HEP Phenomenology·hep-ph

Wed·Aug 24, 2022Wednesday·August 24, 2022

25 papers—18 primary·7 cross-listed·reconstructed*

01*
A new calculation of semi-exclusive axion-like particle production at the LHC
L. A. Harland-Lang🇬🇧 · M. Tasevsky🇨🇿
We present a new calculation of axion-like particle (ALP) production in the semi-exclusive photon-initiated (PI) channel, that is either with intact outgoing protons or rapidity gaps present in the final state, and with no colour flow between the colliding LHC protons. This is the first full treatment of this process, accounting for both the possibility of proton dissociation and the survival factor probability of no additional proton-proton interactions, including its kinematic and process dependence. We present the expected event yields in the case that either one or both protons are required to be registered in the forward proton detectors installed in association with ATLAS and CMS. We find that this process can be sensitive to currently unprobed regions of ALP mass and ALP-photon coupling, in particular in the intermediate mass region. Our calculation is provided in the publicly available SuperChic 4 Monte Carlo (MC) generator, and can be passed to a general purpose MC for showering and hadronization of the final state.
hep-phhep-exPRD(2023)·23 citations
02*
OPE-based Methods in Nonperturbative QCD
M. Shifman🇺🇸
I describe the inception and development of nonperturbative OPE-based methods in hadronic physics, such as the SVZ sum rules, inverse heavy quark mass expansion (IHQME) and so on and related topics.
hep-ph1 citation
03*
What can we learn from the electromagnetic properties of hidden-charm molecular pentaquarks with single strangeness?
Fu-Lai Wang🇨🇳 · Hong-Yan Zhou🇨🇳 · Zhan-Wei Liu🇨🇳 · Xiang Liu🇨🇳
Inspired by the observation of the $P_{cs} (4459)$ and $P_{ψ s}^{Λ} (4338)$ , we systematically investigate the magnetic moments, the transition magnetic moments, and the radiative decay behaviors of the $S$ -wave isoscalar $Ξ_{c}^{(')} D ˉ^{(*)}$ molecular pentaquark states in this work. Our quantitative investigation shows that their electromagnetic properties can provide important hint to decode the inner structure of these discussed isoscalar $Ξ_{c}^{(')} D ˉ^{*}$ molecular pentaquarks. As the potential research issue, we suggest future experiment to focus on the electromagnetic properties of these isoscalar $Ξ_{c}^{(')} D ˉ^{(*)}$ molecular pentaquarks, which are a typical hidden-charm molecular pentaquark system with single strangeness.
hep-phhep-exPRD(2022)·51 citations
04*
$P_{cc}^{N}$ states in a unitarized coupled-channel approach
Chao-Wei Shen🇩🇪 · Yong-hui Lin🇩🇪 · Ulf-G. Meißner🇩🇪
Starting from an effective Lagrangian with heavy quark spin symmetry embedded, the coupled-channel dynamics of the doubly charmed systems $D^{(*)} Σ_{c}^{(*)}$ is investigated. The potential underlying our investigation includes $t$ -channel pseudoscalar and vector meson exchanges. A series of $S$ -wave bound states with isospin $I = 1/2$ is found by applying the first iterated solution of the $N / D$ method: one state with binding energy $23$ MeV in the $5/ 2^{-}$ $D^{*} Σ_{c}^{*}$ channel, three states with binding energy $26$ , $30$ and $7$ MeV (relative to the thresholds from low to high, respectively) in the $3/ 2^{-}$ $D Σ_{c}^{*}$ - $D^{*} Σ_{c}$ - $D^{*} Σ_{c}^{*}$ system and three states with binding energy $32$ , $8$ and $16$ MeV in the $1/ 2^{-}$ $D Σ_{c}$ - $D^{*} Σ_{c}$ - $D^{*} Σ_{c}^{*}$ system. Those $P_{cc}^{N}$ states serve as the open-charm partners of the hidden charm pentaquarks $P_{ψ}^{N}$ observed by the LHCb Collaboration.
hep-phhep-exnucl-thEPJC(2023)·16 citations
05*
Probing CP violation in exclusive $b \to s ν ν ˉ$ transitions
Sébastien Descotes-Genon🇫🇷 · Svjetlana Fajfer🇸🇮 · Jernej F. Kamenik🇸🇮 · Martín Novoa-Brunet🇮🇹
We consider the time-dependent analysis of rare $B_{d}$ and $B_{s}$ decays mediated by $b \to s ν ν ˉ$ transitions. The inclusion of time evolution allows us to construct novel observables with specific sensitivity to CP-odd phases in these processes. The sensitivity to CP violation of corresponding time-integrated measurements in presence of flavor-tagging is also explored. We provide precise predictions for these observables in the SM and explore their sensitivity to new CP-violating NP contributions at present and planned future $B$ -physics experiments. As such, these observables provide unique probes of CP violation in $b \to s ν ν ˉ$ transitions.
hep-phhep-exPRD(2023)·12 citations
06*
Multiplicity, transverse momentum and pseudorapidity dependence of open-heavy flavored hadron production in proton+proton collisions at $s$ = 13 TeV using PYTHIA8
Bhagyarathi Sahoo🇮🇳 · Suman Deb🇮🇳 · Raghunath Sahoo🇮🇳
Recently, with the upgradation of LHC, it is realized that study of heavy-flavored hadrons, namely $Λ_{c}^{+}$ and $D^{0}$ in hadronic collisions, could reveal the possibility of thermalization of charm quarks. With this motivation, we study the production dynamics of these hadrons using a pQCD-inspired Monte Carlo event generator called PYTHIA8 in proton+proton collisions at $s$ = 13 TeV. The production dynamics of these hadrons are analyzed through charged-particle multiplicity, transverse momentum, and pseudorapidity. With the help of the established PYTHIA8 tunes to mimic the behavior of flow-like features, we investigated the variation of effective temperature and degree of non-extensivity using thermodynamically consistent non-extensive Tsallis statistics. We further attempted to establish a connection between the initial state and final state by estimating the correlation between the number of multi-partonic interactions ( $n_{MPI}$ ) with the Knudsen number.
hep-phhep-exhep-thnucl-ex+1IJMPE(2024)·5 citations
07*
Coupled Channel Effects for the Charmed-Strange Mesons
Wei Hao🇨🇳 · Yu Lu🇨🇳 · Bing-Song Zou🇨🇳
We make a systematic calculation of the spectra and hadronic decays of the $D_{s}$ system in a coupled channel framework, where the unquenched effects are induced by the $^{3} P_{0}$ model. In the calculation, the wave functions are obtained by using a nonrelativistic potential model and are handled precisely with Gaussian Expansion Method. Even though the fitting mainly focuses on the spectrum, our model agrees well with the experiments on both the spectra and the hadronic decays, suggesting that the coupled channel effect could result in a reasonable and coherent description of the $D_{s}$ mesons. Based on the calculation, we give a detailed analysis on various aspects of the excited states, especially $D_{s} (2317), D_{s} (2460), D_{s} (2536), D_{s} (2860), D_{s} (3040)$ . We also predict that $D_{s} (2^{3} P_{0})$ should be a $D^{*} K^{*}$ dominant molecule with mass $2894$ ~MeV, which is only $5$ ~MeV below the $D^{*} K^{*}$ threshold.
hep-phhep-exPRD(2022)·28 citations
08*
Obliquely Scrutinizing a Hidden SM-like Gauge Model
Van Que Tran🇨🇳 · Thong T. Q. Nguyen🇹🇼 · Tzu-Chiang Yuan🇹🇼
In view of the recent high precision measurement of the Standard Model $W$ boson mass at the CDF II detector, we compute the contributions to the oblique parameters $S$ , $T$ and $U$ coming from the two additional Higgs doublets (one inert and one hidden) as well as the hidden neutral dark gauge bosons and extra heavy fermions in the gauged two-Higgs-doublet model (G2HDM). While the effects from the hidden Higgs doublet and new heavy fermions are found to be minuscule, the hidden gauge sector $S U (2)_{H} \times U (1)_{X}$ with gauge coupling strength $≳ 1 0^{- 2}$ and gauge boson mass $≳ 100$ GeV can readily explain the $W$ boson mass anomaly but nevertheless excluded by the dilepton high-mass resonance searches at the Large Hadron Collider. On the other hand, the new global fits to the oblique parameters due to the new $W$ boson mass measurement can give discernible impacts on the mass splitting and mixing angle for the inert Higgs doublet in G2HDM. We also study the impact to the signal strength of diphoton mode of the 125 GeV Higgs boson $h \to γ γ$ and the detectability of the yet to observe process $h \to Z γ$ at the High Luminosity Large Hadron Collider. Current constraints for the dark matter candidate $W^{'}$ including the dark matter relic density, dark matter direct detections and invisible Higgs decays are also taken into account in this study.
hep-phEPJC(2023)·10 citations
09*
Numerical study of the Schwinger effect in axion inflation
Yann Cado🇪🇸 · Mariano Quirós🇪🇸
Previous studies demonstrate that the inflaton, when coupled to the hypercharge Chern-Simons density, can source an explosive production of helical hypermagnetic fields. Then, in the absence of fermion production, those fields have the capability of preheating the Universe after inflation and triggering a successful baryogenesis mechanism at the electroweak phase transition. In the presence of fermion production however, we expect a strong damping of the gauge fields production from the fermion backreaction, a phenomenon called Schwinger effect, thus jeopardizing their original capabilities. Using numerical methods we study the backreaction on the generated gauge fields and revisit the processes of gauge preheating and baryogenesis in the presence of the Schwinger effect. We have found that gauge preheating is very unlikely, while still having a sizable window in the parameter space to achieve the baryon asymmetry of the Universe at the electroweak phase transition.
hep-phPRD(2022)·20 citations
10*
Spectrum of $cc b ˉ b ˉ$ , $b c c ˉ c ˉ$ , and $b c b ˉ b ˉ$ Tetraquark States in the Dynamical Diquark Model
Halil Mutuk🇹🇷
The dynamical diquark model assumes that exotic hadrons can be formed from colored diquarks. This model asserts a multiquark exotic state composed of a compact diquark $δ$ and antidiquark $δ ˉ$ for a tetraquark interacting through a gluonic field of finite extent. Using Born-Oppenheimer (BO) approximation and BO potential calculated numerically on the lattice, we study mass spectra of $S -$ wave $cc b ˉ b ˉ$ , $b c c ˉ c ˉ$ , and $b c b ˉ b ˉ$ tetraquark systems in the basis of diquark spins. We assume that colour-antitriple diquark and colour-triplet antidiquark form tetraquark state. The predicted mass spectrum for ground state of $cc b ˉ b ˉ$ is found to be lower then their corresponding two-meson thresholds. This system may be a candidate for bound state. Masses of $b c c ˉ c ˉ$ and $b c b ˉ b ˉ$ tetraquark states are found to be above than the corresponding two-meson thresholds.
hep-phhep-exPLB(2022)·30 citations
11*
Collisional instabilities of neutrinos and their interplay with fast flavor conversion in compact objects
Lucas Johns🇺🇸 · Zewei Xiong🇩🇪
Fast and collisional flavor instabilities possibly occur in the neutrino decoupling regions of core-collapse supernovae and neutron-star mergers. To gain a better understanding of the relevant flavor dynamics, we numerically solve for the collisionally unstable evolution in a homogeneous, anisotropic model. In these calculations collisional instability is precipitated by unequal neutrino and antineutrino scattering rates. We compare the solutions obtained using neutral-current and charged-current interactions. We then study the nonlinear development of fast instabilities subjected to asymmetric scattering rates, finding evidence that the onset of collisional instability is hastened by fast oscillations. We also discuss connections to other recent works on collision-affected fast flavor conversion.
hep-phastro-ph.HEPRD(2022)·63 citations
12*
DIS coefficient functions at four loops in QCD and beyond
S. Moch🇩🇪 · B. Ruijl🇨🇭 · T. Ueda🇯🇵 · J.A.M. Vermaseren🇳🇱 · A. Vogt🇬🇧
We report results for the lowest even- $N$ moments of the flavor-nonsinglet structure functions $F_{2}$ and $F_{L}$ in QCD at the fourth order in the perturbative expansion in the strong coupling constant $α_{s}$ . Our results are presented in numerical form and we compare them with the leading and subleading terms of the threshold expansion for large values of $N$ , which corresponds to the limit $x \to 1$ .
hep-phPoS(2022)·5 citations
13*
Evaluation of the potential of a gamma-ray observatory to detect astrophysical neutrinos through inclined showers
Jaime Alvarez-Muñiz🇪🇸 · Ruben Conceição🇵🇹 · Pedro J. Costa🇵🇹 · Mário Pimenta🇵🇹 · Bernardo Tomé🇵🇹
We assess the capabilities of a ground-based gamma-ray observatory to detect astrophysical neutrinos with energies in the $100 TeV$ to $100 PeV$ range. The identification of these events would be done through the measurement of very inclined extensive air showers induced by downward-going and upward-going neutrinos. The discrimination of neutrino-induced showers in the overwhelming cosmic-ray background is achieved by analysing the balance of the total electromagnetic and muonic signals of the shower at the ground. We demonstrate that a $k m^{2}$ -scale wide field-of-view ground-based gamma-ray observatory could detect a couple of Very-High to Ultra-High energy (VHE-UHE) neutrino events per year with a reasonable pointing accuracy, making it an interesting facility for multi-messenger studies with both photons and neutrinos.
hep-phastro-ph.HEhep-exPRD(2022)·0 citations
14*
Estimates for rare three-body decays of the Omega baryon using chiral symmetry and the $Δ I = 1/2$ rule
Stefan Leupold (Uppsala U.)🇸🇪 · Cornelis J. G. Mommers (Uppsala U.)
We study rare three-body decays of the Omega baryon using SU(3) chiral perturbation theory, the successful effective field theory of quantum chromodynamics at low energies. At leading order, we calculate the branching fractions of the decay $Ω^{-} \to Ξ π π$ for all possible combinations of pions. For one channel we find an order-of-magnitude discrepancy between theory and experiment. This tension is known to exist in the non-relativistic limit, and we confirm that it remains in the relativistic calculation. Fairly independent of the values of the low-energy constants we establish lower limits for the branching fractions of these three-body Omega decays, which reaffirm the gap between theory and experiment. We point out that this discrepancy is closely tied to the $Δ I = 1/2$ selection rule. In turn, this means that the three-body decays constitute an interesting tool to scrutinize the selection rule. Using next-to-leading order calculations we also provide predictions for the decay $Ω^{-} \to Ξ^{0} μ^{-} ν ˉ_{μ}$ . We show that fully-differential distributions will provide access to low-energy constants needed in the axial-vector transitions from a decuplet to octet baryon. Since data for all of these rare three-body Omega decays are scarce (fully differential data are nonexistent), we recommend that they be remeasured at running and upcoming experiments, such as BESIII, LHCb, Belle-II, and PANDA.
hep-phPRD(2022)·8 citations
15*
Impact of $b \to c$ measurements on $Λ_{b} \to p τ ν ˉ$ decay in $U_{1}$ leptoquark model
Shabana Khan🇮🇳 · Neetu Raj Singh Chundawat🇮🇳 · Dinesh Kumar🇮🇳
The measurements of several lepton flavor universality (LFU) violating observables in the decays induced by the quark level transition $b \to c τ ν ˉ$ provide an inkling of plausible physics beyond the standard model of electroweak interactions. Such new physics would also impact other sectors. In this work, we estimate the leverage of new physics in $b \to c τ ν ˉ$ on $Λ_{b} \to p τ ν ˉ$ decay in the context of $U_{1}$ leptoquark model. In this model, the new physics couplings in $b \to uτ ν ˉ$ transition can be written in terms of $b \to c τ ν ˉ$ couplings and hence the extent of allowed new physics in $Λ_{b} \to p τ ν ˉ$ would be determined by $b \to c τ ν ˉ$ transition. Using the new physics parameter space obtained by performing a fit to all $b \to c τ ν ˉ$ data, we obtain predictions of several $Λ_{b} \to p τ ν ˉ$ observables. We find that the current $b \to c τ ν ˉ$ data allows an order of magnitude enhancement in the branching ratio as well as in the LFU ratio. The other observables such as convexity parameter, lepton forward-backward asymmetry, longitudinal polarization of final state baryon and tau lepton are consistent with the SM value.
hep-phNPB(2023)·4 citations
16*
Revisiting $Vh (\to b b ˉ)$ at the LHC and FCC-hh
Fady Bishara🇩🇪 · Philipp Englert🇩🇪 · Christophe Grojean🇩🇪 · Giuliano Panico🇮🇹 · Alejo N. Rossia🇬🇧
Diboson production processes provide good targets for precision measurements at present and future hadron colliders. We consider $V h$ production, focusing on the $h \to b b ˉ$ decay channel, whose sizeable cross section makes it accessible at the LHC. We perform an improved analysis by combining the 0-, 1- and 2-lepton channels with a scale-invariant $b$ -tagging algorithm that allows us to exploit events with either a boosted Higgs via mass-drop tagging or resolved $b$ -jets. This strategy gives sensitivity to 4 dimension-6 SMEFT operators that modify the $W$ and $Z$ couplings to quarks and is competitive with the bounds obtained from global fits. The benefit of the $h \to b b ˉ$ decay channel is the fact that it is the only $V h$ channel accessible at the LHC Run 3 and HL-LHC, while at FCC-hh it is competitive with the effectively background-free $h \to γ γ$ channel assuming $≲ 5$ % systematic uncertainty. Combining the boosted and resolved categories yields a 17% improvement on the most strongly bounded Wilson coefficient at the LHC Run 3 with respect to the boosted category alone (and a 7% improvement at FCC-hh). We also show that, at FCC-hh, a binning in the rapidity of the $V h$ system can significantly reduce correlations between some EFT operators. The bounds we obtain translate to a lower bound on the new physics scale of $5$ , $8$ , and $20$ TeV at the LHC Run 3, HL-LHC, and FCC-hh respectively, assuming new-physics couplings of order unity. Finally, we assess the impact of the $V h$ production channel on anomalous triple gauge coupling measurements, comparing with their determination at lepton colliders.
hep-phJHEP(2023)·20 citations
17*
A dress of flavour to suit any jet
Rhorry Gauld🇩🇪 · Alexander Huss🇨🇭 · Giovanni Stagnitto🇨🇭
Identifying the flavour of reconstructed hadronic jets is critical for precision phenomenology and the search for new physics at collider experiments, as it allows to pinpoint specific scattering processes and reject backgrounds. Jet measurements at the LHC are almost universally performed using the anti- $k_{T}$ algorithm, however no approach exists to define the jet flavour for this algorithm that is infrared and collinear (IRC) safe. We propose a new approach, a flavour dressing algorithm, that is IRC safe to all orders in perturbation theory and can be combined with any definition of a jet. We test the algorithm in $e^{+} e^{-}$ and $pp$ environments, and consider the $pp \to Z + b -jet$ process as a practical application.
hep-phhep-exPRL(2023)·71 citations
18*
The Geometric $ν$ SMEFT: Operators and Connections
Jim Talbert🇬🇧
We write down a geometric realization of the Standard Model Effective Field Theory (SMEFT) extended by $n_{f}$ flavours of light sterile neutrinos, a so-called geo $ν$ SMEFT. As with the geoSMEFT introduced by Helset, Martin and Trott, we show that a refactorization of the $ν$ SMEFT's operator product expansion is possible, such that two- and three-point composite operator forms are dressed with field-space connections composed of towers of Higgs dressings and symmetry generators, valid at \emph{all-orders} in the $v_{T} /Λ$ expansion parameter of the EFT ( $v_{T} \equiv 2 ⟨ H^{†} H ⟩$ ) . These connections are parameterized by real Higgs coordinates and contribute to the field-space geometry of the ( $ν$ )SM, with structure linked to the strength of Beyond-the-( $ν$ )Standard Model physics encoded in $v_{T} /Λ$ . In addition to enumerating the relevant composite operators and associated connections, we briefly outline the route to calculating all- $v_{T} /Λ$ -orders amplitudes, including the flavor-invariant theory required to understand the neutrino mass-eigenstate basis geometrically.
hep-phJHEP(2023)·21 citations
19*
Out of this world neutrino oscillations
Tony Gherghetta🇺🇸 · Andrey Shkerin🇺🇸
We study how vacuum neutrino oscillations can be affected by a causal, nonlinear and state-dependent modification of quantum field theory that may be interpreted using the many-worlds formulation of quantum mechanics. The effect is induced by a Higgs-neutrino Yukawa interaction that causes a nonlinear interference between the neutrino mass eigenstates. This leads to a tiny change in the oscillation pattern of light, active neutrinos without altering the oscillation frequencies. At large baselines where the oscillations disappear, the nonlinear effect is also suppressed and does not source correlations between the mass eigenstates once they are entangled with the environment. Our example provides a way to compute effects of nonlinear quantum mechanics and field theory that may probe the possible physical reality of many worlds.
↳ hep-thhep-phquant-phPRD(2023)·1 citation
20*
Three-body scattering and quantization conditions from $S$ matrix unitarity
Andrew W. Jackura🇺🇸
Two methodologies have been presented in the literature which connect relativistic three-particle scattering amplitudes with lattice QCD spectra -- the ``relativistic effective field theory'' approach and the ``finite-volume unitarity'' method. While both methods have been shown to be equivalent in various works, it has not been shown how to arrive at the relativistic effective field theory results directly from $S$ matrix unitarity. In this work, we provide a simple proof of the relativistic effective field theory form of the scattering equations directly from unitarity. Motivated by the finite-volume unitarity approach, we then postulate a set of quantization conditions which relate the finite-volume energy spectra to the $K$ matrices which drive the short-distance physics in the scattering equations, obtaining all previously known results for three identical particles. This work also presents new relations which provide a new pathway to generalize the results to arbitrary systems.
↳ hep-lathep-phnucl-thPRD(2023)·34 citations
21*
Recent results from the TOTEM collaboration and the discovery of the odderon
C. Royon🇺🇸
We describe the most recent results from the TOTEM collaboration on elastic, inelastic and total cross sections as well as the odderon discovery by the D0 and TOTEM collaborations.
↳ hep-exhep-phSciPost Phys.Proc.(2023)·2 citations
22*
Measurements of branching fractions of $Λ_{c}^{+} \to Σ^{+} η$ and $Λ_{c}^{+} \to Σ^{+} η^{'}$ and asymmetry parameters of $Λ_{c}^{+} \to Σ^{+} π^{0}$ , $Λ_{c}^{+} \to Σ^{+} η$ , and $Λ_{c}^{+} \to Σ^{+} η^{'}$
Belle Collaboration: S. X. Li🇨🇳 · C. P. Shen🇨🇳 · I. Adachi🇯🇵 · J. K. Ahn🇰🇷 · H. Aihara🇯🇵 · D. M. Asner🇺🇸 · H. Atmacan🇺🇸 · T. Aushev🇷🇺 · R. Ayad🇸🇦 · V. Babu🇩🇪 · S. Bahinipati🇮🇳 · Sw. Banerjee🇺🇸 and 158 other authors
We report a study of $Λ_{c}^{+} \to Σ^{+} π^{0}$ , $Λ_{c}^{+} \to Σ^{+} η$ , and $Λ_{c}^{+} \to Σ^{+} η^{'}$ using the data sample corresponding to an integrated luminosity of 980 $f b^{- 1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. The branching fractions relative to $Λ_{c}^{+} \to Σ^{+} π^{0}$ are measured as: $B_{Λ_{c}^{+} \to Σ^{+} η} / B_{Λ_{c}^{+} \to Σ^{+} π^{0}} = 0.25 \pm 0.03 \pm 0.01$ and $B_{Λ_{c}^{+} \to Σ^{+} η^{'}} / B_{Λ_{c}^{+} \to Σ^{+} π^{0}} = 0.33 \pm 0.06 \pm 0.02$ . Using $B_{Λ_{c}^{+} \to Σ^{+} π^{0}} = (1.25 \pm 0.10) %$ , we obtain $B_{Λ_{c}^{+} \to Σ^{+} η} = (3.14 \pm 0.35 \pm 0.11 \pm 0.25) \times 1 0^{- 3}$ and $B_{Λ_{c}^{+} \to Σ^{+} η^{'}} = (4.16 \pm 0.75 \pm 0.21 \pm 0.33) \times 1 0^{- 3}$ . Here the uncertainties are statistical, systematic, and from $B_{Λ_{c}^{+} \to Σ^{+} π^{0}}$ , respectively. The ratio of the branching fraction of $Λ_{c}^{+} \to Σ^{+} η^{'}$ with respect to that of $Λ_{c}^{+} \to Σ^{+} η$ is measured to be $B_{Λ_{c}^{+} \to Σ^{+} η^{'}} / B_{Λ_{c}^{+} \to Σ^{+} η} = 1.34 \pm 0.28 \pm 0.06$ . We update the asymmetry parameter of $Λ_{c}^{+} \to Σ^{+} π^{0}$ , $α_{Σ^{+} π^{0}} = - 0.48 \pm 0.02 \pm 0.02$ , with a considerably improved precision. The asymmetry parameters of $Λ_{c}^{+} \to Σ^{+} η$ and $Λ_{c}^{+} \to Σ^{+} η^{'}$ are measured to be $α_{Σ^{+} η} = - 0.99 \pm 0.03 \pm 0.05$ and $α_{Σ^{+} η^{'}} = - 0.46 \pm 0.06 \pm 0.03$ for the first time.
↳ hep-exhep-phPRD(2023)·19 citations
23*
Broader view of bimetric MOND
Mordehai Milgrom🇮🇱
All existing treatments of bimetric MOND (BIMOND) -- a class of relativistic versions of MOND -- have dealt with a rather restricted sub-class: The Lagrangian of the interaction between the gravitational degrees of freedom -- the two metrics -- is a function of a certain {\it single} scalar argument built from the difference in connections of the two metrics. I show that the scope of BIMOND is much richer: The two metrics can couple through several scalars to give theories that all have a "good" nonrelativistic (NR) limit -- one that accounts correctly, a-la MOND, for the dynamics of galactic systems, {\it including gravitational lensing}. This extended-BIMOND framework exhibits a qualitative departure from the way we think of MOND at present, as encapsulated, in all its aspects, by one "interpolating function" of one acceleration variable. After deriving the general field equations, I pinpoint the subclass of theories that satisfy the pivotal requirement of a good NR limit. These involve three independent, quadratic scalar variables. In the NR limit these scalars all reduce to the same acceleration scalar, and the NR theory then does hinge on one function of a {\it a single} acceleration variable -- representing the NR MOND "interpolating function", whose form is largely dictated by the observed NR galactic dynamics. However, these scalars behave differently, in different relativistic contexts. So, the full richness of the multi-variable Lagrangian, as it enters cosmology, for example, is hardly informed by what we learn from observations of galactic dynamics. In this paper, I present the formalism, with some generic examples. I also consider some cosmological solutions where the two metrics are small departures from one Friedman-Lemaitre-Robertson-Walker metric. This may offer a framework for describing cosmology within the extended BIMOND.
↳ gr-qcastro-ph.COastro-ph.GAhep-phPRD(2022)·14 citations
24*
What Quantum Strings can tell us about Quantum Gravity
Yuri Makeenko🇷🇺
I describe the recent progress in resolving two problems of nonperturbative bosonic string inherited from 1980's. Both the lattice and KPZ-DDK no-go theorems can be bypassed thanks to specific features of the theory with diffeomorphism invariance.
↳ hep-thhep-phPhys.Part.Nucl.Lett.(2023)·0 citations
25*
The JADE Experiment at the PETRA $e^{+} e^{-}$ collider -- history, achievements and revival
S. Bethke🇩🇪 · A. Wagner🇩🇪
The JADE experiment was one of five large detector systems taking data at the electron-positron collider PETRA, from 1979 to 1986, at $e^{+} e^{-}$ annihilation centre-of-mass energies from 12 to 46.7 GeV. The forming of the JADE collaboration, the construction of the apparatus, the most prominent physics highlights, and the post-mortem resurrection and preservation of JADE's data and software are reviewed.
↳ hep-exhep-phEur.Phys.J.H(2022)·7 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.