Mon·Oct 14, 2024Monday·October 14, 2024

1. 01*

   Light scalar quarkonia from Laplace sum rule at NLO

   R.M. Albuquerque🇧🇷 · S. Narison🇫🇷 · D. Rabetiarivony🇲🇬

   We review our results on light scalar quarkonia ($\bar{q}q$ and four-quark states) from (inverse) QCD Laplace sum rules (LSR) and their ratios $\mathcal{R}$ within stability criteria and including higher order perturbative (PT) corrections up to the (estimated) $\mathcal{O}({\alpha }_s^5)$. As the Operator Product Expansion (OPE) usually converges for $D⩽6-8$, we evaluated the QCD spectral functions at Lowest Order (LO) of PT QCD and up to the $D=6$ dimension vaccum condensates. We request that the optimal results obey the constraint: Pole (Resonance) contribution to the spectral integral is larger than the QCD continuum one which excludes an on-shell mass around $(500-600)$MeV obtained for values of the QCD continuum threshold $t_c⩽(1\sim 1.5)$ GeV${}^2$. Our results for the different assignments of the scalar mesons are compiled in Tables 1 to 3

   hep-phNucl.Part.Phys.Proc.(2024)·1 citation
2. 02*

   Quantum Tomography at Colliders: With or Without Decays

   Kun Cheng🇺🇸 · Tao Han🇺🇸 · Matthew Low🇺🇸

   The interpretation of groups of particle spins at colliders as quantum states has opened up the possibility of using colliders for quantum information. While most efforts have focused on utilizing the decays of the particles to infer their spins to reconstruct the quantum density matrix, we show that the production kinematics of the particles provides sufficient information about the spins to establish quantum tomography without using the decays. We perform a comparative study, highlighting the advantages and disadvantages of using this "kinematic approach" relative to the usual "decay approach." Since the kinematic approach leverages the simplicity of scattering kinematics, this approach promises to achieve the optimal statistical results for quantum tomography at colliders.

   hep-phhep-exPLB(2025)·44 citations
3. 03*

   Consistent chiral limit in on-shell renormalized quark-meson model with ChPT scaling

   Vivek Kumar Tiwari🇮🇳

   Chiral perturbation theory (ChPT) predicted scaling of the pion,~kaon decay constants $f_{\pi },f_K$ and $M_{\eta }^2=m_{\eta }^2+m_{{\eta }^{\prime }}^2$ has been used in the renormalized $2+1$ flavor quark-meson (RQM) model,~to find a consistent path to chiral limit as the $\pi \text{and}K$ meson masses approach zero.~The left side of the Columbia plot is generated free from any ambiguity or heuiristic adjustment in the model parameter fixing away from the physical point. The on-shell renormalization of parameters and consistent treatment of the divergent quark one-loop vacuum fluctuations in the RQM model,~make the axial $U_A(1)$ anomaly significantly stronger and the light (strange) explicit chiral symmetry breaking strength becomes weaker by a small (relatively large) amount.~The first order chiral transition region in the $m_{\pi }-m_K$ and $\mu -m_K$ planes of Columbia plot,~increases due to the above novel features of the RQM model.~Comparing the softening effect of quark one-loop vacuum fluctuation on the chiral transition,~it looks overestimated in a recent functional renormalization group study.

   hep-phnucl-thPRD(2025)·5 citations
4. 04*

   The forward-backward asymmetry induced $CP$ asymmetry in ${\overline{B}}^0\to K^{-}{\pi }^{+}{\pi }^0$ in phase space around the resonances ${\overline{K}}^{\ast }(892{)}^0$ and ${\overline{K}}_0^{\ast }(700)$

   Jian-Yu Yang🇨🇳 · Yu-Jie Zhao🇨🇳 · Jing-Juan Qi🇨🇳 · Zhen-Hua Zhang🇨🇳

   The interference between amplitudes corresponding to different intermediate resonances plays an important role in generating large CP asymmetries in phase space in multi-body decays of bottom and charmed mesons. In this paper, we study the CP violation in the decay channel ${\overline{B}}^0\to K^{-}{\pi }^{+}{\pi }^0$ in phase space region where the intermediate resonances ${\overline{K}}^{\ast }(892{)}^0$ and ${\overline{K}}_0^{\ast }(700)$ dominate. The Forward-Backward Asymmetry (FBA) and the CP asymmetry induced by FBA (FB-CPA), which are closely related to the interference effects between the two aforementioned resonances, are especially investigated. The non-trivial correlation between FBA and FB-CPA is analyzed. The analysis indicates that the FB-CPAs around the resonance ${\overline{K}}^{\ast }(892{)}^0$ can be as large as about 35\%, which can be potentially accessible by Belle and Belle-II collaborations in the near future.

   hep-phhep-exCPC(2026)·0 citations
5. 05*

   Can a pseudoscalar with a mass of 365 GeV in two-Higgs-doublet models explain the CMS $t\bar{t}$ excess?

   Chih-Ting Lu🇨🇳 · Kingman Cheung🇹🇼 · Dongjoo Kim🇰🇷 · Soojin Lee🇰🇷 · Jeonghyeon Song🇰🇷

   We investigate the recently reported $t\bar{t}$ excess by the CMS Collaboration within the framework of conventional Two-Higgs-Doublet Models (2HDMs). Considering all four types (I, II, X, and Y), we perform a comprehensive parameter space scan using the best-fit values for a pseudoscalar boson $A$: $M_A=365$ GeV, ${\Gamma }_A/M_A=2\%$, and $\tan \beta =1.28$. Theoretical requirements and experimental constraints are systematically applied, including conditions from a bounded-below scalar potential, vacuum stability, unitarity, perturbativity, Flavor-Changing Neutral Currents (FCNCs), and direct searches at high-energy colliders. Our analysis shows that perturbativity imposes upper bounds of around 723 GeV on $M_{H^{\pm }}$ and $M_H$. FCNC constraints exclude all viable parameter space in Types II and Y, while a small region persists in Types I and X, but this region is ultimately ruled out by recent $t\bar{t}Z$ measurements by the ATLAS and CMS Collaborations at the LHC. We conclude that conventional 2HDMs alone cannot accommodate a pseudoscalar boson that explains the observed $t\bar{t}$ excess within viable parameter space. However, incorporating toponium effects in the background fit could potentially alter this conclusion.

   hep-phhep-exPLB(2024)·10 citations
6. 06*

   Gravitational waves from cosmic strings in Froggatt-Nielsen flavour models

   Simone Blasi🇩🇪 · Lorenzo Calibbi🇨🇳 · Alberto Mariotti🇧🇪 · Kevin Turbang🇧🇪

   Gravitational waves (GW) are a powerful probe of the earliest moments in the Universe, enabling us to test fundamental interactions at energy scales beyond the reach of laboratory experiments. In this work, we assess the GW capability to probe the origin of the flavour sector of the Standard Model (SM). Within the context of Froggatt-Nielsen models of fermion masses and mixing based on a gauged $U(1)$ flavour symmetry, we investigate the formation of cosmic strings and the resulting stochastic GW background (GWB), estimating the sensitivity to the model's parameter space of future GW experiments. Comparing these results with the bounds from low-energy flavour observables, we find that these two types of experimental probes of the model are nicely complementary. Flavour physics observables can probe low to intermediate symmetry-breaking scales $v_{\varphi }$, while future GW experiments are sensitive to the opposite regime, for which the string tension is large enough to yield sizeable GW signals, and in the long run can set an upper limit on the scale as stringent as $v_{\varphi }\lesssim 10^9$ GeV. In certain scenarios, the combination of flavour constraints and future GW bounds can bring about a complete closure of the available parameter space, which illustrates how GWB searches can play an important role in testing the origin of the SM flavour sector even if that occurs at ultra-high energies.

   hep-phJHEP(2025)·9 citations
7. 07*

   Almost general analysis of CKM and MNS matrices for hierarchical Yukawa structure and interpretation of Dirac CP phase probed by DUNE and T2HK

   Masaki J. S. Yang🇯🇵

   In this letter, we perform an almost general analysis of flavor-mixing matrices $V_{\mathrm{CKM}}$ and $U_{\mathrm{MNS}}$ to investigate the discriminative power of CP phases by next-generation neutrino oscillation experiments. As an approximation, we neglect the 1-3 mixing of diagonalization for more hierarchical fermions $u,e$. Thus there are two sources of CP violation in $V_{\mathrm{CKM}}$ and $U_{\mathrm{MNS}}$, the intrinsic CP phase ${\delta }_{d,\nu }$ in diagonalization of less hierarchical fermions $d,\nu$ and relative phases between two unitary matrices. By eliminating unphysical phases and imposing constraints of the three measured mixing angles, the flavor-mixing matrices are analytically displayed by two phases and the 1-2 mixing $s_{u,e}$ of more hierarchical fermions. For sufficiently small 1-2 mixing $s_e$ of charged leptons, the Dirac phase $\delta$ is mostly identical to the intrinsic phase of neutrinos ${\delta }_{\nu }$. Therefore, future detection of the Dirac phase indicates the observation of ${\delta }_{\nu }$. On the other hand, if such a CP violation is not observed, an upper limit is placed on a combination of ${\delta }_{\nu }$ and relative phases.

   hep-phPLB(2025)·8 citations
8. 08*

   Femtoscopy correlation functions and mass distributions from production experiments

   M. Albaladejo🇪🇸 · A. Feijoo🇩🇪 · J. Nieves🇪🇸 · E. Oset🇪🇸 · I. Vidaña🇮🇹

   We discuss the relation between the Koonin-Pratt femtoscopic correlation function (CF) and invariant mass distributions from production experiments. We show that the equivalence is total for a zero source-size and that a Gaussian finite-size source provides a form-factor for the virtual production of the particles. Motivated by this remarkable relationship, we study an alternative method to the Koonin-Pratt formula, which connects the evaluation of the CF directly with the production mechanisms. The differences arise mostly from the $T$-matrix quadratic terms and increase with the source size. We study the case of the $D^0{D}^{\ast +}$ and $D^{+}{D}^{\ast 0}$ correlation functions of interest to unravel the dynamics of the exotic $T_{cc}(3875{)}^{+}$, and find that these differences become quite sizable already for 1 fm sources. We nevertheless conclude that the lack of coherence in high-multiplicity-event reactions and in the creation of the fire-ball source that emits the hadrons certainly make much more realistic the formalism based on the Koonin-Pratt equation. We finally derive an improved Lednicky-Lyuboshits (LL) approach, which implements a Lorentz ultraviolet regulator that corrects the pathological behaviour of the LL CF in the punctual source-size limit.

   hep-phhep-exPRD(2024)·31 citations
9. 09*

   Enhancing the Sensitivity to Seesaw Predictions in Gauged $B-L$ Scenarios

   Francesco Capozzi🇮🇹 · Bhaskar Dutta🇺🇸 · Gajendra Gurung🇺🇸 · Wooyoung Jang🇺🇸 · Ian M. Shoemaker🇺🇸 · Adrian Thompson🇺🇸 · Jaehoon Yu🇺🇸

   New gauge bosons coupled to heavy neutral leptons (HNLs) are simple and well-motivated extensions of the Standard Model. In searches for HNLs in proton fixed-target experiments, we find that a large population of gauge bosons ($Z^{\prime }$) produced by proton bremsstrahlung may decay to HNLs, leading to a significant improvement in existing bounds on the ($m_{HNL},U_{\alpha }$), where $U_{\alpha }$ represent the mixing between HNL and the active neutrinos with flavor $\alpha$. We study this possibility in fixed target experiments with the 8 GeV proton beams, including SBND, MicroBooNE, and ICARUS, as well as DUNE and DarkQuest at 120 GeV. We find the projected sensitivities to additional $Z^{\prime }$-mediated HNL production can bring the seesaw mechanism of the neutrino masses within a broadened experimental reach.

   hep-phPRD(2025)·4 citations
10. 10*

    Prospects for sub-EW-scale ALP searches via $\gamma +b\bar{b}$ signatures at the LHC using jet substructure techniques

    Amit Adhikary🇫🇷 · Aoife Bharucha🇫🇷 · Lorenzo Feligioni🇫🇷 · Michele Frigerio🇫🇷

    The current Large Hadron Collider (LHC) data show no clear indication of new physics and only incremental improvements are anticipated at the energy frontier in the near future. However, while the focus of the LHC has been on constraining TeV scale physics, new particles could still be hiding below the electroweak scale. In order to obtain sensitivity to a new light boson with couplings to SM fermions, a potentially promising decay channel, for resonances with mass $\gtrsim \mathcal{O}(10)$ GeV, would be the decay to $b\bar{b}$ pairs. The measurement of such signatures is challenging due to the trigger requirements at the LHC. In this work, we explore the LHC sensitivity to a light pseudoscalar, or axion-like particle (ALP), in the $b\bar{b}$ final state with an associated photon, using jet substructure techniques, in the mass range between 10 GeV and 100 GeV. We obtain projected exclusions on the ALP-fermion coupling in a region of phase space which has not so far been probed by direct searches. We further discuss the impact that lower trigger thresholds may have on the LHC reach.

    hep-phhep-exhep-thPRD(2025)·5 citations
11. 11*

    Two Flavour Neutrino Oscillation in Matter and Quantum Entanglement

    Bipin Singh Koranga🇮🇳 · Baktiar Wasir Farooq🇮🇳

    In this article, we investigate the entanglement entropy for neutrino oscillations when neutrino propogate in matter, utilising Von Neumann entropy. We discuss two flavour neutrino oscillation in vaccum and matter. We demonstrate statistically that, depending on the length of oscillation for each energy, the entanglement entropy for the succeeding periods of the two-flavor neutrino oscillations in matter.

    hep-phInt.J.Quant.Inf.(2026)·4 citations
12. 12*

    Hole in the Deuteron

    Misak M Sargsian🇺🇸

    We introduce a new observable, $A_{node}$, that allows to isolate the node in the S-partial wave distribution of the deuteron in high $Q^2$ electro-disintegration processes with tensor polarized target. The node is a signature of nuclear repulsive core and represents a crucial test of its strength, size as well as the role of the relativistic and non-nucleonic effects in a deeply bound state. Within plane wave impulse approximation the node immitates a ``hole" through which incoming probe passes through without interaction. It is demonstrated that high $Q^2$ electro-disintegration processes due to their strong anisotropy of final state interaction effects, allow to gain an unprecedented access to the node, opening up a new venue in probing elusive dynamics of the nuclear repulsive core.

    ↳ nucl-thhep-phnucl-ex3 citations
13. 13*

    Spectrum of two-flavored spin-zero heavy dibaryons in lattice QCD

    Parikshit M. Junnarkar🇩🇪 · Nilmani Mathur🇮🇳

    We present the ground state energy spectra of two-flavored heavy dibaryons in the spin-singlet channel. In particular, the ground state masses of ${\Omega }_{llQ}{\Omega }_{llQ},{\Omega }_{QlQ}{\Omega }_{llQ}$ and ${\Omega }_{QlQ}{\Omega }_{QlQ}$ states are computed and compared with their respective lowest non-interacting energy levels, where the flavor $Q\in (c,b)$ denotes charm and bottom quarks, and the other flavor $l\in s,c,b$ represents strange, charm and bottom, respectively. Considering their valence quark structures, these hadrons could be thought of as the heavy flavor analogues of spin-singlet nucleon-nucleon states. The gauge configurations employed in this study are HISQ ensembles with $N_f=2+1+1$ flavors, generated by the MILC collaboration, at four lattice spacings, namely $a=0.1207,0.0888,0.0582$ and $0.0448$ fm. The aforementioned states are also computed at different quark masses, between $m_s\le m_l\le m_b$, including at unphysical heavy quark masses, to explore the quark mass dependence of any possible binding. For the dibaryon states ${\Omega }_{bbc}{\Omega }_{bbc},{\Omega }_{ccb}{\Omega }_{ccb}$ and ${\Omega }_{ccb}{\Omega }_{bbc}$, we find a clear evidence of an energy level below their respective non-interacting energy levels. In addition, for these dibaryons at quark masses $m_c<m_l\le m_b$, a trend is found where the gap, between the lowest energy levels and the respective lowest non-interacting levels, increases as the quark mass $m_l$ increases. We also study the heavy quark spin-symmetry and its breaking for these heavy dibaryons.

    ↳ hep-lathep-phPRD(2025)·13 citations
14. 14*

    Gravitational waves in ultra-slow-roll and their anisotropy at two loops

    Juan Álvarez Ruiz🇪🇸 · Julián Rey🇩🇪

    We compute the non-Gaussian corrections to the energy density and anisotropies of gravitational waves induced during the radiation era after an ultra-slow-roll phase of inflation by using a diagrammatic approach, and present the corresponding Feynman rules. Our two-loop calculation includes both the intrinsic non-Gaussianity of the inflaton perturbation $\delta \varphi$ and the non-Gaussianity arising from the nonlinear relation between the latter and the curvature perturbation $\mathcal{R}$, which we find to be subdominant with respect to the former. We apply our formalism to an analytical model in which the ultra-slow-roll phase is followed by a constant-roll stage with a nonvanishing second slow-roll parameter $\eta$, and address the renormalization of the one-loop scalar power spectrum in this scenario.

    ↳ astro-ph.COgr-qchep-phJCAP(2025)·18 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.