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2022-07-13
04:01
Flavour Physics Phenomenology with SuperIso / Neshatpour, Siavash (INFN, Naples) ; Mahmoudi, Farvah (IP2I, Lyon ; CERN)
We present an overview of SuperIso v4.1 which is a public program for the calculation of flavour physics observables. We give examples of using SuperIso to constrain new physics scenarios with kaon physics and present the implications of rare B-decays..
arXiv:2207.04956; CERN-TH-2022-119.- 2022-07-14 - 9 p. - Published in : PoS CompTools2021 (2022) 010 Fulltext: 2207.04956 - PDF; document - PDF;
In : Computational Tools for High Energy Physics and Cosmology, Lyon, France, 22 - 26 Nov 2021, pp.010

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2022-05-19
09:38
Single Photon Production at Hadron Colliders at NNLO QCD with Realistic Photon Isolation / Chen, X. (KIT, Karlsruhe, TP ; KIT, Karlsruhe, IAP) ; Gehrmann, T. (Zurich U.) ; Glover, E.W.N. (Durham U., IPPP) ; Höfer, M. (Munich U., ASC) ; Huss, A. (CERN) ; Schürmann, R. (Zurich U.)
Isolated photons at hadron colliders are defined by permitting only a limited amount of hadronic energy inside a fixed-size cone around the candidate photon direction. This isolation criterion admits contributions from collinear photon radiation off QCD partons and from parton-to-photon fragmentation processes. [...]
arXiv:2205.01516; ZU-TH 16/22; KA-TP-12-2022; P3H-22-044; IPPP/22/30; LMU-ASC 17/22; CERN-TH-2022-072.- 2022-08-05 - 43 p. - Published in : JHEP 08 (2022) 094 Fulltext: 2205.01516 - PDF; document - PDF;

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2022-05-12
04:52
dE/dx from boosted long-lived particles / Giudice, Gian F. (CERN) ; McCullough, Matthew (CERN) ; Teresi, Daniele (CERN)
At colliders massive long-lived charged particles could be revealed through their anomalously large ionisation energy loss $dE/dx$. In this paper we explore a class of scenarios in which the LLPs are particularly boosted, owing to production from the decay of a heavy parent resonance. [...]
arXiv:2205.04473; CERN-TH-2022-078.- 2022-08-01 - 18 p. - Published in : JHEP 2208 (2022) 012 Fulltext: document - PDF; 2205.04473 - PDF;

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2022-05-10
04:20
Higher-curvature Gravities from Braneworlds and the Holographic c-theorem / Bueno, Pablo (CERN) ; Emparan, Roberto (ICREA, Barcelona ; Barcelona, Autonoma U. ; ICC, Barcelona U.) ; Llorens, Quim (ICC, Barcelona U.)
We study the structure of the higher-curvature gravitational densities that are induced from holographic renormalization in AdS$_{d+1}$. In a braneworld construction, such densities define a d-dimensional higher-curvature gravitational theory on the brane, which in turn is dual to a (d-1)-dimensional CFT living at its boundary. [...]
arXiv:2204.13421; CERN-TH-2022-076.- 2022-08-03 - 17 p. - Published in : Phys. Rev. D 106 (2022) 044012 Fulltext: PhysRevD.106.044012 - PDF; 2204.13421 - PDF;

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2022-05-07
04:12
On the NLO QCD Corrections to Gluon-Initiated ZH Production / Degrassi, Giuseppe (CERN ; Rome III U. ; INFN, Rome3) ; Gröber, Ramona (Padua U. ; INFN, Padua) ; Vitti, Marco (Rome III U. ; INFN, Rome3) ; Zhao, Xiaoran (Rome III U. ; INFN, Rome3)
We compute the QCD corrections at next-to-leading order for the process $gg \rightarrow ZH$, including both the virtual two-loop terms and real-emission contributions. The two-loop box diagrams in the virtual corrections are approximated analytically over the complete phase space, combining the results of an expansion in the limit of small transverse momentum and an expansion in the regime of high energy. [...]
arXiv:2205.02769; CERN-TH-2022-079.- 2022-08-01 - 19 p. - Published in : JHEP 2208 (2022) 009 Fulltext: 2205.02769 - PDF; document - PDF;

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2022-04-28
04:03
Bootstrapping a Stress-Tensor Form Factor through Eight Loops / Dixon, Lance J. (SLAC) ; Gurdogan, Omer (Southampton U.) ; McLeod, Andrew J. (CERN ; UCLA ; Bohr Inst.) ; Wilhelm, Matthias (Bohr Inst.)
We bootstrap the three-point form factor of the chiral stress-tensor multiplet in planar $\mathcal{N}=4$ supersymmetric Yang-Mills theory at six, seven, and eight loops, using boundary data from the form factor operator product expansion. This may represent the highest perturbative order to which multi-variate quantities in a unitary four-dimensional quantum field theory have been computed. [...]
arXiv:2204.11901; SLAC-PUB-17653; CERN-TH-2022-039.- 2022-07-26 - 43 p. - Published in : JHEP 2207 (2022) 153 Fulltext: 2204.11901 - PDF; document - PDF;

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2022-04-23
10:51
Constraints on multifield inflation from the BOSS galaxy survey / Cabass, Giovanni (Princeton, Inst. Advanced Study) ; Ivanov, Mikhail M. (Princeton, Inst. Advanced Study) ; Philcox, Oliver H.E. (Princeton U., Astrophys. Sci. Dept. ; Princeton, Inst. Advanced Study) ; Simonović, Marko (CERN) ; Zaldarriaga, Matias (Princeton, Inst. Advanced Study)
We use redshift-space galaxy clustering data from the BOSS survey to constrain local primordial non-Gaussianity (LPNG). This is of particular importance due to the consistency relations, which imply that a detection of LPNG would rule out all single-field inflationary models. [...]
arXiv:2204.01781; CERN-TH-2022-055.- 2022-08-03 - 21 p. - Published in : Phys. Rev. D 106 (2022) 043506 Fulltext: PDF;

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2022-04-07
04:32
The eikonal operator at arbitrary velocities I: the soft-radiation limit / Di Vecchia, Paolo (Bohr Inst. ; Nordita ; Stockholm U.) ; Heissenberg, Carlo (Nordita ; Stockholm U. ; Uppsala U.) ; Russo, Rodolfo (Queen Mary, U. of London) ; Veneziano, Gabriele (CERN ; College de France)
Observables related to the real part of the gravitational eikonal, such as the deflection angle and time delay, have been found so far to have a smooth post-Minkowskian (PM) expansion whose validity extends from the non-relativistic to the most extreme ultra-relativistic (UR) regime, which smoothly connects with massless particle collisions. To describe gravitational radiation, the eikonal phase has to be promoted to a unitary operator for which we motivate a proposal and start discussing properties in the soft-radiation limit. [...]
arXiv:2204.02378; CERN-TH-2022-058; NORDITA 2022-022; QMUL-PH-22-14; UUITP-20/22.- 2022-07-07 - 31 p. - Published in : JHEP 2207 (2022) 039 Fulltext: document - PDF; 2204.02378 - PDF;

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2022-04-02
04:37
Light-by-Light Scattering at Future $e^+e^-$ Colliders / Ellis, John (King's Coll. London ; NICPB, Tallinn ; CERN) ; Mavromatos, Nick E. (King's Coll. London ; Natl. Tech. U., Athens) ; Roloff, Philipp (CERN) ; You, Tevong (CERN ; Cambridge U., DAMTP ; Cambridge U.)
We study the sensitivity of possible CLIC and FCC-ee measurements of light-by-light scattering to old and new physics, including the Heisenberg-Euler Lagrangian in the Standard Model with possible contributions from loops of additional charged particles or magnetic monopoles, the Born-Infeld extension of QED, and effective dimension-8 operators involving four electromagnetic field strengths as could appear in the Standard Model Effective Field Theory. We find that FCC-ee measurements at 365 GeV and CLIC measurements at 350 GeV would be sensitive to new physics scales of half a TeV in the dimension-8 operator coefficients, and that CLIC measurements at 1.4 TeV or 3 TeV would be sensitive to new physics scales {$\sim 2$ TeV or 5 TeV} at 95% CL, corresponding to probing loops of new particles with masses up to $\sim 3.7$ TeV {for large charges and/or multiple species}. [...]
arXiv:2203.17111; KCL-PH-TH/2022-02; CERN-TH-2022-011.- 2022-07-23 - 26 p. - Published in : Eur. Phys. J. C Fulltext: document - PDF; 2203.17111 - PDF;

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2022-03-25
08:48
The dark side of the proton / McCullough, Matthew (CERN) ; Moore, James (Cambridge U.) ; Ubiali, Maria (Cambridge U.)
We study the sensitivity of the High-Luminosity LHC to a light baryonic dark photon $B$, primarily coupled to quarks, as a constituent of the proton. This is achieved by allowing for a dark photon parton distribution function (PDF) in the PDF evolution equations. [...]
arXiv:2203.12628; CERN-TH-2022-043.- 2022-08-01 - 32 p. - Published in : JHEP 2208 (2022) 019 Fulltext: document - PDF; 2203.12628 - PDF;

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