HEP Phenomenology·hep-ph

Thu·Jan 18, 2018Thursday·January 18, 2018

19 papers—13 primary·6 cross-listed·reconstructed*

01*
MeV Dark Matter Complementarity and the Dark Photon Portal
Maíra Dutra🇫🇷 · Manfred Lindner🇩🇪 · Stefano Profumo🇺🇸 · Farinaldo S. Queiroz🇧🇷 · Werner Rodejohann🇩🇪 · Clarissa Siqueira🇧🇷
We discuss the phenomenology of an MeV-scale Dirac fermion coupled to the Standard Model through a dark photon with kinetic mixing with the electromagnetic field. We compute the dark matter relic density and explore the interplay of direct detection and accelerator searches for dark photons. We show that precise measurements of the temperature and polarization power spectra of the Cosmic Microwave Background Radiation lead to stringent constraints, leaving a small window for the thermal production of this MeV dark matter candidate. The forthcoming MeV gamma-ray telescope e-ASTROGAM will offer important and complementary opportunities to discover dark matter particles with masses below 10 MeV. Lastly, we discuss how a late-time inflation episode and freeze-in production could conspire to yield the correct relic density while being consistent with existing and future constraints.
hep-phJCAP(2018)·72 citations
02*
BFKL and Sudakov Resummation in Higgs Boson Plus Jet Production with Large Rapidity Separation
Bo-Wen Xiao🇨🇳 · Feng Yuan🇺🇸
We investigate the QCD resummation for the Higgs boson plus a high $P_{T}$ jet production with large rapidity separations in proton-proton collisions at the LHC. The relevant Balitsky-Fadin-Kuraev-Lipatov (BFKL) and Sudakov logs are identified and resummed. In particular, we apply recent developments of the transverse momentum dependent factorization formalism in the impact factors, which provides a systematic framework to incorporate both the BFKL and Sudakov resummations.
hep-phPLB(2018)·29 citations
03*
Comprehensive asymmetric dark matter model
Stephen J. Lonsdale🇦🇺 · Raymond R. Volkas🇦🇺
Asymmetric dark matter (ADM) is motivated by the similar cosmological mass densities measured for ordinary and dark matter. We present a comprehensive theory for ADM that addresses the mass density similarity, going beyond the usual ADM explanations of similar number densities. It features an explicit matter-antimatter asymmetry generation mechanism, has one fully worked out thermal history and suggestions for other possibilities, and meets all phenomenological, cosmological and astrophysical constraints. Importantly, it incorporates a deep reason for why the dark matter mass scale is related to the proton mass, a key consideration in ADM models. Our starting point is the idea of mirror matter, which offers an explanation for dark matter by duplicating the standard model with a dark sector related by a $Z_{2}$ parity symmetry. However, the dark sector need not manifest as a symmetric copy of the standard model in the present day. By utilising the mechanism of "asymmetric symmetry breaking" with two Higgs doublets in each sector, we develop a model of ADM where the mirror symmetry is spontaneously broken, leading to an electroweak scale in the dark sector that is significantly larger than that of the visible sector. The weak sensitivity of the ordinary and dark QCD confinement scales to their respective electroweak scales leads to the necessary connection between the dark matter and proton masses. The dark matter is composed of either dark neutrons or a mixture of dark neutrons and metastable dark hydrogen atoms. Lepton asymmetries are generated by the $C P$ -violating decays of heavy Majorana neutrinos in both sectors. These are then converted by sphaleron processes to produce the observed ratio of visible to dark matter in the universe. The dynamics responsible for the kinetic decoupling of the two sectors emerges as an important issue that we only partially solve.
hep-phPRD(2018)·46 citations
04*
Minimal Dark Matter in the Local $B - L$ Extension
Chengfeng Cai🇨🇳 · Zhaofeng Kang🇨🇳 · Hong-Hao Zhang🇨🇳 · Yupan Zeng🇨🇳
The minimal gauge group extension to the standard model (SM) by the local $U (1)_{B - L}$ (MBLSM) is well known as the minimal model to understand neutrino mass origins via the seesaw mechanism, following the gauge principle. This "small" symmetry also has deep implication to another big thing, dark matter (DM) stability. We demonstrate it in the framework of minimal dark matter (MDM), which aims at addressing two basic questions on DM, stability and the nature of interactions. However, stability and perturbativity may only allow the fermionic quintuplet. The situation is very different in the MBLSM, which leaves the subgroup of $U (1)_{B - L}$ , the matter parity $(- 1)^{3 (B - L)}$ , unbroken; it is able to stabilize all of the weakly-interacting {MDM candidates } after assigning a proper $U (1)_{B - L}$ charge. For the candidates with nonzero hypercharge, the phenomenological challenge comes from realizing the inelastic DM scenario thus evading the very strict DM direct detention bounds. We present two approaches that can slightly split the CP-even and -odd parts of the neutral components: 1) using the dimension 5 operators, which works for the $U (1)_{B - L}$ spontaneously breaking at very high scale; 2) mixing with {other fields} having zero hypercharge, which instead works for a low $U (1)_{B - L}$ breaking scale.
hep-phPLB(2018)·10 citations
05*
Neutrino non-standard interactions as a portal to test flavour symmetries
TseChun Wang🇬🇧 · Ye-Ling Zhou🇬🇧
Imposing non-Abelian discrete flavour symmetries to neutrino non-standard interactions (NSIs) is discussed for the first time. For definiteness, we choose $A_{4}$ as the flavour symmetry, which is subsequently broken to the residual symmetry $Z_{2}$ in the neutrino sector. We provide a general discussion on flavour structures of NSIs from higher-dimensional operators ( $d ⩽ 8$ ) without inducing unnecessary tree-level 4-charged-fermion interactions. Both $A_{4}$ - and $Z_{2}$ -motivated NSI textures are obtained. UV completions of higher-dimensional operators lead to extra experimental constraints on NSI textures. We study the implementation of matter-effect NSIs in DUNE from phenomenological point of view, and discover that DUNE can test $A_{4}$ with a high level of statistics. We also present exclusion limits of sum rules suggested by UV-complete models. Our result shows that the NSI effects, though predicted to be small for DUNE, could provide useful information that might extend our understanding of the flavour symmetry.
hep-phPRD(2019)·12 citations
06*
Quantum Field Theory and the Electroweak Standard Model
Andrej B. Arbuzov🇷🇺
Lecture notes with a brief introduction to Quantum field theory and the Standard Model are presented. The lectures were given at the 2017 European School of High-Energy Physics. The main features, the present status, and problems of the Standard Model are discussed.
hep-ph27 citations
07*
CutLang: A Particle Physics Analysis Description Language and Runtime Interpreter
Sezen Sekmen🇰🇷 · Gokhan Unel🇺🇸
This note introduces CutLang, a domain specific language that aims to provide a clear, human readable way to define analyses in high energy particle physics (HEP) along with an interpretation framework of that language. A proof of principle (PoP) implementation of the CutLang interpreter, achieved using C++ as a layer over the CERN data analysis framework ROOT, is presently available. This PoP implementation permits writing HEP analyses in an unobfuscated manner, as a set of commands in human readable text files, which are interpreted by the framework at runtime. We describe the main features of CutLang and illustrate its usage with two analysis examples. Initial experience with CutLang has shown that a just-in-time interpretation of a human readable HEP specific language is a practical alternative to analysis writing using compiled languages such as C++.
hep-phComput.Phys.Commun.(2018)·23 citations
08*
Probing the BSM physics with CMB precision cosmology: an application to supersymmetry
Ioannis Dalianis🇬🇷 · Yuki Watanabe🇯🇵
The cosmic history before the BBN is highly determined by the physics that operates beyond the Standard Model (BSM) of particle physics and it is poorly constrained observationally. Ongoing and future precision measurements of the CMB observables can provide us with significant information about the pre-BBN era and hence possibly test the cosmological predictions of different BSM scenarios. Supersymmetry is a particularly motivated BSM theory and it is often the case that different superymmetry breaking schemes require different cosmic histories with specific reheating temperatures or low entropy production in order to be cosmologically viable. In this paper we quantify the effects of the possible alternative cosmic histories on the $n_{s}$ and $r$ CMB observables assuming a generic non-thermal stage after cosmic inflation. We analyze TeV and especially multi-TeV supersymmetry breaking schemes assuming the neutralino and gravitino dark matter scenarios. We complement our analysis considering the Starobinsky $R^{2}$ inflation model to exemplify the improved CMB predictions that a unified description of the early universe cosmic evolution yields. Our analysis underlines the importance of the CMB precision measurements that can be viewed, to some extend, as complementary to the laboratory experimental searches for supersymmetry or other BSM theories.
hep-phastro-ph.COhep-thJHEP(2018)·13 citations
09*
Flavor-Safe Light Squarks in Higgs-Anomaly Mediation
Tsutomu T. Yanagida🇯🇵 · Wen Yin🇨🇳 · Norimi Yokozaki🇯🇵
We consider a simple setup with light squarks which is free from the gravitino and SUSY flavor problems. In our setup, a SUSY breaking sector is sequestered from the matter and gauge sectors, and it only couples to the Higgs sector directly with $O (100)$ TeV gravitino. Resulting mass spectra of sfermions are split: the first and second generation sfermions are light as $O (1)$ TeV while the third generation sfermions are heavy as $O (10)$ TeV. The light squarks of $O (1)$ TeV can be searched at the (high-luminosity) LHC and future collider experiments. Our scenario can naturally avoid too large flavor-changing neutral currents and it is consistent with the $ϵ_{K}$ constraint. Moreover, there are regions explaining the muon $g - 2$ anomaly and bottom-tau/top-bottom-tau Yukawa coupling unification simultaneously.
hep-phJHEP(2018)·25 citations
10*
Soft-gluon and Coulomb corrections to hadronic top-quark pair production beyond NNLO
Jan Piclum🇩🇪 · Christian Schwinn🇩🇪
We construct a resummation at partial next-to-next-to-next-to-leading logarithmic accuracy for hadronic top-quark pair production near partonic threshold, including simultaneously soft-gluon and Coulomb corrections, and use this result to obtain approximate next-to-next-to-next-to-leading order predictions for the total top-quark pair-production cross section at the LHC. We generalize a required one-loop potential in non-relativistic QCD to the colour-octet case and estimate the remaining unknown two-loop potentials and three-loop anomalous dimensions. We obtain a moderate correction of $1.5%$ relative to the next-to-next-to-leading order prediction and observe a reduction of the perturbative uncertainty below $\pm 5%$ .
hep-phhep-exJHEP(2018)·19 citations
11*
Cosmology and Accelerator Tests of Strongly Interacting Dark Matter
Asher Berlin🇺🇸 · Nikita Blinov🇺🇸 · Stefania Gori🇺🇸 · Philip Schuster🇺🇸 · Natalia Toro🇺🇸
A natural possibility for dark matter is that it is composed of the stable pions of a QCD-like hidden sector. Existing literature largely assumes that pion self-interactions alone control the early universe cosmology. We point out that processes involving vector mesons typically dominate the physics of dark matter freeze-out and significantly widen the viable mass range for these models. The vector mesons also give rise to striking signals at accelerators. For example, in most of the cosmologically favored parameter space, the vector mesons are naturally long-lived and produce Standard Model particles in their decays. Electron and proton beam fixed-target experiments such as HPS, SeaQuest, and LDMX can exploit these signals to explore much of the viable parameter space. We also comment on dark matter decay inherent in a large class of previously considered models and explain how to ensure dark matter stability.
hep-phhep-exPRD(2018)·133 citations
12*
Baryon spectrum of SU(4) composite Higgs theory with two distinct fermion representations
Venkitesh Ayyar🇺🇸 · Thomas DeGrand🇺🇸 · Daniel C. Hackett🇺🇸 · William I. Jay🇺🇸 · Ethan T. Neil🇺🇸 · Yigal Shamir🇮🇱 · Benjamin Svetitsky🇮🇱
We use lattice simulations to compute the baryon spectrum of SU(4) lattice gauge theory coupled to dynamical fermions in the fundamental and two-index antisymmetric (sextet) representations simultaneously. This model is closely related to a composite Higgs model in which the chimera baryon made up of fermions from both representations plays the role of a composite top-quark partner. The dependence of the baryon masses on each underlying fermion mass is found to be generally consistent with a quark-model description and large-Nc scaling. We combine our numerical results with experimental bounds on the scale of the new strong sector to derive a lower bound on the mass of the top partner.
hep-phhep-latPRD(2018)·91 citations
13*
Keung-Senjanović process at LHC: from LNV to displaced vertices to invisible decays
Miha Nemevšek🇸🇮 · Fabrizio Nesti🇮🇹 · Goran Popara🇭🇷
In the context of Left-Right symmetry, we revisit the Keung-Senjanović production of right-handed $W_{R}$ bosons and heavy neutrinos $N$ at high energy colliders. We develop a multi-binned sensitivity measure and use it to estimate the sensitivity for the entire range of $N$ masses, spanning the standard and merged prompt signals, displaced vertices and the invisible $N$ region. The estimated sensitivity of the LHC with 300/fb integrated luminosity ranges from 5 to beyond 7 TeV, while the future 33(100) TeV collider's reach with 3/ab extends to 12(26) TeV.
hep-phhep-exPRD(2018)·110 citations
14*
Domain Walls and the $C P$ Anomaly in Softly Broken Supersymmetric QCD
Patrick Draper🇺🇸
In ordinary QCD with light, degenerate, fundamental flavors, $C P$ symmetry is spontaneously broken at $θ = π$ , and domain wall solutions connecting the vacua can be constructed in chiral perturbation theory. In some cases the breaking of $C P$ saturates an 't Hooft anomaly, and anomaly inflow requires nontrivial massless excitations on the domain walls. Analogously, $C P$ can be spontaneously broken in supersymmetric QCD with light flavors and small soft breaking parameters. We study $C P$ breaking and domain walls in softly broken SQCD with $N_{f} < N$ flavors. Relative to ordinary QCD, the supersymmetric case contains an extra light field, the $η^{'}$ , which has interesting effects on the structure of the walls. Vanishing of the $C P$ anomaly is associated with the existence of multiple domain wall trajectories through field space, including walls which support no nontrivial massless excitations. In cases with an anomaly such walls are forbidden, and their absence in the relevant SQCD theories can be seen directly from the geometry of the low energy field space. In the case $N_{f} = N - 1$ , multiple approximately-BPS walls connect the vacua. Corrections to their tensions can be computed at leading order in the soft breaking parameters, producing a phase diagram for the stable wall trajectory. We also comment on domain walls in the similar case of QCD with an adjoint and fundamental flavors, and on the impact of adding an axion in this theory.
↳ hep-thhep-phPRD(2018)·18 citations
15*
On the jets emitted by driven Bose-Einstein condensates
Miguel Arratia🇺🇸
Features of the emission of jets by driven Bose-Einstein condensates, discovered by Clark et al. (Nature 551, 356359), can be understood by drawing analogies with particle physics. In particular, the widening of the $Δ ϕ = π$ peak in the angular correlation function is due to a dijet acollinearity, which I estimate to be about 5 $^{\circ}$ RMS. I also propose new correlation studies using observables commonly used in studies of the quark-gluon plasma.
↳ cond-mat.quant-gashep-exhep-phnucl-ex+1J.Phys.B(2019)·0 citations
16*
Infinite Set of Soft Theorems in Gauge-Gravity Theories as Ward-Takahashi Identities
Yuta Hamada🇯🇵 · Gary Shiu🇺🇸
We show that the soft photon, gluon and graviton theorems can be understood as the Ward-Takahashi identities of large gauge transformation, i.e., diffeomorphism that does not fall off at spatial infinity. We found infinitely many new identities which constrain the higher order soft behavior of the gauge bosons and gravitons in scattering amplitudes of gauge and gravity theories. Diagrammatic representations of these soft theorems are presented.
↳ hep-thhep-phPRL(2018)·125 citations
17*
Observation of Coherent Elastic Neutrino-Nucleus Scattering by COHERENT
Kate Scholberg🇺🇸
The COHERENT collaboration measured coherent elastic neutrino-nucleus scattering (CEvNS) for the first time at the Spallation Neutron Source at Oak Ridge National Laboratory, using a CsI[Na] detector. Here we discuss the nature of the CEvNS process, physics motivations, and experimental considerations for measuring CEvNS. We describe the CsI[Na] measurement, along with status and future of COHERENT.
↳ hep-exastro-ph.SRhep-phnucl-ex+1PoS(2018)·25 citations
18*
Scaling properties of spectra in new exact solutions of rotating, multi-component fireball hydrodynamics
T. Csörgő🇭🇺 · G. Kasza🇭🇺
We describe fireballs that rehadronize from a perfect fluid of quark matter, characterized by the lattice QCD equation of state, to a chemically frozen, multi-component mixture, that contains various kinds of observable hadrons. For simplicity and clarity, we apply a non-relativistic approximation to describe the kinematics of this expansion. Unexpectedly, we identify a secondary explosion that may characterize fireball hydrodynamics at the QCD critical point. After rehadronization, the multi-component mixture of hadrons keeps on rotating and expanding together, similarly to a single component fluid. After kinetic freeze-out, the effective temperature $T_{i}$ of the single-particle spectra of hadron type $h_{i}$ is found to be a sum of the kinetic freeze-out temperature $T_{f}$ (that is independent of the hadron type $h_{i}$ ) and a term proportional to the mass $m_{i}$ of hadron type $h_{i}$ . The coefficient of proportionality to $m_{i}$ is also found to be independent of the hadron type $h_{i}$ but be dependent on the radial flow and vorticity of collective dynamics.
↳ nucl-thhep-phnucl-exUniverse(2018)·7 citations
19*
Searching for stochastic background of ultra-light fields with atomic sensors
Tigran Kalaydzhyan🇺🇸 · Nan Yu🇺🇸
We propose a cross-correlation method for the searches of ultra-light fields, in particular, with a space network of atomic sensors. The main motivation of the approach is cancellation of uncorrelated noises in the observation data and unique pattern the fields leave on the cross-spectrum, depending on their nature (i.e., scalar, vector or tensor). In particular, we analytically derive a dependence of the cross-spectrum on the angle between two pairs of detectors. We then confirm obtained angular curves with a numerical simulation. We imply application of the method to the detection of dark matter and gravitational waves.
↳ astro-ph.COastro-ph.HEgr-qchep-ph+1Universe(2018)·4 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.