Wed·Jul 4, 2018Wednesday·July 4, 2018

1. 01*

   Model-independent diagnostic of self-induced spectral equalization versus ordinary matter effects in supernova neutrinos

   Francesco Capozzi (MPP Munich)🇩🇪 · Basudeb Dasgupta (TIFR, Mumbai)🇮🇳 · Alessandro Mirizzi (Bari Univ., INFN Bari)🇮🇹

   Self-induced flavor conversions near the supernova (SN) core can make the fluxes for different neutrino species become almost equal, potentially altering the dynamics of the SN explosion and washing out all further neutrino oscillation effects. We present a new model-independent analysis strategy for the next galactic SN signal that will distinguish this flavor equalization scenario from a matter effects only scenario during the SN accretion phase. Our method does not rely on fitting or modelling the energy-dependent fluences of the different species to a known function, but rather uses a model-independent comparison of charged-current and neutral-current events at large next-generation underground detectors. Specifically, we advocate that the events due to elastic scattering on protons in a scintillator detector, which is insensitive to oscillation effects and can be used as a model-independent normalization, should be compared with the events due to inverse beta decay of ${\bar{\nu }}_e$ in a water Cherenkov detector and/or the events due to charged-current interactions of ${\nu }_e$ in an Argon detector. The ratio of events in these different detection channels allow one to distinguish a complete flavor equalization from a pure matter effect, for either of the neutrino mass orderings, as long as the spectral differences among the different species are not too small.

   hep-phastro-ph.HEhep-exPRD(2018)·24 citations
2. 02*

   Dark Matter Clusters and Time Correlations in Direct Detection Experiments

   Shmuel Nussinov🇮🇱 · Yongchao Zhang🇺🇸

   Assuming that dark matter (DM) efficiently clusters on various scales we analyse the possible impact on direct DM searches. For certain sizes and densities of DM clusters, mutual detector-cluster encounters may occur only once a year or every several years leading to the apparent failure of individual experiments searching for DM to discover it. If, however, encounters with Earth size and up to $10^4$ times bigger clusters occur about once a year, then finding time correlations between events in different underground detectors can lead to DM discovery.

   hep-phastro-ph.COastro-ph.HEhep-exJHEP(2020)·6 citations
3. 03*

   Controlled flavor violation in the MSSM from a unified $\Delta (27)$ flavor symmetry

   Ivo de Medeiros Varzielas🇵🇹 · M.L. López-Ibáñez🇪🇸 · Aurora Melis🇪🇸 · Oscar Vives🇪🇸

   We study the phenomenology of a unified supersymmetric theory with a flavor symmetry $\Delta (27)$. The model accommodates quark and lepton masses, mixing angles and CP phases. In this model, the Dirac and Majorana mass matrices have a unified texture zero structure in the $(1,1)$ entry that leads to the Gatto-Sartori-Tonin relation between the Cabibbo angle and ratios of the masses in the quark sectors, and to a natural departure from zero of the ${\theta }_{13}^{\ell }$ angle in the lepton sector. We derive the flavor structures of the trilinears and soft mass matrices, and show their general non-universality. This causes large flavor violating effects. As a consequence, the parameter space for this model is constrained, allowing it to be (dis)proven by flavor violation searches in the next decade. Although the results are model specific, we compare them to previous studies to show similar flavour effects (and associated constraints) are expected in general in supersymmetric flavor models, and may be used to distinguish them.

   hep-phJHEP(2018)·21 citations
4. 04*

   Limits on new coloured fermions using precision jet data from the Large Hadron Collider

   Javier Llorente🇨🇳 · Benjamin Nachman🇺🇸

   This work presents an interpretation of high precision jet data from the ATLAS experiment in terms of exclusion limits for new coloured matter. To this end, the effect of a new coloured fermion with a mass $m_X$ on the solution of the renormalization group equation QCD is studied. Theoretical predictions for the transverse energy-energy correlation function and its asymmetry are obtained with such a modified solution and, from the comparison to data, 95\% CL exclusion limits are set on such models.

   hep-phhep-exNPB(2018)·26 citations
5. 05*

   Magnetic moments of the spin-1/2 doubly charmed baryons in covariant baryon chiral perturbation theory

   Ming-Zhu Liu🇨🇳 · Yang Xiao🇨🇳 · Li-Sheng Geng🇨🇳

   Inspired by the recent discovery of the ${\Xi }_{cc}^{++}$ by the LHCb Collaboration, we study the magnetic moments of the spin-1/2 doubly charmed baryons up to the next-to-leading order in covariant baryon chiral perturbation theory with the extended-on-mass-shell renormalization scheme. There are three low energy constants at this order, $a_1$, $a_2$ and $g_a$. The latest lattice QCD simulations allow us to fix a combination of $a_1$ and $a_2$, while the axial-vector coupling $g_a$ can be determined in three different ways, either by fitting to the lattice QCD data, or by the quark model, or by the heavy antiquark diquark symmetry. The magnetic moments of the spin-1/2 doubly charmed baryons ${\Xi }_{cc}^d$ and ${\Xi }_{cc}^s$ can then be predicted. We compare our results with those obtained in the heavy baryon chiral perturbation theory and other approaches, and point out some inconsistencies between the lattice QCD simulations and the quark model.

   hep-phhep-latPRD(2018)·49 citations
6. 06*

   Phenomenological Study of Heavy Hadron Lifetimes

   Hai-Yang Cheng🇹🇼

   The lifetimes of bottom and charmed hadrons are analyzed within the framework of the heavy quark expansion (HQE). Lifetime differences arise from the spectator effects such as weak $W$-annihilation and Pauli interference. Spectator effects originating from dimension-7 four-quark operators are derived. Hadronic matrix elements of four-quark operators are parameterized in a model-independent way. Using the dimension-6 bag parameters recently determined from HQET sum rules and the vacuum insertion approximation for meson matrix elements of dimension-7 operators, the calculated $B$ meson lifetime ratios $\tau (B^{+})/\tau (B_d^0)=1.074$ and $\tau (B_s^0)/\tau (B_d^0)=0.996$ are in excellent agreement with experiment. Likewise, based on the quark model evaluation of baryon matrix elements, the resulting baryon lifetime ratios $\tau ({\Xi }_b^{-})/\tau ({\Lambda }_b^0)$, $\tau ({\Xi }_b^{-})/\tau ({\Xi }_b^0)$, $\tau ({\Omega }_b^{-})/\tau ({\Xi }_b^{-})$ and the ${\Lambda }_b-B^0$ lifetime ratio $\tau ({\Lambda }_b^0)/\tau (B_d^0)=0.955$ also agree well with the data. Contrary to the bottom hadron sector where the HQE in $1/m_b$ works well, the HQE to $1/m_c^3$ fails to give a satisfactory description of the lifetimes of both charmed mesons and charmed baryons. This calls for the subleading $1/m_Q$ corrections to spectator effects. The relevant dimension-7 spectator effects are in the right direction for explaining the large lifetime ratio of $\tau ({\Xi }_c^{+})/\tau ({\Lambda }_c^{+})$.

   hep-phhep-exhep-latJHEP(2018)·54 citations
7. 07*

   Flavor Violating Higgs Couplings in Minimal Flavor Violation

   Jin-Jun Zhang🇨🇳 · Min He🇨🇳 · Xiao-Gang He🇹🇼 · Xing-Bo Yuan🇹🇼

   Motivated by the rencent LHC data on the lepton-flavor violating (LFV) decays $h\to {\ell }_1{\ell }_2$ and $B_{s,d}\to {\ell }_1{\ell }_2$, we study the Higgs-mediated flavor-changing neutral current (FCNC) interactions in the effective field theory (EFT) approach without and with the minimal flavor violation (MFV) hypothesis, and concentrate on the later. After considering the $B$ and $K$ physics data, the various LFV processes, and the LHC Higgs data, severe constraints on the Higgs FCNC couplings are derived, which are dominated by the LHC Higgs data, the $B_s-{\bar{B}}_s$ mixing, and the $\mu \to e\gamma$ decay. In the general case and the MFV framework, allowed ranges of various observables are obtained, such as $\mathcal{B}(B_s\to {\ell }_1{\ell }_2)$, $\mathcal{B}(h\to {\ell }_1{\ell }_2)$, $\mathcal{B}(h\to q_1{q}_2)$, and the branching ratio of $\mu \to e$ conversion in Al. Future prospects of searching for the Higgs FCNC interactions at the low-energy experiments and the LHC are discussed.

   hep-phJHEP(2019)·9 citations
8. 08*

   Hadronic molecular assignment for the newly observed ${\Omega }^{\ast }$ state

   Yong-Hui Lin🇨🇳 · Bing-Song Zou🇨🇳

   Very recently, a new ${\Omega }^{\ast }$ state was reported by the Belle Collaboration, with its mass of $2012.4\pm 0.7\text{(stat)}\pm 0.6\text{(syst)}\mathrm{MeV}$, which locates just below the $K{\Xi }^{\ast }$ threshold and hence hints to be a possible $K{\Xi }^{\ast }$ hadronic molecule. Using the effective Lagrangian approach as the same as our previous works for other possible hadronic molecular states, we investigate the decay behavior of this new ${\Omega }^{\ast }$ state within the hadronic molecular picture. The results show that the measured decay width can be reproduced well and its dominant decay channel is predicted to be the $K\pi \Xi$ three-body decay. This suggests that the newly observed ${\Omega }^{\ast }$ may be ascribed as the $J^P={3/2}^{-}$ $K{\Xi }^{\ast }$ hadronic molecular state and can be further checked through its $K\pi \Xi$ decay channel.

   hep-phPRD(2018)·52 citations
9. 09*

   Dissociation of quarkonium in a strong electric field

   A.M. Ishkhanyan🇦🇲 · V.P. Krainov🇷🇺

   The probability of tunnel decay of quarkonium (bond state of a heavy quark and a heavy antiquark) into free quarks in a strong electric field is estimated.

   hep-phJ.Exp.Theor.Phys.(2018)·0 citations
10. 10*

    On a class of Feynman integrals evaluating to iterated integrals of modular forms

    Luise Adams🇩🇪 · Stefan Weinzierl🇩🇪

    In this talk we discuss a class of Feynman integrals, which can be expressed to all orders in the dimensional regularisation parameter as iterated integrals of modular forms. We review the mathematical prerequisites related to elliptic curves and modular forms. Feynman integrals, which evaluate to iterated integrals of modular forms go beyond the class of multiple polylogarithms. Nevertheless, we may bring for all examples considered the associated system of differential equations by a non-algebraic transformation to an $\epsilon$-form, which makes a solution in terms of iterated integrals immediate.

    hep-phhep-th14 citations
11. 11*

    Electromagnetic form factors of spin 1/2 doubly charmed baryons

    Astrid N. Hiller Blin🇩🇪 · Zhi-Feng Sun🇨🇳 · M. J. Vicente Vacas🇪🇸

    We study the electromagnetic form factors of the doubly charmed baryons, using covariant chiral perturbation theory within the extended on-mass-shell (EOMS) scheme. Vector-meson contributions are also taken into account. We present results for the baryon magnetic moments, charge and magnetic radii. While some of the chiral Lagrangian parameters could be set to values determined in previous works, the available lattice results for ${\Xi }_{cc}^{+}$ and ${\Omega }_{cc}^{+}$ only allow for robust constraints on the low-energy constant (LEC) combination, $c_{89}(=-\frac{1}{3}{c}_8+4c_9)$. The couplings of the doubly charmed baryons to the vector mesons have been estimated assuming the Okubo--Zweig--Iizuka (OZI) rule. We also give the expressions for the form factors of the double beauty baryons considering the masses predicted in the framework of quark models. A comparison of our results with those obtained in heavy baryon chiral perturbation theory (HBChPT) at the same chiral order is made.

    hep-phhep-exhep-latPRD(2018)·32 citations
12. 12*

    Generalized Parton Distributions of Pion for Non-Zero Skewness in AdS/QCD

    Navdeep Kaur🇮🇳 · Narinder Kumar🇮🇳 · Chandan Mondal🇨🇳 · Harleen Dahiya🇮🇳

    We study the generalized parton distributions (GPDs) of pion for non-zero skewness by considering the leading $|q\bar{q}⟩$ Fock state component. Inspired from AdS/QCD light-front wave functions, we calculate the pion GPDs. By taking the Fourier transforms we obtain the results for impact-parameter dependent parton distribution functions (ipdpdf) and for GPDs in longitudinal boost-invariant space. We also calculate the charge density and gravitational form factor of the pion. The pion unpolarized transverse momentum distribution (TMD) have also been calculated. The results provide rich information on the internal structure of pion.

    hep-phNPB(2018)·36 citations
13. 13*

    Modular Invariance Faces Precision Neutrino Data

    Juan Carlos Criado🇪🇸 · Ferruccio Feruglio🇮🇹

    We analyze a modular invariant model of lepton masses, with neutrino masses originating either from the Weinberg operator or from the seesaw. The constraint provided by modular invariance is so strong that neutrino mass ratios, lepton mixing angles and Dirac/Majorana phases do not depend on any Lagrangian parameter. They only depend on the vacuum of the theory, parametrized in terms of a complex modulus and a real field. Thus eight measurable quantities are described by the three vacuum parameters, whose optimization provides an excellent fit to data for the Weinberg operator and a good fit for the seesaw case. Neutrino masses from the Weinberg operator (seesaw) have inverted (normal) ordering. Several sources of potential corrections, such as higher dimensional operators, renormalization group evolution and supersymmetry breaking effects, are carefully discussed and shown not to affect the predictions under reasonable conditions.

    hep-phhep-thSciPost Phys.(2018)·230 citations
14. 14*

    The baryo-quarkonium picture for hidden-charm and bottom pentaquarks and LHCb $P_{\mathrm{c}}(4380)$ and $P_{\mathrm{c}}(4450)$ states

    J. Ferretti🇨🇳 · E. Santopinto🇮🇹 · M. N. Anwar🇨🇳 · M. A. Bedolla🇲🇽

    We study baryo-charmonium [${\eta }_{\mathrm{c}}$- and $J/\psi$-$N^{\ast }$, ${\eta }_{\mathrm{c}}(2S)$-, $\psi (2S)$- and ${\chi }_{\mathrm{c}}(1P)$-$N$] and baryo-bottomonium [${\eta }_{\mathrm{b}}(2S)$-, ${\rm Y}(2S)$- and ${\chi }_{\mathrm{b}}(1P)$-$N$] bound states, where $N$ is the nucleon and $N^{\ast }$ a nucleon resonance. In the baryo-quarkonium model, the five $qqqQ\bar{Q}$ quarks are arranged in terms of a heavy quarkonium core, $Q\bar{Q}$, embedded in light baryonic matter, $qqq$, with $q=u$ or $d$. The interaction between the $Q\bar{Q}$ core and the light baryon can be written in terms of the QCD multipole expansion. The spectrum of baryo-charmonium states is calculated and the results compared with the existing experimental data. In particular, we can interpret the recently discovered $P_{\mathrm{c}}(4380)$ and $P_{\mathrm{c}}(4450)$ pentaquarks as $\psi (2S)$-$N$ and ${\chi }_{c2}(1P)$-$N$ bound states, respectively. We observe that in the baryo-bottomonium sector the binding energies are, on average, slightly larger than those of baryo-charmonia. Because of this, the hidden-bottom pentaquarks are more likely to form than their hidden-charm counterparts. We thus suggest the experimentalists to look for five-quark states in the hidden-bottom sector in the $10.4-10.9$ GeV energy region.

    hep-phPLB(2019)·58 citations
15. 15*

    PISTA: Posterior Ion STAcking

    Johannes Bellm🇸🇪 · Christian Bierlich🇸🇪

    We present a program allowing for the construction of a heavy ion Monte Carlo event using a general purpose proton--proton event generator of the users' choice to deliver sub--collisions. In this heavy ion event, one or more jets can be added, again using a jet calculation of the users' choice, allowing for more realistic simulation studies of jets in a heavy ion background.

    hep-phhep-exnucl-exnucl-th7 citations
16. 16*

    T-odd top partner pair production in the dilepton final states at the LHC in the littlest Higgs Model with T-parity

    Bingfang Yang🇨🇳 · Huaying Zhang🇨🇳 · Biaofeng Hou🇨🇳 · Ning Liu🇨🇳

    In the littlest Higgs Model with T-parity, we discuss the pair production of the T-odd top partner ($T_{-}$) which decays almost 100\% into the top quark and the lightest T-odd particle ($A_H$). Considering the current constraints, we investigate the observability of the T-odd top partner pair production through the process $pp\to T_{-}{\bar{T}}_{-}\to t\bar{t}{A}_H{A}_H$ in final states with two leptons at 14 TeV LHC. We analyze the signal significance and find that the lower limit on the T-odd top partner mass are about 1.04 TeV, 1.14 TeV, 1.23 TeV at $2\sigma$ confidence level at 14TeV LHC with the integrated luminosity of 30 fb${}^{-1}$, 100fb${}^{-1}$, 300fb${}^{-1}$. This lower limit can be raised to about 1.34(1.44) TeV if we use 1000(3000) fb${}^{-1}$ of integrated luminosity.

    hep-phCPC(2018)·8 citations
17. 17*

    From modular forms to differential equations for Feynman integrals

    Johannes Broedel🇩🇪 · Claude Duhr🇨🇭 · Falko Dulat🇺🇸 · Brenda Penante🇨🇭 · Lorenzo Tancredi🇨🇭

    In these proceedings we discuss a representation for modular forms that is more suitable for their application to the calculation of Feynman integrals in the context of iterated integrals and the differential equation method. In particular, we show that for every modular form we can find a representation in terms of powers of complete elliptic integrals of the first kind multiplied by algebraic functions. We illustrate this result on several examples. In particular, we show how to explicitly rewrite elliptic multiple zeta values as iterated integrals over powers of complete elliptic integrals and rational functions, and we discuss how to use our results in the context of the system of differential equations satisfied by the sunrise and kite integrals.

    ↳ hep-thhep-ph35 citations
18. 18*

    Phases of Inflation

    Gary Shiu🇺🇸 · Wieland Staessens🇪🇸

    Motivated by the 4d effective field theories for closed string axions in Type II string compactifications with D-branes, we consider chiral gauge theories coupled to multiple axions. We discuss how well-known non-perturbative dynamical phenomena, such as gauge instantons, fermion confinement and Nambu-Jona-Lasinio interactions, give rise to non-trivial vacuum configurations in the IR. The fluctuations about the IR vacuum are captured by some remaining closed string axions and infladrons (scalar chiral condensate excitations), which acquire dynamical masses. By employing the full power of the effective field theory, we investigate the applicability of these IR theories as inflationary models (natural, monodromy, Starobinsky) and connect different types of inflationary scenarios to different phases of the non-Abelian gauge theory or the Nambu-Jona-Lasinio four-fermion couplings. The back-reaction of the infladrons flattens the axion potential in natural-like inflationary models, such that the tension with current CMB data with respect to the spectral index and the tensor-to-scalar ratio can be partially alleviated.

    ↳ hep-thastro-ph.COhep-phJHEP(2018)·9 citations
19. 19*

    Consistency of an alternative CPT-odd and Lorentz-violating extension of QED

    J. C. C. Felipe🇧🇷 · H. G. Fargnoli🇧🇷 · A. P. Baeta Scarpelli🇧🇷 · L. C. T. Brito🇧🇷

    We investigate an alternative CPT-odd Lorentz-breaking QED which includes the Carroll-Field-Jackiw (CFJ) term of the Standard Model Extension (SME), writing the gauge sector in the action in a Palatini-like form, in which the vectorial field and the field-strength tensor are treated as independent entities. Interestingly, this naturally induces a Lorentz-violating mass term in the classical action. We study physical consistency aspects of the model both at classical and quantum levels.

    ↳ hep-thhep-exhep-phInt.J.Mod.Phys.A(2019)·4 citations
20. 20*

    Testing charm quark thermalisation within the Statistical Hadronisation Model

    A. Andronic🇩🇪 · P. Braun-Munzinger🇩🇪 · M. K. Koehler🇩🇪 · J. Stachel🇩🇪

    A wealth of data on charmonium production in Pb-Pb collisions from the LHC experiments has provided strong evidence for (re-)generation as a dominant production mechanism at low transverse momentum. We present an important extension of the statistical hadronisation model to describe $\mathrm{J}/\psi$ transverse momentum distributions based on input parameters from hydrodynamical simulations. Comparison to the data allows the testing of the degree of thermalisation of charm quarks in the quark-gluon plasma. To this end we will report analyses of the $\mathrm{J}/\psi$ transverse momentum spectra in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ and $5.02$ TeV.

    ↳ nucl-thhep-phNPA(2019)·19 citations
21. 21*

    Small and hollow magnetic monopoles

    D. Bazeia🇧🇷 · M.A. Marques🇧🇷 · Gonzalo J. Olmo🇧🇷

    We deal with the presence of magnetic monopoles in a non Abelian model that generalizes the standard 't~Hooft-Polyakov model in three spatial dimensions. We investigate the energy density of the static and spherically symmetric solutions to find first order differential equations that solve the equations of motion. The system is further studied and two distinct classes of solutions are obtained, one that can also be described by analytical solutions which is called small monopole, since it is significantly smaller than the standard 't~Hooft-Polyakov monopole. The other type of structure is the hollow monopole, since the energy density is endowed with a hole at its core. The hollow monopole can be smaller or larger than the standard monopole, depending on the value of the parameter that controls the magnetic permeability of the model.

    ↳ hep-thcond-mat.otherhep-phnlin.PSPRD(2018)·19 citations
22. 22*

    An F-theory Realization of the Chiral MSSM with ${\mathbb{Z}}_2$-Parity

    Mirjam Cvetič🇺🇸 · Ling Lin🇺🇸 · Muyang Liu🇺🇸 · Paul-Konstantin Oehlmann🇺🇸

    Using F-theory we construct 4D $\mathcal{N}=1$ SUGRA theories with the Standard Model gauge group, three chiral generations, and matter parity in order to forbid all dimension four baryon and lepton number violating operators. The underlying geometries are derived by constructing smooth genus-one fibered Calabi--Yau fourfolds using toric tops that have a Jacobian fibration with rank one Mordell--Weil group and $SU(3)\times SU(2)$ singularities. The necessary gauge backgrounds on the smooth fourfolds are shown to be fully compatible with the quantization condition, including positive integer D3-tadpoles. This construction realizes for the first time a consistent UV completion of an MSSM-like model with matter parity in F-theory. Moreover our construction is general enough to also exhibit other relevant ${\mathbb{Z}}_2$ charge extensions of the MSSM such as lepton and baryon parity. Such models however are rendered inconsistent by non-integer fluxes, which are necessary for producing the exact MSSM chiral spectrum. These inconsistencies turn out to be intimately related to field theory considerations regarding a UV-embedding of the ${\mathbb{Z}}_2$ into a $U(1)$ and the resulting discrete anomalies.

    ↳ hep-thhep-phJHEP(2018)·35 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.