories amplitudes to any perturbation order can be obtained by glueing together simple three-point on-shell amplitudes. These three-point amplitudes in turn are fixed by locality and Lorentz invariance. This factorization into three-point on-shell amplitudes follows from the BCFW recursion relations and the Feynman-tree theorem. In an explicit example, that is, the four-gluon amplitude with all plus helicities, we illustrate the method. In conventional calculation this amplitude corresponds to one-loop box diagrams.

   hep-phhep-thPRD(2019)·3 citations
5. 05*

   Bounce Configuration from Gradient Flow

   So Chigusa🇯🇵 · Takeo Moroi🇯🇵 · Yutaro Shoji🇯🇵

   Based on the gradient flow, we propose a new method to determine the bounce configuration for false vacuum decay. Our method is applicable to a large class of models with multiple fields. Since the bounce is a saddle point of an action, a naive gradient flow method which minimizes the action does not work. We point out that a simple modification of the flow equation can make the bounce its stable fixed point while the false vacuum configuration an unstable one. Consequently, the bounce configuration can be obtained simply by following the flow without a careful choice of an initial configuration. With numerical analysis, we confirm the validity of our claim, checking that the flow equation we propose indeed has solutions that flow into the bounce configuration.

   hep-phastro-ph.COhep-thnucl-thPLB(2020)·29 citations
6. 06*

   Improved Extrapolation Methods of Data-driven Background Estimation in High-Energy Physics

   Suyong Choi🇰🇷 · Hayoung Oh🇰🇷

   Data-driven methods of background estimations are often used to obtain more reliable descriptions of backgrounds. In hadron collider experiments, data-driven techniques are used to estimate backgrounds due to multi-jet events, which are difficult to model accurately. In this article, we propose an improvement on one of the most widely used data-driven methods in the hadron collision environment, the "ABCD" method of extrapolation. We describe the mathematical background behind the data-driven methods and extend the idea to propose improved general methods.

   hep-phhep-exEPJC(2021)·50 citations
7. 07*

   Pati-Salam unification with a spontaneous CP violation

   Daijiro Suematsu🇯🇵

   Recent neutrino oscillation experiments suggest that the PMNS matrix in the lepton sector has a $CP$ violating phase as the CKM matrix in the quark sector. However, origin of these phases in both matrices are not clarified by now. Although complex Yukawa couplings could induce these phases, they remain as free parameters of the model even in that case. If the $CP$ symmetry is considered to be spontaneously broken, they are expected to be determined by some physics at a much lower energy scale than the Planck scale. We study such a possibility in a framework of Pati-Salam type unification. We also discuss other phenomenological issues in it.

   hep-phPRD(2019)·8 citations
8. 08*

   Multi-scale Mining of Kinematic Distributions with Wavelets

   Ben G. Lillard🇺🇸 · Tilman Plehn🇩🇪 · Alexis Romero🇺🇸 · Tim M. P. Tait🇺🇸

   Typical LHC analyses search for local features in kinematic distributions. Assumptions about anomalous patterns limit them to a relatively narrow subset of possible signals. Wavelets extract information from an entire distribution and decompose it at all scales, simultaneously searching for features over a wide range of scales. We propose a systematic wavelet analysis and show how bumps, bump-dip combinations, and oscillatory patterns are extracted. Our kinematic wavelet analysis kit KWAK provides a publicly available framework to analyze and visualize general distributions.

   hep-phSciPost Phys.(2020)·6 citations
9. 09*

   Nonfactorizable QCD Effects in Higgs Boson Production via Vector Boson Fusion

   Tao Liu🇨🇦 · Kirill Melnikov🇩🇪 · Alexander A. Penin🇨🇦

   We discuss nonfactorizable QCD corrections to Higgs boson production in vector boson fusion at the Large Hadron Collider. We point out that these corrections can be computed in the eikonal approximation retaining all the terms that are not suppressed by the ratio of the transverse momenta of the tagging jets to the total center-of-mass energy. Our analysis shows that in certain kinematic distributions the nonfactorizable corrections can be as large as a percent making them quite comparable to their factorizable counter-parts.

   hep-phPRL(2019)·54 citations
10. 10*

    Double parton distributions for a positronium-like bound state using light-front wave functions

    Chandan Mondal🇨🇳 · Asmita Mukherjee🇮🇳 · Sreeraj Nair🇨🇳

    We investigate the double parton distributions (DPDs) for a positronium-like bound state using light-front QED. We incorporate the higher Fock three particle component of the state, that includes a photon. We obtain the overlap representation of the DPDs in terms of the three-particle light-front wave functions (LFWFs). Our calculation explores the correlations between the momentum fractions of the particles probed and the transverse distance between them, without any assumption of factorization between them. We also investigate the behavior of the DPDs near the kinematical boundary when the sum of the momentum fractions is close to one.

    hep-phPRD(2019)·4 citations
11. 11*

    Coarse graining hadronic scattering

    Enrique Ruiz Arriola🇪🇸 · Jacobo Ruiz de Elvira🇨🇭

    We show that it makes sense to coarse grain hadronic interactions such as $\pi \pi$ and $\pi N$ reactions following previous work on NN scattering. Moreover, if the interaction is taken to be given by chiral dynamics at long distances above a given value $r>r_c$ larger than the elementary radii of the interaction hadrons the unknown short distance region $r<r_c$ is characterized by a {\it finite} number of fitting parameters. This number of independent parameters needed for a presumably complete description of scattering data for a CM energy below $\sqrt{s}$ has been found to be given by $N_{\mathrm{Par}}=N_S\times N_I\times (p{r}_c{)}^2/2$ with $N_S$ and $N_I$ the number of spin and isospin channels, and $p$ the CM momentum respectively. Therefore, for an experiment (or sets of experiments) with a total number of data $N_{\mathrm{Dat}}$ the number of degrees of freedom involved in a ${\chi }^2$-fit is given by $\nu =N_{\mathrm{Dat}}-N_{\mathrm{Par}}$ and confidence levels can be obtained accordingly by standard means. Namely a $1\sigma$ confidence level corresponds to ${\chi }_{\min }^2/\nu \in (1-\sqrt{2/\nu },1+\sqrt{2/\nu })$. We discuss the approach for $\pi \pi$ and $\pi N$ with an eye put on a data selection program and the eventual validation of chiral symmetry.

    hep-phnucl-thPoS(2019)·2 citations
12. 12*

    A note on scalar meson dominance

    Y. Ünal🇹🇷 · Ulf-G. Meißner🇩🇪

    We consider chiral perturbation theory with an explicit broad $\sigma$-meson and study its contribution to the scalar form factors of the pion and the nucleon. Our goal is to learn more about resonance saturation in the scalar sector.

    hep-phnucl-thCPC(2019)·0 citations
13. 13*

    Exotic $\Omega \Omega$ dibaryon states in a molecular picture

    Xiao-Hui Chen🇨🇳 · Qi-Nan Wang🇨🇳 · Wei Chen🇨🇳 · Hua-Xing Chen🇨🇳

    We investigate the exotic $\Omega \Omega$ dibaryon states with $J^P=0^{+}$ and $2^{+}$ in a molecular picture. We construct the scalar and tensor $\Omega$$\Omega$ molecular interpolating currents and calculate their masses within the method of QCD sum rules. Our results indicate that the mass of the scalar dibaryon state is $m_{\Omega \Omega ,0^{+}}=(3.33\pm 0.22)\text{unit}$, which is about $15\mathrm{MeV}$ below the $2m_{\Omega }$ threshold. This result suggests the existence of a loosely bound molecular state of the $J^P=0^{+}$ scalar $\Omega \Omega$ dibaryon with a small binding energy around 15 MeV. The mass of the tensor dibaryon is predicted to be $m_{\Omega \Omega ,2^{+}}=(3.24\pm 0.23)\text{mbox}GeV$, which may imply a deeper molecular state of the tensor $\Omega \Omega$ dibaryon than the scalar channel. These exotic strangeness $S=-6$ and doubly-charged $\Omega \Omega$ dibaryon states may be identified in the heavy-ion collision processes.

    hep-phhep-exhep-latCPC(2021)·14 citations
14. 14*

    Scattering Amplitudes of Massive Spin-2 Kaluza-Klein States Grow Only as $\mathcal{O}(s)$

    R. Sekhar Chivukula🇺🇸 · Dennis Foren🇺🇸 · Kirtimaan A Mohan🇺🇸 · Dipan Sengupta🇺🇸 · Elizabeth Simmons🇺🇸

    We present the results of the first complete calculation of the tree-level $2\to 2$ high-energy scattering amplitudes of the longitudinal modes of massive spin-2 Kaluza-Klein states, both in the case where the internal space is a torus and in the Randall-Sundrum model where the internal space has constant negative curvature. While individual contributions to this amplitude grow as $\mathcal{O}(s^5$), we demonstrate explicitly that intricate cancellations occur between different contributions, reducing the growth to $\mathcal{O}(s)$, a slower rate of growth than previously argued in the literature. These cancellations require subtle relationships between the masses of the Kaluza-Klein states and their interactions, and reflect the underlying higher-dimensional diffeomorphism invariance. Our results provide fresh perspective on the range of validity of (effective) field theories involving massive spin-2 KK particles, with significant implications for the theory and phenomenology of these states.

    hep-phhep-thPRD(2020)·35 citations
15. 15*

    Neutron spin structure from polarized deuteron DIS with proton tagging

    W. Cosyn🇧🇪 · C. Weiss🇺🇸

    Polarized electron-deuteron deep-inelastic scattering (DIS) with detection of the spectator proton ("tagged DIS") enables measurements of neutron spin structure with maximal control of nuclear effects. We calculate the longitudinal spin asymmetries in polarized tagged DIS using methods of light-front nuclear structure and study their dependence on the measured proton momentum. Asymmetries can be formed with all three deuteron spin states ($\pm 1,0$) or the two maximum-spin states only ($\pm 1$, involving tensor polarization). The proton momentum dependence can be used to select pure S-wave configurations in the deuteron and eliminate D-wave depolarization (transverse momenta $p_{pT}\lesssim$ 100 MeV). Free neutron spin structure can be extracted model-independently through pole extrapolation of the tagged asymmetries. Such measurements could be performed at a future electron-ion collider (EIC) with polarized deuteron beams and forward proton detectors.

    hep-phnucl-exnucl-thPLB(2019)·10 citations
16. 16*

    Radial oscillations of quark stars from perturbative QCD

    José C. Jiménez🇧🇷 · Eduardo S. Fraga🇧🇷

    We perform the general relativistic stability analysis against radial oscillations of unpaired quark stars obtained using the equation of state for cold quark matter from perturbative QCD, the only free parameter being the renormalization scale. This approach consistently incorporates the effects of interactions and includes a built-in estimate of the inherent systematic uncertainties in the evaluation of the equation of state. We also take into account the constraints imposed by the recent gravitational wave event GW 170817 to the compact star masses and radii, and restrict their vibrational spectrum.

    hep-phastro-ph.HEgr-qcnucl-thPRD(2019)·23 citations
17. 17*

    A formalism for the resummation of non-factorizable observables in SCET

    Christian W. Bauer🇺🇸 · Pier Francesco Monni🇨🇭

    In the framework of soft-collinear effective theory (SCET), we show how to formulate the resummation for a broad family of final-state, global observables in high-energy collisions in a general way that is suitable for a numerical calculation. Contrary to the standard SCET approach, this results in a method that does not require an observable-specific factorization theorem. We present a complete formulation at next-to-next-to-leading logarithmic order for $e^{+}{e}^{-}$ observables, and show how to systematically extend the framework to higher orders. This work paves the way to automated resummation in SCET for several physical observables within a single framework.

    hep-phJHEP(2020)·8 citations
18. 18*

    CapsNets Continuing the Convolutional Quest

    Sascha Diefenbacher🇩🇪 · Hermann Frost🇩🇪 · Gregor Kasieczka🇩🇪 · Tilman Plehn🇩🇪 · Jennifer M. Thompson🇩🇪

    Capsule networks are ideal tools to combine event-level and subjet information at the LHC. After benchmarking our capsule network against standard convolutional networks, we show how multi-class capsules extract a resonance decaying to top quarks from both, QCD di-jet and the top continuum backgrounds. We then show how its results can be easily interpreted. Finally, we use associated top-Higgs production to demonstrate that capsule networks can work on overlaying images to go beyond calorimeter information.

    hep-phSciPost Phys.(2020)·29 citations
19. 19*

    Relic density of Dark Matter in the Inert Doublet Model beyond Leading Order. I) The Heavy Mass Case

    Shankha Banerjee🇬🇧 · Fawzi Boudjema🇫🇷 · Nabarun Chakrabarty🇹🇼 · Guillaume Chalons🇫🇷 · Hao Sun🇨🇳

    A full renormalisation of the Inert Doublet Model (IDM) is presented and exploited for a precise calculation of the relic density of Dark Matter (DM) at one-loop. In this first paper, we study the case of a DM candidate with $m_{\mathrm{DM}}\sim 500$ GeV. In this regime, the co-annihilation channels are important. We therefore compute, for a wide range of relative velocities, the full next-to-leading order electroweak corrections to 7 annihilation/co-annihilation processes that contribute $\sim$ 70\% to the relic density of DM. These corrected cross-sections are interfaced with {\tt micrOMEGAs} to obtain the one-loop correction to the freeze-out relic density. Due to the accurate measurement of this observable, the one-loop corrections are relevant. We discuss the one-loop renormalisation scheme dependence and point out the influence, at one-loop, of a parameter that solely describes the scattering in the dark sector. A tree-level computation of the relic density is not sensitive to this parameter.

    hep-phhep-exPRD(2019)·50 citations
20. 20*

    Finite Family Groups for Fermionic and Leptoquark Mixing Patterns

    Jordan Bernigaud🇫🇷 · Ivo de Medeiros Varzielas🇵🇹 · Jim Talbert🇩🇪

    We employ a bottom-up and model-independent technique to search for non-Abelian discrete flavour symmetries capable of predicting viable CKM and PMNS matrices alongside of special patterns of leptoquark couplings. In particular, we analyze patterns derived when an ultra-violet flavour theory is assumed to break to global Abelian symmetries in Standard Model fermion masses and new Yukawa-like terms sourced by the leptoquark representation. The phenomenology of different classes of these `simplified models' can be explored without reference to explicit model-building assumptions, e.g. the nature of flavour symmetry breaking or any additional field content associated to it, and are also capable of explaining hints of lepton non-universality in ${\mathcal{R}}_{K^{(\star )}}$. Assuming experimentally interesting CKM and PMNS matrix elements, our algorithm finds an abundance of predictive non-Abelian flavour groups and therefore provides promising directions for future model building in the flavoured leptoquark space, regardless of whether the anomalous ${\mathcal{R}}_{K^{(\star )}}$ measurements withstand further experimental scrutiny.

    hep-phJHEP(2020)·24 citations
21. 21*

    DAB-MOD sensitivity study of heavy flavor $R_{AA}$ and azimuthal anisotropies based on beam energy, initial conditions, hadronization, and suppression mechanisms

    Roland Katz🇫🇷 · Caio A. G. Prado🇨🇳 · Jacquelyn Noronha-Hostler🇺🇸 · Jorge Noronha🇧🇷 · Alexandre A. P. Suaide🇧🇷

    Heavy flavor probes provide important information about the in-medium properties of the quark-gluon plasma produced in heavy-ion collisions. In this work, we investigate the effects of 2D+1 event-by-event fluctuating hydrodynamic backgrounds on the nuclear suppression factor and momentum anisotropies of heavy flavor mesons and non-photonic electrons. Using the state-of-the-art D and B mesons modular simulation code (called "DAB-MOD"), we perform a systematic comparison of different transport equations in the same background, including a few energy loss models --- with and without energy loss fluctuations --- and a relativistic Langevin model with different drag parametrizations. We present the resulting D and B mesons $R_{AA}$, $v_2$, $v_3$, and $v_4$ as well as multi-particle cumulants, in AuAu collisions at $\sqrt{s_{\text{NN}}}=200\text{GeV}$ and PbPb collisions at $\sqrt{s_{\text{NN}}}=2.76\text{TeV}$ and $\sqrt{s_{\text{NN}}}=5.02\text{TeV}$, and compare them to the available experimental data. The $v_2\{4\}/v_2\{2\}$ ratio, which is known to be a powerful probe of the initial conditions and flow fluctuations in the soft sector, is also studied in the context of heavy flavor. We also investigate the correlations between the transverse anisotropies of heavy mesons and all charged particles to better understand how heavy quarks couple to the hydrodynamically expanding quark-gluon plasma. We study the influence that different initial conditions and the implementation of heavy-light quark coalescence has on our results.

    ↳ nucl-thhep-exhep-phPRC(2020)·61 citations
22. 22*

    A new cosmological probe using super-massive black hole shadows

    Jing-Zhao Qi🇨🇳 · Xin Zhang🇨🇳

    We study the prospects of using the low-redshift and high-redshift black hole shadows as new cosmological standard rulers for measuring cosmological parameters. We show that, using the low-redshift observation of the black hole shadow of M87${}^{\star }$, the Hubble constant can be independently determined with a precision of about $13\%$ as $H_0=70\pm 9$ km s${}^{-1}$ Mpc${}^{-1}$. The high-redshift observations of super-massive black hole shadows may accurately determine a combination of parameters $H_0$ and ${\Omega }_{\mathrm{m}}$, and we show by a simple simulation that combining them with the type Ia supernovae observations would give precise measurements of the cosmological parameters.

    ↳ astro-ph.COgr-qchep-phCPC(2020)·32 citations
23. 23*

    Landau-Khalatnikov-Fradkin transformation and the mystery of even $\zeta$-values in Euclidean massless correlators

    A. V. Kotikov🇷🇺 · S. Teber🇫🇷

    The Landau-Khalatnikov-Fradkin (LKF) transformation is a powerful and elegant transformation allowing to study the gauge dependence of the propagator of charged particles interacting with gauge fields. With the help of this transformation, we derive a non-perturbative identity between massless propagators in two different gauges. From this identity, we find that the corresponding perturbative series can be exactly expressed in terms of a hatted transcendental basis that eliminates all even Euler $\zeta$-functions. This explains the mystery of even $\zeta$-values observed in multi-loop calculations of Euclidean massless correlators for almost three decades now. Our construction further allows us to derive an exact formula relating hatted and standard $\zeta$-functions to all orders of perturbation theory.

    ↳ hep-thhep-phPRD(2019)·23 citations
24. 24*

    The gallium anomaly revisited

    Joel Kostensalo🇫🇮 · Jouni Suhonen🇫🇮 · Carlo Giunti🇮🇹 · Praveen C. Srivastava🇮🇳

    The gallium anomaly, i.e. the missing electron-neutrino flux from ${}^{37}$Ar and ${}^{51}$Cr electron-capture decays as measured by the GALLEX and SAGE solar-neutrino detectors, has been among us already for about two decades. We present here a new estimate of the significance of this anomaly based on cross-section calculations using nuclear shell-model wave functions obtained by exploiting recently developed two-nucleon interactions. The gallium anomaly of the GALLEX and SAGE experiments is found to be smaller than that obtained in previous evaluations, decreasing the significance from 3.0$\sigma$ to 2.3$\sigma$. This result is compatible with the recent indication in favor of short-baseline ${\bar{\nu }}_e$ disappearance due to small active-sterile neutrino mixing obtained from the combined analysis of the data of the NEOS and DANSS reactor experiments.

    ↳ nucl-thhep-phPLB(2019)·100 citations
25. 25*

    The Lamb shift of the $1s$ state in hydrogen: two-loop and three-loop contributions

    Savely G. Karshenboim🇩🇪 · Akira Ozawa🇯🇵 · Valery A. Shelyuto🇷🇺 · Robert Szafron🇩🇪 · Vladimir G. Ivanov🇷🇺

    We consider the $1s$ Lamb shift in hydrogen and helium ions, a quantity, required for an accurate determination of the Rydberg constant and the proton charge radius by means of hydrogen spectroscopy, as well as for precision tests of the bound-state QED. The dominant QED contribution to the uncertainty originates from ${\alpha }^{8}m$ external-field contributions (i.e., the contributions at the non-recoil limit). We discuss the two- and three-loop cases and in particular, we revisit calculations of the coefficients $B_{61},B_{60},C_{50}$ in standard notation. We have found a missing logarithmic contribution of order ${\alpha }^2(Z\alpha {)}^{6}m$. We have also obtained leading pure self-energy logarithmic contributions of order ${\alpha }^2(Z\alpha {)}^{8}m$ and ${\alpha }^2(Z\alpha {)}^{9}m$ and estimated the subleading terms of order ${\alpha }^2(Z\alpha {)}^{7}m$, ${\alpha }^2(Z\alpha {)}^{8}m$, and ${\alpha }^2(Z\alpha {)}^{9}m$. The determination of those higher-order contributions enabled us to improve the overall accuracy of the evaluation of the two-loop self-energy of the electron. We investigated the asymptotic behavior of the integrand related to the next-to-leading three-loop term (order ${\alpha }^3(Z\alpha {)}^{5}m$, coefficient $C_{50}$ in standard notation) and applied it to approximate integration over the loop momentum. Our result for contributions to the $1s$ Lamb shift for the total three loop next-to-leading term is $(-3.3\pm 10.5)({\alpha }^3/{\pi }^3)(Z\alpha {)}^{5}m$. Altogether, we have completed the evaluation of the logarithmic contributions to the $1s$ Lamb shift of order ${\alpha }^{8}m$ and reduced the overall ${\alpha }^{8}m$ uncertainty by approximately a factor of three for H, D, and He${}^{+}$ as compared with the most recent CODATA compilation.

    ↳ physics.atom-phhep-phPLB(2019)·30 citations
26. 26*

    Cascade and Omega productions from Pb+Pb Collisions at LHC energy

    Purabi Ghosh🇮🇳 · Jajati K. Nayak🇮🇳 · Sushant K. Singh🇮🇳 · Santosh K. Agarwalla🇮🇳

    Production of multi strange hadrons like cascade ($\Xi$) and omega($\Omega$) baryons are studied microscopically using rate equation at $\sqrt{s_{NN}}$=2.76 TeV, Large Hadron Collider(LHC) energy. The rate equations for $\Xi$, $\Omega$ are solved simultaneously with other strange hadrons in an expanding medium. The results for $\Xi$ and $\Omega$ are compared with the data obtained from Pb-Pb collisions at $\sqrt{s_{NN}}$= 2.76 TeV from ALICE experiments. The ratio of yields of $\Xi$ and $\Omega$ to $\pi$ are analysed with various initial conditions and compared with the experimental observations made for various charge particle multiplicities.

    ↳ nucl-thhep-exhep-ph3 citations
27. 27*

    (3+1)-dimensional dissipative relativistic fluid dynamics at non-zero net baryon density

    Lipei Du🇺🇸 · Ulrich Heinz🇺🇸

    Heavy-ion collisions at center-of-mass energies between 1 and 100 GeV/nucleon are essential to understand the phase diagram of QCD and search for its critical point. At these energies the net baryon density of the system can be high, and simulating its evolution becomes an indispensable part of theoretical modeling. We here present the (3+1)-dimensional diffusive relativistic hydrodynamic code BEShydro which solves the equations of motion of second-order Denicol-Niemi-Molnar-Rischke (DNMR) theory, including bulk and shear viscous currents and baryon diffusion currents. BEShydro features a modular structure that allows to easily turn on and off baryon evolution and different dissipative effects and thus to study their physical effects on the dynamical evolution individually. An extensive set of test protocols for the code, including several novel tests of the precision of baryon transport that can also be used to test other such codes, is documented here and supplied as a permanent part of the code package.

    ↳ nucl-thhep-phnucl-exphysics.comp-phComput.Phys.Commun.(2020)·98 citations
28. 28*

    Sensitivity analysis of the chiral magnetic effect observables using a multiphase transport model

    Ling Huang🇨🇳 · Mao-Wu Nie🇨🇳 · Guo-Liang Ma🇨🇳

    Because the traditional observable of charge-dependent azimuthal correlator $\gamma$ contains both contributions from the chiral magnetic effect (CME) and its background, a new observable of $R_{{\Psi }_m}$ has been recently proposed which is expected to be able to distinguish the CME from the background. In this study, we apply two methods to calculate $R_{{\Psi }_m}$ using a multiphase transport model without or with introducing a percentage of CME-induced charge separation. We demonstrate that the shape of final $R_{{\Psi }_2}$ distribution is flat for the case without the CME, but concave for that with an amount of the CME, because the initial CME signal survives from strong final state interactions. By comparing the responses of $R_{{\Psi }_2}$ and $\gamma$ to the strength of the initial CME, we observe that two observables show different nonlinear sensitivities to the CME. We find that the shape of $R_{{\Psi }_2}$ has an advantage in measuring a small amount of the CME, although it requires large event statistics.

    ↳ nucl-thhep-phnucl-exPRC(2020)·18 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.