HEP Phenomenology·hep-ph

Thu·Jan 4, 2024Thursday·January 4, 2024

13 papers—6 primary·7 cross-listed·reconstructed*

01*
High-energy QCD dynamics from bottom flavor fragmentation at the Hi-Lumi LHC
Francesco Giovanni Celiberto🇪🇸
We study the inclusive production of hadrons with bottom flavor at the LHC and its luminosity upgrade. We describe the collinear fragmentation of singly $b$ -flavored hadrons, $B$ mesons and $Λ_{b}$ baryons, via the KKSS07 determination of fragmentation functions, while for charmed $B$ mesons, $B_{c} (^{1} S_{0})$ and $B_{c} (^{3} S_{1})$ particles, we employ the novel ZCFW22 set, built on the basis of state-of-the-art nonrelativistic QCD inputs. We use the JETHAD multimodular working environment to analyze rapidity and transverse-momentum distributions for observables sensitive to the associated emission of two hadrons or a hadron-plus-jet system. Our reference formalism is the NLL/NLO $^{+}$ hybrid collinear and high-energy factorization, where the standard collinear description is improved by the inclusions of energy logarithms resummed up to the next-to-leading approximation and beyond. We provide a corroborating evidence that $b$ -flavor emissions act as fair stabilizers of the high-energy resummation, thus serving as valuable tools for precision studies of high-energy QCD. As a bonus, we highlight that the predicted production-rate hierarchy between noncharmed $b$ -hadrons and charmed $B_{c} (^{1} S_{0})$ mesons is in line with recent LHCb estimates. This serves as simultaneous benchmark both for the hybrid factorization and for the single-parton fragmentation mechanism based on initial-scale inputs calculated via the nonrelativistic QCD effective theory.
hep-phhep-exEPJC(2024)·36 citations
02*
Taming the Zoo of Tetraquarks and Pentaquarks using the HISH Model
Jacob Sonnenschein🇮🇱 · Michal Michael Green🇮🇱
In this paper we scan over all possible charmed tetraquarks and pentaquarks. Using the holography inspired stringy hadron (HISH) model we determine the trajectories associated with each of the exotic hadron candidates. The trajectories include further exotic states with higher angular momentum or higher stringy excited states. A trajectory is a property of a genuine exotic hadron and can be used to distinguish between the latter and a molecule. We examine 71 tetraquarks and 210 pentaquarks. Few of these states have already been found but most of the predicted zoo have yet not been discovered. We analyze the strong decay processes of these exotic hadrons and compute the corresponding decay widths of part of them.
hep-phhep-exhep-lathep-th7 citations
03*
Light thermal dark matter via type-I seesaw portal
Debasish Borah🇮🇳 · Pritam Das🇮🇳 · Satyabrata Mahapatra🇰🇷 · Narendra Sahu🇮🇳
We propose a minimal scenario for light thermal dark matter (DM) in sub-GeV to GeV range by incorporating a scalar singlet DM in a type-I seesaw scenario extended by an additional Higgs doublet $ϕ_{2}$ . The latter permits efficient annihilation of light scalar DM into leptonic final states including right-handed neutrinos (RHN). We keep the charged fermion as well as neutral fermion final states in forbidden regime to avoid bounds from indirect search as well as cosmic microwave background (CMB) data. After studying the purely forbidden DM scenario with neutral and charged fermion final states separately, we discuss the interplay of forbidden and non-forbidden channels in generating light thermal DM relic by considering neutral fermions in non-forbidden mode due to relatively weaker constraints. The model can also explain the anomalous magnetic moment of muon, W-mass anomaly and saturate experimental bounds on charged lepton flavour violation and DM direct detection while offering tantalising detection prospects of RHN, the mass of which is kept approximately in the same range as DM.
hep-phhep-exJHEP(2025)·5 citations
04*
Transverse momentum balance of dijets in Xe+Xe collisions at the LHC
Yao Li🇨🇳 · Shu-Wan Shen🇨🇳 · Sa Wang🇨🇳 · Ben-Wei Zhang🇨🇳
We present a theoretical study of the medium modifications of the $p_{T}$ balance ( $x_{J}$ ) of dijets in Xe+Xe collisions at $s_{N N} = 5.44$ TeV. The initial production of dijets was carried out using the POWHEG+PYTHIA8 prescription, which matches the next-to-leading-order (NLO) QCD matrix elements with the parton shower (PS) effect. The SHELL model described the in-medium evolution of nucleus-nucleus collisions using a transport approach. The theoretical results of the dijet $x_{J}$ in the Xe+Xe collisions exhibit more imbalanced distributions than those in the p+p collisions, consistent with recently reported ATLAS data. By utilizing the Interleaved Flavor Neutralisation, an infrared-and-collinear-safe jet flavor algorithm, to identify the flavor of the reconstructed jets, we classify dijets processes into three categories: gluon-gluon ( $g g$ ), quark-gluon ( $q g$ ), and quark-quark ( $q q$ ), and investigated the respective medium modification patterns and fraction changes of the $g g$ , $q g$ , and $q q$ components of the dijet sample in Xe+Xe collisions. It is shown that the increased fraction of $q g$ component at a small $x_{J}$ contributes to the imbalance of the dijet; in particular, the $q_{1} g_{2}$ (quark-jet-leading) dijets experience more significant asymmetric energy loss than the $g_{1} q_{2}$ (gluon-jet-leading) dijets traversing the QGP. By comparing the $Δ ⟨ x_{J} ⟩ = ⟨ x_{J} ⟩_{pp} - ⟨ x_{J} ⟩_{AA}$ of inclusive, $c c ˉ$ and $b b ˉ$ dijets in Xe+Xe collisions, we observe $Δ ⟨ x_{J} ⟩_{in c l .} > Δ ⟨ x_{J} ⟩_{c c ˉ} > Δ ⟨ x_{J} ⟩_{b b ˉ}$ . Moreover, $ρ_{X e, P b}$ , the ratios of the nuclear modification factors of dijets in Xe+Xe to those in Pb+Pb, were calculated, which indicates that the yield suppression of dijets in Pb+Pb is more pronounced than that in Xe+Xe owing to the larger radius of the lead nucleus.
hep-phnucl-thNucl.Sci.Tech.(2024)·17 citations
05*
The emission of soft-photons and the LBK theorem, revisited
Roger Balsach🇩🇪 · Domenico Bonocore🇩🇪 · Anna Kulesza🇩🇪
Predictions for processes involving soft photons, up to next-to-leading power (NLP) in the photon energy, can be obtained using the Low-Burnett-Kroll (LBK) theorem. The consistency of the theorem has been a recent topic of investigation since it is traditionally formulated in terms of a non-radiative amplitude, which is evaluated with unphysical momenta. We address such questions and propose a formulation of the LBK theorem which relies on the evaluation of the non-radiative amplitude with on-shell, physical momenta. We use this form to numerically study the impact of NLP contributions to cross-sections for $pp$ and $e^{-} e^{+}$ processes involving soft-photon emission.
hep-phActa Phys.Polon.Supp.(2024)·2 citations
06*
Semi-inclusive single-jet production in DIS at next-to-leading order in the Color Glass Condensate
Paul Caucal🇫🇷 · Elouan Ferrand🇫🇷 · Farid Salazar🇺🇸
Within the Color Glass Condensate (CGC) effective field theory, we derive the next-to-leading order (NLO) cross-section for the single-jet semi-inclusive cross-section in deep inelastic scattering (DIS) at small $x$ , for both longitudinally and transversely polarized virtual photons. We provide analytic expressions, valid at finite $N_{c}$ and suitable for numerical evaluation, for both the cross-section differential in rapidity and transverse momentum and the cross-section differential in rapidity only. Our NLO formulae demonstrate that the very forward rapidity regime is plagued by large double logarithmic corrections coming from phase space constraints on soft gluons close to the kinematic threshold for jet production. A joint resummation of small- $x$ and threshold logarithms at single logarithmic accuracy is proposed to remedy the instability of the cross-section in this regime. By integrating over the single-jet phase space, we recover known results for the NLO DIS structure functions at small $x$ , previously obtained using the optical theorem.
hep-phnucl-thJHEP(2024)·27 citations
07*
Current progress on the semileptonic form factors for $B ˉ \to D^{*} ℓ ν ˉ$ decay using the Oktay-Kronfeld action
Tanmoy Bhattacharya🇺🇸 · Benjamin J. Choi🇰🇷 · Rajan Gupta🇺🇸 · Yong-Chull Jang🇺🇸 · Seungyeob Jwa🇰🇷 · Sunghee Kim🇰🇷 · Sunkyu Lee🇰🇷 · Weonjong Lee · Jaehoon Leem🇰🇷 · Jeonghwan Pak🇰🇷 · Sungwoo Park🇺🇸
We present recent progress in calculating the semileptonic form factors $h_{A_{1}} (w)$ for the $B ˉ \to D^{*} ℓ ν ˉ$ decays. We use the Oktay-Kronfeld (OK) action for the charm and bottom valence quarks and the HISQ action for light quarks. We adopt the Newton method combined with the scanning method to find a good initial guess for the $χ^{2}$ minimizer in the fitting of the 2pt correlation functions. The main advantage is that the Newton method lets us to consume all the time slices allowed by the physical positivity. We report the first, reliable, but preliminary results for $h_{A_{1}} (w) / ρ_{A_{1}}$ at zero recoil ( $w = 1$ ). Here we use a MILC HISQ ensemble ( $a = 0.12$ fm, $M_{π}$ = 220 MeV, and $N_{f} = 2 + 1 + 1$ flavors).
↳ hep-lathep-phPoS(2023)·5 citations
08*
Progress report on testing robustness of the Newton method in data analysis on 2-point correlation function using a MILC HISQ ensemble
Tanmoy Bhattacharya🇺🇸 · Benjamin J. Choi🇰🇷 · Rajan Gupta🇺🇸 · Yong-Chull Jang🇺🇸 · Seungyeob Jwa🇰🇷 · Sunghee Kim🇰🇷 · Sunkyu Lee🇰🇷 · Weonjong Lee · Jaehoon Leem🇰🇷 · Jeonghwan Pak🇰🇷 · Sungwoo Park🇺🇸
We report recent progress in data analysis on the two point correlation functions which will be prerequisite to obtain semileptonic form factors for the $B_{(s)} \to D_{(s)} ℓ ν$ decays. We use a MILC HISQ ensemble for the measurement. We use the HISQ action for light quarks, and the Oktay-Kronfeld (OK) action for the heavy quarks ( $b$ and $c$ ). We used a sequential Bayesian method for the data analysis. Here we test the new fitting methodology of Benjamin J.~Choi in a completely independent manner.
↳ hep-lathep-phPoS(2023)·2 citations
09*
Fermion states localized on a self-gravitating Skyrmion
Vladimir Dzhunushaliev🇰🇿 · Vladimir Folomeev🇰🇬 · Jutta Kunz🇩🇪 · Yakov Shnir🇷🇺
We investigate self-gravitating solutions of the Einstein-Skyrme theory coupled to spin-isospin Dirac fermions and consider the dependence of the spectral flow on the effective gravitational coupling constant and on the Yukawa coupling. It is shown that the effects of the backreaction of the fermionic mode may strongly deform the configuration. Depending on the choice of parameters, solutions with positive, negative and zero ADM mass may arise. The occurrence of regular anti-gravitating asymptotically flat solutions with negative ADM mass is caused by the violation of the energy conditions.
↳ hep-thhep-phPLB(2024)·5 citations
10*
Exploration of the Muon $g - 2$ and Light Dark Matter explanations in NA64 with the CERN SPS high energy muon beam
Yu. M. Andreev · D. Banerjee🇨🇭 · B. Banto Oberhauser🇨🇭 · J. Bernhard🇨🇭 · P. Bisio🇮🇹 · N. Charitonidis🇨🇭 · P. Crivelli🇨🇭 · E. Depero🇨🇭 · A. V. Dermenev · S. V. Donskov · R. R. Dusaev · T. Enik and 45 other authors
We report on a search for a new $Z^{'}$ ( $L_{μ} - L_{τ}$ ) vector boson performed at the NA64 experiment employing a high energy muon beam and a missing energy-momentum technique. Muons from the M2 beamline at the CERN Super Proton Synchrotron with a momentum of 160 GeV/c are directed to an active target. A signal event is a single scattered muon with momentum $<$ 80 GeV/c in the final state, accompanied by missing energy, i.e. no detectable activity in the downstream calorimeters. For a total statistic of $(1.98 \pm 0.02) \times 1 0^{10}$ muons on target, no event is observed in the expected signal region. This allows us to set new limits on part of the remaining $(m_{Z^{'}}, g_{Z^{'}})$ parameter space which could provide an explanation for the muon $(g - 2)_{μ}$ anomaly. Additionally, our study excludes part of the parameter space suggested by the thermal Dark Matter relic abundance. Our results pave the way to explore Dark Sectors and light Dark Matter with muon beams in a unique and complementary way to other experiments.
↳ hep-exhep-phPRL(2024)·94 citations
11*
Constraining inflationary magnetogenesis and reheating via GWs in light of PTA data
Subhasis Maiti🇮🇳 · Debaprasad Maity🇮🇳 · L. Sriramkumar🇮🇳
By leveraging the limits on primordial magnetic fields (PMFs), their contributions to secondary gravitational waves (GWs), and the recent observations by the pulsar timing arrays (PTAs), we arrive at constraints on the epoch of reheating. We find that the combined spectral energy density of primary and secondary (generated by the PMFs) GWs can be described as a broken power law with different indices. We show that PMFs with blue spectra and appropriate reheating scenarios can successfully explain the PTA observations without invoking any new physics.
↳ astro-ph.COhep-phhep-th21 citations
12*
On the Hilbert Space of Dyons
Rishi Mouland🇬🇧 · David Tong🇬🇧
We revisit the construction of the Hilbert space of non-relativistic particles moving in three spatial dimensions. This is given by the space of sections of a line bundle that can in general be topologically non-trivial. Such bundles are classified by a set of integers--one for each pair of particles--and arise physically when we describe the interactions of dyons, particles which carry both electric and magnetic charges. The choice of bundle fixes the representation of the Euclidean group carried by the Hilbert space. These representations are shown to recover the 'pairwise helicity' formalism recently discussed in the literature.
↳ hep-thhep-phPRD(2024)·7 citations
13*
The Standard Model from String Theory: What Have We Learned?
Fernando Marchesano🇪🇸 · Gary Shiu🇺🇸 · Timo Weigand🇩🇪
Amidst all candidates of physics beyond the Standard Model, string theory provides a unique proposal for incorporating gauge and gravitational interactions. In string theory, a four-dimensional theory that unifies quantum mechanics and gravity is obtained automatically if one posits that the additional dimensions predicted by the theory are small and curled up, a concept known as compactification. The gauge sector of the theory is specified by the topology and geometry of the extra dimensions, and the challenge is to reproduce all the features of the Standard Model of Particle Physics from them. We review the state-of-the-art in reproducing the Standard Model from string compactifications, together with the lessons drawn from this fascinating quest. We describe novel scenarios and mechanisms that string theory provides to address some of the Standard Model puzzles, as well as the most frequent signatures of new physics that could be detected in future experiments. We finally comment on recent developments that connect, in a rather unexpected way, the Standard Model with Quantum Gravity, and that may change our field theory notion of naturalness.
↳ hep-thhep-phAnn.Rev.Nucl.Part.Sci.(2024)·53 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.