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2019-08-28
04:39
The effective energy density of relic gravitons / Giovannini, Massimo (CERN ; INFN, Milan Bicocca)
The energy density, the pressure and the anisotropic stress of the relic gravitons do not have a unique gauge-invariant and frame-invariant expression since the equivalence principle ultimately forbids the localization of the energy-momentum of the gravitational field. All the strategies proposed so far suggest compatible descriptions inside the effective horizon but they lead to sharply different answers when the wavelengths of the gravitons exceed the Hubble radius by remaining shorter than the typical extension of causally connected patches. [...]
arXiv:1908.09679; CERN-PH-TH-2019-131; CERN-TH-2019-131.- 2019-10-22 - 17 p. - Published in : Phys. Rev. D 100 (2019) 083531 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF;

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2019-08-19
04:44
A tale of two exponentiations in ${\cal N}=8$ supergravity / Di Vecchia, Paolo (Nordita ; Bohr Inst.) ; Luna, Andrés (UCLA) ; Naculich, Stephen G. (Bowdoin Coll.) ; Russo, Rodolfo (Queen Mary, U. of London) ; Veneziano, Gabriele (CERN ; College de France) ; White, Chris D. (Queen Mary, U. of London)
The structure of scattering amplitudes in supergravity theories continues to be of interest. Recently, the amplitude for $2\rightarrow 2$ scattering in ${\cal N}=8$ supergravity was presented at three-loop order for the first time. [...]
arXiv:1908.05603; BOW-PH-166; NORDITA 2019-076; QMUL-PH-19-20; CERN-TH-2019-133.- 2019-11-10 - 7 p. - Published in : Phys. Lett. B 798 (2019) 134927 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-08-14
05:35
Numerical exploration of three relativistic particles in a finite volume including two-particle resonances and bound states / Romero-López, Fernando (Valencia U., IFIC) ; Sharpe, Stephen R. (Washington U., Seattle) ; Blanton, Tyler D. (Washington U., Seattle) ; Briceño, Raúl A. (Jefferson Lab ; Old Dominion U.) ; Hansen, Maxwell T. (CERN)
In this work, we use an extension of the quantization condition, given in Ref. [1], to numerically explore the finite-volume spectrum of three relativistic particles, in the case that two-particle subsets are either resonant or bound. [...]
arXiv:1908.02411; JLAB-THY-19-3011; CERN-TH-2019-129.- 2019-10-03 - 42 p. - Published in : JHEP 1910 (2019) 007 Article from SCOAP3: PDF; Fulltext: PDF; External link: JLab Document Server

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2019-08-08
05:29
Black Hole Binary Dynamics from the Double Copy and Effective Theory / Bern, Zvi (UCLA ; CERN) ; Cheung, Clifford (Caltech, Pasadena (main)) ; Roiban, Radu (Penn State U., University Park, IGC) ; Shen, Chia-Hsien (UCLA) ; Solon, Mikhail P. (Caltech, Pasadena (main)) ; Zeng, Mao (Zurich, ETH)
We describe a systematic framework for computing the conservative potential of a compact binary system using modern tools from scattering amplitudes and effective field theory. Our approach combines methods for integration and matching adapted from effective field theory, generalized unitarity, and the double-copy construction, which relates gravity integrands to simpler gauge-theory expressions. [...]
arXiv:1908.01493; CERN-TH-2019-128; CALT-TH 2019-026; UCLA/TEP/2019/103.- 2019 - 135 p. - Published in : JHEP 1910 (2019) 206 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-07-30
04:38
Associated production of a Higgs boson decaying into bottom quarks and a weak vector boson decaying leptonically at NNLO in QCD / Gauld, R. (Nikhef, Amsterdam) ; Gehrmann-De Ridder, A. (Zurich, ETH ; Zurich U.) ; Glover, E.W.N. (Durham U., IPPP) ; Huss, A. (CERN) ; Majer, I. (Zurich, ETH)
We present the calculation of next-to-next-to-leading order (NNLO) corrections in perturbative QCD for the production of a Higgs boson decaying into a pair of bottom quarks in association with a leptonically decaying weak vector boson: $\mathrm{pp} \to V \mathrm{H} + X \to \ell\bar{\ell}\;\mathrm{b\bar{b}} + X$. We consider the corrections to both the production and decay sub-processes, retaining a fully differential description of the final state including off-shell propagators of the Higgs and vector boson. [...]
arXiv:1907.05836; NIKHEF 2019-030; ZU-TH 35/19; IPPP/19/61; CERN-TH-2019-113.- 2019-10-03 - 34 p. - Published in : JHEP 1910 (2019) 002 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-07-28
04:45
The dark matter bispectrum from effective viscosity and one-particle irreducible vertices / Floerchinger, Stefan (U. Heidelberg, ITP) ; Garny, Mathias (Munich, Tech. U.) ; Katsis, Aris (Athens U.) ; Tetradis, Nikolaos (Athens U.) ; Wiedemann, Urs Achim (CERN)
Dark matter evolution during the process of cosmological structure formation can be described in terms of a one-particle irreducible effective action at a characteristic scale $k_m$ and a loop expansion below this scale, based on the effective propagators and vertices. We calculate the form of the effective vertices and compute the bispectrum of density perturbations within a one-loop approximation. [...]
arXiv:1907.10729; CERN-TH-2019-122; TUM-HEP-1215/19.- 2019-09-23 - 24 p. - Published in : JCAP 1909 (2019) 047 Fulltext: PDF;

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2019-07-24
04:14
From Minkowski to de Sitter in Multifield No-Scale Models / Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Nagaraj, Balakrishnan (Texas A-M) ; Nanopoulos, Dimitri V. (Texas A-M ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U., Theor. Phys. Inst.) ; Verner, Sarunas (Minnesota U., Theor. Phys. Inst.)
We show the uniqueness of superpotentials leading to Minkowski vacua of single-field no-scale supergravity models, and the construction of dS/AdS solutions using pairs of these single-field Minkowski superpotentials. We then extend the construction to two- and multifield no-scale supergravity models, providing also a geometrical interpretation. [...]
arXiv:1907.09123; KCL-PH-TH/2019-62; CERN-TH-2019-119; ACT-04-19; MI-TH-1928, UMN-TH-3829/19; FTPI-MINN-19/20.- 2019-10-14 - 30 p. - Published in : JHEP 1910 (2019) 161 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-07-20
04:22
PDF Profiling Using the Forward-Backward Asymmetry in Neutral Current Drell-Yan Production / Accomando, Elena (Southampton U. ; Rutherford) ; Fiaschi, Juri (Munster U., ITP ; Southampton U. ; Rutherford) ; Hautmann, Francesco (Rutherford ; Antwerp U. ; Oxford U., Theor. Phys. ; U. Basque Country, Leioa ; CERN) ; Moretti, Stefano (Southampton U. ; Rutherford) ; Bertone, Valerio (Pavia U.) ; Giuli, Francesco (Rome U., Tor Vergata ; INFN, Rome2) ; Abdolmaleki, Hamen (Semnan U.) ; Luszczak, Agnieszka (Cracow Tech. U.) ; Glazov, Alexander (DESY) ; Olness, Fred (Southern Methodist U.) et al. /xFitter Developers' team
Non-perturbative QCD effects from Parton Distribution Functions (PDFs) may be constrained by using high-statistics Large Hadron Collider (LHC) data. Drell-Yan (DY) measurements in the Charged Current (CC) case provide one of the primary means to do this, in the form of the lepton charge asymmetry. [...]
arXiv:1907.07727; DESY-19-127; MS-TP-19-19; CERN-TH-2019-110.- 2019-10-15 - 21 p. - Published in : JHEP 1910 (2019) 176 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-07-19
04:20
Quantum Fishchain in $AdS_5$ / Gromov, Nikolay (King's Coll. London, Dept. Math ; St. Petersburg, INP) ; Sever, Amit (Tel Aviv U. ; CERN)
In our previous paper we derived the holographic dual of the planar fishnet CFT in four dimensions. The dual model becomes classical in the strongly coupled regime of the CFT and takes the form of an integrable chain of particles in five dimensions. [...]
arXiv:1907.01001; CERN-TH-2019-143.- 2019-10-08 - 39 p. - Published in : JHEP 1910 (2019) 085 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-07-18
05:08
Towards a determination of the low $x$ gluon via exclusive $J/\psi$ production / Flett, C.A. (Liverpool U., Dept. Math.) ; Jones, S.P. (CERN) ; Martin, A.D. (Durham U., IPPP) ; Ryskin, M.G. (Durham U., IPPP ; St. Petersburg, INP) ; Teubner, T. (Liverpool U., Dept. Math.)
We discuss how the stability of the theoretical prediction for exclusive $J/\psi$ photoproduction has been improved through a systematic taming of the known $\overline{\text{MS}}$ coefficient functions by accounting for a formally power suppressed, but numerically significant, correction encoded within a $Q_0$ cut. The phenomenological implications of this will be emphasised meaning, ultimately, the possibility to include the exclusive data into a global fitter framework to provide constraints on the small $x$ gluon..
arXiv:1907.06471; CERN-TH-2019-107; IPPP/19/53; LTH 1209.- SISSA, 2019-07-03 - 6 p. - Published in : PoS DIS2019 (2019) 053 Fulltext: PoS(DIS2019)053 - PDF; 1907.06471 - PDF;
In : The XXVII International Workshop on Deep Inelastic Scattering and Related Subjects, Turin, Italy, 8 - 12 Apr 2019, pp.053

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