Riccardo Rattazzi

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Related publications (48)

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Central charge bounds in 4D conformal field theory

Riccardo Rattazzi, Alessandro Vichi

We derive model-independent lower bounds on the stress tensor central charge C-T in terms of the operator content of a 4-dimensional conformal field theory. More precisely, C-T is bounded from below by a universal function of the dimensions of the lowest a ...

American Physical Society2011

A naturally light dilaton

Riccardo Rattazzi, Duccio Pappadopulo, Paolo Lodone, Lorenzo Vitale

Goldstone's theorem does not apply straightforwardly to the case of spontaneously broken scale invariance. We elucidate under what conditions a light scalar degree of freedom, identifiable with the dilaton, can naturally arise. Our construction can be cons ...

Springer Nature2013

Superadditivity at large charge

Riccardo Rattazzi, Ipak Fadakar, Timothy Cohen, Andrew Wesley Gomes

The weak gravity conjecture has been invoked to conjecture that the dimensions of charged operators in a CFT should obey a superadditivity relation (sometimes referred to as convexity). In this paper, we study superadditivity of the operator spectrum in th ...

Springer2025

Implications of LHCb measurements and future prospects

Riccardo Rattazzi

During 2011 the LHCb experiment at CERN collected 1.0 fb(-1) of root s = 7 TeV pp collisions. Due to the large heavy quark production cross-sections, these data provide unprecedented samples of heavy flavoured hadrons. The first results from LHCb have made ...

Springer2013

Probing the scattering of equivalent electroweak bosons

Riccardo Rattazzi, Andrea Wulzer, Roberto Franceschini

We analyze the kinematic conditions under which the scattering of equivalent massive spin-1 vector bosons factorizes out of the complete process. In practice, we derive the conditions for the validity of the effective W approximation, proposed long ago but ...

Springer Nature2012

Towards a muon collider (vol 83, 864, 2023)

Riccardo Rattazzi, Xavier Buffat, Andrea Wulzer, Roberto Franceschini, Varun Sharma, Alexej Grudiev, Riccardo Torre, Siyu Chen, Alfredo Glioti, Xiaoran Zhao, Lorenzo Ricci, Brian Quinn Henning, Filippo Nardi

Springer2024

Gaugino mass in AdS space

Riccardo Rattazzi, Claudio Scrucca

We study supersymmetric QED in AdS(4) with massless matter. At 1-loop the ultra-violet regulator of the theory generates a contribution to the gaugino mass that is naively inconsistent with unbroken supersymmetry. We show that this effect, known in flat sp ...

Springer Nature2009

energy's and amplitudes' positivity (vol 05, 095, 2010)

Riccardo Rattazzi

We correct typos in eq. (2.41) and (2.42) of ref. [1]. This has several repercussions for the equations of section 2.3, but none for the subsequent sections or for the conclusions of the paper ...

Springer Nature2011