High-energy behavior of baryon- and lepton-number violating scattering amplitudes in the standard model

Espinosa, Olivier

doi:10.1016/0550-3213(90)90473-q

Cited by 264 publications

(142 citation statements)

References 8 publications

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“…5 Since the dominant processes are induced by uu and ud collisions: the final states should contain a singleū/d antiquark, one antilepton from each generation, threec/s antiquarks and threet/b antiquarks, for a total of 10 final state particles. The initial and final states are constrained so that the total electric charge is conserved.…”

Section: Simulations Of Sphaleron-induced Processesmentioning

confidence: 99%

“…The second example was provided by sphalerons [2,3], which are classical solutions of the electroweak field equations that interpolate between vacua with different values of the Chern-Simons number, providing a potential barrier E Sph to ∆B = 3 transitions that is expected to be 9 TeV. It has been thought that experimental observation of sphaleron-induced transitions would also be unobservable at the LHC [4][5][6][7][8][9][10][11], because ∆n = ±1 transitions would be suppressed by exp(O(−4π/α W )). 1 However, this longstanding consensus has been challenged in a bold recent paper [14] by S.-H. Henry Tye and Sam S. C. Wong (TW), who argue that sphaleron-induced transition rates could be much larger than had been estimated previously.…”

Section: Introductionmentioning

confidence: 99%

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Search for sphalerons in proton-proton collisions

Ellis

Sakurai

2016

J. High Energ. Phys.

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In a recent paper, Tye and Wong (TW) have argued that sphaleron-induced transitions in high-energy proton-proton collisions should be enhanced compared to previous calculations, based on a construction of a Bloch wave function in the periodic sphaleron potential and the corresponding pass band structure. Here we convolute the calculations of TW with parton distribution functions and simulations of final states to explore the signatures of sphaleron transitions at the LHC and possible future colliders. We calculate the increase of sphaleron transition rates in proton-proton collisions at centre-of-mass energies of 13/14/33/100 TeV for different sphaleron barrier heights, while recognising that the rates have large overall uncertainties. We use a simulation to show that LHC searches for microscopic black holes should have good efficiency for detecting sphaleron-induced final states, and discuss their experimental signatures and observability in Run 2 of the LHC and beyond. We recast the early ATLAS Run-2 search for microscopic black holes to constrain the rate of sphaleron transitions at 13 TeV, deriving a significant limit on the sphaleron transition rate for the nominal sphaleron barrier height of 9 TeV.

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Section: Simulations Of Sphaleron-induced Processesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Search for sphalerons in proton-proton collisions

Ellis

Sakurai

2016

J. High Energ. Phys.

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“…Although these processes occur with exponentially small rates [14][15][16][17][18][19][20][21][22][23][24][25] in weakly interacting theories, they may be important for baryogenesis [8,26,27], stability of the Higgs vacuum [28][29][30][31][32][33][34][35], or violation of the baryon and lepton numbers at future colliders [36][37][38][39]. We consider nonperturbative transitions of a new type: classically forbidden creation of topological soliton-antisoliton pairs in N -particle collisions, see the sketch of the N = 2 process in figures 1a,b.…”

Section: Introductionmentioning

confidence: 99%

Semiclassical description of soliton-antisoliton pair production in particle collisions

Demidov

Levkov

2015

J. High Energ. Phys.

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We develop a consistent semiclassical method to calculate the probability of topological soliton-antisoliton pair production in collisions of elementary particles. In our method one adds an auxiliary external field pulling the soliton and antisoliton in the opposite directions. This transforms the original scattering process into a Schwinger pair creation of the solitons induced by the particle collision. One describes the Schwinger process semiclassically and recovers the original scattering probability in the limit of vanishing external field. We illustrate the method in (1 + 1)-dimensional scalar field model where the suppression exponents of soliton-antisoliton production in the multiparticle and two-particle collisions are computed numerically.

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“…This, of course, is a more general problem that also affects calculations of electroweak baryon number violation in high energy pp collisions [45,46] and QCD multi-particle production in hadronic collisions [47]. …”

Section: Discussionmentioning

confidence: 99%

Instanton contribution to scalar charmonium and glueball decays

Zetocha

Schäfer

2003

Phys. Rev. D

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We study instanton contributions to hadronic decays of the scalar glueball, the pseudoscalar charmonium state η c , and the scalar charmonium state χ c . Hadronic decays of the η c are of particular interest. The three main decay channels are KKπ, ηππ and η ′ ππ, each with an unusually large branching ratio ∼ 5%. On the quark level, all three decays correspond to an instanton type vertex (cc)(ss)(dd)(ūu). We show that the total decay rate into three pseudoscalar mesons can be reproduced using an instanton size distribution consistent with phenomenology and lattice results. Instantons correctly reproduce the ratio B(ππη)/B(ππη ′ ) but over-predict the ratio B(KKπ)/B(ππη(η ′ )). We consider the role of scalar resonances and suggest that the decay mechanism can be studied by measuring the angular distribution of decay products.

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High-energy behavior of baryon- and lepton-number violating scattering amplitudes in the standard model

Cited by 264 publications

References 8 publications

Search for sphalerons in proton-proton collisions

Search for sphalerons in proton-proton collisions

Semiclassical description of soliton-antisoliton pair production in particle collisions

Instanton contribution to scalar charmonium and glueball decays

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