Direct Searches for New Physics Particles at<i>BABAR</i>

Eigen, G.

doi:10.1088/1742-6596/631/1/012034

Cited by 5 publications

(7 citation statements)

References 59 publications

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“…[15]). This "heavy" photon may be detectable in low energy experiments (see, e.g., Refs [16][17][18][19]). It is also worth pointing out that the Stueckelberg procedure is not limited to vector fields.…”

Section: Introductionmentioning

confidence: 99%

Stueckelberg massive electromagnetism in curved spacetime: Hadamard renormalization of the stress-energy tensor and the Casimir effect

Belokogne

Folacci

2016

Phys. Rev. D

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We discuss Stueckelberg massive electromagnetism on an arbitrary four-dimensional curved spacetime (gauge invariance of the classical theory and covariant quantization; wave equations for the massive spin-1 field Aµ, for the auxiliary Stueckelberg scalar field Φ and for the ghost fields C and C * ; Ward identities; Hadamard representation of the various Feynman propagators and covariant Taylor series expansions of the corresponding coefficients). This permits us to construct, for a Hadamard quantum state, the expectation value of the renormalized stress-energy tensor associated with the Stueckelberg theory. We provide two alternative but equivalent expressions for this result. The first one is obtained by removing the contribution of the "Stueckelberg ghost" Φ and only involves state-dependent and geometrical quantities associated with the massive vector field Aµ. The other one involves contributions coming from both the massive vector field and the auxiliary Stueckelberg scalar field, and it has been constructed in such a way that, in the zero-mass limit, the massive vector field contribution reduces smoothly to the result obtained from Maxwell's theory. As an application of our results, we consider the Casimir effect outside a perfectly conducting medium with a plane boundary. We discuss the results obtained using Stueckelberg but also de BroglieProca electromagnetism and we consider the zero-mass limit of the vacuum energy in both theories. We finally compare the de Broglie-Proca and Stueckelberg formalisms and highlight the advantages of the Stueckelberg point of view, even if, in our opinion, the de Broglie-Proca and Stueckelberg approaches of massive electromagnetism are two faces of the same field theory.

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Section: Introductionmentioning

confidence: 99%

Stueckelberg massive electromagnetism in curved spacetime: Hadamard renormalization of the stress-energy tensor and the Casimir effect

Belokogne

Folacci

2016

Phys. Rev. D

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“…Some recent summaries of existing results can be found in Ref. [55][56][57]. For a more detailed review, we refer readers to Ref.…”

Section: Constraints On Light Dark Sectormentioning

confidence: 99%

Light dark sector searches at low-energy high-luminosity e + e − colliders

Yin

Zhu

2016

Front. Phys.

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Although the standard model (SM) is extremely successful, there are various motivations for considering the physics beyond the SM. For example, the SM includes neither dark energy nor dark matter, which has been confirmed through astrophysical observations. Examination of the dark sector, which contains new, light, weakly-coupled particles at the GeV scale or lower, is well motivated by both theory and dark-matter detection experiments. In this mini-review, we focus on one particular case in which these new particles can interact with SM particles through a kinematic mixing term between U (1) gauge bosons. The magnitude of the mixing can be parameterized by a parameter . Following a brief overview of the relevant motivations and the constraints determined from numerous experiments, we focus on the light dark sector phenomenology at low-energy high-luminosity e + e − colliders. These colliders are ideal for probing the new light particles, because of their large production rates and capacity for precise resonance reconstruction. Depending on the details of a given model, the typical observed signatures may also contain multi lepton pairs, displaced vertices, and/or missing energy. Through the use of extremely large data samples from existing experiments, such as KLOE, CLEO, BABAR, Belle, and BESIII, the < 10 −4 -10 −3 constraint can be obtained. Obviously, future experiments with larger datasets will provide opportunities for the discovery of new particles in the dark sector, or for stricter upper limits on . Once the light dark sector is confirmed, the particle physics landscape will be changed significantly.Keywords dark photon, electron-positron collider, dark matter PACS numbers 13.66.Hk, 95.35.+d

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“…As our Z is massive, one might think that the invariant masses of various opposite-sign muons m µ + µ − is an effective way to distinguish signal from background. 4 For > 0.05, this is true, however for smaller coupling the signal gets washed out by combinatorics. The problem is that finding the 'right' muons -the pair that reconstruct the Z mass -becomes challenging as gets smaller.…”

Section: Introductionmentioning

confidence: 98%

“…Light Z that couple to electrons have been severely constrained. For M Z < 10 GeV, BaBar has been able to limit a new gauge boson coupling to electron at level of O(10 −3 ) [4][5][6], and the projected exclusion reach from Belle II is an order of magnitude stronger [7,8]. Due to these strong low-energy constraints, we will focus here on the lepton number combination that does not involve electrons, L µ − L τ .…”

Section: Introductionmentioning

confidence: 99%

Constraints onLμ−Lτinteractions at the LHC and beyond

Elahi

Martin

2016

Phys. Rev. D

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In this paper we examine the constraints dedicated LHC multi lepton searches can place on Z bosons coming from gauged muon number minus tau number, L µ − L τ. As the L µ − L τ gauge boson does not couple to proton constituents or electrons at tree level, the current bounds are fairly loose, especially for M Z 1 GeV. For 2m µ < M Z < M Z /2 we develop search strategies using the pp → Z → 4 µ channel. The cleanliness of the final state, combined with the fact that pp → Z → 4e, Z → 2e 2µ can be used as background control samples, allow us to spot L µ − L τ Z with couplings O(10 −3) times the Standard Model couplings. For lighter Z , we propose the mode pp → 2µ + / E T. The presence of missing energy means there is a wider set of backgrounds to consider in this final state, such as Drell-Yan production of leptonically decaying τ pairs, however we find these can be controlled with careful cuts. Combining the 4 µ and 2 µ + / E T modes, we find that with ∼ 3 ab −1 of integrated luminosity we are sensitive to couplings g Z 0.005 g 1 and 0.5 GeV ≤ M Z ≤ 40 GeV and g Z 0.001 g 1 for M Z < 2 m µ. This region includes the parameter space where L µ − L τ models can ameliorate the muon g − 2 anomaly. We repeat these analyses at a future e + e − Z-factory, where we find improved sensitivity. Specifically, given 2.6 ab −1 of luminosity, we can exclude g Z 0.001 g 1 for 2 m µ ≤ M Z ≤ M Z /2.

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Direct Searches for New Physics Particles atBABAR

Cited by 5 publications

References 59 publications

Stueckelberg massive electromagnetism in curved spacetime: Hadamard renormalization of the stress-energy tensor and the Casimir effect

Stueckelberg massive electromagnetism in curved spacetime: Hadamard renormalization of the stress-energy tensor and the Casimir effect

Light dark sector searches at low-energy high-luminosity e + e − colliders

Constraints onLμ−Lτinteractions at the LHC and beyond

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