Wed·Mar 9, 2016Wednesday·March 9, 2016

1. 01*

   A QCD sum rule calculation of the $X^{\pm }(5568)\to B_s^0{\pi }^{\pm }$ decay width

   J. M. Dias🇧🇷 · K. P. Khemchandani🇧🇷 · A. Martínez Torres🇧🇷 · M. Nielsen🇧🇷 · C. M. Zanetti🇧🇷

   To understand the nature of the $X(5568)$, recently observed in the mass spectrum of the $B_s^0{\pi }^{\pm }$ system by the D0 Collaboration, we have investigated, in a previous work, a scalar tetraquark (diquak-antidiquark) structure for it, within the two-point QCD sum rules method. The result found for its mass agrees well with the experimental value. Encouraged by this finding we now extend our calculations to obtain the decay width of $X(5568)$ to $B_s^0{\pi }^{\pm }$ using the three-point QCD sum rule. We obtain a value of $(20.4\pm 8.7)\text{MeV}$, which, on comparing with the experimental value of $21.9\pm 6.4(\text{mbox}sta{)}_{-2.5}^{+5.0}(\text{mbox}syst)\text{MeV}/c^2$, reinforces the scalar four quark nature of $X(5568)$.

   hep-phPLB(2016)·49 citations
2. 02*

   Jet azimuthal angle correlations in the production of a Higgs boson pair plus two jets at hadron colliders

   Junya Nakamura🇩🇪 · Julien Baglio🇩🇪

   Azimuthal angle correlations of two jets in the process $pp\to HHjj$ are studied. The loop induced $\mathcal{O}({\alpha }_s^4{\alpha }_{}^2)$ gluon fusion (GF) sub-process and the $\mathcal{O}({\alpha }_{}^4)$ weak boson fusion (WBF) sub-process are considered. The GF sub-process exhibits strong correlations in the azimuthal angles ${\varphi }_{1,2}^{}$ of the two jets measured from the production plane of the Higgs boson pair and the difference between these two angles ${\varphi }_1^{}-{\varphi }_2^{}$, and a very small correlation in the sum of them ${\varphi }_1^{}+{\varphi }_2^{}$. The impact of using a finite top mass $m_t^{}$ value on the correlations is found crucial. The transverse momentum of the Higgs boson can be used to enhance or suppress the correlations. The impact of a non-standard value for the triple Higgs self-coupling on the correlations is found much smaller than that on other observables, such as the invariant mass of the two Higgs bosons. The peak shifts of the azimuthal angle distributions reflect the magnitude of parity violation in the $gg\to HH$ amplitude and the dependence of the distributions on parity violating phases is analytically clarified. The WBF sub-process also produces correlated distributions and it is found that they are not induced by the quantum effect of the intermediate weak bosons but mainly by a kinematic effect. This kinematic effect is a characteristic feature of the WBF sub-process and is not observed in the GF sub-process. It is found that the correlations are different in the GF and in the WBF sub-processes. As part of the process dependent information, they will be helpful in the analyses of both the GF sub-process and the WBF sub-process at the LHC.

   hep-phhep-exEPJC(2017)·6 citations
3. 03*

   Dark Matter as a consequence of electric charge non-conservation - will it remain dark forever?

   Richard M. Weiner🇫🇷

   It is conjectured that dark matter (DM) was produced before inflation from neutral particles present after the Big Bang and survived inflation due to a specific coupling with gravitation, while the charged particles existing after the Big Bang disappeared during inflation in a process of charge non-conservation. Ordinary matter was produced at a later stage at a lower temperature following a symmetry restoring phase transition. In this way the non-luminous character of dark matter and the existence of two types of matter, ordinary and dark, get a natural explanation. Because of the high temperatures preceding inflation, the masses of particles produced during that time are too large to be detected by conventional particle physics methods and possibly will never be detected.

   hep-ph4 citations
4. 04*

   Leptonic CP phases near the $\mu -\tau$ symmetric limit

   Diana C. Rivera-Agudelo🇲🇽 · Abdel Pérez-Lorenzana🇲🇽

   The neutrino masses and mixings indicated by current neutrino oscillation experiments suggest that the neutrino mass matrix possesses an approximate $\mu -\tau$ exchange symmetry. In this study, we explore the neutrino parameter space and show that if a small $\mu -\tau$ symmetry breaking is considered, the Majorana $CP$ phases must be unequal and non-zero independently of the neutrino mass scale. Moreover, a small $\mu -\tau$ symmetry breaking favors quasi-degenerate masses. We also show that Majorana phases are strongly correlated with the Dirac $CP$ violating phase. Within this framework, we obtain robust predictions for the values of the Majorana phases when the experimental indications for the Dirac $CP$ phase are used.

   hep-phPLB(2016)·12 citations
5. 05*

   Coupled channel analysis of molecule picture of $P_c(4380)$

   Yuki Shimizu🇯🇵 · Daiki Suenaga🇯🇵 · Masayasu Harada🇯🇵

   We construct a potential obtained by one-pion exchange for the coupled channel ${\Sigma }_c^{\ast }$$\bar{D}$-${\Sigma }_c$${\bar{D}}^{\ast }$, and solve the coupled Schrödinger equations to determine the binding energy. We find that there exists one or two bound states with the binding energy of several MeV below the threshold of ${\Sigma }_c^{\ast }$ and $\bar{D}$, dominantly made from a ${\Sigma }_c^{\ast }$ baryon and a $\bar{D}$ meson, with the size of about $1.5$fm for wide parameter region. We also study the pentaquark states including a $b$ quark and/or an anti-$b$ quark. We show that there exist pentaquarks including $c\bar{b}$, $b\bar{c}$ and $b\bar{b}$, all of which lie at about $10$MeV below the corresponding threshold and have size of about $1.5$fm.

   hep-phnucl-thPRD(2016)·82 citations
6. 06*

   Gravitational Baryogenesis after Anisotropic Inflation

   Mitsuhiro Fukushima🇯🇵 · Shuntaro Mizuno🇯🇵 · Kei-ichi Maeda🇯🇵

   The gravitational baryogensis may not generate a sufficient baryon asymmetry in the standard thermal history of the Universe when we take into account the gravitino problem. Hence it has been suggested that anisotropy of the Universe can enhance the generation of the baryon asymmetry through the increase of the time change of the Ricci scalar curvature. We study the gravitational baryogenesis in the presence of anisotropy, which is produced at the end of an anisotropic inflation. Although we confirm that the generated baryon asymmetry is enhanced compared with the original isotropic cosmological model, taking into account the constraint on the anisotropy by the recent CMB observations, we find that it is still difficult to obtain the observed baryon asymmetry only through the gravitational baryogenesis without suffering from the gravitino problem.

   hep-phastro-ph.COgr-qchep-thPRD(2016)·34 citations
7. 07*

   New developments in exact amplitude-based resummation in precision theory vs experiment

   B.F.L. Ward (1)🇺🇸 · A. Mukhopadhyay (2) ((1) Baylor University, Waco, TX, USA, (2) IMSC, Chennai, IN)🇮🇳

   We present recent developments in the application of exact amplitude-based resummation methods in the confrontation between precision theory and recent experimental results. As a consequence, we argue that these methods open the way to 1\% total theoretical precision in LHC and FCC physics when realized via MC event generators.

   hep-phPoS(2016)·0 citations
8. 08*

   Neutrino-atom collisions

   Konstantin A. Kouzakov🇷🇺 · Alexander I. Studenikin🇷🇺

   Neutrino-atom scattering provides a sensitive tool for probing nonstandard interactions of massive neutrinos in laboratory measurements. The ionization channel of this collision process plays an important role in experiments searching for neutrino magnetic moments. We discuss some theoretical aspects of atomic ionization by massive neutrinos. We also outline possible manifestations of neutrino electromagnetic properties in coherent elastic neutrino-nucleus scattering.

   hep-phJ.Phys.Conf.Ser.(2016)·1 citation
9. 09*

   Analysis of the strong decay $X(5568)\to B_s^0{\pi }^{+}$ with QCD sum rules

   Zhi-Gang Wang🇨🇳

   In this article, we take the $X(5568)$ to be the scalar diquark-antidiquark type tetraquark state, study the hadronic coupling constant $g_{X{B}_s\pi }$ with the three-point QCD sum rules by carrying out the operator product expansion up to the vacuum condensates of dimension-6 and including both the connected and disconnected Feynman diagrams, then calculate the partial decay width of the strong decay $X(5568)\to B_s^0{\pi }^{+}$ and obtain the value ${\Gamma }_X=\left(20.5\pm 8.1\right)\mathrm{MeV}$, which is consistent with the experimental data ${\Gamma }_X=\left(21.9\pm 6.4{}_{-2.5}^{+5.0}\right)\mathrm{MeV}$ from the D0 collaboration.

   hep-phEPJC(2016)·50 citations
10. 10*

    On the pole content of coupled channels chiral approaches used for the $\bar{K}N$ system

    A. Cieplý🇨🇿 · M. Mai🇩🇪 · Ulf-G. Meißner🇩🇪 · J. Smejkal🇨🇿

    Several theoretical groups describe the antikaon-nucleon interaction at low energies within approaches based on the chiral SU(3) dynamics and including next-to-leading order contributions. We present a comparative analysis of the pertinent models and discuss in detail their pole contents. It is demonstrated that the approaches lead to very different predictions for the $K^{-}p$ amplitude extrapolated to subthreshold energies as well as for the $K^{-}n$ amplitude. The origin of the poles generated by the models is traced to the so-called zero coupling limit, in which the inter-channel couplings are switched off. This provides new insights into the pole contents of the various approaches. In particular, different concepts of forming the $\Lambda (1405)$ resonance are revealed and constraints related to the appearance of such poles in a given approach are discussed.

    hep-phnucl-thNPA(2016)·116 citations
11. 11*

    An Algebraic PT-Symmetric Quantum Theory with a Maximal Mass

    V. N. Rodionov🇷🇺 · G.A. Kravtsova🇷🇺

    In this paper we draw attention to the fact that the studies by V. G. Kadyshevsky devoted to the creation of the which \emph{\emph{to the geometric quantum field theory with a fundamental mass}} containing non-Hermitian mass extensions. It is important that these ideas recently received a powerful development in the form of construction of the non-Hermitian algebraic approach. The central point of these theories is the construction of new scalar products in which the average values of non-Hermitian Hamiltonians are valid. Among numerous works on this subject may be to allocate as purely mathematical and containing a discussion of experimental results. In this regard, we consider as the development of algebraic relativistic pseudo-Hermitian quantum theory with a maximal mass and experimentally significant investigations are discussed

    hep-phhep-thquant-phPhys.Part.Nucl.(2016)·4 citations
12. 12*

    Fluctuations as a test of chemical non-equilibrium at the LHC

    Viktor Begun🇵🇱

    It is shown that large chemical potential leads to the significant increase of multiplicity fluctuations for bosons, and makes the fluctuations infinite in the case of Bose-Einstein condensation. It allows to distinguish between the models that explain the anomalous proton to pion ratio and the low transverse momentum enhancement of pion spectra in Pb+Pb collisions at the LHC within chemical equilibrium or non-equilibrium models. The effects of resonance decays, finite size of the system, requirements to the event statistics, different momentum cuts, and limited detector acceptance are considered. The obtained results show the possibility to observe a substantial increase of the normalized kurtosis for positively or negatively charged pions in the case of non-equilibrium or partial pion condensation using currently measured data.

    ↳ nucl-thhep-phnucl-exPRC(2016)·28 citations
13. 13*

    Towards Kaluza-Klein Dark Matter on Nilmanifolds

    David Andriot🇩🇪 · Giacomo Cacciapaglia🇫🇷 · Aldo Deandrea🇫🇷 · Nicolas Deutschmann🇧🇪 · Dimitrios Tsimpis🇫🇷

    We present a first study of the field spectrum on a class of negatively-curved compact spaces: nilmanifolds or twisted tori. This is a case where analytical results can be obtained, allowing to check numerical methods. We focus on the Kaluza-Klein expansion of a scalar field. The results are then applied to a toy model where a natural Dark Matter candidate arises as a stable massive state of the bulk scalar.

    ↳ hep-thhep-phmath.SPJHEP(2016)·27 citations
14. 14*

    Evolution to the Quark-Gluon Plasma

    Kenji Fukushima🇯🇵

    Theoretical studies on the early-time dynamics in the ultra-relativistic heavy-ion collisions are reviewed including pedagogical introductions on the initial condition with small-x gluons treated as a color glass condensate, the bottom-up thermalization scenario, plasma/glasma instabilities, basics of some formulations such as the kinetic equations and the classical statistical simulation. More detailed discussions follow to make an overview of recent developments on the fast isotropization, the onset of hydrodynamics, and the transient behavior of momentum spectral cascades.

    ↳ nucl-thhep-phRept.Prog.Phys.(2017)·42 citations
15. 15*

    A novel mass generation scheme for an Abelian vector field

    Constantin Bizdadea🇷🇴 · Solange-Odile Saliu🇷🇴

    A novel mass generation procedure for an Abelian vector field is proposed. This procedure is based on the construction of a class of gauge theories whose free limit describes a free massless vector field and a set of massless real scalar fields by means of the antifield-BRST deformation technique. The relationship between our results and those arising from the Higgs mechanism based on the spontaneous symmetry breaking of an Abelian gauge symmetry is emphasized. Some examples with one, two, and three scalars are given.

    ↳ hep-thhep-phmath-phmath.MP6 citations
16. 16*

    Structure of Kähler potential for D-term inflationary attractor models

    Kazunori Nakayama🇯🇵 · Ken'ichi Saikawa🇩🇪 · Takahiro Terada🇰🇷 · Masahide Yamaguchi🇯🇵

    Minimal chaotic models of D-term inflation predicts too large primordial tensor perturbations. Although it can be made consistent with observations utilizing higher order terms in the Kähler potential, expansion is not controlled in the absence of symmetries. We comprehensively study the conditions of Kähler potential for D-term plateau-type potentials and discuss its symmetry. They include the alpha-attractor model with a massive vector supermultiplet and its generalization leading to pole inflation of arbitrary order. We extend the models so that it can describe Coulomb phase, gauge anomaly is cancelled, and fields other than inflaton are stabilized during inflation. We also point out a generic issue for large-field D-term inflation that the masses of the non-inflaton fields tend to exceed the Planck scale.

    ↳ hep-thastro-ph.COhep-phJHEP(2016)·14 citations
17. 17*

    Information Gain on Reheating: the One Bit Milestone

    Jerome Martin🇫🇷 · Christophe Ringeval🇧🇪 · Vincent Vennin🇬🇧

    We show that the Planck 2015 and BICEP2/KECK measurements of the Cosmic Microwave Background (CMB) anisotropies provide together an information gain of 0.82 +- 0.13 bits on the reheating history over all slow-roll single-field models of inflation. This corresponds to a 40% improvement compared to the Planck 2013 constraints on the reheating. Our method relies on an exhaustive CMB data analysis performed over nearly 200 models of inflation to derive the Kullback-Leibler entropy between the prior and the fully marginalized posterior of the reheating parameter. This number is a weighted average by the Bayesian evidence of each model to explain the data thereby ensuring its fairness and robustness.

    ↳ astro-ph.COgr-qchep-phhep-thPRD(2016)·65 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.