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Wilson Coefficients and Natural Zeros from the On-Shell Viewpoint
/ Delle Rose, Luigi (Barcelona, IFAE ; BIST, Barcelona) ; von Harling, Benedict (Barcelona, IFAE ; BIST, Barcelona) ; Pomarol, Alex (Barcelona, IFAE ; BIST, Barcelona ; Barcelona, Autonoma U. ; CERN)
We show how to simplify the calculation of the finite contributions from heavy particles to EFT Wilson coefficients by using on-shell methods. We apply the technique to the one-loop calculation of $g-2$ and $H\gamma\gamma$, showing how finite contributions can be obtained from the product of tree-level amplitudes. [...]
arXiv:2201.10572.-
2022-05-18 - 19 p.
- Published in : JHEP 2205 (2022) 120
Fulltext: Publication - PDF; 2201.10572 - PDF;
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2.
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Cornering Large-$N_c$ QCD with Positivity Bounds
/ Fernandez, Clara (Barcelona, IFAE ; BIST, Barcelona) ; Pomarol, Alex (Barcelona, IFAE ; BIST, Barcelona ; Barcelona, Autonoma U. ; CERN) ; Riva, Francesco (Geneva U., Dept. Theor. Phys.) ; Sciotti, Francesco (Barcelona, IFAE ; BIST, Barcelona)
The simple analytic structure of meson scattering amplitudes in the large-$N_c$ limit, combined with positivity of the spectral density, provides precise predictions on low-energy observables. Building upon previous studies, we explore the allowed regions of chiral Lagrangian parameters and meson couplings to pions. [...]
arXiv:2211.12488.-
2023-06-16 - 39 p.
- Published in : JHEP 2306 (2023) 094
Fulltext: 2211.12488 - PDF; document - PDF;
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3.
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A new $B$-flavour anomaly in $B_{d,s}\to K^{*0}\bar{K}^{*0}$: anatomy and interpretation
/ Algueró, Marcel (Barcelona, IFAE ; BIST, Barcelona ; Barcelona, Autonoma U.) ; Crivellin, Andreas (CERN ; Zurich U. ; PSI, Villigen) ; Descotes-Genon, Sébastien (IJCLab, Orsay) ; Matias, Joaquim (Barcelona, IFAE ; BIST, Barcelona ; Barcelona, Autonoma U.) ; Novoa-Brunet, Martín (IJCLab, Orsay)
In the context of the recently measured non-leptonic decays $B_{d}\to K^{*0}\bar{K}^{*0}$ and $B_{s}\to K^{*0}\bar{K}^{*0}$ we analyse the anatomy of the $L_{VV}$ observable that compares the longitudinal components of $B_s \to VV$ and $B_d \to VV$ decays. This observable is cleaner than the longitudinal polarisation fraction as it is afflicted only at subleading order in a $1/m_b$ expansion by the theoretical uncertainties arising in the transverse components entering the polarisation fraction. [...]
arXiv:2011.07867.-
2021-04-08 - 26 p.
- Published in : JHEP 2104 (2021) 066
Article from SCOAP3: PDF; Fulltext: PDF;
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4.
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Electroweak Precision Tests in High-Energy Diboson Processes
/ Franceschini, Roberto (Rome III U. ; INFN, Rome3) ; Panico, Giuliano (Barcelona, Autonoma U. ; Barcelona, IFAE) ; Pomarol, Alex (Barcelona, Autonoma U. ; Barcelona, IFAE) ; Riva, Francesco (CERN) ; Wulzer, Andrea (CERN ; ITPP, Lausanne ; Padua U. ; INFN, Padua)
A promising avenue to perform precision tests of the SM at the LHC is to measure differential cross-sections at high invariant mass, exploiting in this way the growth with the energy of the corrections induced by heavy new physics. We classify the leading growing-with-energy effects in longitudinal diboson and in associated Higgs production processes, showing that they can be encapsulated in four real "high-energy primary" parameters. [...]
arXiv:1712.01310; CERN-TH-2017-252; RM3-TH-17-1.-
2018-02-19 - 35 p.
- Published in : JHEP 02 (2018) 111
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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5.
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A note on the fate of the Landau–Yang theorem in non-Abelian gauge theories
/ Cacciari, Matteo (CERN ; Diderot U., Paris ; Paris, LPTHE ; UPMC, Paris (main)) ; Del Debbio, Luigi (CERN ; U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Espinosa, José R. (Barcelona, IFAE ; ICREA, Barcelona) ; Polosa, Antonio D. (INFN, Rome ; Rome U.) ; Testa, Massimo (INFN, Rome ; Rome U.)
Using elementary considerations of Lorentz invariance, Bose symmetry and BRST invariance, we argue why the decay of a massive color-octet vector state into a pair of on-shell massless gluons is possible in a non-Abelian SU(N) Yang-Mills theory, we constrain the form of the amplitude of the process and offer a simple understanding of these results in terms of effective-action operators..
arXiv:1509.07853; CERN-PH-TH-2015-173; CERN-PH-TH-2015-173.-
Geneva : CERN, 2016-02-10 - 6 p.
- Published in : Phys. Lett. B 753 (2016) 476-481
Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint
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7.
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Flavor hierarchies from dynamical scales
/ Panico, Giuliano (Barcelona, IFAE) ; Pomarol, Alex (Barcelona, IFAE ; CERN ; Barcelona, Autonoma U.)
One main obstacle for any beyond the SM (BSM) scenario solving the hierarchy problem is its potentially large contributions to electric dipole moments. An elegant way to avoid this problem is to have the light SM fermions couple to the BSM sector only through bilinears, $\bar ff$. [...]
arXiv:1603.06609; CERN-TH-2016-065; CERN-TH-2016-065.-
Geneva : CERN, 2016-07-20 - 25 p.
- Published in : JHEP 07 (2016) 097
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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8.
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Diboson Interference Resurrection
/ Panico, Giuliano (Barcelona, IFAE) ; Riva, Francesco (CERN) ; Wulzer, Andrea (CERN ; ITPP, Lausanne ; Padua U. ; INFN, Padua)
High-energy diboson processes at the LHC are potentially powerful indirect probes of heavy new physics, whose effects can be encapsulated in higher-dimensional operators or in modified Standard Model couplings. An obstruction however comes from the fact that leading new physics effects often emerge in diboson helicity amplitudes that are anomalously small in the Standard Model. [...]
arXiv:1708.07823; CERN-TH-2017-185.-
2018-01-10 - 8 p.
- Published in : Phys. Lett. B 776 (2018) 473-480
Article from SCOAP3: PDF; Fulltext: 1708.07823 - PDF; arXiv:1708.07823 - PDF;
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9.
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GMSB with Light Stops
/ Delgado, Antonio (Notre Dame U. ; CERN) ; Garcia-Pepin, Mateo (Barcelona, IFAE) ; Quiros, Mariano (ICREA, Barcelona ; Barcelona, IFAE)
Gauge mediated supersymmetry breaking (GMSB) is an elegant mechanism to transmit supersymmetry breaking from the hidden to the MSSM observable sector, which solves the supersymmetric flavor problem. However the smallness of the generated stop mixing requires superheavy stops to reproduce the experimental value of the Higgs mass. [...]
arXiv:1505.07469; CERN-PH-TH-2015-124; CERN-PH-TH-2015-124.-
Geneva : CERN, 2015-08-31 - 22 p.
- Published in : JHEP 08 (2015) 159
Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access article: PDF; External link: Preprint
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10.
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Topping-up multilepton plus b-jets anomalies at the LHC with a $Z'$ boson
/ Alvarez, Ezequiel (ICAS, UNSAM, Buenos Aires ; San Martin Natl. U. ; Buenos Aires, CONICET) ; Juste, Aurelio (Barcelona, IFAE ; ICREA, Barcelona) ; Szewc, Manuel (ICAS, UNSAM, Buenos Aires ; San Martin Natl. U. ; Buenos Aires, CONICET) ; Vazquez Schroeder, Tamara (CERN)
During the last years ATLAS and CMS have reported a number of slight to mild discrepancies in signatures of multileptons plus $b$-jets in analyses such as $t\bar t H$, $t\bar t W^\pm$, $t\bar t Z$ and $t\bar t t\bar t$. Among them, a recent ATLAS result on $t\bar t H$ production has also reported an excess in the charge asymmetry in the same-sign dilepton channel with two or more $b$-tagged jets. [...]
arXiv:2011.06514; ICAS 055/20.-
2021-05-14 - 34 p.
Article from SCOAP3: scoap3-fulltext - PDF; scoap - PDF; Fulltext: PDF;
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