CERN Accelerating science

TH Articles

Darreres entrades:
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.- 2019-08-15 - 7 p. - Published in : Phys. Lett. B 798 (2019) 134927 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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2019-07-18
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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2019-07-11
04:38
An analytic solution for the equal-mass banana graph / Broedel, Johannes (Humboldt U., Berlin) ; Duhr, Claude (CERN ; Louvain U., CP3) ; Dulat, Falko (SLAC) ; Marzucca, Robin (Louvain U., CP3) ; Penante, Brenda (CERN) ; Tancredi, Lorenzo (CERN)
We present fully analytic results for all master integrals for the three-loop banana graph with four equal and non-zero masses. The results are remarkably simple and all integrals are expressed as linear combinations of iterated integrals of modular forms of uniform weight for the same congruence subgroup as for the two-loop equal-mass sunrise graph. [...]
arXiv:1907.03787; CP3-19-34; CERN-TH-2019-105; HU-Mathematik-2019-04; HU-EP-19/20, SLAC-PUB-17453.- 2019-09-16 - 36 p. - Published in : JHEP 1909 (2019) 112 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-07-10
04:09
Effect of non-eikonal corrections on azimuthal asymmetries in the Color Glass Condensate / Agostini, Pedro (Santiago de Compostela U., IGFAE) ; Altinoluk, Tolga (NCBJ, Warsaw) ; Armesto, Néstor (Santiago de Compostela U., IGFAE ; CERN)
We analyse the azimuthal structure of two gluon correlations in the Color Glass Condensate including those effects that result from relaxing the shockwave approximation for the target. Working in the Glasma graph approach suitable for collisions between dilute systems, we compute numerically the azimuthal distributions and show that both even and odd harmonics appear. [...]
arXiv:1907.03668; CERN-TH-2019-102.- 2019-09-24 - 18 p. - Published in : Eur. Phys. J. C 79 (2019) 790 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-07-04
05:02
Properties of Dual Supertranslation Charges in Asymptotically Flat Spacetimes / Kol, Uri (New York U., CCPP) ; Porrati, Massimo (New York U., CCPP ; CERN)
We study several properties of some new charges of asymptotically flat spacetimes. These dual supertranslation charges are akin to the magnetic large $U(1)$ charges in QED. [...]
arXiv:1907.00990; CERN-TH-2019-069.- 2019-08-29 - 19 p. - Published in : Phys. Rev. D 100 (2019) 046019 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-06-30
05:00
Using Forward-Backward Drell-Yan Asymmetry in PDF Determinations / Fiaschi, Juri (Munster U., ITP) ; Accomando, Elena (Southampton U.) ; Hautmann, Francesco (Oxford U. ; CERN) ; Moretti, Stefano (Southampton U.)
We study the impact of the inclusion of Neutral Current (NC) DY data from LHC mapped in the Forward-Backward Asymmetry ($A_{\rm FB}$) observable on PDF uncertainties, using the open source platform \texttt{xFitter}. We find that $A_{\rm FB}$ enables new PDF sensitivity at current and future luminosity stages of LHC..
arXiv:1906.11793; MS-TP-19-16; CERN-TH-2019-100.- SISSA, 2019-07-20 - 6 p. - Published in : PoS DIS2019 (2019) 012 Fulltext: 1906.11793 - PDF; PoS(DIS2019)012 - PDF;
In : The XXVII International Workshop on Deep Inelastic Scattering and Related Subjects, Turin, Italy, 8 - 12 Apr 2019, pp.012

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2019-06-30
05:00
On the direct determination of $\sin^2 \theta^\ell_{eff}$ at hadron colliders / Chiesa, Mauro (Wurzburg U.) ; Piccinini, Fulvio (INFN, Pavia) ; Vicini, Alessandro (CERN ; Milan U. ; INFN, Milan)
We discuss the renormalization of the electroweak Standard Model at 1-loop using the leptonic effective weak mixing angle as one of the input parameters. We evaluate the impact of this choice in the prediction of the forward-backward asymmetry for the neutral current Drell-Yan process. [...]
arXiv:1906.11569; CERN-TH-2019-092.- 2019-10-07 - 6 p. - Published in : Phys. Rev. D 100 (2019) 071302 Article from SCOAP3: PDF; Fulltext: PDF;

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2019-06-29
04:02
Dynamical Friction in Interacting Relativistic Systems / Katz, Andrey (CERN ; Geneva U., CAP) ; Kurkela, Aleksi (CERN ; Stavanger U.) ; Soloviev, Alexander (Vienna, Tech. U.)
We study dynamical friction in interacting relativistic systems with arbitrary mean free paths and medium constituent masses. Our novel framework recovers the known limits of ideal gas and ideal fluid when the mean free path goes to infinity or zero, respectively, and allows for a smooth interpolation between these limits. [...]
arXiv:1906.05341; CERN-TH-2019-088.- 2019-08-14 - 33 p. - Published in : JCAP 2019 (2019) 017 Fulltext: PDF;

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2019-06-27
05:04
Unified No-Scale Attractors / Ellis, John (King's Coll. London ; CERN ; NICPB, Tallinn) ; Nanopoulos, Dimitri V. (TAMU, College Station ; HARC, Woodlands ; Athens Academy) ; Olive, Keith A. (Minnesota U.) ; Verner, Sarunas (Minnesota U.)
We have presented previously a general treatment of Starobinsky-like inflation in no-scale supergravity where the tensor-to-scalar ratio $r = 3(1 - n_s)^2$, and $n_s$ is the tilt of the scalar perturbations. In particular, we have shown how this scenario can be unified with modulus fixing, supersymmetry breaking and a small cosmological constant. [...]
arXiv:1906.10176; KCL-PH-TH/2019-51; CERN-TH-2019-089; ACT-03-19; MI-TH-1923; UMN-TH-3826/19; MI-TH-1923, UMN-TH-3826/19; FTPI-MINN-19/17.- 2019-09-20 - 32 p. - Published in : JCAP 1909 (2019) 040 Fulltext: PDF;

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