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1. Granulomatous hyperinflammatory state induced by dupilumab treatment for eosinophilic esophagitis

Author

Kanak V. Kennedy, MD, Anna Costello, MD, Melissa A. Lerman, MD, PhD, Jon M. Burnham, MD, Aoife Corcoran, MD, Joseph Piccione, DO, Alexandra Grier, MD, PhD, Kathleen Sullivan, MD, PhD, Terri Whitehorn-Brown, MD, Caitlin J. Alexander, MD, Laura S. Finn, MD, Benjamin J. Wilkins, MD, PhD, and Amanda B. Muir, MD

Subjects
Dupilumab, biologics, eosinophilic esophagitis, granuloma, adverse effect, Immunologic diseases. Allergy, RC581-607
Abstract

We present the first case of a dupilumab-induced hyperinflammatory state in the setting of underlying eosinophilic esophagitis characterized by multisystem granulomatous inflammation. Although clinical trial data and subsequent real-world experience support dupilumab as a highly effective therapy for eosinophilic esophagitis, close monitoring for development of adverse symptoms following initiation remains paramount.

Published
2024
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7. QS3: Does Top Surgery Reduce Chest Dusphoria in Trans/Non-binary Adolescents and Young Adults

Author

Daniel C. Sasson, BA, Rachita Sood, MD, Mona Ascha, MD, Jeremy W. Cornelius, MA, Abigail L. Muldoon, MA, Noopur Gangopadhyay, MD, Diane Chen, PhD, Julia F. Corcoran, MD, MHPE, and Sumanas W. Jordan, MD, PhD

Subjects
Surgery, RD1-811
Abstract

Purpose: Top surgery (i.e. mastectomy) has been shown to improve gender dysphoria and quality of life in adult transmasculine patients. However, even as an increasing number of adolescents and young adults present for gender-affirming surgery, the impact of top surgery on this population is not well described. Minor patients require parental consent and often face more stringent insurance restrictions. This prospective study aims to increase the body of evidence for gender-affirming top surgery in adolescents and young adults. We will measure the change in self-reported gender dysphoria, gender congruence, body image, and chest dysphoria. Methods: This is a prospective, multi-institutional study. Transmasculine and non-binary, designated female at birth, patients between the age of 13-25 years presenting for top surgery consultation were recruited from: Northwestern Memorial Hospital, The University of Illinois at Chicago, or Ann & Robert H. Lurie Children’s Hospital of Chicago. Patients completed four patient-reported outcomes measures at three time points: pre-operative baseline, three-months postoperative, and one-year postoperative. The questionnaires employed included the Transgender Congruence Scale (TCS), the Utretcht Gender Dysphoria Scale (UGDS), the Chest Dysphoria Measure (CDM), and the Body Image Scale (BIS). Preliminary interim analysis of mean change scores between pre- and three-month postoperative surveys was performed using paired, two-sided t-tests with confidence level at 95%. Results: Thirty nine patients have been enrolled to date. At interim analysis, ten patients, mean age 18.6±2.9, range 15-24 years, had completed 3-month follow-up. Eight identified as transmasculine, one non-binary/genderqueer, and one identified as ‘other.’ Mean change from baseline to three-months of the TCS appearance congruence sub-scale was 7.3 points (p = 0.002), mean change of the internal congruence sub-scale was 0.1 points (p = 0.859), and total score scale was 7.4 points (p = 0.002). The UGDS demonstrated a mean change of -2.1 points at three-months (p = 0.099). The Chest Dysphoria Measure demonstrated mean change of -28.3 points at three-months (p < 0.001). The BIS total score mean change was -12.3 points at three-months (p = 0.011). Among the BIS subscales, the primary sexual characteristics score had a mean change of -5.5 points (p=0.003), secondary sexual characteristics had a mean change of -4.0 points (p = 0.047) and neutral characteristics had a mean change of -1.6 points (p = 0.259) at three months. Conclusion: Our preliminary findings demonstrate that gender-affirming chest surgery improves chest dysphoria, appearance congruence, and overall gender congruence in transmasculine and non-binary adolescents and young adults. We anticipate that the final data will inform clinical practice guidelines for transgender and non-binary patients seeking mastectomy and chest masculinization.

Published
2021
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8. Patient Perspectives on Telepsychiatry on the Inpatient Psychiatric Unit During the COVID-19 Pandemic

Author

Reuben Heyman-Kantor MD, Nathan Hardy MD, and Amy R Corcoran MD

Subjects
Medicine (General), R5-920
Abstract

Hospitals have eliminated many in-person interactions and established new protocols to stem the spread of COVID-19. Inpatient psychiatric units face unique challenges, as patients cannot be isolated in their rooms and are at times unable to practice social distancing measures. Many institutions have experimented with providing some psychiatric services remotely to reduce the number of people physically present on the wards and decrease the risk of disease transmission. This case report presents 2 patient perspectives on receiving psychiatric care via videoconferencing while on the inpatient unit of a large academic tertiary care hospital. One patient identified some benefits to virtual treatment while the second found the experience impersonal; both were satisfied with the overall quality of care they received and were stable 2 weeks after discharge. These cases demonstrate that effective care can be provided remotely even to severely ill psychiatric patients who require hospitalization.

Published
2020
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9. Observation of Direct CP Violation in KS,L→ππ Decays

Author

Alavi-Harati, A, Albuquerque, IF, Alexopoulos, T, Arenton, M, Arisaka, K, Averitte, S, Barker, AR, Bellantoni, L, Bellavance, A, Belz, J, Ben-David, R, Bergman, DR, Blucher, E, Bock, GJ, Bown, C, Bright, S, Cheu, E, Childress, S, Coleman, R, Corcoran, MD, Corti, G, Cox, B, Crisler, MB, Erwin, AR, Ford, R, Glazov, A, Golossanov, A, Graham, G, Graham, J, Hagan, K, Halkiadakis, E, Hanagaki, K, Hidaka, S, Hsiung, YB, Jejer, V, Jennings, J, Jensen, DA, Kessler, R, Kobrak, HGE, LaDue, J, Lath, A, Ledovskoy, A, McBride, PL, McManus, AP, Mikelsons, P, Monnier, E, Nakaya, T, Nauenberg, U, Nelson, KS, Nguyen, H, O'Dell, V, Pang, M, Pordes, R, Prasad, V, Qiao, C, Quinn, B, Ramberg, EJ, Ray, RE, Roodman, A, Sadamoto, M, Schnetzer, S, Senyo, K, Shanahan, P, Shawhan, PS, Slater, W, Solomey, N, Somalwar, SV, Stone, RL, Suzuki, I, Swallow, EC, Swanson, RA, Taegar, SA, Tesarek, RJ, Thomson, GB, Toale, PA, Tripathi, A, Tschirhart, R, Wah, YW, Wang, J, White, HB, Whitmore, J, Winstein, B, Winston, R, Wu, J-Y, Yamanaka, T, and Zimmerman, ED

Subjects
Perinatal Period - Conditions Originating in Perinatal Period, Pediatric, Mathematical Sciences, Physical Sciences, Engineering, General Physics
Abstract

We have compared the decay rates of KL and KS toΠ+ Π- Π0Π0 final states using a subset of the data from the KTeV experiment (E832) at Fermilab. We find that the direct-CP-violation parameter Re (μ’/μ) is equal to [28.0±3.0(stat)±2.8(syst)]×10-4. This result definitively establishes the existence of CP violation in a decay process. © 1999 The American Physical Society.

Published
1999

10. Observation of direct CP violation in ks, l→ΠΠ decays

Author

Alavi-Harati, A, Albuquerque, IF, Alexopoulos, T, Arenton, M, Arisaka, K, Averitte, S, Barker, AR, Bellantoni, L, Bellavance, A, Belz, J, Ben David, R, Bergman, DR, Blucher, E, Bock, GJ, Bown, C, Bright, S, Cheu, E, Childress, S, Coleman, R, Corcoran, MD, Corti, G, Cox, B, Crisler, MB, Erwin, AR, Ford, R, Glazov, A, Golossanov, A, Graham, G, Graham, J, Hagan, K, Halkiadakis, E, Hanagaki, K, Hidaka, S, Hsiung, YB, Jejer, V, Jennings, J, Jensen, DA, Kessler, R, Kobrak, HGE, La Due, J, Lath, A, Ledovskoy, A, Mc Bride, PL, Mc Manus, AP, Mikelsons, P, Monnier, E, Nakaya, T, Nauenberg, U, Nelson, KS, Nguyen, H, O’dell, V, Pang, M, Pordes, R, Prasad, V, Qiao, C, Quinn, B, Ramberg, EJ, Ray, RE, Roodman, A, Sadamoto, M, Schnetzer, S, Senyo, K, Shanahan, P, Shawhan, PS, Slater, W, Solomey, N, Somalwar, SV, Stone, RL, Suzuki, I, Swallow, EC, Swanson, RA, Taegar, SA, Tesarek, RJ, Thomson, GB, Toale, PA, Tripathi, A, Tschirhart, R, Wah, YW, Wang, J, White, HB, Whitmore, J, Winstein, B, Winston, R, Wu, JY, Yamanaka, T, and Zimmerman, ED

Subjects
Pediatric, Perinatal Period - Conditions Originating in Perinatal Period, General Physics, Physical Sciences, Mathematical Sciences, Engineering
Abstract

We have compared the decay rates of KL and KS toΠ+ Π- Π0Π0 final states using a subset of the data from the KTeV experiment (E832) at Fermilab. We find that the direct-CP-violation parameter Re (μ’/μ) is equal to [28.0±3.0(stat)±2.8(syst)]×10-4. This result definitively establishes the existence of CP violation in a decay process. © 1999 The American Physical Society.

Published
1999

12. Precise Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System

Author

Collaboration, K, Abouzaid, E, Arenton, M, Barker, A, Barrio, M, Bellantoni, L, Blucher, E, Bock, G, Bown, C, Cheu, E, Coleman, R, Corcoran, MD, Cox, B, Erwin, A, Escobar, C, Glazov, A, Golossanov, A, Gomes, R, Gouffon, P, Graham, J, Hamm, J, Hsiung, Y, Jensen, D, Kessler, R, and Kotera, K

Abstract

We present precise tests of CP and CPT symmetry based on the full dataset of K to pipi decays collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999. This dataset contains 16 million K to 2pi0 and 69 million K to pi+pi- decays. We measure the direct CP violation parameter Re(epsilon'/epsilon) = (19.2 pm 2.1)x10-4. We find the KL-KS mass difference Deltam = (5270 pm 12)x10^6 hbar/s and the KS lifetime tauS = (89.62 pm 0.05)x10-12 s. We also measure several parameters that test CPT invariance. We find the difference between the phase of the indirect CP violation parameter, epsilon, and the superweak phase, phi_epsilon - phi_SW = (0.40 pm 0.56) degrees. We measure the difference of the relative phases between the CP violating and CP conserving decay amplitudes for K to pi+pi- (phi+-) and for K to 2pi0 (phi00), Delta phi = (0.30 pm 0.35) degrees. From these phase measurements, we place a limit on the mass difference between K0 and K0bar, DeltaM < 4.8 x 10-19 GeV/c^2 at 95% C.L. These results are consistent with those of other experiments, our own earlier measurements, and CPT symmetry.

Published
2016
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13. Precise Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System

Author

Collaboration, K, Abouzaid, E, Arenton, M, Barker, AR, Barrio, M, Bellantoni, L, Blucher, E, Bock, GJ, Bown, C, Cheu, E, Coleman, R, Corcoran, MD, Cox, B, Erwin, AR, Escobar, CO, Glazov, A, Golossanov, A, Gomes, RA, Gouffon, P, Graham, J, Hamm, J, Hsiung, YB, Jensen, DA, Kessler, R, Kotera, K, LaDue, J, Ledovskoy, A, McBride, PL, Monnier, E, Nguyen, H, Niclasen, R, II, DGP, Prasad, V, Qi, XR, Ramberg, EJ, Ray, RE, Ronquest, M, Roodman, A, Santos, E, Shanahan, P, Shawhan, PS, Slater, W, Smith, D, Solomey, N, Swallow, EC, Taegar, SA, Toale, PA, Tschirhart, R, Wah, YW, Wang, J, White, HB, Whitmore, J, Wilking, MJ, Winstein, B, Winston, R, Worcester, ET, Yamanaka, T, Zimmerman, ED, and Zukanovich, RF

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics - Experiment
Abstract

We present precise tests of CP and CPT symmetry based on the full dataset of K to pipi decays collected by the KTeV experiment at Fermi National Accelerator Laboratory during 1996, 1997, and 1999. This dataset contains 16 million K to 2pi0 and 69 million K to pi+pi- decays. We measure the direct CP violation parameter Re(epsilon'/epsilon) = (19.2 pm 2.1)x10-4. We find the KL-KS mass difference Deltam = (5270 pm 12)x10^6 hbar/s and the KS lifetime tauS = (89.62 pm 0.05)x10-12 s. We also measure several parameters that test CPT invariance. We find the difference between the phase of the indirect CP violation parameter, epsilon, and the superweak phase, phi_epsilon - phi_SW = (0.40 pm 0.56) degrees. We measure the difference of the relative phases between the CP violating and CP conserving decay amplitudes for K to pi+pi- (phi+-) and for K to 2pi0 (phi00), Delta phi = (0.30 pm 0.35) degrees. From these phase measurements, we place a limit on the mass difference between K0 and K0bar, DeltaM < 4.8 x 10-19 GeV/c^2 at 95% C.L. These results are consistent with those of other experiments, our own earlier measurements, and CPT symmetry., 28 pages, 30 figures; removed extra figure

Published
2010

14. ANALYZING POWER MEASUREMENT IN INCLUSIVE LAMBDA(0) PRODUCTION WITH A 200 GEV/C POLARIZED PROTON-BEAM

Author

BRAVAR A, ADAMS DL, AKCHURIN N, BELIKOV NI, BONNER BE, BYSTRICKY J, CORCORAN MD, COSSAIRT JD, CRANSHAW J, DEREVSCHIKOV AA, ENYO H, FUNAHASHI H, GOTO Y, GRACHOV OA, GROSNICK DP, HILL DA, IIJIMA T, IMAI K, ITOW Y, IWATANI K, KRUEGER K, KURODA K, LAGHAI M, LANGLAND JL, LEHAR F, DELESQUEN A, LOPIANO D, LUEHRING FC, MAKI T, MAKINO T, MAKINO S, MASAIKE A, MATULENKO YA, MESCHANIN AP, MICHALOWICZ A, MILLER DH, MIYAKE K, NAGAMINE T, NESSI TEDALDI F, NESSI M, NGUYEN C, NURUSHEV SB, OHASHI Y, ONEL Y, PATALAKHA DI, PAULETTA G, PENZO A, RAPPAZZO GF, READ AL, ROBERTS JB, VANROSSUM L, RYKOV VL, SAITO N, SALVATO G, SCHIAVON P, SKEENS J, SOLOVYANOV VL, SPINKA H, STANEK RW, TAKASHIMA T, TAKEUTCHI F, UNDERWOOD DG, VASILIEV AN, WHITE JL, YAMASHITA S, YOKOSAWA A, YOSHIDA T, and ZANETTI A

Subjects
MODEL, 18.5 GEV/C, ASYMMETRY, High Energy Physics::Experiment, Nuclear Experiment, HADRON-PRODUCTION, HYPERON POLARIZATION, HIGH-ENERGIES
Abstract

The considerable polarization of hyperons produced at high x(F) has been known for a long time and has been interpreted with various theoretical models in terms of the constituents' spin. Recently, the analyzing power in inclusive Lambda(0) hyperon production has also been measured using the 200 GeV/c Fermilab polarized proton beam. The covered kinematic range is 0.2 less than or equal to x(F) less than or equal to 1.0 and 0.1 less than or equal to p(T) less than or equal to 1.5 GeV/c. The data indicate a negative asymmetry at large x(F) and moderate p(T). These results can further test the current ideas on the underlying mechanisms for hyperon polarization.

Published
1995
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15. Search for the rare decays K(L)→π0π0μ+μ- and K(L)→π0π0X0→π0π0μ+μ-.

Author

Abouzaid E, Arenton M, Barker AR, Bellantoni L, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hsiung YB, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nguyen H, Niclasen R, Phillips DG 2nd, Ping H, Ramberg EJ, Ray RE, Ronquest M, Santos E, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking MJ, Winston R, Worcester ET, Worcester M, Yamanaka T, Zimmerman ED, and Zukanovich RF

Abstract

The KTeV E799 experiment has conducted a search for the rare decays, K(L)→π(0)π(0)μ(+)μ(-) and K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-), where the X(0) is a possible new neutral boson that was reported by the HyperCP experiment with a mass of (214.3 ± 0.5) MeV/c(2). We find no evidence for either decay. We obtain upper limits of Br(K(L)→π(0)π(0)X(0)→π(0)π(0)μ(+)μ(-)) < 1.0 × 10(-10) and Br(K(L)→π(0)π(0)μ(+)μ(-)) < 9.2 × 10(-11) at the 90% confidence level. This result rules out the pseudoscalar X(0) as an explanation of the HyperCP result under the scenario that the dsX(0) coupling is completely real.

Published
2011
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16. Determination of the parity of the neutral pion via its four-electron decay.

Author

Abouzaid E, Arenton M, Barker AR, Bellantoni L, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hsiung YB, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nguyen H, Niclasen R, Phillips DG 2nd, Ramberg EJ, Ray RE, Ronquest M, Santos E, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking MJ, Winstein B, Winston R, Worcester ET, Yamanaka T, Zimmerman ED, and Zukanovich RF

Abstract

We present a new determination of the parity of the neutral pion via the double Dalitz decay pi0-->e+e-e+e-. Our sample, which consists of 30,511 candidate decays, was collected from KL-->pi0pi0pi0 decays in flight at the KTeV-E799 experiment at Fermi National Accelerator Laboratory. We confirm the negative pi0 parity and place a limit on scalar contributions to the pi0-->e+e-e+e- decay amplitude of less than 3.3% assuming CPT conservation. The pi0gamma*gamma* form factor is well described by a momentum-dependent model with a slope parameter fit to the final state phase-space distribution. Additionally, we have measured the branching ratio of this mode to be B(pi0-->e+e-e+e-)=(3.26+/-0.18)x10(-5).

Published
2008
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17. Search for lepton-flavor-violating decays of the neutral kaon.

Author

Abouzaid E, Arenton M, Barker AR, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hsiung YB, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nguyen H, Niclasen R, Ii DG, Ping H, Ramberg EJ, Ray RE, Ronquest M, Santos E, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking MJ, Winstein B, Winston R, Wolfe C, Worcester ET, Worcester M, Yamanaka T, Zimmerman ED, and Zukanovich RF

Abstract

The Fermilab KTeV experiment has searched for lepton-flavor-violating decays of the K(L) meson in three decay modes. We observe no events in the signal region for any of the modes studied, and we set the following upper limits for their branching ratios at the 90% C.L.: BR(K(L) --> pi(0) micro(+/-) e(-/+)) <7.6 x 10(-11); BR(K(L) --> pi(0)pi(0) micro(+/-) e(-/+)) <1.7 x 10(-10); BR(pi(0) --> micro(+/-) e(-/+)) <3.6 x 10(-10). This result represents a factor of 82 improvement in the branching ratio limit for K(L) --> pi(0) micro(+/-) e(-/+) and is the first reported limit for K(L) --> pi(0)pi(0) micro(+/-) e(-/+).

Published
2008
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18. First observation of K{L}-->pi{+/-}e{-/+}nue{+}e{-}.

Author

Abouzaid E, Arenton M, Barker AR, Bellantoni L, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hsiung YB, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Niclasen R, Phillips DG 2nd, Ping H, Ramberg EJ, Ray RE, Ronquest M, Santos E, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking MJ, Winstein B, Winston R, Worcester ET, Worcester M, Yamanaka T, Zimmerman ED, and Zukanovich RF

Abstract

This Letter is the first report of the K{L}-->pi{+/-}e{-/+}nue{+}e{-} decay. Based on 19 208+/-144 events, we determine the branching fraction, B(K{L}-->pi{+/-}e{-/+}nue{+}e{-}M&#95;{e{+}e{-}}>5 MeV/c{2},E{e{+}e{-}}{*}>30 MeV)=(1.285+/-0.041)x10{-5}, and Gamma(K{e3ee}M{e{+}e{-}}>5 MeV/c{2})/Gamma(K{e3})=[4.57+/-0.04(stat)+/-0.14(syst)]x10{-5}. This ratio agrees with a theoretical prediction based on chiral perturbation theory (ChPT) calculated to O(p{4}). The measured kinematical distributions agree with those predicted by just ChPT O(p{4}), but show significant disagreement with ones predicted by leading-order ChPT.

Published
2007
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19. Measurements of the decay KL-->e+ e- gamma.

Author

Abouzaid E, Arenton M, Barker AR, Bellantoni L, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Glazov A, Golossanov A, Hsiung YB, Jensen DA, Kessler R, Kobrak HG, Kotera K, LaDue J, Ledovskoy A, McBride PL, Monnier E, Nguyen H, Niclasen R, Ramberg EJ, Ray RE, Ronquest M, Shields J, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking MJ, Winston R, Worcester ET, Yamanaka T, and Zimmerman ED

Abstract

The E799-II (KTeV) experiment at Fermilab has collected 83 262 K(L)-->e+ e- gamma(gamma) events above a background of 79 events. We measure a decay width, normalized to the K(L)-->pi0pi0pi(D)0 (pi0-->gammagamma, pi0-->gammagamma, pi(D0-->e+ e- gamma(gamma)) decay width, of Gamma(K(L)-->e+e-gamma(gamma))/Gamma(K(L)-->pi0pi0pi(D)0)=(1.3302+/-0.0046(stat)+/-0.0102(syst)) x 10(-3). We also measure parameters of two K(L)gamma*gamma form factor models. In the Bergström-Massó-Singer parametrization, we find Calpha(K*)= -0.517 +/- 0.030(stat) +/- 0.022(syst). We separately fit for the first parameter of the D'Ambrosio-Isidori-Portolés model and find alpha(DIP)= -1.729 +/- 0.043(stat) +/- 0.028(syst).

Published
2007
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20. Measurement of the K0 charge radius and a CP-violating asymmetry and a search for CP-violating E1 direct photon emission in the rare decay KL--> pi+ pi- e+ e-.

Author

Abouzaid E, Arenton M, Barker AR, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Corti G, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hanagaki K, Hsiung YB, Huang H, Jensen DA, Kessler R, Kotera K, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Niclasen R, Ping H, Qi XR, Ramberg EJ, Ray RE, Ronquest M, Santos E, Shields J, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worchester ET, Worchester M, Yamanaka T, Zimmerman ED, and Zukanovich RF

Abstract

Using the complete KTeV data set of 5,241 candidate K(L)--> pi(+) pi(-) e(+) e(-) decays (including an estimated background of 204 +/- 14 events), we have measured the coupling g(CR)= 0.163 +/- 0.0149(stat) +/- 0.023(syst) of the CP conserving charge radius process and from it determined a K(0) charge radius of = [-0.077 +/- 0.007(stat) +/- 0.011(syst)]fm(2). We have determined a first experimental upper limit of 0.04 (90% C.L.) /g(e1)/ / /g(M1)/ of the couplings for the E1 and M1 direct photon emission processes. We also report the measurement of /g(M1)/ including a vector form factor /g(M1)/(1 + (a(1)/a(2))/((M(2)(p)-(M(2)(k))= 2M(K)E(gamma*)), where vector /g(M1)/= 1.11+/- 0.12(stat) +/- 0.08(syst) and a(1)/a(2) = [-0.744 +/- 0.027(stat) +/- 0.032(syst)] GeV(2)/c(2). Finally, a CP-violating asymmetry of [13.6 +/- 1.4(stat) +/- 1.5(syst)]% in the CP and T odd angle phi between the decay planes of the e(+) e(-) and pi(+) pi(-) pairs in the K(L) center of mass is reported.

Published
2006
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21. Observation of the decay xi0 --> sigma+ mu- nu(mu).

Author

Abouzaid E, Alexopoulos T, Arenton M, Barbosa RF, Barker AR, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Glazov A, Golossanov A, Gomes RA, Gouffon P, Hanagaki K, Hsiung YB, Huang H, Jensen DA, Kessler R, Kotera K, LaDue J, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Niclasen R, Ping H, Prasad V, Qi XR, Ramberg EJ, Ray RE, Ronquest M, Santos E, Shields J, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worcester ET, Worcester M, Yamanaka T, Zimmerman ED, and Zukanovich RF

Abstract

The xi0 muon semileptonic decay has been observed for the first time with nine identified events using the KTeV beam line and detector at Fermilab. The decay is normalized to the xi0 beta decay mode and yields a value for the ratio of decay rates gamma(xi0 --> sigma+ mu- nu(mu))/gamma(xi0 --> sigma+ e- nu(e)) of [1.8(-0.5)(+0.7)(stat) +/- 0.2(syst)] x 10(-2). This is in agreement with the SU(3) flavor symmetric quark model.

Published
2005
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22. A determination of the Cabibbo-Kobayashi-Maskawa parameter |V us| using KL decays.

Author

Alexopoulos T, Arenton M, Barbosa RF, Barker AR, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Cheu E, Childress S, Coleman R, Corcoran MD, Cox B, Erwin AR, Ford R, Glazov A, Golossanov A, Graham J, Hamm J, Hanagaki K, Hsiung YB, Huang H, Jejer V, Jensen DA, Kessler R, Kobrak HG, Kotera K, LaDue J, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Niclasen R, Prasad V, Qi XR, Ramberg EJ, Ray RE, Ronquest M, Santos E, Shanahan P, Shields J, Slater W, Smith D, Solomey N, Swallow EC, Toale PA, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worcester ET, Yamanaka T, and Zimmerman ED

Abstract

We present a determination of the Cabibbo-Kobayashi-Maskawa parameter |V(us)| based on new measurements of the six largest K(L) branching fractions and semileptonic form factors by the KTeV (E832) experiment at Fermilab. We find |V(us)|=0.2252+/-0.0008(KTeV)+/-0.0021(ext), where the errors are from KTeV measurements and from external sources. We also use the measured branching fractions to determine the CP violation parameter |eta(+-)|=(2.228+/-0.005(KTeV)+/-0.009(ext))x10(-3).

Published
2004
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23. Search for the rare decay K(L)-->pi(0)e(+)e(-).

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Barbosa RF, Barker AR, Barrio M, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Ford R, Glazov A, Golossanov A, Gomes RA, Gouffon P, Graham J, Hamm J, Hanagaki K, Hsiung YB, Huang H, Jejer V, Jensen DA, Kessler R, Kobrak HG, Kotera K, LaDue J, Lai N, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Ping H, Prasad V, Qi XR, Quinn B, Ramberg EJ, Ray RE, Ronquest M, Santos E, Senyo K, Shanahan P, Shields J, Slater W, Smith DE, Solomey N, Swallow EC, Taegar SA, Tesarek RJ, Toale PA, Tschirhart R, Velissaris C, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worcester ET, Yamanaka T, and Zukanovich RF

Abstract

The KTeV/E799 experiment at Fermilab has searched for the rare kaon decay K(L)-->pi(0)e(+)e(-). This mode is expected to have a significant CP violating component. The measurement of its branching ratio could support the standard model or could indicate the existence of new physics. This Letter reports new results from the 1999-2000 data set. One event is observed with an expected background at 0.99+/-0.35 events. We set a limit on the branching ratio of 3.5x10(-10) at the 90% confidence level. Combining with the previous result based on the data set taken in 1997 yields the final KTeV result: BR(K(L)-->pi(0)e(+)e(-))<2.8x10(-10) at 90% C.L.

Published
2004
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24. Measurements of the Decay KL-->e+ e- mu+ mu-.

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Barbosa RF, Barker AR, Barrio M, Bellantoni L, Bellavance A, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Coleman R, Corcoran MD, Cox B, Erwin AR, Escobar CO, Ford R, Glazov A, Golossanov A, Gouffon P, Graham J, Hamm J, Hanagaki K, Hsiung YB, Huang H, Jejer V, Jensen DA, Kessler R, Kobrak HG, Kotera K, LaDue J, Lai N, Ledovskoy A, McBride PL, Monnier E, Nelson KS, Nguyen H, Prasad V, Qi XR, Quinn B, Ramberg EJ, Ray RE, Santos E, Senyo K, Shanahan P, Shields J, Slater W, Solomey N, Swallow EC, Taegar SA, Tesarek RJ, Toale PA, Tripathi A, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Wilking M, Winstein B, Winston R, Worcester ET, Yamanaka T, and Zukanovich RF

Abstract

The KTeV experiment at Fermilab has isolated a total of 132 events from the rare decay K(L)-->e+ e- mu+ mu-, with an estimated background of 0.8 events. The branching ratio of this mode is determined to be [2.69+/-0.24(stat)+/-0.12(syst)]x10(-9), with a radiative cutoff of M(2)(ee mu mu)/M(2)(K)>0.95. The first measurement using this mode of the parameter alpha from the D'Ambrosio-Isidori-Portolès (DIP) model of the K(L)gamma*gamma* vertex yields a result of -1.59+/-0.37, consistent with values obtained from other decay modes. Because of the limited statistics, no sensitivity is found to the DIP parameter beta. We use this decay mode to set limits on CP and lepton violation.

Published
2003
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25. Search for the KL-->pi 0 pi 0 e+e- decay in the KTeV experiment.

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barbosa RF, Barker AR, Barrio M, Bellantoni L, Bellavance A, Belz J, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Erwin AR, Ford R, Glazov A, Golossanov A, Graham G, Graham J, Halkiadakis E, Hamm J, Hanagaki K, Hidaka S, Hsiung YB, Jejer V, Jensen DA, Kessler R, Kobrak HG, LaDue J, Lath A, Ledovskoy A, McBride PL, Mikelsons P, Monnier E, Nakaya T, Nelson KS, Nguyen H, O'Dell V, Pordes R, Prasad V, Qi XR, Quinn B, Ramberg EJ, Ray RE, Roodman A, Schnetzer S, Senyo K, Shanahan P, Shawhan PS, Shields J, Slater W, Solomey N, Somalwar SV, Stone RL, Swallow EC, Taegar SA, Tesarek RJ, Thomson GB, Toale PA, Tripathi A, Tschirhart R, Turner SE, Wah YW, Wang J, White HB, Whitmore J, Winstein B, Winston R, Yamanaka T, and Zimmerman ED

Abstract

The recent discovery of a large CP violating asymmetry in KL-->pi+pi-e+e- mode has prompted us to seach for the associated KL-->pi 0 pi 0 e+e- decay mode in the KTeV-E799 experiment at Fermilab. In 2.7 x 10(11) K(L) decays, one candidate event has been observed with an expected background of 0.3 event, resulting in an upper limit for the KL-->pi 0 pi 0 e+e- branching ratio of 6.6 x 10(-9) at the 90% C.L.

Published
2002
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26. Radiative decay width measurements of neutral kaon excitations using the primakoff effect.

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barbosa RF, Barker AR, Barrio M, Bellantoni L, Bellavance A, Belz J, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Cunha A, Erwin AR, Ford R, Glazov A, Golossanov A, Graham G, Graham J, Halkiadakis E, Hamm J, Hanagaki K, Hidaka S, Hsiung YB, Jejer V, Jensen DA, Kessler R, Kobrak HG, LaDue J, Lath A, Ledovskoy A, McBride PL, Medvigy D, Mikelsons P, Monnier E, Nakaya T, Nelson KS, Nguyen H, O'Dell V, Pordes R, Prasad V, Qi XR, Quinn B, Ramberg EJ, Ray RE, Roodman A, Schnetzer S, Senyo K, Shanahan P, Shawhan PS, Shields J, Slater W, Solomey N, Somalwar SV, Stone RL, Swallow EC, Taegar SA, Tesarek RJ, Thomson GB, Toale PA, Tripathi A, Tschirhart R, Turner SE, Wah YW, Wang J, White HB, Whitmore J, Winstein B, Winston R, Yamanaka T, and Zimmerman ED

Abstract

We use K(L)'s in the 100-200 GeV energy range to produce 147 candidate events of the axial vector pair K1(1270)-K1(1400) in the nuclear Coulomb field of a Pb target and determine the radiative widths Gamma(K1(1400)-->K0+gamma)=280.8+/-23.2(stat)+/-40.4(syst) keV and Gamma(K1(1270)-->K0+gamma)=73.2+/-6.1(stat)+/-28.3(syst) keV. These first measurements appear to be lower than the quark-model predictions. We also place upper limits on the radiative widths for K(*)(1410) and K(*)(2)(1430) and find that the latter is vanishingly small in accord with SU(3) invariance in the naive quark model.

Published
2002
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27. Measurement of the K(L) charge asymmetry.

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barbosa RF, Barker AR, Barrio M, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, Glazov A, Golossanov A, Graham G, Graham J, Hagan K, Halkiadakis E, Hamm J, Hanagaki K, Hidaka S, Hsiung YB, Jejer V, Jensen DA, Kessler R, Kobrak HG, LaDue J, Lath A, Ledovskoy A, McBride PL, Mikelsons P, Monnier E, Nakaya T, Nelson KS, Nguyen H, O'Dell V, Pang M, Pordes R, Prasad V, Qi XR, Quinn B, Ramberg EJ, Ray RE, Roodman A, Sadamoto M, Schnetzer S, Senyo K, Shanahan P, Shawhan PS, Shields J, Slater W, Solomey N, Somalwar SV, Stone RL, Swallow EC, Taegar SA, Tesarek RJ, Thomson GB, Toale PA, Tripathi A, Tschirhart R, Turner SE, Wah YW, Wang J, White HB, Whitmore J, Winstein B, Winston R, Yamanaka T, and Zimmerman ED

Abstract

We present a measurement of the charge asymmetry delta(L) in the mode K(L)-->pi(+/-)e(-/+)nu based on 298 x 10(6) analyzed decays. We measure a value of delta(L) = [3322+/-58(stat)+/-47(syst)]x10(-6), in good agreement with previous measurements and 2.4 times more precise than the current best published result. The result is used to place more stringent limits on CPT and DeltaS = DeltaQ violation in the neutral kaon system.

Published
2002
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28. First measurement of form factors of the decay Xi(0) --> Sigma(+)e(-)nu macro(e).

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barbosa RF, Barker AR, Barrio M, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, Glazov A, Golossanov A, Graham G, Graham J, Hagan K, Halkiadakis E, Hamm J, Hanagaki K, Hidaka S, Hsiung YB, Jejer V, Jensen DA, Kessler R, Kobrak HG, LaDue J, Lath A, Ledovskoy A, McBride PL, Mikelsons P, Monnier E, Nakaya T, Nelson KS, Nguyen H, O'Dell V, Pang M, Pordes R, Prasad V, Qi XR, Quinn B, Ramberg EJ, Ray RE, Roodman A, Sadamoto M, Schnetzer S, Senyo K, Shanahan P, Shawhan PS, Shields J, Slater W, Solomey N, Somalwar SV, Stone RL, Swallow EC, Taegar SA, Tesarek RJ, Thomson GB, Toale PA, Tripathi A, Tschirhart R, Turner SE, Wah YW, Wang J, White HB, Whitmore J, Winstein B, Winston R, Yamanaka T, and Zimmerman ED

Abstract

We present the first measurement of the form factor ratios g(1)/f(1) (direct axial vector to vector), g(2)/f(1) (second class current), and f(2)/f(1) (weak magnetism) for the decay Xi(0)-->Sigma(+)e(-)nu macro(e) using the KTeV (E799) beam line and detector at Fermilab. From the Sigma(+) polarization measured with the decay Sigma(+)-->p pi(0) and the e(-)-nu; correlation, we measure g(1)/f(1) to be 1.32+/-(0.21)(0.17)(stat)+/-0.05(syst), assuming the SU(3)(f) (flavor) values for g(2)/f(1) and f(2)/f(1). Our results are all consistent with exact SU(3)(f) symmetry.

Published
2001
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29. Branching ratio measurement of the decay K(L) --> e(+)e(-)mu(+)mu(-).

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barbosa RF, Barker AR, Barrio M, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, Glazov A, Golossanov A, Graham G, Graham J, Hagan K, Halkiadakis E, Hamm J, Hanagaki K, Hidaka S, Hsiung YB, Jejer V, Jensen DA, Kessler R, Kobrak HG, LaDue J, Lath A, Ledovskoy A, McBride PL, Mikelsons P, Monnier E, Nakaya T, Nelson KS, Nguyen H, O'Dell V, Pang M, Pordes R, Prasad V, Quinn B, Qi XR, Ramberg EJ, Ray RE, Roodman A, Sadamoto M, Schnetzer S, Senyo K, Shanahan P, Shawhan PS, Shields J, Slater W, Solomey N, Somalwar SV, Stone RL, Swallow EC, Taegar SA, Tesarek RJ, Thomson GB, Toale PA, Tripathi A, Tschirhart R, Turner SE, Wah YW, Wang J, White HB, Whitmore J, Winstein B, Winston R, Yamanaka T, and Zimmerman ED

Abstract

We have collected a 43 event sample of the decay K(L)-->e(+)e(-)mu(+)mu(-) with negligible backgrounds and measured its branching ratio to be (2.62+/-0.40+/-0.17)x10(-9). We see no evidence for CP violation in this decay. In addition, we set the 90% confidence upper limit on the combined branching ratios for the lepton flavor violating decays K(L)-->e(+/-)e(+/-)mu(-/+)mu(-/+) at B(K(L)-->e(+/-)e(+/-)mu(-/+)mu(-/+))< or =1.23x10(-10), assuming a uniform phase space distribution.

Published
2001
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30. Measurement of the branching ratio and form factor of K(L)-->mu(+)mu(-)gamma.

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barker AR, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, Glazov A, Golossanov A, Graham G, Graham J, Hagan K, Halkiadakis E, Hamm J, Hanagaki K, Hidaka S, Hsiung YB, Jejer V, Jensen DA, Kessler R, Kobrak HG, LaDue J, Lath A, Ledovskoy A, McBride PL, Mikelsons P, Monnier E, Nakaya T, Nelson KS, Nguyen H, O'Dell V, Pang M, Pordes R, Prasad V, Quinn B, Ramberg EJ, Ray RE, Roodman A, Sadamoto M, Schnetzer S, Senyo K, Shanahan P, Shawhan PS, Shields J, Slater W, Solomey N, Somalwar SV, Stone RL, Swallow EC, Taegar SA, Tesarek RJ, Thomson GB, Toale PA, Tripathi A, Tschirhart R, Turner SE, Wah YW, Wang J, White HB, Whitmore J, Winstein B, Winston R, Yamanaka T, and Zimmerman ED

Abstract

We report on the analysis of the rare decay K(L)-->mu(+)mu(-)gamma the 1997 data from the KTeV experiment at Fermilab. A total of 9327 candidate events are observed with 2.4% background, representing a factor of 40 increase in statistics over the current world sample. We find that B(K(L)-->mu(+)mu(-)gamma) = (3.62 +/- 0.04(stat) +/- 0.08(syst)) x 10(-7). The form factor parameter alpha(K*) is measured to be alpha(K*) = -0.160(+0.026)(-0.028). In addition, we make the first measurement of the parameter alpha from the D'Ambrosio-Isidori-Portolés form factor, finding alpha = -1.54 +/- 0.10. In that model, this alpha measurement limits the Cabibbo-Kobayashi-Maskawa parameter rho>-0.2.

Published
2001
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31. Measurements of the rare decay K(L) --> e(+)e(-)e(+)e(-).

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barker AR, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, Glazov A, Golossanov A, Graham G, Graham J, Hagan K, Halkiadakis E, Hamm J, Hanagaki K, Hidaka S, Hsiung YB, Jejer V, Jensen DA, Kessler R, Kobrak HG, LaDue J, Lath A, Ledovskoy A, McBride PL, Mikelsons P, Monnier E, Nakaya T, Nelson KS, Nguyen H, O'Dell V, Pang M, Pordes R, Prasad V, Quinn B, Ramberg EJ, Ray RE, Roodman A, Sadamoto M, Schnetzer S, Senyo K, Shanahan P, Shawhan PS, Shields J, Slater W, Solomey N, Somalwar SV, Stone RL, Swallow EC, Taegar SA, Tesarek RJ, Thomson GB, Toale PA, Tripathi A, Tschirhart R, Turner SE, Wah YW, Wang J, White HB, Whitmore J, Winstein B, Winston R, Yamanaka T, and Zimmerman ED

Abstract

We observe 441 K(L)-->e(+)e(-)e(+)e(-) candidate events with a background of 4.2 events and measure B(K(L)-->e(+)e(-)e(+)e(-)) = [3.72+/-0.18(stat)+/-0.23(syst)]x10(-8) in the KTeV/E799II experiment at Fermilab. Using the distribution of the angle between the planes of the e(+)e(-) pairs, we measure the CP parameters beta(CP) = -0.23+/-0.09(stat)+/-0.02(syst) and gamma(CP) = -0.09+/-0.09(stat)+/-0.02(syst). We also present the first detailed study of the e(+)e(-) invariant mass spectrum in this decay mode.

Published
2001
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32. Measurement of the branching ratio and asymmetry of the decay Xi degrees -->Sigma degrees gamma.

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barker AR, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, Glazov A, Golossanov A, Graham G, Graham J, Hagan K, Halkiadakis E, Hamm J, Hanagaki K, Hidaka S, Hsiung YB, Jejer V, Jensen DA, Kessler R, Kobrak HG, LaDue J, Lath A, Ledovskoy A, McBride PL, Mikelsons P, Monnier E, Nakaya T, Nelson KS, Nguyen H, O'Dell V, Pang M, Pordes R, Prasad V, Quinn B, Ramberg EJ, Ray RE, Roodman A, Sadamoto M, Schnetzer S, Senyo K, Shanahan P, Shawhan PS, Shields J, Slater W, Solomey N, Somalwar SV, Stone RL, Suzuki I, Swallow EC, Taegar SA, Tesarek RJ, Thomson GB, Toale PA, Tripathi A, Tschirhart R, Turner SE, Wah YW, Wang J, White HB, Whitmore J, Winstein B, Winston R, Yamanaka T, and Zimmerman ED

Abstract

We have studied the rare weak radiative hyperon decay Xi degrees -->Sigma degrees gamma in the KTeV experiment at Fermilab. We have identified 4045 signal events over a background of 804 events. The dominant Xi degrees -->Lambdapi degrees decay, which was used for normalization, is the only important background source. An analysis of the acceptance of both modes yields a branching ratio of B(Xi degrees -->Sigma degrees gamma)/B(Xi degrees -->Lambdapi degrees ) = (3.34+/-0.05+/-0.09)x10(-3). By analyzing the final state decay distributions, we have also determined that the Sigma degrees emission asymmetry parameter for this decay is alpha(XiSigma) = -0.63+/-0.09.

Published
2001
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33. Study of the K(0)(L) --> pi(+)pi(-)gamma Direct Emission Vertex.

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barker AR, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, Glazov A, Golossanov A, Graham G, Graham J, Hagan K, Halkiadakis E, Hamm J, Hanagaki K, Hidaka S, Hsiung YB, Jejer V, Jensen DA, Kessler R, Kobrak HG, LaDue J, Lath A, Ledovskoy A, McBride PL, Mikelsons P, Monnier E, Nakaya T, Nelson KS, Nguyen H, O'Dell V, Pang M, Pordes R, Prasad V, Quinn B, Ramberg EJ, Ray RE, Roodman A, Sadamoto M, Schnetzer S, Senyo K, Shanahan P, Shawhan PS, Shields J, Slater W, Solomey N, Somalwar SV, Stone RL, Suzuki I, Swallow EC, Taegar SA, Tesarek RJ, Thomson GB, Toale PA, Tripathi A, Tschirhart R, Turner SE, Wah YW, Wang J, White HB, Whitmore J, Winstein B, Winston R, Yamanaka T, and Zimmerman ED

Abstract

We have performed studies of the K(0)(L)-->pi(+)pi(-)gamma direct emission ( DE) and inner Bremsstrahlung ( IB) vertices, based on data collected by KTeV during the 1996 Fermilab fixed target run. We find a(1)/a(2) = -0.737+/-0.034 GeV2 for the DE form-factor parameter in the rho-propagator parametrization, and report on fits of the form factor to linear and quadratic functions as well. We concurrently measure gamma(K(0)(L)-->pi(+)pi(-)gamma,E(*)(gamma)>20 MeV)/gamma(K(0)(L)-->pi(+)pi(-)) = (20.8+/-0.3)x10(-3), and a K(0)(L)-->pi(+)pi(-)gamma DE/(DE+IB) branching ratio of 0.683+/-0.011.

Published
2001
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34. Search for the decay KL --> pi(0)e+e-.

Author

Alavi-Harati A, Albuquerque IF, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barker AR, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, Fordyce PM, Glazov A, Golossanov A, Graham G, Graham J, Hagan K, Halkiadakis E, Hanagaki K, Hidaka S, Hsiung YB, Jejer V, Jennings J, Jensen DA, Kessler R, Kobrak HG, LaDue J, Lath A, Ledovskoy A, McBride PL, McManus AP, Mikelsons P, Monnier E, Nakaya T, Nelson KS, Nguyen H, O'Dell V, Pang M, Pordes R, Prasad V, Qiao C, Quinn B, Ramberg EJ, Ray RE, Roodman A, Sadamoto M, Schnetzer S, Senyo K, Shanahan P, Shawhan PS, Slater W, Solomey N, Somalwar SV, Stone RL, Suzuki I, Swallow EC, Swanson RA, Taegar SA, Tesarek RJ, Thomson GB, Toale PA, Tripathi A, Tschirhart R, Wah YW, Wang J, White HB, Whitmore J, Winstein B, Winston R, Yamanaka T, and Zimmerman ED

Abstract

We report on a search for the decay KL-->pi(0)e+e- carried out by the KTeV/E799 experiment at Fermilab. This decay is expected to have a significant CP violating contribution and the measurement of its branching ratio could support the Cabibbo-Kobayashi-Maskawa mechanism for CP violation or could point to new physics. Two events were observed in the 1997 data with an expected background of 1.06+/-0.41 events, and we set an upper limit B(KL-->pi(0)e+e-)<5.1 x 10(-10) at the 90% confidence level.

Published
2001
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35. Search for the decay K(L) --> pi(0)&mgr;(+)&mgr;(-)

Author

Alavi-Harati A, Albuquerque IF, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barker AR, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, and Glazov A

Abstract

We report on a search for the decay K(L)-->pi(0)&mgr;(+)&mgr;(-) carried out as a part of the KTeV experiment at Fermilab. This decay is expected to have a significant CP violating contribution and a direct measurement will either support the Cabibbo-Kobayashi-Maskawa mechanism for CP violation or point to new physics. Two events were observed in the 1997 data with an expected background of 0.87+/-0.15 events, and we set an upper limit B(K(L)-->pi(0)&mgr;(+)&mgr;(-))<3. 8x10(-10) at the 90% confidence level.

Published
2000
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36. Search for the weak decay of a lightly bound H0 dibaryon

Author

Alavi-Harati A, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barker AR, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, Glazov A, and Golossanov A

Abstract

We present results of a search for a new form of hadronic matter, a six-quark, dibaryon state called the H0, a state predicted to exist in several theoretical models. Analyzing data collected by experiment E799-II at Fermilab, we searched for the decay H0-->Lambdappi(-) and found no candidate events. We place an upper limit on [B(H0-->Lambdappi(-))dsigma(H)/dOmega]/(dsigma(Xi)/dOmega) and, in the context of published models, exclude the region of lightly bound mass states just below the LambdaLambda mass threshold, 2.194

Published
2000
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37. Observation of CP violation in K(L)-->pi(+)pi(-)e(+)e(-) decays

Author

Alavi-Harati A, Albuquerque IF, Alexopoulos T, Arenton M, Arisaka K, Averitte S, Barker AR, Bellantoni L, Bellavance A, Belz J, Ben-David R, Bergman DR, Blucher E, Bock GJ, Bown C, Bright S, Cheu E, Childress S, Coleman R, Corcoran MD, Corti G, Cox B, Crisler MB, Erwin AR, Ford R, and Glazov A

Abstract

We report the first observation of a manifestly CP violating effect in the K(L)-->pi(+)pi(-)e(+)e(-) decay mode. A large asymmetry was observed in the distribution of these decays in the CP-odd and T-odd angle straight phi between the decay planes of the e(+)e(-) and pi(+)pi(-) pairs in the K(L) center of mass system. After acceptance corrections, the overall asymmetry is found to be [13.6+/-2. 5(stat)+/-1.2(syst)]%. This is the largest CP-violating effect yet observed when integrating over the entire phase space of a mode and the first such effect observed in an angular variable.

Published
2000
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38. Single-Spin Asymmetries in Inclusive Charged Pion Production by Transversely Polarized Antiprotons.

Author

Bravar A, Adams DL, Akchurin N, Belikov NI, Bonner BE, Bystricky J, Corcoran MD, Cossairt JD, Cranshaw J, Derevschikov AA, En'yo H, Funahashi H, Goto Y, Grachov OA, Grosnick DP, Hill DA, Iijima T, Imai K, Itow Y, Iwatani K, Kharlov YV, Kuroda K, Laghai M, Lehar F, de Lesquen A, Lopiano D, Luehring FC, Maki T, Makino S, Masaike A, Matulenko YA, Meschanin AP, Michalowicz A, Miller DH, Miyake K, Nagamine T, Nessi-Tedaldi F, Nessi M, Nguyen C, Nurushev SB, Ohashi Y, Onel Y, Patalakha DI, Pauletta G, Penzo A, Rappazzo GF, Read AL, Roberts JB, van Rossum L, Rykov VL, Saito N, Salvato G, Schiavon P, Skeens J, Solovyanov VL, Spinka H, Stanek RW, Takashima R, Takeutchi F, Tamura N, Underwood DG, Vasiliev AN, White JL, and Yamashita S

Published
1996
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39. Single-spin asymmetries and invariant cross sections of the high transverse-momentum inclusive pi 0 production in 200 GeV/c pp and p-barp interactions.

Author

Adams DL, Akchurin N, Belikov NI, Bravar A, Bystricky J, Corcoran MD, Cossairt JD, Cranshaw J, Derevschikov AA, En'yo H, Funahashi H, Goto Y, Grachov OA, Grosnick DP, Hill DA, Iijima T, Imai K, Itow Y, Iwatani K, Krueger KW, Kuroda K, Lehar F, de Lesquen A, Lopiano D, Luehring FC, Maki T, Makino S, Masaike A, Matulenko YA, Meschanin AP, Michalowicz A, Miller DH, Miyake K, Nagamine T, Nessi-Tedaldi F, Nessi M, Nguyen C, Nurushev SB, Ohashi Y, Onel Y, Patalakha DI, Pauletta G, Penzo A, Read AL, Roberts JB, van Rossum L, Rykov VL, Saito N, Salvato G, Schiavon P, Shima T, Skeens J, Solovyanov VL, Spinka H, Stanek RW, Takashima R, Takeutchi F, Tamura N, Tanaka N, Underwood DG, Vasiliev AN, White JL, Yamashita S, and Yokosawa A

Published
1996
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40. A dependence of photoproduced dijets.

Author

Naples D, Akchurin N, Birmingham P, Breuer H, Chang CC, Cihangir S, Corcoran MD, Davis WL, Gustafson HR, Holmgren H, Kasper P, Lincoln D, Longo MJ, Marraffino J, McPherson J, Miettinen HE, Morrow G, Mutchler GS, Onel Y, Thomas GP, Traynor MM, Waters JW, Webster MS, Xu JP, and Zhu Q

Published
1994
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41. Observation of jet production by real photons.

Author

Adams D, Ahmad S, Akchurin N, Birmingham P, Breuer H, Chang CC, Cihangir S, Corcoran MD, Davis WL, Gustafson HR, Holmgren H, Kasper P, Kruk J, Lincoln D, Longo MJ, Marraffino J, McPherson J, Miettinen HE, Morrow G, Mutchler GS, Naples D, Onel Y, Skeens J, Thomas GP, Traynor MM, Waters JW, Webster MS, Xu JP, and Zhu Q

Published
1994
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42. Analyzing power measurement of pp elastic scattering in the Coulomb-nuclear interference region with the 200-GeV/c polarized-proton beam at Fermilab.

Author

Akchurin N, Langland J, Onel Y, Bonner BE, Corcoran MD, Cranshaw J, Nessi-Tedaldi F, Nessi M, Nguyen C, Roberts JB, Skeens J, White JL, Bravar A, Giacomich R, Penzo A, Schiavon P, Zanetti A, Bystricky J, Lehar F, de Lesquen A, van Rossum L, Cossairt JD, Read AL, Derevschikov AA, Matulenko YA, Meschanin AP, Nurushev SB, Patalakha DI, Rykov VL, Solovyanov VL, Vasiliev AN, Grosnick DP, Hill DA, Laghai M, Lopiano D, Ohashi Y, Shima T, Spinka H, Stanek RW, Underwood DG, Yokosawa A, Funahashi H, Goto Y, Imai K, Itow Y, Makino S, Masaike A, Miyake K, Nagamine T, Saito N, Yamashita S, Iwatani K, Kuroda K, Michalowicz A, Luehring FC, Miller DH, Maki T, Pauletta G, Rappazzo GF, Salvato G, Takashima R, and Takeutchi F

Published
1993
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44. Measurement of the analyzing power in the Primakoff process with a high-energy polarized proton beam.

Author

Carey DC, Coleman RN, Corcoran MD, Cossairt JD, Derevschikov AA, Grosnick DP, Hill D, Imai K, Konaka A, Kuroda K, Lehar F, de Lesquen A, Lopiano D, Luehring FC, Maki T, Makino S, Masaike A, Matulenko YA, Meschanin AP, Michalowicz A, Miller DH, Miyake K, Nagamine T, Nakano T, Nessi-Tedaldi F, Nessi M, Nguyen C, Nurushev SB, Ohashi Y, Pauletta G, Penzo A, Phillips GC, Read AL, Roberts JB, van Rossum L, Salvato G, Schiavon P, Shima T, Solovyanov VL, Spinka H, Stanek RW, Takashima R, Takeutchi F, Tamura N, Tanaka N, Underwood DG, Vasiliev AN, Villari A, White JL, Yokosawa A, Yoshida T, and Zanetti A

Published
1990
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45. Analyzing power of inclusive production of pi +, pi -, and KS0 by polarized protons at 13.3 and 18.5 GeV/c.

Author

Bonner BE, Buchanan JA, Clement JM, Corcoran MD, Krishna NM, Kruk JW, Miettinen HE, Moss RM, Mutchler GS, Nessi-Tedaldi F, Nessi M, Phillips GC, Roberts JB, Stevenson PM, Tonse SR, Birman A, Chung SU, Etkin A, Fernow RC, Kirk H, Protopopescu SD, Willutzki H, Hallman T, Madansky L, Bar-Yam Z, Dowd J, Kern W, King E, Mayes BW, and Pinsky LS

Published
1990
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47. Spin transfer in hyperon production.

Author

Bonner BE, Buchanan JA, Clement JM, Corcoran MD, Kruk JW, Miettinen HE, Moss RM, Mutchler GS, Nessi-Tedaldi F, Nessi M, Phillips GC, Roberts JB, Stevenson PM, Tonse SR, Birman A, Chung SU, Fernow RC, Kirk H, Protopopescu SD, Hallman T, Madansky L, Mayes BW, Pinsky LS, Bar-Yam Z, Dowd J, Kern W, and King E

Published
1987
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48. Study of the reaction p

Author

Wicklund AB, Arenton MW, Ayres DS, Diebold R, May EN, Nodulman LJ, Sauer JR, Swallow EC, Calkin MM, Corcoran MD, Hoftiezer J, Miettinen HE, and Mutchler GS

Published
1987
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50. Spin-parameter measurements in inclusive Sigma 0 production.

Author

Bonner BE, Buchanan JA, Clement JM, Corcoran MD, Krishna NM, Kruk JW, Lincoln DW, Miettinen HE, Mutchler GS, Nessi-Tedaldi F, Nessi M, Phillips GC, Roberts JB, Stevenson PM, Tonse SR, White JL, Chung SU, Etkin A, Fernow RC, Protopopescu SD, Willutzki H, Hallman T, Madansky L, and Pinsky LS

Published
1989
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