Probing new physics scenarios of muon g − 2 via J/ψ decay at BESIII

Cvetič, Gorazd; Kim, C. S.; Lee, Donghun; Sahoo, Dibyakrupa

doi:10.1007/jhep10(2020)207

Cited by 7 publications

(13 citation statements)

References 32 publications

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“…It is important to note that our paper differs significantly from Ref. [18] by the facts that (1) we consider all the four spin-parity possibilities of X as well as the possibility of X not being a parity eigenstate, instead of only scalar and vector cases as in [18], (2) we show that for the case of X being not a parity eigenstate the parameter space allowed by muon g−2 is widened enhancing the branching ratios for the decay J/ψ → µ − µ + X making their experimental observation more feasible, and (3) we provide a completely different methodology to ascertain the various spin-parity possibilities of X using the difference in distribution patterns in conventional Dalitz plot, angular distribution, square Dalitz plot as well as by using two experimentally accessible dimensionless ratios.…”

Section: Introductioncontrasting

confidence: 68%

“…Considering the X boson to be a parity eigenstate, it was shown in Ref. [18] that this decay can be studied at BES III. As noted in the previous section, from Fig.…”

Section: Study Of the Decaymentioning

confidence: 99%

“…Therefore, purely from the point of view of muon anomalous magnetic moment one usually considers only the scalar and vector new physics scenarios. In a recent work of one of the authors [18] it was explored how the decay J/ψ → µ − µ + X can indeed be used to probe this sort of new physics in a conclusive and independent manner at the BES III experiment. This decay mode can be compared to the analogous process e + e − → µ − µ + X proposed in context of Belle II [19] which has a large number of competing background processes that must be carefully considered.…”

Section: Introductionmentioning

confidence: 99%

“…( 2) above) leaving no track in the detector. As explained in detail in [18] the most dominant SM background for the decay J/ψ → µ − µ + X arises from final state radiation which can be readily handled experimentally by employing a cut on the missing energy distribution. The feasibility of observing the decay process is exemplified by the fact that around 30 to 300 events for the scalar case and about 300 to 2000 events for the vector case are expected at BES III after the aforementioned missing energy cut is applied [18].…”

Section: Introductionmentioning

confidence: 99%

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Methodology to determine the spin-parity of muon-philic $X$ boson in $J/ψ\rightarrow μ^- μ^+ X$ decay

Mitra,

Sahoo

2021

Preprint

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The present anomaly in muon anaomalous magnetic moment can be explained by the presence of a muonphilic X boson which could be a scalar particle or a vector particle with mass less than twice the mass of muon. The muon-philic X boson could interestingly not be a parity eigenstate as well. If there exists such a boson, irrespective of its parity, it can be directly observed in the decay J/ψ → µ − µ + X where X remains invisible. We show that by using the angular distribution or the distribution of events in the square Dalitz plot, along with two well defined dimensionless ratios, one can clearly distinguish among the various spin-parity possibilities. This would constitute an important probe of both the existence and the nature of this new physics possibility.

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Section: Introductioncontrasting

confidence: 68%

“…Considering the X boson to be a parity eigenstate, it was shown in Ref. [18] that this decay can be studied at BES III. As noted in the previous section, from Fig.…”

Section: Study Of the Decaymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Methodology to determine the spin-parity of muon-philic $X$ boson in $J/ψ\rightarrow μ^- μ^+ X$ decay

Mitra,

Sahoo

2021

Preprint

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“…This can for example be done by a missing momentum search in muon fixed target experiments like M 3 [47] or NA64μ [48,49], where the muon-philic vector is produced via Bremsstrahlung in muon-nucleus collisions. Additionally, it can also be looked for in the low-energy e + e − collider experiment BESIII [50]. If on the contrary the new boson is heavy, M X > 2m μ one could directly search for it in the visible decay into a pair of muons at NA64μ [49] as well as at M 3 [47].…”

Section: P1mentioning

confidence: 99%

Confirming $$U(1)_{L_\mu -L_{\tau }}$$ as a solution for $$(g-2)_\mu $$ with neutrinos

et al. 2021

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The recent measurement of the muon anomalous magnetic moment by the Fermilab E989 experiment, when combined with the previous result at BNL, has confirmed the tension with the SM prediction at $$4.2\,\sigma $$ 4.2 σ CL, strengthening the motivation for new physics in the leptonic sector. Among the different particle physics models that could account for such an excess, a gauged $$U(1)_{L_\mu -L_{\tau }}$$ U ( 1 ) L μ - L τ stands out for its simplicity. In this article, we explore how the combination of data from different future probes can help identify the nature of the new physics behind the muon anomalous magnetic moment. In particular, we contrast $$U(1)_{L_\mu -L_{\tau }}$$ U ( 1 ) L μ - L τ with an effective $$U(1)_{L_\mu }$$ U ( 1 ) L μ -type model. We first show that muon fixed target experiments (such as NA64$$\mu $$ μ ) will be able to measure the coupling of the hidden photon to the muon sector in the region compatible with $$(g-2)_\mu $$ ( g - 2 ) μ , and will have some sensitivity to the hidden photon’s mass. We then study how experiments looking for coherent elastic neutrino-nucleus scattering (CE$$\nu $$ ν NS) at spallation sources will provide crucial additional information on the kinetic mixing of the hidden photon. When combined with NA64$$\mu $$ μ results, the exclusion limits (or reconstructed regions) of future CE$$\nu $$ ν NS detectors will also allow for a better measurement of the mediator mass. Finally, the observation of nuclear recoils from solar neutrinos in dark matter direct detection experiments will provide unique information about the coupling of the hidden photon to the tau sector. The signal expected for $$U(1)_{L_\mu -L_{\tau }}$$ U ( 1 ) L μ - L τ is larger than for $$U(1)_{L_\mu }$$ U ( 1 ) L μ with the same kinetic mixing, and future multi-ton liquid xenon proposals (such as DARWIN) have the potential to confirm the former over the latter. We determine the necessary exposure and energy threshold for a potential $$5\,\sigma $$ 5 σ discovery of a $$U(1)_{L_\mu -L_{\tau }}$$ U ( 1 ) L μ - L τ boson, and we conclude that the future DARWIN observatory will be able to carry out this measurement if the experimental threshold is lowered to $$1\,{\mathrm {keV}}_{\mathrm {nr}} $$ 1 keV nr .

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Lattice-motivated QCD coupling and hadronic contribution to muon g − 2

Cvetič

Kögerler

2021

J. Phys. G: Nucl. Part. Phys.

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We present an updated version of a QCD coupling which fulfills various physically motivated conditions: at high momenta it practically coincides with the perturbative QCD coupling; at intermediate momenta it reproduces correctly the physics of the semihadronic tau decay; and at very low momenta it is suppressed as suggested by large-volume lattice calculations. An earlier presented analysis is updated here in the sense that the Adler function, in the regime |Q 2|≲ 1 GeV2, is evaluated by a renormalon-motivated resummation method. This Adler function is then used here in the evaluation of the quantities related with the semihadronic (strangeless) τ-decay spectral functions, including Borel–Laplace sum rules in the (V + A)-channel. The analysis is then extended to the evaluation of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment, a μ had ( 1 ) , where we include in the Adler function the V-channel higher-twist OPE terms which are regulated in the infrared (IR) by mass parameters which are expected to be ≲1 GeV. The correct value of a μ had ( 1 ) can be reproduced with the mentioned IR-regulating mass parameters if the value of the condensate ⟨ O 4 ⟩ V + A is positive (and thus the gluon condensate value is positive). This restriction and the requirement of the acceptable quality of the fits to the various mentioned sum rules then lead us to the restriction

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Probing new physics scenarios of muon g − 2 via J/ψ decay at BESIII

Cited by 7 publications

References 32 publications

Methodology to determine the spin-parity of muon-philic $X$ boson in $J/ψ\rightarrow μ^- μ^+ X$ decay

Methodology to determine the spin-parity of muon-philic $X$ boson in $J/ψ\rightarrow μ^- μ^+ X$ decay

Confirming $$U(1)_{L_\mu -L_{\tau }}$$ as a solution for $$(g-2)_\mu $$ with neutrinos

Lattice-motivated QCD coupling and hadronic contribution to muon g − 2

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