Saleem M

University of Central Oklahoma, ENGINEERING PHYSICS, Faculty Member

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My research interests are in the field of experimental high-energy physics.
The main aim of my work is to find the origin of the universe by creating what can be thought of as a miniature Big Bang, the conjectured source of the creation of the present universe, by colliding subatomic particles (protons) at ultra-high energies.
This can be done by producing similar conditions that are expected to exist a few seconds after the Big Bang using a giant particle accelerator called Large Hadron Collider (LHC) at CERN – Geneva, Switzerland. The LHC smashes protons at a speed very close to the speed of light in a tunnel 100 meters deep beneath the surface of the earth. This unlocks the secrets of our universe, such as: How our universe was evolved to its current state? What governs its behaviour today? How will it evolve in the future?
I am involved in searches for the Higgs boson (a still undiscovered essential component of the Standard Model (SM) of the particle physics) of the particle and the top physics. Top quark has large coupling to the Higgs boson and is the only quark that decays before hadronization (due to its large mass). The production top quark pairs at the LHC energies is a process situated at the boundary between the Standard Model and what might lie beyond it.
Top quark physics is also important to understand and calibrate the detector (during the early years of the data taking) before any discovery, at the ATLAS experiment at CERN.
The ATLAS at LHC is one the leading high energy physics experiments with large collaborations consisting of more almost 3000 people. My area of expertise includes identification of particle jets produced by heavy flavour hadrons (b-tagging). In terms of hardware, I played a key role in the commissioning and installation of the ATLAS pixel detector, the innermost (first after the LHC beam pipe) piece of the ATLAS.
Before Joining the ATLAS experiment, I also played an important role as a member of the BABAR collaboration at Stanford Linear Accelerator Centre (SLAC), CA, USA and the CLEO Collaboration at the Cornell University, NY, USA.
Address: CERN, GENEVA, SWITZERLAND

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Papers by Saleem M

$Research paper thumbnail of Direct CP Violating Asymmetry in B^{0}→ K^{+} π^{-} Decays$

Direct CP Violating Asymmetry in B^{0}→ K^{+} π^{-} Decays

B. Aubert,1 R. Barate,1 D. Boutigny,1 F. Couderc,1 J.-M. Gaillard,1 A. Hicheur,1 Y. Karyotakis,1 ... more B. Aubert,1 R. Barate,1 D. Boutigny,1 F. Couderc,1 J.-M. Gaillard,1 A. Hicheur,1 Y. Karyotakis,1 JP Lees,1 V. Tisserand,1 A. Zghiche,1 A. Palano,2 A. Pompili,2 JC Chen,3 ND Qi,3 G. Rong,3 P. Wang,3 YS Zhu,3 G. Eigen,4 I. Ofte,4 B. Stugu,4 GS Abrams,5 AW Borgland,5 AB Breon,5 DN Brown,5 J. Button-Shafer,5 RN Cahn,5 E. Charles,5 CT Day,5 MS Gill,5 AV Gritsan,5 Y. Groysman,5 RG Jacobsen,5 RW Kadel,5 J. Kadyk,5 LT Kerth,5 Yu. G. Kolomensky,5 G. Kukartsev,5 G.

$Research paper thumbnail of Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B→ Kℓ^{+} ℓ^{-} and B→ K^{*} ℓ^{+} ℓ^{-}$

Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B→ Kℓ^{+} ℓ^{-} and B→ K^{*} ℓ^{+} ℓ^{-}

The decays B! K ''ÿ, where ''ÿ is either an e eÿ or ÿ pair and K denotes either a kaon or the K 8... more The decays B! K ''ÿ, where ''ÿ is either an e eÿ or ÿ pair and K denotes either a kaon or the K 892 meson, are manifestations of b! s ''ÿ flavor-changing neutral currents (FCNC). In the standard model (SM), these decays are forbidden at tree level and can only occur at greatly suppressed rates through higherorder processes. At lowest order, three amplitudes contribute:(i) a photon penguin,(ii) a Z penguin, and (iii) a W Wÿ box diagram (Fig. 1).

Hadronic mass moments in inclusive semileptonic B meson decays

We have measured the first and second moments of the hadronic mass-squared distribution in B! Xc ... more We have measured the first and second moments of the hadronic mass-squared distribution in B! Xc n, for Plepton. 1.5 GeVc. We find M2 X 2 M2 D 0.251 6 0.066 GeV2, M2 X 2 M2 X 2 0.576 6 0.170 GeV4, where MD is the spin-averaged D meson mass. From that first moment and the first moment of the photon energy spectrum in b! sg, we find the heavy quark effective theory

Top pair Production Cross section in ATLAS

Page 1. Saleem, M University of Oklahoma Top pair Produc(on Cross sec(on in ATLAS Saleem, M (Univ... more

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$Research paper thumbnail of Study of $ B^ 0 (\ bar {}\ to\ pi^ 0pi^ 0$, $ B^\ pm\ pi^\ pm\ pi^ 0$ and $ B^\ pm\ to K^\ pm\ pi^ 0$ decays$

Study of $ B^ 0 (\ bar {}\ to\ pi^ 0pi^ 0$, $ B^\ pm\ pi^\ pm\ pi^ 0$ and $ B^\ pm\ to K^\ pm\ pi^ 0$ decays

Rare B Decays into States Containing a J/ψ Meson and a Meson with ss [over¯] Quark Content

S, B0! J=, B0! J=, and B0! J= 0 using 56 106 BB events collected at the… 4S† resonance with the B... more

$Research paper thumbnail of Measurement of the Relative Branching Fractions for $ B^-\ to D/D^*/D^{**}(D^{(*)} _ {\ pi})\ ell^-\ bar {\ nu} _ {\ ell} $ with a Large Sample of Tagged B Mesons$

Measurement of the Relative Branching Fractions for $ B^-\ to D/D^*/D^{**}(D^{(*)} _ {\ pi})\ ell^-\ bar {\ nu} _ {\ ell} $ with a Large Sample of Tagged B Mesons

Search for the decay of a B0 or B0bar meson to anti-K* 0 K0 or K* 0 anti-K0

$Research paper thumbnail of Measurement of the masses and widths of the Σ_ {c}^{++} and Σ_ {c}^{0} charmed baryons$

Measurement of the masses and widths of the Σ_ {c}^{++} and Σ_ {c}^{0} charmed baryons

Using data recorded by the CLEO II and CLEO II. V detector configurations at CESR, we report new ... more Using data recorded by the CLEO II and CLEO II. V detector configurations at CESR, we report new measurements of the masses of the c and c 0 charmed baryons, and the first measurements of their intrinsic widths. We find M (c) M (c) 167.40. 10.2 MeV,(c) 2.30. 20.3 MeV, and M (c 0) M (c) 167.20. 10.2 MeV,(c 0) 2.50. 20.3 MeV, where the uncertainties are statistical and systematic, respectively.

$Research paper thumbnail of Study of Time-Dependent CP Asymmetry in Neutral B Decays to J/ψπ^{0}$

Study of Time-Dependent CP Asymmetry in Neutral B Decays to J/ψπ^{0}

We present the first study of the time-dependent CP-violating asymmetry in B0! J= 0 decays using ... more We present the first study of the time-dependent CP-violating asymmetry in B0! J= 0 decays using e eÿ annihilation data collected with the BABAR detector at the 4S resonance during the years 1999–2002 at the PEP-II asymmetric-energy B Factory at SLAC. Using approximately 88 106 BB pairs, our results for the coefficients of the cosine and sine terms of the CP asymmetry are CJ= 0 0: 38 0: 41 stat 0: 09 syst and SJ= 0 0: 05 0: 49 stat 0: 16 syst.

$Research paper thumbnail of Search for CPT and Lorentz Violation in B^{0}-B [over¯]^{0} Oscillations with Dilepton Events$

Search for CPT and Lorentz Violation in B^{0}-B [over¯]^{0} Oscillations with Dilepton Events

We report results of a search for CPT and Lorentz violation in B0-B0 oscillations using inclusive... more We report results of a search for CPT and Lorentz violation in B0-B0 oscillations using inclusive dilepton events from 232 106 4S! BB decays recorded by the BABAR detector at the PEP-II B Factory at SLAC. We find 2: 8 significance, compatible with no signal, for variations in the complex CPT violation parameter z at the Earth's sidereal frequency and extract values for the quantities a in the general Lorentz-violating standard-model extension.

$Research paper thumbnail of Observation of B^{0}→ K^{* 0} K [over¯]^{* 0} and Search for B^{0}→ K^{* 0} K^{* 0}$

Observation of B^{0}→ K^{* 0} K [over¯]^{* 0} and Search for B^{0}→ K^{* 0} K^{* 0}

We report the observation of the b! d penguin-dominated decay B0! K 0 K 0 with a sample of 383: 2... more We report the observation of the b! d penguin-dominated decay B0! K 0 K 0 with a sample of 383: 2 4: 2 million BB pairs collected with the BABAR detector at the PEP-II asymmetric-energy e eÿ collider at the Stanford Linear Accelerator Center. The measured branching fraction is B B0! K 0 K 0 1: 28 0: 35 ÿ0: 30 0: 11 10ÿ6 and the fraction of longitudinal polarization is fL B0! K 0 K 0 0: 80 0: 10 ÿ0: 12 0: 06. The first error quoted is statistical and the second systematic.

$Research paper thumbnail of Amplitude analysis of the decay D^{0}→ K^{-} K^{+} π^{0}$

Amplitude analysis of the decay D^{0}→ K^{-} K^{+} π^{0}

011102-3 to be ÿ35: 5 1: 9 stat 2: 2 syst, and their amplitude ratio to be 0: 599 0: 013 stat 0: ... more 011102-3 to be ÿ35: 5 1: 9 stat 2: 2 syst, and their amplitude ratio to be 0: 599 0: 013 stat 0: 011 syst. We observe contributions from the K and KÿK scalar and vector amplitudes, and analyze their angular moments. We find no evidence for charged, nor for higher spin states. We also perform a partial-wave analysis of the KÿK system in a limited mass range.

$Research paper thumbnail of Study of B→ D^{(*)} D_ {s (J)}^{(*)} decays and measurement of D_ {s}^{-} and D_ {sJ}(2460)^{-} branching fractions$

Study of B→ D^{(*)} D_ {s (J)}^{(*)} decays and measurement of D_ {s}^{-} and D_ {sJ}(2460)^{-} branching fractions

We present branching fraction measurements of 12 B meson decays of the form B! D…† D…† s… J†. The... more We present branching fraction measurements of 12 B meson decays of the form B! D…† D…† s… J†. The results are based on… 4S† decays in BB pairs. One of the B mesons is fully reconstructed and the other decays to two charm mesons, of which one is reconstructed, and the mass and momentum of the other is inferred by kinematics. Combining these results with previous exclusive branching fraction measurements, we determine B… Dÿ s! ÿ† ˆ… 4: 62 0: 36stat: 0: 51syst:†%, B… DsJ… 2460† ÿ!

Measurement of the direct CP asymmetry in b→ sγ decays

We describe a measurement of the direct CP asymmetry between inclusive b! s and b! s decays. This... more

$Research paper thumbnail of Measurement of the branching fraction and the CP-violating asymmetry for the decay B^{0}→ K_ {S}^{0} π^{0}$

Measurement of the branching fraction and the CP-violating asymmetry for the decay B^{0}→ K_ {S}^{0} π^{0}

S [7] and B0! K0 S 0 [8]. Within the SM these asymmetries are expected to be consistent with the ... more S [7] and B0! K0 S 0 [8]. Within the SM these asymmetries are expected to be consistent with the measurement of sin2 in charmonium modes originating from the treelevel b! ccs transition. These comparisons must take into account possible deviations for each mode, within the SM, due to contributions of other diagrams with different phases and rescattering effects. At this point none of the modes above shows a significant deviation from the SM expectation [9].

$Research paper thumbnail of Search for b→ u transitions in B^{-}→ D^{0} K^{-} and B^{-}→ D^{* 0} K^{-}$

Search for b→ u transitions in B^{-}→ D^{0} K^{-} and B^{-}→ D^{* 0} K^{-}

$Research paper thumbnail of Precision measurement of the Λ_ {c}^{+} baryon mass$

Precision measurement of the Λ_ {c}^{+} baryon mass

The invariant masses of the stable charmed hadrons are currently reported by the Particle Data Gr... more The invariant masses of the stable charmed hadrons are currently reported by the Particle Data Group (PDG) with a precision of about 0: 5–0: 6 MeV= c2 [1]. The best individual measurements have a statistical and systematic precision of about 0: 5 MeV= c2 and use data samples of a few hundred events.

$Research paper thumbnail of Search for Lepton Flavor Violating Decays τ^{±}→ ℓ^{±} π^{0}, ℓ^{±} η, ℓ^{±} η^{′}$

Search for Lepton Flavor Violating Decays τ^{±}→ ℓ^{±} π^{0}, ℓ^{±} η, ℓ^{±} η^{′}

A search for lepton flavor violating decays of the lepton to a lighter mass lepton and a pseudosc... more A search for lepton flavor violating decays of the lepton to a lighter mass lepton and a pseudoscalar meson has been performed using 339 fbÿ1 of e eÿ annihilation data collected at a center-of-mass energy near 10.58 GeV by the BABAR detector at the SLAC PEP-II storage ring. No evidence of a signal has been found, and upper limits on the branching fractions are set at the 10ÿ7 level.

$Research paper thumbnail of Measurements of charm fragmentation into D_ {s}^{*+} and D_ {s}^{+} in e^{+} e^{-} annihilations at sqrt [s]= 10.5 GeV$

Measurements of charm fragmentation into D_ {s}^{*+} and D_ {s}^{+} in e^{+} e^{-} annihilations at sqrt [s]= 10.5 GeV

The production cross sections of qq pairs in ee annihilations can be calculated using QCD, but th... more The production cross sections of qq pairs in ee annihilations can be calculated using QCD, but the process of fragmentation whereby hadrons are formed is nonperturbative and phenomenological models are used to describe it. Two properties of hadron production that can be experimentally measured are the hadron momentum distribution and the relative population of available spin states.