Fri·Feb 12, 2016Friday·February 12, 2016

1. 01*

   Hierarchy sensitivity of NO$\nu$A in light of T2K ${\nu }_e$ appearance data

   Suman Bharti🇮🇳 · Suprabh Prakash🇮🇳 · Ushak Rahaman🇮🇳 · S. Uma Sankar🇮🇳

   The ${\nu }_e$ appearance data of T2K experiment has given a glimpse of the allowed parameters in the hierarchy-${\delta }_{CP}$ parameter space. In this paper, we explore how this data affects our expectations regarding the hierarchy sensitivity of the NO$\nu$A experiment. For the favourable combinations of hierarchy and ${\delta }_{CP}$, the hierarchy sensitivity of NO$\nu$A is unaffected by the addition of T2K data. For the unfavourable combinations, NO$\nu$A data gives degenerate solutions. Among these degenerate solutions, T2K data prefers IH and ${\delta }_{CP}$ in the lower half plane over NH and ${\delta }_{CP}$ in the upper half plane. Hence, addition of the T2K data to NO$\nu$A creates a bias towards IH and ${\delta }_{CP}$ in the lower half plane irrespective of what the true combination is.

   hep-ph6 citations
2. 02*

   Invisible $K_L$ decays in the SM extensions

   S.N. Gninenko🇷🇺 · N.V. Krasnikov🇷🇺

   In the Standard Model (SM) the branching ratio for the decay $K_L\to \nu \bar{\nu }$ into two neutrinos is helicity suppressed and predicted to be very small $\le O(10^{-17})$. We consider two natural extensions of the SM, such as two-Higgs-doublet model (2HDM) and the $\nu$MSM with additional singlet scalar, those main features is that they can lead to an enhanced $Br(K_L\to invisible)$. In the 2HDM the smallness of the neutrino mass is explained due to the smallness of the second Higgs doublet vacuum expectation value. Moreover, the $\nu$MSM extension with additional singlet field can explain the $(g-2)$ muon anomaly. The considered models demonstrate that the $K_L\to invisible$ decay is a clean probe of new physics scales well above 100 TeV, that is complementary to rare $K\to \pi +invisible$ decay, and provide a strong motivation for its sensitive search in a near future low-energy experiment.

   hep-phhep-exMod.Phys.Lett.A(2016)·12 citations
3. 03*

   Light-Front Quark Model Analysis of Meson-Photon Transition Form Factor

   Ho-Meoyng Choi (Kyungpook National University)🇰🇷 · Chueng-Ryong Ji (North Carolina State University)🇺🇸

   We discuss $({\pi }^0,\eta ,{\eta }^{\prime })\to {\gamma }^{\ast }\gamma$ transition form factors using the light-front quark model. Our discussion includes the analysis of the mixing angles for $\eta -{\eta }^{\prime }$. Our results for $Q^2{F}_{({\pi }^0,\eta ,{\eta }^{\prime })\to {\gamma }^{\ast }\gamma }(Q^2)$ show scaling behavior for high $Q^2$ consistent with pQCD predictions.

   hep-phFew Body Syst.(2016)·3 citations
4. 04*

   Diphotons, New Vacuum Angles, and Strong CP

   Patrick Draper🇺🇸 · David McKeen🇺🇸

   The Standard Model contains a well-understood, natural, spin-0 diphoton resonance: the ${\pi }^0$. Numerous studies have pointed out that the hint of a new diphoton resonance at 750 GeV could be a pion analog, identified with the pseudo-Nambu-Goldstone boson of a chiral symmetry spontaneously broken by new strong dynamics at the TeV scale. These "hypercolor" models are generically expected to violate parity through a topological angle $\tilde{\theta }$. We discuss the physics of $\tilde{\theta }$ and its impact on the phenomenology of the new sector. We also describe some of the theoretical implications of a nonzero $\tilde{\theta }$. In particular, $\tilde{\theta }$ can generate an $\mathcal{O}(1)$ threshold correction to the QCD vacuum angle $\theta$ near the TeV scale, sharply constraining ultraviolet solutions to the strong CP problem. Alternatively, finding that $\tilde{\theta }$ is small may be interpreted as evidence in favor of UV solutions to strong CP, particularly those based on spontaneously broken P or CP symmetries.

   hep-phJHEP(2016)·29 citations
5. 05*

   Radiative Seesaw-type Mechanism of Fermion Masses and Non-trivial Quark Mixing

   Carolina Arbeláez🇨🇱 · A. E. Cárcamo Hernández🇨🇱 · Sergey Kovalenko🇨🇱 · Ivan Schmidt🇨🇱

   We propose a predictive inert 2 Higgs doublet model, where the Standard Model (SM) symmetry is extended by $S_3\otimes Z_2\otimes Z_{12}$ and the field content is enlarged by extra scalar fields, charged exotic fermions and two heavy right-handed Majorana neutrinos. The charged exotic fermions generate a nontrivial quark mixing and provide one-loop-level masses for the first- and second-generation charged fermions. The masses of the light active neutrinos are generated from a one loop-level radiative seesaw mechanism. Our model successfully explains the observed SM fermion mass and mixing pattern.

   hep-phEPJC(2017)·69 citations
6. 06*

   Pomeron pole plus grey disk model: real parts, inelastic cross sections and LHC data

   S. M. Roy (HBCSE, Tata Institute of Fundamental Research, Mumbai)🇮🇳

   I propose a two component analytic formula $F(s,t)=F^{(1)}(s,t)+F^{(2)}(s,t)$ for $(ab\to ab)+(a\bar{b}\to a\bar{b})$ scattering at energies $\ge 100GeV$ ,where $s,t$ denote squares of c.m. energy and momentum transfer.It saturates the Froissart-Martin bound and obeys Auberson-Kinoshita-Martin (AKM) \cite{AKM1971} scaling. I choose $Im{F}^{(1)}(s,0)+Im{F}^{(2)}(s,0)$ as given by Particle Data Group (PDG) fits to total cross sections. The PDG formula is extended to non-zero momentum transfers using partial waves of $Im{F}^{(1)}$ and $Im{F}^{(2)}$ motivated by Pomeron pole and 'grey disk' amplitudes . $ReF(s,t)$ is deduced from real analyticity: I prove that $ReF(s,t)/ImF(s,0)\to (\pi /\ln s)d/d\tau (\tau ImF(s,t)/ImF(s,0))$ for $s\to \infty$ with $\tau =t(lns{)}^2$ fixed, and apply it to $F^{(2)}$.Using also the forward slope fit by Schegelsky-Ryskin , the model gives real parts,differential cross sections for $(-t)<.3Ge{V}^2$, and inelastic cross sections in good agreement with data at $546GeV,1.8TeV,7TeV$ and $8TeV$. It predicts for inelastic cross sections for $pp$ or $\bar{p}p$, ${\sigma }_{inel}=72.7\pm 1.0mb$ at $7TeV$ and $74.2\pm 1.0mb$ at $8TeV$ in agreement with $pp$ Totem experimental values $73.1\pm 1.3mb$ and $74.7\pm 1.7mb$ respectively, and with Atlas values $71.3\pm 0.9mb$ and $71.7\pm 0.7mb$ respectively. The predictions at $546GeV$ and $1800GeV$ also agree with $\bar{p}p$ experimental results of Abe et al \cite{Abe} at $546GeV$ and $1800GeV$. The model yields for $\sqrt{s}>0.5TeV$, with PDG2013 total cross sections , and Schegelsky-Ryskin slopes as input, ${\sigma }_{inel}(s)=22.6+.034lns+.158(lns{)}^{2}mb,and{\sigma }_{inel}/{\sigma }_{tot}\to 0.56,s\to \infty ,$ where $s$ is in $Ge{V}^2$

   hep-phPLB(2017)·16 citations
7. 07*

   Critical Temperature of Chiral Symmetry Restoration for Quark Matter with a Chiral Chemical Potential

   M. Ruggieri🇨🇳 · G. X. Peng🇨🇳

   In this article we study restoration of chiral symmetry at finite temperature for quark matter with a chiral chemical potential, ${\mu }_5$, by means of a quark-meson model with vacuum fluctuations included. Vacuum fluctuations give a divergent contribution to the vacuum energy, so the latter has to be renormalized before computing physical quantities. The vacuum term is important for restoration of chiral symmetry at finite temperature and ${\mu }_5\ne 0$, therefore we present several plausible renormalization schemes for the ultraviolet divergences at ${\mu }_5\ne 0$. Then we compute the critical temperature as a function of ${\mu }_5$. The main result of our study is that the choice of a renormalization scheme affects the critical temperature; among the three renormalization schemes we investigate, there exists one in which the critical temperature increases with ${\mu }_5$, a result which has not been found before by chiral model studies and which is in qualitative agreement with recent lattice data as well as with studies based on Schwinger-Dyson equations and universality arguments.

   hep-phhep-lat12 citations
8. 08*

   Diphoton Excess and Running Couplings

   Kyu Jung Bae🇯🇵 · Motoi Endo🇯🇵 · Koichi Hamaguchi🇯🇵 · Takeo Moroi🇯🇵

   The recently observed diphoton excess at the LHC may suggest the existence of a singlet (pseudo-) scalar particle with a mass of 750 GeV which couples to gluons and photons. Assuming that the couplings to gluons and photons originate from loops of fermions and/or scalars charged under the Standard Model gauge groups, we show that here is a model-independent upper bound on the cross section $\sigma (pp\to S\to \gamma \gamma )$ as a function of the cutoff scale $\Lambda$ and masses of the fermions and scalars in the loop. Such a bound comes from the fact that the contribution of each particle to the diphoton event amplitude is proportional to its contribution to the one-loop $\beta$ functions of the gauge couplings. We also investigate the perturbativity of running Yukawa couplings in models with fermion loops, and show the upper bounds on $\sigma (pp\to S\to \gamma \gamma )$ for explicit models.

   hep-phhep-exPLB(2016)·40 citations
9. 09*

   A non-supersymmetric model with unification of electro-weak and strong interactions

   Roberto Frezzotti🇮🇹 · Marco Garofalo🇬🇧 · Giancarlo Rossi🇮🇹

   In this note we present an example of an extension of the Standard Model where unification of strong and electroweak interactions occurs at a level comparable to that occurring in the minimal supersymmetric standard model.

   hep-phhep-thPRD(2016)·14 citations
10. 10*

    Characteristics of Cherenkov Radiation in Naturally Occuring Ice

    R.E. Mikkelsen🇩🇰 · T. Poulsen🇩🇰 · U.I. Uggerhøj🇩🇰 · S.R. Klein🇺🇸

    We revisit the theory of Cherenkov radiation in uniaxial crystals. Historically, a number of flawed attempts have been made at explaining this radiation phenomenon and a consistent error-free description is nowhere available. We apply our calculation to a large modern day telescope - IceCube. Being located at the Antarctica, this detector makes use of the naturally occuring ice as a medium to generate Cherenkov radiation. However, due to the high pressure at the depth of the detector site, large volumes of hexagonal ice crystals are formed. We calculate how this affects the Cherenkov radiation yield and angular dependence. We conclude that the effect is small, at most about a percent, and would only be relevant in future high precision instruments like e.g. Precision IceCube Next Generation Upgrade (PINGU). For radio-Cherenkov experiments which use the presence of a clear Cherenkov cone to determine the arrival direction, any variation in emission angle will directly and linearly translate into a change in apparent neutrino direction. In closing, we also describe a simple experiment to test this formalism, and calculate the impact of anisotropy on light-yields from lead tungstate crystals as used, for example, in the CMS calorimeter at the CERN LHC.

    hep-phhep-exPRD(2016)·0 citations
11. 11*

    On the precision of a data-driven estimate of the pseudoscalar-pole contribution to hadronic light-by-light scattering in the muon g-2

    Andreas Nyffeler🇩🇪

    The evaluation of the numerically dominant pseudoscalar-pole contribution to hadronic light-by-light scattering in the muon g-2 involves the pseudoscalar-photon transition form factor F_{P gamma^* gamma^*}(-Q_1^2, -Q_2^2) with P = pi^0, eta, eta^\prime and, in general, two off-shell photons with spacelike momenta Q_{1,2}^2. We determine which regions of photon momenta give the main contribution for hadronic light-by-light scattering. Furthermore, we analyze how the precision of future measurements of the single- and double-virtual form factor impacts the precision of a data-driven estimate of this contribution to hadronic light-by-light scattering.

    hep-phEPJ Web Conf.(2016)·3 citations
12. 12*

    Gravity loop corrections to the standard model Higgs in Einstein gravity

    Yugo Abe🇯🇵 · Masaatsu Horikoshi🇯🇵 · Takeo Inami🇯🇵

    We study one-loop quantum gravity corrections to the standard model Higgs potential $V(\varphi )$ $\grave{\mathrm{a}}$ la Coleman-Weinberg and examine the stability question of $V(\varphi )$ in the energy region of Planck mass scale, $\mu \simeq M_{\mathrm{Pl}}$ ($M_{\mathrm{Pl}}=1.22\times 10^{19}\mathrm{GeV}$). We calculate the gravity one-loop corrections to $V(\varphi )$ in Einstein gravity by using the momentum cut-off $\Lambda$. We have found that even small gravity corrections compete with the standard model term of $V(\varphi )$ and affect the stability argument of the latter part alone. This is because the latter part is nearly zero in the energy region of $M_{\mathrm{Pl}}$.

    hep-phhep-thCommun.in Phys.(2017)·12 citations
13. 13*

    Hard exclusive pion leptoproduction

    Peter Kroll🇩🇪

    In this talk it is reported on an analysis of hard exclusive leptoproduction of pions within the handbag approach. It is argued that recent measurements of this process performed by HERMES and CLAS clearly indicate the occurrence of strong contributions from transversely polarized photons. Within the handbag approach such gamma*_T -> pi transitions are described by the transversity GPDs accompanied by twist-3 pion wave functions. It is shown that the handbag approach leads to results on cross sections and single-spin asymmetries in fair agreement with experiment. Predictions for other pseudoscalar meson channels are also briefly discussed.8 pages

    hep-phFew Body Syst.(2016)·11 citations
14. 14*

    Lepton flavor violation with light vector bosons

    Julian Heeck🇧🇪

    New sub-GeV vector bosons with couplings to muons but not electrons have been discussed in order to explain the muon's magnetic moment, the gap of high-energy neutrinos in IceCube or the proton radius puzzle. If such a light Z' not only violates lepton universality but also lepton flavor, as expected for example from the recent hint for $h\to \mu \tau$ at CMS, the two-body decay mode $\tau \to \mu Z^{\prime }$ opens up and for $M_{Z^{\prime }}<2m_{\mu }$ gives better constraints than $\tau \to 3\mu$ already with 20-year-old ARGUS limits. We discuss the general prospects and motivation of light vector bosons with lepton-flavor-violating couplings.

    hep-phhep-exPLB(2016)·95 citations
15. 15*

    Results on the Spin-Dependent Scattering of Weakly Interacting Massive Particles on Nucleons from the Run 3 Data of the LUX Experiment

    LUX Collaboration: D. S. Akerib🇺🇸 · H. M. Araújo🇬🇧 · X. Bai🇺🇸 · A. J. Bailey🇬🇧 · J. Balajthy🇺🇸 · P. Beltrame🇬🇧 · E. P. Bernard🇺🇸 · A. Bernstein🇺🇸 · T. P. Biesiadzinski🇺🇸 · E. M. Boulton🇺🇸 · A. Bradley🇺🇸 · R. Bramante🇺🇸 and 89 other authors

    We present the first experimental constraints on the spin-dependent WIMP-nucleon elastic cross sections from LUX data acquired in 2013. LUX is a dual-phase xenon time projection chamber operating at the Sanford Underground Research Facility (Lead, South Dakota), which is designed to observe the recoil signature of galactic WIMPs scattering from xenon nuclei. A profile likelihood ratio analysis of $1.4\times 10^4\text{kg}\cdot \text{days}$ of fiducial exposure allows 90% CL upper limits to be set on the WIMP-neutron (WIMP-proton) cross section of ${\sigma }_n=9.4\times 10^{-41}{\text{cm}}^2$ (${\sigma }_p=2.9\times 10^{-39}{\text{cm}}^2$) at 33 GeV/c${}^2$. The spin-dependent WIMP-neutron limit is the most sensitive constraint to date.

    ↳ hep-exhep-phPRL(2016)·245 citations
16. 16*

    Tau Now

    Daniele Fargion🇮🇹 · Pietro Oliva🇮🇹

    UHECR and UHE neutrino map correlation seem to most inconclusive. We show here that a few peculiar UHECR narrow clustering might be connected to a first UHE muon neutrino tracks. Moreover we discuss the best filtered and amplified UHE neutrino astronomy painted by up-going tau airshower. Their discover by new projects could be reached soon.

    ↳ astro-ph.HEastro-ph.COastro-ph.IMhep-phNucl.Part.Phys.Proc.(2016)·2 citations
17. 17*

    Inhomogeneous Anisotropic Cosmology

    Matthew Kleban🇺🇸 · Leonardo Senatore🇺🇸

    In homogeneous and isotropic Friedmann-Robertson-Walker cosmology, the topology of the universe determines its ultimate fate. If the Weak Energy Condition is satisfied, open and flat universes must expand forever, while closed cosmologies can recollapse to a Big Crunch. A similar statement holds for homogeneous but anisotropic (Bianchi) universes. Here, we prove that $arbitrarily$ inhomogeneous and anisotropic cosmologies with "flat" (including toroidal) and "open" (including compact hyperbolic) spatial topology that are initially expanding must continue to expand forever at least in some region at a rate bounded from below by a positive number, despite the presence of arbitrarily large density fluctuations and/or the formation of black holes. Because the set of 3-manifold topologies is countable, a single integer determines the ultimate fate of the universe, and, in a specific sense, most 3-manifolds are "flat" or "open". Our result has important implications for inflation: if there is a positive cosmological constant (or suitable inflationary potential) and initial conditions for the inflaton, cosmologies with "flat" or "open" topology must expand forever in some region at least as fast as de Sitter space, and are therefore very likely to begin inflationary expansion eventually, regardless of the scale of the inflationary energy or the spectrum and amplitude of initial inhomogeneities and gravitational waves. Our result is also significant for numerical general relativity, which often makes use of periodic (toroidal) boundary conditions.

    ↳ hep-thastro-ph.COgr-qchep-phJCAP(2016)·83 citations
18. 18*

    Two worlds collide: Interacting shells in AdS spacetime and chaos

    Richard Brito🇵🇹 · Vitor Cardoso🇵🇹 · Jorge V. Rocha🇪🇸

    We study the simplest two-body problem in asymptotically anti-de Sitter spacetime: two, infinitely thin, concentric spherical shells of matter. We include only gravitational interaction between the two shells, but we show that the dynamics of this system is highly nontrivial. We observe prompt collapse to a black hole, delayed collapse and even perpetual oscillatory motion, depending on the initial location of the shells (or their energy content). The system exhibits critical behavior, and we show strong hints that it is also chaotic.

    ↳ hep-thgr-qchep-phPRD(2016)·20 citations
19. 19*

    Toward a consistent evolution of the quark-gluon plasma and heavy quarks

    Marlene Nahrgang🇺🇸 · Jörg Aichelin🇫🇷 · Pol Bernard Gossiaux🇫🇷 · Klaus Werner🇫🇷

    Heavy-quark observables in ultrarelativistic heavy-ion collisions, like the nuclear modification factor and the elliptic flow, give insight into the mechanisms of high-momentum suppression and low-momentum thermalization of heavy quarks. Here, we present a global study of these two observables within a coupled approach of the heavy-quark propagation in a realistic fluid dynamical medium, MC@sHQ+EPOS2, and compare to experimental data from RHIC and LHC experiments. The heavy quarks scatter elastically and inelastically with the quasiparticles of the quark-gluon plasma (QGP), which are represented consistently with the underlying equation of state. We examine two scenarios: first, we interpret the lattice QCD equation of state as a sum of partonic and hadronic contributions, and second, as a gas of massive partonic quasiparticles. It is observed that independent of their momentum the energy loss of heavy quarks depends strongly on how the lattice QCD equation of state is translated into degrees of freedom of the QGP.

    ↳ nucl-thhep-phPRC(2016)·36 citations
20. 20*

    $B_{(s)}^0$-mixing matrix elements from lattice QCD for the Standard Model and beyond

    A. Bazavov🇺🇸 · C. Bernard🇺🇸 · C. M. Bouchard🇺🇸 · C. C. Chang🇺🇸 · C. DeTar🇺🇸 · Daping Du🇺🇸 · A. X. El-Khadra🇺🇸 · E. D. Freeland🇺🇸 · E. Gamiz🇪🇸 · Steven Gottlieb🇺🇸 · U. M. Heller🇺🇸 · A. S. Kronfeld🇺🇸 and 8 other authors

    We calculate---for the first time in three-flavor lattice QCD---the hadronic matrix elements of all five local operators that contribute to neutral $B^0$- and $B_s$-meson mixing in and beyond the Standard Model. We present a complete error budget for each matrix element and also provide the full set of correlations among the matrix elements. We also present the corresponding bag parameters and their correlations, as well as specific combinations of the mixing matrix elements that enter the expression for the neutral $B$-meson width difference. We obtain the most precise determination to date of the SU(3)-breaking ratio $\xi =1.206(18)(6)$, where the second error stems from the omission of charm sea quarks, while the first encompasses all other uncertainties. The threefold reduction in total uncertainty, relative to the 2013 Flavor Lattice Averaging Group results, tightens the constraint from $B$ mixing on the Cabibbo-Kobayashi-Maskawa (CKM) unitarity triangle. Our calculation employs gauge-field ensembles generated by the MILC Collaboration with four lattice spacings and pion masses close to the physical value. We use the asqtad-improved staggered action for the light valence quarks, and the Fermilab method for the bottom quark. We use heavy-light meson chiral perturbation theory modified to include lattice-spacing effects to extrapolate the five matrix elements to the physical point. We combine our results with experimental measurements of the neutral $B$-meson oscillation frequencies to determine the CKM matrix elements $|V_{td}|=8.00(34)(8)\times 10^{-3}$, $|V_{ts}|=39.0(1.2)(0.4)\times 10^{-3}$, and $|V_{td}/V_{ts}|=0.2052(31)(10)$, which differ from CKM-unitarity expectations by about 2$\sigma$. These results and others from flavor-changing-neutral currents point towards an emerging tension between weak processes that are mediated at the loop and tree levels.

    ↳ hep-lathep-phPRD(2016)·272 citations
21. 21*

    On the potential of multivariate techniques for the determination of multidimensional efficiencies

    Benoit Viaud🇫🇷

    Differential measurements of particle collisions or decays can provide stringent constraints on physics beyond the Standard Model of particle physics. In particular, the distributions of the kinematical and angular variables that characterise heavy me- son multibody decays are non trivial and can sign the underlying interaction physics. In the era of high luminosity opened by the advent of the Large Hadron Collider and of Flavor Factories, differential measurements are less and less dominated by statistical precision and require a precise determination of efficiencies that depend simultaneously on several variables and do not factorise in these variables. This docu- ment is a reflection on the potential of multivariate techniques for the determination of such multidimensional efficiencies. We carried out two case studies that show that multilayer perceptron neural networks can determine and correct for the distortions introduced by reconstruction and selection criteria in the multidimensional phase space of the decays $B^0\to K^{\ast 0}(\to K^{+}{\pi }^{-}){\mu }^{+}{\mu }^{-}$ and $D^0\to K^{-}{\pi }^{+}{\pi }^{+}{\pi }^{-}$, at the price of a minimal analysis effort. We conclude that this method can already be used for measurements which statistical precision does not yet reach the percent level and that with more sophisticated machine learning methods, the aforementioned potential is very promising.

    ↳ physics.data-anhep-exhep-phEur.Phys.J.Plus(2016)·4 citations
22. 22*

    On methods for correcting for the look-elsewhere effect in searches for new physics

    Sara Algeri🇬🇧 · David A. van Dyk🇬🇧 · Jan Conrad🇸🇪 · Brandon Anderson🇸🇪

    The search for new significant peaks over a energy spectrum often involves a statistical multiple hypothesis testing problem. Separate tests of hypothesis are conducted at different locations producing an ensemble of local p-values, the smallest of which is reported as evidence for the new resonance. Unfortunately, controlling the false detection rate (type I error rate) of such procedures may lead to excessively stringent acceptance criteria. In the recent physics literature, two promising statistical tools have been proposed to overcome these limitations. In 2005, a method to "find needles in haystacks" was introduced by Pilla et al. [1], and a second method was later proposed by Gross and Vitells [2] in the context of the "look elsewhere effect" and trial factors. We show that, for relatively small sample sizes, the former leads to an artificial inflation of statistical power that stems from an increase in the false detection rate, whereas the two methods exhibit similar performance for large sample sizes. We apply the methods to realistic simulations of the Fermi Large Area Telescope data, in particular the search for dark matter annihilation lines. Further, we discuss the counter-intutive scenario where the look-elsewhere corrections are more conservative than much more computationally efficient corrections for multiple hypothesis testing. Finally, we provide general guidelines for navigating the tradeoffs between statistical and computational efficiency when selecting a statistical procedure for signal detection.

    ↳ physics.data-anastro-ph.HEhep-exhep-ph+1JINST(2016)·24 citations
23. 23*

    A review of the discovery reach of directional Dark Matter detection

    F. Mayet🇫🇷 · A. M. Green🇬🇧 · J. B. R. Battat🇺🇸 · J. Billard🇫🇷 · N. Bozorgnia🇳🇱 · G. B. Gelmini🇺🇸 · P. Gondolo🇺🇸 · B. J. Kavanagh🇫🇷 · S. K. Lee🇺🇸 · D. Loomba🇺🇸 · J. Monroe🇬🇧 · B. Morgan🇬🇧 and 4 other authors

    Cosmological observations indicate that most of the matter in the Universe is Dark Matter. Dark Matter in the form of Weakly Interacting Massive Particles (WIMPs) can be detected directly, via its elastic scattering off target nuclei. Most current direct detection experiments only measure the energy of the recoiling nuclei. However, directional detection experiments are sensitive to the direction of the nuclear recoil as well. Due to the Sun's motion with respect to the Galactic rest frame, the directional recoil rate has a dipole feature, peaking around the direction of the Solar motion. This provides a powerful tool for demonstrating the Galactic origin of nuclear recoils and hence unambiguously detecting Dark Matter. Furthermore, the directional recoil distribution depends on the WIMP mass, scattering cross section and local velocity distribution. Therefore, with a large number of recoil events it will be possible to study the physics of Dark Matter in terms of particle and astrophysical properties. We review the potential of directional detectors for detecting and characterizing WIMPs.

    ↳ astro-ph.COhep-phphysics.ins-detPhys.Rept.(2016)·292 citations
24. 24*

    Event-by-event hydrodynamics $+$ jet energy loss: A solution to the $R_{AA}\otimes v_2$ puzzle

    Jacquelyn Noronha-Hostler (Houston U.)🇺🇸 · Barbara Betz (Frankfurt U.)🇩🇪 · Jorge Noronha (Sao Paulo U.)🇧🇷 · Miklos Gyulassy (LBNL, NSD and Columbia U. and CCNU, Wuhan, Inst. Part. Phys.)🇺🇸

    High $p_T>10$ GeV elliptic flow, which is experimentally measured via the correlation between soft and hard hadrons, receives competing contributions from event-by-event fluctuations of the low $p_T$ elliptic flow and event plane angle fluctuations in the soft sector. In this paper, a proper account of these event-by-event fluctuations in the soft sector, modeled via viscous hydrodynamics, is combined with a jet energy loss model to reveal that the positive contribution from low $p_T$ $v_2$ fluctuations overwhelms the negative contributions from event plane fluctuations. This leads to an enhancement of high $p_T>10$ GeV elliptic flow in comparison to previous calculations and provides a natural solution to the decade long high $p_T$ $R_{AA}\otimes v_2$ puzzle. We also present the first theoretical calculation of high $p_T$ $v_3$, which is shown to be compatible with current LHC data. Furthermore, we discuss how short wavelength jet-medium physics can be deconvoluted from the physics of soft, bulk event-by-event flow observables using event shape engineering techniques.

    ↳ nucl-thhep-phnucl-exPRL(2016)·140 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.