Namikawa, Toshiya Guan, Yilun Darwish, Omar Sherwin, Blake D. Aiola, Simone Battaglia, Nicholas Beall, James A. Becker, Daniel T. Bond, J. Richard Calabrese, Erminia
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We present new constraints on anisotropic birefringence of the cosmic microwave background polarization using two seasons of data from the Atacama Cosmology Telescope covering $456$ square degrees of sky. The birefringence power spectrum, measured using a curved-sky quadratic estimator, is consistent with zero. Our results provide the tightest curr...

Budker, Dmitry López-Urrutia, José R. Crespo Derevianko, Andrei Flambaum, Victor V. Krasny, Mieczyslaw Witold Petrenko, Alexey Pustelny, Szymon Surzhykov, Andrey Yerokhin, Vladimir A. Zolotorev, Max
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The Gamma Factory initiative proposes to develop novel research tools at CERN by producing, accelerating and storing highly relativistic, partially stripped ion beams in the SPS and LHC storage rings. By exciting the electronic degrees of freedom of the stored ions with lasers, high-energy narrow-band photon beams will be produced by properly colli...

Cotogno, Sabrina Kasemets, Tomas Myska, Miroslav

The future runs of LHC offer a unique opportunity to measure correlations between two partons inside the proton, which have never been experimentally detected. The process of interest is the production of two positively charged W-bosons decaying in the muon channel. We present a detailed analysis of proton-proton collisions at $\sqrt{s}$ = 13 TeV, ...

Chishtie, F.A. Huang, Zhuo-Ran Reimer, M. Steele, T.G. Wang, Zhi-Wei

The Coleman-Weinberg (CW) renormalization scheme for the effective potential is particularly valuable for CW symmetry-breaking mechanisms, which in general more easily lead to the strong first-order phase transition necessary for stochastic gravitational wave signals. A full understanding of the CW-MS scheme transformation thus becomes important in...

Algueró, Marcel Descotes-Genon, Sébastien Matias, Joaquim Novoa Brunet, Martín

We apply the formalism of amplitude symmetries to the angular distribution of the decays $B \to D^* \ell \nu$ for $\ell=e,\mu,\tau$. We show that the angular observables used to describe the distribution of this class of decays are not independent in absence of New Physics contributing to tensor operators. We derive sets of relations among the angu...

Arleo, François Peigné, Stéphane

We single out the role of fully coherent induced gluon radiation on light hadron production in pA collisions. The effect has an interesting color structure, as the induced radiation depends on the global color charge of the partonic subprocess final state. Baseline predictions for light hadron nuclear suppression in pPb collisions at the LHC are pr...

Brax, Philippe Heisenberg, Lavinia Kuntz, Adrien

We consider the prospect of detecting cubic Galileons through their imprint on gravitational wave signals from a triple system. Namely, we consider a massive Black Hole (BH) surrounded by a binary system of two smaller BHs. We assume that the three BHs acquire a conformal coupling to the scalar field whose origin could be due to cosmology or to the...

Abreu, S. Febres Cordero, F. Ita, H. Jaquier, M. Page, B. Ruf, M.S. Sotnikov, V.

We present the analytic form of the two-loop four-graviton scattering amplitudes in Einstein gravity. To remove ultraviolet divergences we include counterterms quadratic and cubic in the Riemann curvature tensor. The two-loop numerical unitarity approach is used to deal with the challenging momentum dependence of the interactions. We exploit the al...

Ablikim, M. Achasov, M.N. Adlarson, P. Ahmed, S. Albrecht, M. Alekseev, M. Amoroso, A. An, F.F. An, Q. Bai, Y.
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There has recently been a dramatic renewal of interest in the subjects of hadron spectroscopy and charm physics. This renaissance has been driven in part by the discovery of a plethora of charmonium-like $XYZ$ states at BESIII and $B$ factories, and the observation of an intriguing proton-antiproton threshold enhancement and the possibly related $X...

Dasgupta, Mrinal Dreyer, Frédéric A. Hamilton, Keith Monni, Pier Francesco Salam, Gavin P. Soyez, Gregory

Parton showers are among the most widely used tools in collider physics. Despite their key importance, none so far has been able to demonstrate accuracy beyond a basic level known as leading logarithmic (LL) order, with ensuing limitations across a broad spectrum of physics applications. In this letter, we propose criteria for showers to be conside...