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2024-06-12
04:50
Self-interacting dark matter solves the final parsec problem of supermassive black hole mergers / Alonso-Álvarez, Gonzalo (Toronto U. ; McGill U.) ; Cline, James M. (McGill U. ; CERN) ; Dewar, Caitlyn (McGill U.)
Evidence for a stochastic gravitational wave (GW) background, plausibly originating from the merger of supermassive black holes (SMBHs), is accumulating with observations from pulsar timing arrays. An outstanding question is how inspiraling SMBHs get past the "final parsec" of separation, where they have a tendency to stall before GW emission alone can make the binary coalesce. [...]
arXiv:2401.14450; CERN-TH-2024-016.- 2024-07-09 - 5 p. - Published in : Phys. Rev. Lett. 133 (2024) 021401 Fulltext: PDF;

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2024-06-12
04:50
The non-first-order-factorizable contributions to the three-loop single-mass operator matrix elements <math altimg="si1.svg"><msubsup><mrow><mi>A</mi></mrow><mrow><mi>Q</mi><mi>g</mi></mrow><mrow><mo stretchy="false">(</mo><mn>3</mn><mo stretchy="false">)</mo></mrow></msubsup></math> and <math altimg="si2.svg"><mi mathvariant="normal">Δ</mi><msubsup><mrow><mi>A</mi></mrow><mrow><mi>Q</mi><mi>g</mi></mrow><mrow><mo stretchy="false">(</mo><mn>3</mn><mo stretchy="false">)</mo></mrow></msubsup></math> / Ablinger, J. (Linz U. ; Linz U., RISC ; OAW, Linz, RICAM) ; Behring, A. (CERN) ; Blümlein, J. (DESY, Zeuthen ; Dortmund U.) ; De Freitas, A. (Linz U. ; Linz U., RISC ; DESY, Zeuthen) ; von Manteuffel, A. (Regensburg U.) ; Schneider, C. (Linz U. ; Linz U., RISC) ; Schönwald, K. (Zurich U.)
The non-first-order-factorizable contributions (The terms 'first-order-factorizable contributions' and 'non-first-order-factorizable contributions' have been introduced and discussed in Refs. \cite{Behring:2023rlq,Ablinger:2023ahe}. [...]
arXiv:2403.00513; ZU-TH-13/24; DO-TH-23/15; RISC Report series 24-02; CERN-TH-2024-30; DESY-24-027.- 2024-05-13 - 8 p. Fulltext: 2403.00513 - PDF; Publication - PDF;

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2024-04-20
05:03
Two-loop integrals for $t \bar{t} +$jet production at hadron colliders in the leading colour approximation / Badger, Simon (INFN, Turin) ; Becchetti, Matteo (Bologna U. ; INFN, Bologna) ; Giraudo, Nicolò (Zurich U.) ; Zoia, Simone (CERN)
We compute the differential equations for the two remaining integral topologies contributing to the leading colour two-loop amplitudes for $pp \rightarrow t\bar{t}j$. We derive differential equations for the master integrals by solving the integration-by-parts identities over finite fields. [...]
arXiv:2404.12325; CERN-TH-2024-048; ZU-TH 22/24.- 2024-07-09 - 22 p. - Published in : JHEP 2407 (2024) 073 Fulltext: document - PDF; 2404.12325 - PDF;

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2024-04-06
04:07
Exploring scalar contributions with $K^+ \to \pi^+ \ell^+ \ell^-$ / D'Ambrosio, G. (INFN, Naples) ; Iyer, A.M. (Indian Inst. Tech., New Delhi) ; Mahmoudi, F. (IP2I, Lyon ; CERN ; IUF, Paris) ; Neshatpour, S. (IP2I, Lyon)
The rare kaon decay $K^+ \to \pi^+\ell^+\ell^-$ offers insights into Standard Model (SM) physics and beyond. Driven by vector form factor in the SM, it can also probe non-standard contributions. [...]
arXiv:2404.03643; CERN-TH-2024-044.- 2024-06-26 - 4 p. - Published in : Phys. Lett. B 855 (2024) 138824 Fulltext: Publication - PDF; 2404.03643 - PDF;

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2024-03-21
05:42
Soft Scalars in Effective Field Theory / Derda, Maria (Caltech) ; Helset, Andreas (CERN) ; Parra-Martinez, Julio (British Columbia U.)
We derive a soft theorem for a massless scalar in an effective field theory with generic field content using the geometry of field space. This result extends the geometric soft theorem for scalar effective field theories by allowing the massless scalar to couple to other scalars, fermions, and gauge bosons. [...]
arXiv:2403.12142; CALT-TH-2024-011; CERN-TH-2024-035.- 2024-06-19 - 28 p. - Published in : JHEP 2406 (2024) 133 Fulltext: document - PDF; 2403.12142 - PDF;

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2024-03-21
05:42
QCD effects in electroweak $WZjj$ production at current and future hadron colliders / Jäger, Barbara (Tubingen U.) ; Karlberg, Alexander (CERN) ; Reinhardt, Simon (Tubingen U.)
We present an update of an existing implementation of $WZjj$ production via vector-boson scattering in the framework of the POWHEG BOX program. In particular, previously unavailable semi-leptonic and fully hadronic decay modes of the intermediate vector bosons are provided, and operators of dimension six in an effective-field theory approach to account for physics beyond the Standard Model in the electroweak sector are included. [...]
arXiv:2403.12192; CERN-TH-2024-036.- 2024-06-08 - 22 p. - Published in : Eur. Phys. J. C 84 (2024) 587 Fulltext: document - PDF; 2403.12192 - PDF;

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2024-03-14
08:37
Conservative Black Hole Scattering at Fifth Post-Minkowskian and First Self-Force Order / Driesse, Mathias (Humboldt U., Berlin) ; Jakobsen, Gustav Uhre (Humboldt U., Berlin ; Potsdam, Max Planck Inst.) ; Mogull, Gustav (Humboldt U., Berlin ; Potsdam, Max Planck Inst.) ; Plefka, Jan (Humboldt U., Berlin) ; Benjamin Sauer (Humboldt U., Berlin) ; Usovitsch, Johann (CERN)
We compute the 5PM order contributions to the scattering angle and impulse of classical black hole scattering in the conservative sector at first self-force order (1SF) using the worldline quantum field theory formalism. This challenging four-loop computation required the use of advanced integration-by-parts and differential equation technology implemented on high-performance computing systems. [...]
arXiv:2403.07781; HU-EP-24/08-RTG; CERN-TH-2024-032.- 2024-06-13 - 12 p. - Published in : Phys. Rev. Lett. 132 (2024) 241402 Fulltext: 2403.07781 - PDF; Publication - PDF;

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2024-03-09
04:15
NNLO QCD corrections to the q$^{2}$ spectrum of inclusive semileptonic B-meson decays / Fael, Matteo (CERN) ; Herren, Florian (Zurich U.)
We calculate the next-to-next-to-leading order QCD corrections to the leptonic invariant mass ($q^2$) spectrum of semileptonic $b \to c$ inclusive decays, taking into account the mass of the charm quark and the charged lepton in the final state. We obtain analytic results in terms of generalized polylogarithms and present numerical studies of the $\mathcal{O}(\alpha_s^2)$ corrections to the $q^2$ spectrum of $b \to c \ell \bar \nu_\ell$ decays, for $\ell =e, \mu$ and $\tau$, in the kinetic scheme. [...]
arXiv:2403.03976; CERN-TH-2024-025; ZU-TH 14/24.- 2024-05-24 - 19 p. - Published in : JHEP 2405 (2024) 287 Fulltext: document - PDF; 2403.03976 - PDF;

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2024-02-23
04:42
di-Langlands correspondence and extended observables / Jeong, Saebyeok (CERN) ; Lee, Norton (IBS, Gyeongsangbuk, CGP) ; Nekrasov, Nikita (IHES, Bures-sur-Yvette ; Moscow, ITEP)
We explore the $\textit{difference Langlands correspondence}$ using the four dimensional ${\mathcal{N}}=2$ super-QCD. Surface defects and surface observables play the crucial role. [...]
arXiv:2402.13888; CERN-TH-2023-220; CGP24002.- 2024-06-18 - 11 p. - Published in : JHEP 2406 (2024) 105 Fulltext: document - PDF; 2402.13888 - PDF;

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2024-02-16
08:03
Small instanton-induced flavor invariants and the axion potential / Bedi, Ravneet (Minnesota U.) ; Gherghetta, Tony (Minnesota U.) ; Grojean, Christophe (DESY ; Humboldt U., Berlin ; CERN) ; Guedes, Guilherme (DESY) ; Kley, Jonathan (DESY ; Humboldt U., Berlin) ; Vuong, Pham Ngoc Hoa (DESY)
Small instantons which increase the axion mass due to an appropriate modification of QCD at a UV scale $\Lambda_{\rm SI}$, can also enhance the effect of CP-violating operators to shift the axion potential minimum by an amount, $\theta_{\rm ind}$, proportional to the flavorful couplings in the SMEFT. Since physical observables must be flavor basis independent, we construct a basis of determinant-like flavor invariants that arise from instanton calculations containing the effects of dimension-six CP-odd operators at the scale $\require{cancel}\Lambda_{\cancel{\rm CP}}$. [...]
arXiv:2402.09361; CERN-TH-2024-022; DESY-24-019; HU-EP-24/05; UMN--TH--4313/24.- 2024-06-24 - 49 p. - Published in : JHEP 2406 (2024) 156 Fulltext: document - PDF; 2402.09361 - PDF;

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