Baryon number violating scatterings in laboratories

Tye, Henry; Wong, Sung Ching Sam

doi:10.1103/physrevd.96.093004

Cited by 24 publications

(31 citation statements)

References 41 publications

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“…In the top two plots, one can see that HL-LHC13 can probe values of p sph up to ∼ 10 −4 for E thr ∼ 9 TeV. It is interesting to note that recent studies estimated the threshold energy to lie around this scale [14,15]. The high-luminosity LHC will therefore provide a meaningful constraint on this type of estimation.…”

Section: )mentioning

confidence: 93%

On the phenomenology of sphaleron-induced processes at the LHC and beyond

Papaefstathiou

Plätzer

Sakurai

2019

J. High Energ. Phys.

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We investigate the phenomenological aspects of non-perturbative baryon-and lepton-number-violating processes at hadron colliders. Such processes, induced by instanton/sphaleron configurations of the electroweak gauge fields, are believed to play a crucial role in the generation of baryon asymmetry in the early Universe at finite temperature. On the other hand, at colliders (that represent the zero-temperature high-energy regime) the rate and observability of such processes are still under debate. Motivated by current theoretical considerations, we construct a modern event generator within the general-purpose Herwig Monte Carlo framework, that aims to capture the most relevant features of the dominant processes. We perform a detailed phenomenological analysis focussing on the Large Hadron Collider, at 13 TeV proton-proton centre-of-mass energy, a potential highenergy upgrade at 27 TeV and the proposed Future Circular Collider (FCC-hh) at 100 TeV. We derive constraints on the expected rates for various parametrisations of our model. We find that all three colliders are capable of providing meaningful information on the nature of instanton/sphaleron-induced processes at various energy scales.

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Section: )mentioning

confidence: 93%

On the phenomenology of sphaleron-induced processes at the LHC and beyond

Papaefstathiou

Plätzer

Sakurai

2019

J. High Energ. Phys.

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“…[19]) as input γ when calculating the decay parameters β i with Eq. (20). We use the modified potential in Eq.…”

Section: Sphaleron Potentialmentioning

confidence: 99%

“…At proton-proton energy E pp = 14 TeV, the parton distribution suppression is ∼ 10 −6 . Together with the phase-space suppression [20]], this leads to an overall suppression of ∼ 10 −10 . A crude estimate suggests that there may be 10 3 observable (B + L)-violating events during the HE-LHC run.…”

Section: Introductionmentioning

confidence: 99%

“…Although it is well known that baryon-numberviolating processes happen in EW theory [1][2][3][4], there is a large (∼ 70 orders of magnitude) discrepancy in the determinations of the baryon-number-violating scattering cross sections at E ∼ E sph [8][9][10][11][12][13][14][15][16][17][18][19][20], separating the observable from the totally unobservable predictions in the * yqiuai@connect.ust.hk † iastye@ust.hk, sht5@cornell.edu laboratory. Early estimates showed that the (B + L)violating scattering cross section in the laboratory goes like (2) where E 0 = √ 6πm W /α W 18.5 TeV and F (E = 0) = 1.…”

Section: Introductionmentioning

confidence: 99%

“…Reference [20] briefly compared these two very different estimates of the (B+L)-violating scattering cross section. Here, we shall provide some background and clarifying discussions on the Bloch-wave analysis [19].…”

Section: Introductionmentioning

confidence: 99%

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Role of Bloch waves in baryon-number violating processes

Qiu

Tye

2019

Phys. Rev. D

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In the Bloch-wave approach to estimate the baryon-number-violating scattering cross section in the standard electroweak theory in the laboratory, we clarify the relation between the single sphaleron barrier and multiple (near periodic) sphaleron barrier cases. We explain how a realistic consideration modifies/corrects the idealized Bloch wave and the resonant tunneling approximation. The basic approach is in part analogous to the well-known triple-α process to form carbon in nucleosynthesis.

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B+L violation at colliders and new physics

Cerdeño

Reimitz²,

Sakurai

et al. 2018

J. High Energ. Phys.

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Chiral electroweak anomalies predict baryon (B) and lepton (L) violating fermion interactions, which can be dressed with large numbers of Higgs and gauge bosons. The estimation of the total B + L-violating rate from an initial two-particle state -potentially observable at colliders-has been the subject of an intense discussion, mainly centered on the resummation of boson emission, which is believed to contribute to the crosssection with an exponential function of the energy, yet with an exponent (the "holy-grail" function) which is not fully known in the energy range of interest. In this article we focus instead on the effect of fermions beyond the Standard-Model (SM) in the polynomial contributions to the rate. It is shown that B + L processes involving the new fermions have a polynomial contribution that can be several orders of magnitude greater than in the SM, for high centre-of-mass energies and light enough masses. We also present calculations that hint at a simple dependence of the holy grail function on the heavy fermion masses. Thus, if anomalous B + L violating interactions are ever detected at high-energy colliders, they could be associated with new physics.

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Baryon number violating scatterings in laboratories

Cited by 24 publications

References 41 publications

On the phenomenology of sphaleron-induced processes at the LHC and beyond

On the phenomenology of sphaleron-induced processes at the LHC and beyond

Role of Bloch waves in baryon-number violating processes

B+L violation at colliders and new physics

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