Borough of Manhattan Community College

CHamoru people, the Indigenous peoples of the Mariana Islands, have long been voyagers. In contemporary times, their voyages across the United States and beyond have become a source of discussion by scholars, artists, and activists. This essay illustrates how poetry of the CHamoru diaspora illuminates our interconnectedness to one another across geographical distance: relationality, in other words, not remoteness. I focus on the works of two diasporic CHamoru writers, Lehua Taitano and Clarissa Mendiola, who utilize similar imagery rooted in CHamoru voyaging epistemologies. Instead of foregrounding the geographical barriers between Guam and the continental United States, Mendiola’s and Taitano’s imagery enacts a decolonial poetics that illustrates the interconnectedness of CHamoru communities in the Pacific and beyond.

Quasi-periodic eruptions (QPEs) are rapid, recurring X-ray bursts from supermassive black holes, believed to result from interactions between accretion disks and surrounding matter. The galaxy SDSS1335+0728, previously stable for two decades, exhibited an increase in optical brightness in December 2019, followed by persistent active galactic nucleus (AGN)-like variability for 5 yr, suggesting the activation of a ~10⁶-M⊙ black hole. Since February 2024, X-ray emission has been detected, revealing extreme ~4.5-d QPEs with high fluxes and amplitudes, long timescales, large integrated energies and a ~25-d superperiod. Low-significance UV variations are reported, probably related to the long timescales and large radii from which the emission originates. This discovery broadens the possible formation channels for QPEs, suggesting that they are linked not solely to tidal disruption events but more generally to newly formed accretion flows, which we are witnessing in real time in a turn-on AGN candidate.

Nairobi Hip Hop Flow combines ethnographic methods, political history, and music and performance analysis to illustrate the richness of hip hop’s embodied performance practices. RaShelle R. Peck examines how hip hop artists in Nairobi’s underground rap culture engage with political seriousness in lyrics and sound by fostering a creative playfulness using bodily movement. This unprecedented study shows how Nairobi artists circulate diasporic blackness while at the same time indigenizing hip hop music to interrogate Kenya’s sociopolitical landscape.

Nairobi Hip Hop Flow combines ethnographic methods, political history, and music and performance analysis to illustrate the richness of hip hop’s embodied performance practices. RaShelle R. Peck examines how hip hop artists in Nairobi’s underground rap culture engage with political seriousness in lyrics and sound by fostering a creative playfulness using bodily movement. This unprecedented study shows how Nairobi artists circulate diasporic blackness while at the same time indigenizing hip hop music to interrogate Kenya’s sociopolitical landscape.

Nairobi Hip Hop Flow combines ethnographic methods, political history, and music and performance analysis to illustrate the richness of hip hop’s embodied performance practices. RaShelle R. Peck examines how hip hop artists in Nairobi’s underground rap culture engage with political seriousness in lyrics and sound by fostering a creative playfulness using bodily movement. This unprecedented study shows how Nairobi artists circulate diasporic blackness while at the same time indigenizing hip hop music to interrogate Kenya’s sociopolitical landscape.

Nairobi Hip Hop Flow combines ethnographic methods, political history, and music and performance analysis to illustrate the richness of hip hop’s embodied performance practices. RaShelle R. Peck examines how hip hop artists in Nairobi’s underground rap culture engage with political seriousness in lyrics and sound by fostering a creative playfulness using bodily movement. This unprecedented study shows how Nairobi artists circulate diasporic blackness while at the same time indigenizing hip hop music to interrogate Kenya’s sociopolitical landscape.

Nairobi Hip Hop Flow combines ethnographic methods, political history, and music and performance analysis to illustrate the richness of hip hop’s embodied performance practices. RaShelle R. Peck examines how hip hop artists in Nairobi’s underground rap culture engage with political seriousness in lyrics and sound by fostering a creative playfulness using bodily movement. This unprecedented study shows how Nairobi artists circulate diasporic blackness while at the same time indigenizing hip hop music to interrogate Kenya’s sociopolitical landscape.

Nairobi Hip Hop Flow combines ethnographic methods, political history, and music and performance analysis to illustrate the richness of hip hop’s embodied performance practices. RaShelle R. Peck examines how hip hop artists in Nairobi’s underground rap culture engage with political seriousness in lyrics and sound by fostering a creative playfulness using bodily movement. This unprecedented study shows how Nairobi artists circulate diasporic blackness while at the same time indigenizing hip hop music to interrogate Kenya’s sociopolitical landscape.

Nairobi Hip Hop Flow combines ethnographic methods, political history, and music and performance analysis to illustrate the richness of hip hop’s embodied performance practices. RaShelle R. Peck examines how hip hop artists in Nairobi’s underground rap culture engage with political seriousness in lyrics and sound by fostering a creative playfulness using bodily movement. This unprecedented study shows how Nairobi artists circulate diasporic blackness while at the same time indigenizing hip hop music to interrogate Kenya’s sociopolitical landscape.

A bstract A search for the production of a Higgs boson and one or more charm quarks, in which the Higgs boson decays into a photon pair, is presented. This search uses proton-proton collision data with a centre-of-mass energy of $\sqrt{s}$ s = 13 TeV and an integrated luminosity of 140 fb − 1 recorded by the ATLAS detector at the Large Hadron Collider. The analysis relies on the identification of charm-quark-containing jets, and adopts an approach based on Gaussian process regression to model the non-resonant di-photon background. The observed (expected, assuming the Standard Model signal) upper limit at the 95% confidence level on the cross-section for producing a Higgs boson and at least one charm-quark-containing jet that passes a fiducial selection is found to be 10.6 pb (8.8 pb). The observed (expected) measured cross-section for this process is 5 . 3 ± 3 . 2 pb (2 . 9 ± 3 . 1 pb).

A search for a light charged Higgs boson produced in decays of the top quark, $t \rightarrow H^{\pm } b$ t → H ± b with $H^{\pm } \rightarrow cs$ H ± → c s , is presented. This search targets the production of top-quark pairs $t\bar{t} \rightarrow Wb H^{\pm } b$ t t ¯ → W b H ± b , with $W \rightarrow \ell \nu$ W → ℓ ν ( $\ell = e, \mu$ ℓ = e , μ ), resulting in a lepton-plus-jets final state characterised by an isolated electron or muon and at least four jets. The search exploits b -quark and c -quark identification techniques as well as multivariate methods to suppress the dominant $t\bar{t}$ t t ¯ background. The data analysed correspond to $140\hbox { fb}^{-1}$ 140 fb - 1 of pp pp collisions at $\sqrt{s} = 13\hbox { TeV}$ s = 13 TeV recorded with the ATLAS detector at the LHC between 2015 and 2018. Observed (expected) 95% confidence-level upper limits on the branching fraction $\mathscr {B}(t\rightarrow H^{\pm } b)$ B ( t → H ± b ) , assuming $\mathscr {B}(t\rightarrow Wb) + \mathscr {B}(t \rightarrow H^{\pm } (\rightarrow cs)b)=1.0$ B ( t → W b ) + B ( t → H ± ( → c s ) b ) = 1.0 , are set between 0.066% (0.077%) and 3.6% (2.3%) for a charged Higgs boson with a mass between 60 and 168 GeV.

The ATLAS Google Project was established as part of an ongoing evaluation of the use of commercial clouds by the ATLAS Collaboration, in anticipation of the potential future adoption of such resources by WLCG grid sites to fulfil or complement their computing pledges. Seamless integration of Google cloud resources into the worldwide ATLAS distributed computing infrastructure was achieved at large scale and for an extended period of time, and hence cloud resources are shown to be an effective mechanism to provide additional, flexible computing capacity to ATLAS. For the first time a total cost of ownership analysis has been performed, to identify the dominant cost drivers and explore effective mechanisms for cost control. Network usage significantly impacts the costs of certain ATLAS workflows, underscoring the importance of implementing such mechanisms. Resource bursting has been successfully demonstrated, whilst exposing the true cost of this type of activity. A follow-up to the project is underway to investigate methods for improving the integration of cloud resources in data-intensive distributed computing environments and reducing costs related to network connectivity, which represents the primary expense when extensively utilising cloud resources.

A bstract Many extensions of the Standard Model, including those with dark matter particles, propose new mediator particles that decay into hadrons. This paper presents a search for such low mass narrow resonances decaying into hadrons using 140 fb − 1 of proton-proton collision data recorded with the ATLAS detector at a centre-of-mass energy of 13 TeV. The resonances are searched for in the invariant mass spectrum of large-radius jets with two-pronged substructure that are recoiling against an energetic photon from initial state radiation, which is used as a trigger to circumvent limitations on the maximum data recording rate. This technique enables the search for boosted hadronically decaying resonances in the mass range 20–100 GeV hitherto unprobed by the ATLAS Collaboration. The observed data are found to agree with Standard Model predictions and 95% confidence level upper limits are set on the coupling of a hypothetical new spin-1 Z ′ resonance with Standard Model quarks as a function of the assumed Z ′-boson mass in the range between 20 and 200 GeV.

A bstract This paper presents measurements of top-antitop quark pair ( $t\overline{t}$ t t ¯ ) production in association with additional b -jets. The analysis utilises 140 fb − 1 of proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider at a centre-of-mass energy of 13 TeV. Fiducial cross-sections are extracted in a final state featuring one electron and one muon, with at least three or four b -jets. Results are presented at the particle level for both integrated cross-sections and normalised differential cross-sections, as functions of global event properties, jet kinematics, and b -jet pair properties. Observable quantities characterising b -jets originating from the top quark decay and additional b -jets are also measured at the particle level, after correcting for detector effects. The measured integrated fiducial cross-sections are consistent with $t\overline{t}b\overline{b}$ t t ¯ b b ¯ predictions from various next-to-leading-order matrix element calculations matched to a parton shower within the uncertainties of the predictions. State-of-the-art theoretical predictions are compared with the differential measurements; none of them simultaneously describes all observables. Differences between any two predictions are smaller than the measurement uncertainties for most observables.

A bstract A search is performed for light, spin-0 bosons decaying into two photons in the 66 to 110 GeV mass range, using 140 fb − 1 of proton-proton collisions at $\sqrt{s}$ s = 13 TeV produced by the Large Hadron Collider and collected by the ATLAS detector. Multivariate analysis techniques are used to define event categories that improve the sensitivity to new resonances beyond the Standard Model. A model-independent search for a generic spin-0 particle and a model-dependent search for an additional low-mass Higgs boson are performed in the diphoton invariant mass spectrum. No significant excess is observed in either search. Mass-dependent upper limits at the 95% confidence level are set in the model-independent scenario on the fiducial cross-section times branching ratio into two photons in the range of 8 fb to 53 fb. Similarly, in the model-dependent scenario upper limits are set on the total cross-section times branching ratio into two photons as a function of the Higgs boson mass in the range of 19 fb to 102 fb.

This Practice Note is an interview with leading Circle‐keepers Kay Pranis and Becky McCammon about their experiences facilitating Talking Circles virtually during COVID. They describe their respective leaps into the unknown of online Circle to meet peoples' need for community at a time when we could not gather together in person and how they each managed during that time of uncertainty. The conversation was edited for length and clarity in which they discussed the needs of restorative justice practitioners and others for relational support and how they worked to meet the need. What they both learned is that while there were some challenges, there were also many unanticipated opportunities and benefits discovered in the process of adapting to virtual Circles. This retrospective interview documents how practitioners adapted quickly during a pandemic in response to the need to be in the community when we could not meet in person.

Properties of the underlying-event in pp interactions are investigated primarily via the strange hadrons $K_{S}^{0}$ K S 0 , $\Lambda$ Λ and $\bar{\Lambda }$ Λ ¯ , as reconstructed using the ATLAS detector at the LHC in minimum-bias pp collision data at $\sqrt{s} = 13$ s = 13 TeV. The hadrons are reconstructed via the identification of the displaced two-particle vertices corresponding to the decay modes "Equation missing" , $\Lambda \rightarrow \pi ^-p$ Λ → π - p and $\bar{\Lambda }\rightarrow \pi ^+\bar{p}$ Λ ¯ → π + p ¯ . These are used in the construction of underlying-event observables in azimuthal regions computed relative to the leading charged-particle jet in the event. None of the hadronisation and underlying-event physics models considered can describe the data over the full kinematic range considered. Events with a leading charged-particle jet in the range of $10 < p_T \le 40$ 10 < p T ≤ 40 GeV are studied using the number of prompt charged particles in the transverse region. The ratio $N(\Lambda + \bar{\Lambda })/N(K_{S}^{0})$ N ( Λ + Λ ¯ ) / N ( K S 0 ) as a function of the number of such charged particles varies only slightly over this range. This disagrees with the expectations of some of the considered Monte Carlo models.

The ATLAS tile calorimeter (TileCal) is the hadronic sampling calorimeter covering the central region of the ATLAS detector at the Large Hadron Collider (LHC). This paper gives an overview of the calorimeter’s operation and performance during the years 2015–2018 (Run 2). In this period, ATLAS collected proton–proton collision data at a centre-of-mass energy of 13 TeV and the TileCal was 99.65% efficient for data-taking. The signal reconstruction, the calibration procedures, and the detector operational status are presented. The performance of two ATLAS trigger systems making use of TileCal information, the minimum-bias trigger scintillators and the tile muon trigger, is discussed. Studies of radiation effects allow the degradation of the output signals at the end of the LHC and HL-LHC operations to be estimated. Finally, the TileCal response to isolated muons, hadrons and jets from proton–proton collisions is presented. The energy and time calibration methods performed excellently, resulting in good stability and uniformity of the calorimeter response during Run 2. The setting of the energy scale was performed with an uncertainty of 2%. The results demonstrate that the performance is in accordance with specifications defined in the Technical Design Report.

Proton–proton collision data recorded by the ATLAS detector in 2011, at a centre-of-mass energy of 7 TeV, have been used for an improved determination of the W -boson mass and a first measurement of the W -boson width at the LHC. Recent fits to the proton parton distribution functions are incorporated in the measurement procedure and an improved statistical method is used to increase the measurement precision. The measurement of the W -boson mass yields a value of $m_W = 80{,}366.5 \pm 9.8~(\text {stat.}) \pm 12.5~(\text {syst.})$ m W = 80 , 366.5 ± 9.8 ( stat. ) ± 12.5 ( syst. ) MeV $= 80{,}366.5 \pm 15.9$ = 80 , 366.5 ± 15.9 MeV, and the width is measured as $\Gamma _W = 2202 \pm 32~(\text {stat.}) \pm 34~(\text {syst.})$ Γ W = 2202 ± 32 ( stat. ) ± 34 ( syst. ) MeV $= 2202 \pm 47$ = 2202 ± 47 MeV. The first uncertainty components are statistical and the second correspond to the experimental and physics-modelling systematic uncertainties. Both results are consistent with the expectation from fits to electroweak precision data. The present measurement of $m_W$ m W is compatible with and supersedes the previous measurement performed using the same data.