Asymmetry In Production Research Articles

Charging effects on Rosetta dust measurements

ABSTRACT Dust particles released from comet 67P/Churyumov-Gerasimenko collect electrostatic charges. Their motion is influenced by the electric fields induced by the flow of the solar wind and by the charging of the Rosetta spacecraft itself. Dust grains with sufficiently low tensile strength might even be destroyed en route from the nucleus to Rosetta. A simple model of the plasma environment is discussed here to enable simultaneously following the charging and the dynamics of dust particles as a function of the heliocentric distance of the comet, the distance between Rosetta and the nucleus, the asymmetry in gas production between the northern and southern hemispheres of the nucleus, the amplitude and timing of ultraviolet flares, and the possible outbursts intermittently increasing the production rate of the comet. The electrostatic disruption, and the combination of attractive and repulsive forces between the dust grains and Rosetta might significantly alter the conclusions about the size and spatial distributions of dust grains released from 67P/Churyumov-Gerasimenko. These calculations are presented to help assess the effects of dust and spacecraft charging in the analysis and interpretation of dust measurements by Rosetta.

Revealing the mystery of the double charm tetraquark in pp collision

A novel approach is proposed to probe the nature of the double charm tetraquark through the prompt production asymmetry between Tc¯c¯-\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$T_{\\bar{c}\\bar{c}}^-$$\\end{document} and Tcc+\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$T_{cc}^+$$\\end{document} in pp collisions. When comparing two theoretical pictures, i.e. the compact tetraquark and hadronic molecular pictures, we find that the former one exhibits a significantly larger production asymmetry, enabling the unambiguous determination of the tetraquark’s internal structure. Additionally, distinctive differences in the transverse momentum and rapidity distributions of Tc¯c¯-\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$T_{\\bar{c}\\bar{c}}^-$$\\end{document} and Tcc+\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$T_{cc}^+$$\\end{document} cross sections emerge, particularly at pT≈2GeV\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$p_\ extrm{T}\\approx 2~\ extrm{GeV}$$\\end{document} and y≈±6\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$y\\approx \\pm 6$$\\end{document} at a center-of-mass energy of 14TeV\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$~\ extrm{TeV}$$\\end{document}. The insignificant asymmetry in hadronic molecular picture is because that hadronic molecules are produced in hadronic phase, where the phase space of their constituents needs to be taken into account rigorously. Our work can be extended to the exploration of other double heavy tetraquark candidates, offering a versatile approach to advance our understanding of exotic hadrons.

Revisiting azimuthal angular asymmetries in diffractive di-jet production

We explore the impact of initial state soft gluon radiations on the azimuthal angle asymmetries in photo-production of hard di-jet via coherent diffraction in ultraperipheral heavy ion collisions, as well as in electron-proton (ep) and electron-nucleus (eA) collisions. The primary production mechanism is identified as the diffractive production of two hard jets, accompanied by a collinear gluon emission along the beam direction. In contrast, the diffractive exclusive di-jet production, where the initial state radiation is absent, is suppressed due to color transparency. Our analysis shows that azimuthal asymmetries, traditionally attributed to final state gluon emissions, are reduced by the presence of initial state radiations. The sensitivity of azimuthal asymmetries to both initial and final state radiations suggests that they could provide novel insights into the mechanisms of di-jet production in diffractive processes.

Spin asymmetry and dipole moments in τ-pair production with ultraperipheral heavy ion collisions

Spin asymmetry and dipole moments in τ-pair production with ultraperipheral heavy ion collisions

Flavoured Majorana Dark Matter then and now: from freeze-out scenarios to LHC signatures

We study a simplified Dark Matter model in the Dark Minimal Flavour Violation framework. Our model complements the Standard Model with a flavoured Dark Matter Majorana triplet and a coloured scalar mediator that share a Yukawa coupling with the right-handed up-type quarks with the coupling matrix λ. We extend previous work on this topic by exploring a large range of cosmologically viable parameter space, including the coannihilation region and, in particular, the region of conversion-driven freeze-out, while considering constraints from D0–D¯0\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$ {D}^0\\hbox{--} {\\overline{D}}^0 $$\\end{document} mixing as well as constraints from direct and indirect Dark Matter searches. We find various realisations of conversion-driven freeze-out within the model, that open up allowed windows of parameter space towards small mass splittings and very weak Dark Matter couplings. Finally, we probe the model by reinterpreting current LHC searches for missing energy and long-lived particles. We point out gaps in the coverage of current constraints as well as new opportunities to search for the model at the LHC, in particular, the charge asymmetry in single-top production associated with jets and missing energy.

Scientific production in sexual and reproductive health and rights research according to gender and affiliation: An analysis of publications from 1972 to 2021.

Peer-reviewed literature is commonly used to assess academic progress and research excellency. However, representation in authorship of global health publications is biased and unfair. In order to shed light on current gaps towards attaining gender equality in scientific production and shift power asymmetries in global health research, we conducted an assessment of authorship trends from 1972 to 2021 with a focus on gender and geographic representation in scientific articles authored or co-authored by researchers affiliated with UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP). We searched PubMed, Web of Science, and HRP public reports for publications where at least one author was affiliated with HRP. Our main outcome measures were author gender and location of author affiliation, classified by region and country income group. We used descriptive statistics to characterize the publications under analysis as well as the total number of authors from the included papers. We applied a logistic regression model to explore associations between author gender and other characteristics of published articles and a time series analysis to assess how time can influence the inclusion of women as authors in a publication. Python and R were used for all analyses. A total of 1,484 publications with 14,424 listed authors representing 5,950 unique authors were included in our analysis: 42.5% were female, 35.1% male, and 22.4% unknown (p<0.0001). First authorship was more likely female (56.9%) and from a high-income country (74.6%, p<0.0001) while last authorship was mostly male (53.7%) also from a high-income country (82.5%, p<0.0001). Females more frequently published papers using qualitative data (61.4%) and reviews/estimates (59.4%) while men published more case control (70.7%) and randomised controlled studies (53.0%), p<0.0001. The adjusted odds of there being a female author increased 4% for every additional year that passed. While there are more females authoring articles as compared to the past, they are still lagging behind with regards to seniority and prestige. Likewise, female representation is closely tied to what institution they are affiliated with and where that institution is located. Global health research institutions need to actively promote change by ensuring women are included in research and research outputs, giving them opportunities to lead.

Accessing the gluon GTMD F1,4 in exclusive π0 production in ep collisions

We demonstrate that the longitudinal single target-spin asymmetry in exclusive π0 production in ep collisions can give access to the imaginary part of the gluon generalized transverse momentum distribution (GTMD) F1,4. Such a longitudinal spin asymmetry that results from the Coulomb-nuclear interference effect, leads to a characteristic azimuthal angular correlation of sin2ϕ, where ϕ is the azimuthal angle between the scattered lepton transverse momentum and the recoil proton’s transverse momentum. We also present a numerical estimate of the asymmetry for the kinematics accessible at EIC and EicC. Published by the American Physical Society 2024

Transverse momentum weighted Sivers asymmetries in SIDIS and Drell-Yan processes at COMPASS

We investigate the transverse momentum weighted Sivers asymmetries in the processes with transversely polarized proton target, including the PhTzMpsin⁡(ϕh−ϕS) weighted asymmetry in charged hadron production in semi-inclusive deeply inelastic scattering (SIDIS) and the qTMpsin⁡(ϕS) weighted asymmetry in π−p Drell-Yan process. These asymmetries can be expressed as the product of the transverse-moments of the transverse momentum dependent (TMD) parton distribution functions (PDFs) and fragmentation functions (FFs). Using the parametrization for the Sivers function of the proton, the unpolarized PDFs of proton and pion, and the unpolarized FF of charged hadron, we present the numerical calculation for weighted Sivers asymmetries in SIDIS and Drell-Yan processes at the kinematics of COMPASS. We find that our prediction for the SIDIS process is in agreement with the recent COMPASS measurement. Recent new high-statistics data of Sivers asymmetry measured in SIDIS process and Drell-Yan process from COMPASS favored the sign change of Sivers function. High-precision experimental data of weighted asymmetries are still needed to test the sign change property of the Sivers function between SIDIS and Drell-Yan processes and to constrain the sea quark Sivers function.

Updated numerical study of transverse single-spin asymmetries in single-inclusive pion production from lepton-nucleon collisions

We revisit the analysis of transverse single-spin asymmetries AN in lepton-nucleon scattering where only a single pion is detected in the final state, ℓN↑→hX. This observable is the Electron-Ion Collider (EIC) analogue to AN in proton-proton collisions, p↑p→hX, that has been studied intensely for decades, especially at the Relativistic Heavy Ion Collider (RHIC). We incorporate new theoretical developments in the collinear twist-3 framework and utilize recent extractions of (Sivers-like and Collins-like) quark-gluon-quark correlators in the numerical computations. We compare our calculations to HERMES measurements as well as make predictions for Jefferson Lab, COMPASS, and EIC kinematics. We further explore the role of next-to-leading order (NLO) corrections to the (twist-2) unpolarized cross section (denominator of AN) and consider what can be deduced empirically about the potential numerical significance of the full NLO calculation of AN in this process. We consider sources of theoretical uncertainty in our predictions, which present potential opportunities then for future measurements to improve our understanding of AN and multi-parton correlations in hadrons.

Analysis of anomalies using weak effective Hamiltonian with complex couplings and their impact on various physical observables

Abstract Recently, the experimental measurements of the branching ratios and different polarization asymmetries for processes occurring through flavor-changing-charged current transitions by BABAR, Belle, and LHCb have revealed some significant differences from the corresponding Standard Model (SM) predictions. This has triggered an interest to search for physics beyond the SM in the context of various new physics (NP) models and using the model-independent weak effective Hamiltonian (WEH). Assuming left-handed neutrinos, we add the dimension-six vector, (pseudo-)scalar, and tensor operators with complex Wilson coefficients (WCs) to the SM WEH. Using 60%, 30%, and 10% constraints resulting from the branching ratio of , we reassess the parametric space of these new physics WCs accommodating the current anomalies based on the most recent HFLAV data of and and Belle data of and . We find that the allowed parametric region of left-handed scalar couplings strongly depends on the constraints of the branching ratio, and the maximum pull from the SM predictions results from the &lt;60% branching ratio limit. Also, the parametric region changes significantly if we extend the analysis by adding LHCb data of and . Furthermore, due to the large uncertainties in the measurements of and , we derive the sum rules which complement them with and . Using the best-fit points of the new complex WCs along with the latest measurements of , we predict the numerical values of the observable , , and from the sum rules. The simultaneous dependence of abovementioned physical observables on the NP WCs is established by plotting their correlation with and , which are useful to discriminate between various NP scenarios. We find that the most significant impact of NP results from the WC . Finally, we study the impact of these NP couplings on various angular and triple product asymmetries that could be measured in some ongoing and future experiments. The precise measurements of these observables are important to check the SM and extract the possible NP.

ChatGPT and accounting in African contexts: Amplifying epistemic injustice

Large Language Models (LLMs) such as ChatGPT are likely to amplify epistemic injustice through the lack of transparency and traceability of data sources. The unethical alienation of original knowledge producers from their intellectual products, which are repackaged by LLMs as artificial intelligence, conceals power asymmetries in the global knowledge production and dissemination system. As elaborated by Miranda Fricker (2010), Western White male actors traditionally dominate knowledge production; therefore, ChatGPT and other LLMs are inclined to reproduce patriarchal perspectives as universal understandings of the World. Our commentary applies this logic to accounting practice and research in Africa, and asserts that epistemic injustice, resulting from colonization and racism, means that ontological and epistemological approaches situated in the accounting needs and experiences of African communities are missing from or poorly articulated by ChatGPT and other LLMs. If LLMs are to attain legitimacy as (ethical) sources of knowledge, regulation must be enforced to ensure transparency—as a foundation for promoting pluriversality and eliminating epistemic injustice.

Tt¯H Interactions and T-odd Correlations at Hadron Colliders

Abstract We explore C P -violation effects of Higgs-top interactions in the associated production of a Higgs boson with top-pair in the dileptonic decay modes of top-quark originating from proton proton collisions pp → t t ¯ H → ( l + ν l b ) ( l − ν l ¯ b ¯ ) H at NLO in QCD matched to parton shower via T-odd observables using momenta of various particles involved in the process. In particular, we predict the constraints on the C P -violating t t ¯ H coupling obtained through the production asymmetries associated with the T-odd observables in the dileptonic decay channel of the t t ¯ pair for the Large hadron collider (LHC) with centre-of-mass energy of 13 TeV and an integrated luminosity of 139 fb−1. We also present the corresponding limits for future hadron colliders, namely the High Luminosity LHC (HL-LHC) and the Future Circular Collider (FCC-hh). Our estimates of the t t ¯ H interaction strength reveal that the upper bound on pseudoscalar coupling c p corresponding to the largest asymmetry would be of about 1.57 × 10−2 at 2σ C.L. for c s = 1 at the LHC with S =13 TeV for an integrated luminosity of 139 fb−1. The respective limits for HL-LHC and FCC-hh with the projected Luminosities of 3 ab−1 and 30 ab−1 are found to be to 2.7 × 10−3 and 1.3 × 10−4 respectively at 2σ C.L.

Reflexive reciprocity under an ethics of care: Reflections from the field for refugee studies

Abstract By bringing reflexivity and reciprocity into conceptual dialogue in a discussion about the ethical framework of care in research, this article discusses how ‘reflexive reciprocity’ can be a research tool in migration studies. Taking reciprocity—the dynamics of giving and receiving—as an aspect contextually bound to the refugee experience, I propose that a relationship of giving and receiving helps undermine the inevitable power asymmetries in knowledge production. Reciprocity becomes all the more essential when researching refugee communities where narratives are prompted in a way that mirrors how refugees are elicited to give information within mechanisms of refugee governance, where they narrate their neediness, perform their vulnerability, and justify their deservingness in return for legal and humanitarian protection in traumatic processes that can be a distortion of the norms of reciprocity. This article invites researchers to address reciprocity in research, premised on the idea that an ethical framework of care should go beyond paying lip service to protect vulnerable and marginalized participants. Reflecting on my case study research with Syrian refugee women in Turkey, Ankara, I argue that reflexive reciprocity is both a tool for more rigorous data collection in a qualitative inquiry and a practical application of an ethical framework of care. In exploring instances where I could link reflexivity to action-oriented reciprocity through ‘everyday acts of caring’, I demonstrate that reflexive reciprocity can somewhat balance out the extractive nature of research and thereby contribute to the ongoing discussion about the ‘reflexive turn’ in migration studies.

Asymmetry in force production between unilateral and bilateral standing broad jumps in young senior amateur basketball players

The main aim of this study was to assess the between-session reliability of performance and asymmetry variables between unilateral and bilateral standing broad jumps (SBJ). Twenty-four amateur basketball players completed two identical sessions which consisted of four unilateral SBJs (two with each leg) and two bilateral SBJs. Mean and peak values of force, velocity and power, and impulse were obtained separately for each leg using a dual force platform. Inter-limb asymmetries were computed using the standard percentage difference for the unilateral SBJ, and the bilateral asymmetry index-1 for the bilateral SBJ. All performance variables generally presented an acceptable absolute reliability for both SBJs with some exceptions for mean force, mean power, and peak power obtained with both legs. Asymmetry variables always showed unacceptable reliability and slight to fair levels of agreement in their direction except for unilateral SBJ peak velocity and bilateral SBJ peak power that showed moderate agreement for both SBJs. These results highlight that single-leg performance variables can be generally obtained with acceptable reliability regardless of the SBJ variant, but the reliability of the inter-limb asymmetries in the conditions examined in the present study is unacceptable to track individual changes in ground reaction force production. El objetivo principal de este estudio fue evaluar la confiabilidad entre sesiones de variables de desempeño y asimetría entre saltos horizontales de pie unilaterales y bilaterales (SBJ). Veinticuatro jugadores de baloncesto amateur completaron dos sesiones idénticas que consistieron en cuatro SBJ unilaterales (dos con cada pierna) y dos SBJ bilaterales. Los valores medios y máximos de fuerza, velocidad y potencia e impulso se obtuvieron por separado para cada pierna utilizando dos plataformas de fuerza. Las asimetrías entre miembros se calcularon utilizando la diferencia porcentual estándar para la SBJ unilateral, y el índice de asimetría bilateral-1 para la SBJ bilateral. Todas las variables de rendimiento generalmente presentaron una fiabilidad absoluta aceptable para ambos SBJs, con algunas excepciones para la fuerza media, la potencia media y la potencia máxima obtenida con ambas piernas. Las variables asimétricas siempre mostraron una fiabilidad inaceptable tanto en magnitud como en dirección. Estos resultados ponen de manifiesto que las variables de rendimiento de una sola pierna se pueden obtener generalmente con fiabilidad aceptable independientemente de la variante SBJ, pero debido al cambio de dirección de la asimetrías entre sesiones, la fiabilidad de la ínter-asimetrías de las extremidades en las condiciones examinadas en el presente estudio son inaceptables para seguir los cambios individuales en la producción de fuerzas de reacción.

Dissonant intimacies: Coloniality and the failures of South–South collaboration

North–South research collaborations have come to include both an epistemic and ethical promise – of disrupting hierarchies, inequalities and asymmetries in global knowledge production. In practice, however, these have been ridden with limits, tension and failure. The ‘South–South’ has emerged as a worthy foil: an easy repository of positive affects and of decolonial futurity. This article turns to a feminist collaborative research initiative that seemed primed to fulfil these promises, but in fact, failed to do so. A partnership between African and Indian feminist scholars did not provide meaningful and reciprocal intellectual exchange. On the contrary, it powerfully revealed the coloniality of knowledge and power in higher education and how it manifested, differently, in two distinct locales in the Global South. This partnership constituted less of a shared ground, than one of complex and uneven relationships – a terrain of dissonant intimacies. It is not surprising that these were Southern scholars working in marginalised areas of research, like gender and sexuality. Such a double marginalisation produces specific sets of choices – and ambivalent desires – when it comes to being included in an unequal global epistemic order (and responding to neoliberal demands). This article contributes to larger debates on decolonising higher education, by shifting the scale from the North–South to the complexities of knowledge-making and power within and across the South.

Aging reduces manual dexterity and force production asymmetries between the hands

ABSTRACT Age-related effects on motor asymmetry provide insight into changes in cortical activation during aging. To investigate potential changes in manual performance associated with aging, we conducted the Jamar hand function test and the Purdue Pegboard test on young and older adults. All tests indicated reduced motor asymmetry in the older group. Further analysis suggested that a significant decline in dominant (right) hand function resulted in less asymmetric performance in older adults. The finding is inconsistent with the application of the HAROLD model in the motor domain, which assumes improved performance in the non-dominant hand, leading to a reduction of motor asymmetry in older adults. Based on the manual performance in young and older adults, it is suggested that aging reduces manual asymmetry in both force production and manual dexterity due to the reduced performance of the dominant hand.

Open charm production and asymmetry in pNe collisions at sqrt{s_{scriptscriptstyle {textrm{NN}}}} = 68.5,text {Gehspace{-1.00006pt}V}

A measurement of {{D}} ^0 meson production by the LHCb experiment in its fixed-target configuration is presented. The production of {{D}} ^0 mesons is studied with a beam of 2.5 ,text {Tehspace{-1.00006pt}V} protons colliding on a gaseous neon target at rest, corresponding to a nucleon–nucleon centre-of-mass energy of sqrt{s_{scriptscriptstyle text {NN}}} = 68.5,,text {Gehspace{-1.00006pt}V} . The sum of the {{D}} ^0 and {hspace{0.0pt}overline{hspace{0.0pt}{D}}} {}^0 production cross-section in ptext {Ne} collisions in the centre-of-mass rapidity range y^{star }in [-2.29, 0] is found to be sigma _{D^{0}}^{y^star in [-2.29, 0]} = 48.2 pm 0.3 pm 4.5 ,upmu text {b}/text {nucleon} where the first uncertainty is statistical and the second is systematic. The {{{D}} ^0}-{{hspace{0.0pt}overline{hspace{0.0pt}{D}}} {}^0} production asymmetry is also evaluated and suggests a trend towards negative values at large negative y^{star }. The considered models do not account precisely for all the features observed in the LHCb data, but theoretical predictions including 1% intrinsic charm and 10% recombination contributions better describe the data than the other models considered.

Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment

A measurement of the charge asymmetry in top-quark pair (tt¯) production in association with a photon is presented. The measurement is performed in the single-lepton tt¯ decay channel using proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider at CERN at a centre-of-mass-energy of 13 TeV during the years 2015–2018, corresponding to an integrated luminosity of 139 fb−1. The charge asymmetry is obtained from the distribution of the difference of the absolute rapidities of the top quark and antiquark using a profile likelihood unfolding approach. It is measured to be AC=−0.003±0.029 in agreement with the Standard Model expectation.

Contralateral Asymmetry in Cycling Power Is Reproducible and Independent of Exercise Intensity at Submaximal Power Outputs

The purpose of the current investigation was to examine the effects of exercise intensity on asymmetry in pedal forces when the accumulation of fatigue is controlled for, and to assess the reliability of asymmetry outcomes during cycling. Participants completed an incremental cycling test to determine maximal oxygen consumption and the power that elicited maximal oxygen consumption (pVO2max). Participants were allotted 30 min of recovery before then cycling at 60%, 70%, 80%, and 90% of pVO2max for 3 min each, with 5 min of active recovery between each intensity. Participants returned to the laboratory on separate days to repeat all measures. A two-way repeated measures analysis of variance (ANOVA) was utilized to detect differences in power production AI at each of the submaximal exercise intensities and between Trials 1 and 2. Intraclass correlations were utilized to assess the test–retest reliability for the power production asymmetry index (AI). An ANOVA revealed no significant intensity–visit interactions for the power production AI (f = 0.835, p = 0.485, η2 = 0.077), with no significant main effects present. ICC indicated excellent reliability in the power production AI at all intensities. Exercise intensity did not appear to affect asymmetry in pedal forces, while excellent reliability was observed in asymmetry outcomes.

{B}_c^{-}to J/psi left(to {mu}^{+}{mu}^{-}right){tau}^{-}left(to {pi}^{-}{nu}_{tau },{rho}^{-}{nu}_{tau },{ell}^{-}{overline{nu}}_{ell }{nu}_{tau}right){overline{nu}}_{tau } decays with visible final-state kinematics

The semitauonic {B}_c^{-}to J/psi {tau}^{-}{overline{nu}}_{tau } decay provides an ideal and clean mode to scrutinize possible new physics effects in bto c{tau}^{-}{overline{nu}}_{tau } transitions as indicated by the current data on R(D(*)) anomalies. In this work, we use the spin density matrix method to obtain the maximum information on the underlying physics of {B}_c^{-}to J/psi {tau}^{-}{overline{nu}}_{tau } decay with both polarized τ lepton and J/ψ meson. Their subsequent decays, with J/ψ → μ+μ− as well as τ− → π−ντ, τ− → ρ−ντ and {tau}^{-}to {ell}^{-}{overline{nu}}_{ell }{nu}_{tau } , are exploited to extract the energy and angular distributions of the charged final-state particles in the processes. Starting with the most general effective Hamiltonian relevant for the bto c{tau}^{-}{overline{nu}}_{tau } transitions, including all possible Lorentz structures of the dimension-six operators with both left- and right-handed neutrinos, we first derive the five-fold differential decay rate in terms of the visible final-state kinematics. From this distribution, we then construct in total 34 normalized observables, among which nine refer to the CP-violating triple product asymmetries that vanish within the Standard Model. We also construct five new observables based on the combinations of these normalized observables that can only be attributed to the right-handed neutrinos. On the other hand, considering the low statistics of the fully differential distribution, we introduce some integrated observables with only one kinematic variable left, which are more promising to be measured due to the largely increased statistics. The sensitivities of all these observables to the different new physics scenarios are investigated in detail. Finally, assuming an ideal circumstance, we give an estimate of the statistical uncertainties of the nine CP-conserving observables at LHCb and found that τ− → π−ντ has the highest analyzing power among the three τ decay channels.