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327 results on '"Marini, Andrea"'

1. Theory of nonlinear and amplified surface plasmon polaritons

Author

Marini, Andrea and Skryabin, Dmitry

Subjects
530.44, plasmon polaritons, solitary waves
Abstract

This thesis presents a study of Surface Plasmon Polaritons (SPPs) in hybrid metal-dielectric waveguides. The embedding of metal in nanostructured photonic components allows for manipulating and guiding light at the subwavelength scale. Such an extreme confinement enhances the nonlinear response of the dielectric medium, which is important for applications in optical processing of information, but is paid in terms of considerable ohmic loss in the metal. It is, however, possible to embed externally pumped active inclusions in the dielectric in order to compensate for the metal loss. A novel perturbative theory for Maxwell equations is introduced and applied to various nonlinear metal-dielectric structures, deriving the propagation equation for the optical field. The nonlinear dispersion law for amplified SPPs, filamentation and dissipative plasmon-soliton formation have been studied, revealing intrinsic core and tail instabilities that prevent solitons to propagate over long distances. Stable propagation of plasmon-solitons can be achieved in insulator-metal-insulator structures with active and passive interfaces. The active SPP is coupled with the passive SPP, which absorbs the perturbations destabilising the zero background of the soliton. Theoretical modelling of optical propagation in metal-dielectric stacks predicts a modified two-band structure, allowing for gap/discrete plasmon-soliton formation. Loss and nonlinear parameters in subwavelength nanowire waveguides are evaluated and compared to the results obtained by other research groups. In all calculations, particular attention is paid in considering boundary conditions accounting for loss and nonlinear corrections, which contribute to the propagation equation with a surface term that becomes significant in the subwavelength regime.

Published
2011

2. What a thousand children tell us about grammatical complexity and working memory: A cross-sectional analysis on the comprehension of clitics and passives in Italian

Author

Moscati, Vincenzo, Marini, Andrea, Biondo, Nicoletta, Moscati, Vincenzo, Marini, Andrea, and Biondo, Nicoletta

Abstract

Published online: 28 November 2023, Data from 996 Italian-speaking children were collected and analyzed to assess whether a movement-based notion of grammatical complexity is adequate to capture the developmental trend of clitics and passives in Italian. A second goal of the study was to address the relationship between working memory and syntactic development, exploring the hypothesis that higher digit span values predict better comprehension of complex matrix sentences. The results confirm the validity of a ranking of grammatical structures based on constituent movement, with both clitics and passives developing in parallel and later than canonical SVO sentences. Working memory also shows an effect on sentence comprehension in general, but standard measures (digit span forward/backward) do not show a selective advantage in handling complex constructions such as clitics and passives.

Published
2023

3. The James Webb Space Telescope Mission

Author

Gardner, Jonathan P., Mather, John C., Abbott, Randy, Abell, James S., Abernathy, Mark, Abney, Faith E., Abraham, John G., Abraham, Roberto, Abul-Huda, Yasin M., Acton, Scott, Adams, Cynthia K., Adams, Evan, Adler, David S., Adriaensen, Maarten, Aguilar, Jonathan Albert, Ahmed, Mansoor, Ahmed, Nasif S., Ahmed, Tanjira, Albat, Rüdeger, Albert, Loïc, Alberts, Stacey, Aldridge, David, Allen, Mary Marsha, Allen, Shaune S., Altenburg, Martin, Altunc, Serhat, Alvarez, Jose Lorenzo, Álvarez-Márquez, Javier, Oliveira, Catarina Alves de, Ambrose, Leslie L., Anandakrishnan, Satya M., Andersen, Gregory C., Anderson, Harry James, Anderson, Jay, Anderson, Kristen, Anderson, Sara M., Aprea, Julio, Archer, Benita J., Arenberg, Jonathan W., Argyriou, Ioannis, Arribas, Santiago, Artigau, Étienne, Arvai, Amanda Rose, Atcheson, Paul, Atkinson, Charles B., Averbukh, Jesse, Aymergen, Cagatay, Bacinski, John J., Baggett, Wayne E., Bagnasco, Giorgio, Baker, Lynn L., Balzano, Vicki Ann, Banks, Kimberly A., Baran, David A., Barker, Elizabeth A., Barrett, Larry K., Barringer, Bruce O., Barto, Allison, Bast, William, Baudoz, Pierre, Baum, Stefi, Beatty, Thomas G., Beaulieu, Mathilde, Bechtold, Kathryn, Beck, Tracy, Beddard, Megan M., Beichman, Charles, Bellagama, Larry, Bely, Pierre, Berger, Timothy W., Bergeron, Louis E., Bernier, Antoine-Darveau, Bertch, Maria D., Beskow, Charlotte, Betz, Laura E., Biagetti, Carl P., Birkmann, Stephan, Bjorklund, Kurt F., Blackwood, James D., Blazek, Ronald Paul, Blossfeld, Stephen, Bluth, Marcel, Boccaletti, Anthony, Jr, Martin E. Boegner, Bohlin, Ralph C., Boia, John Joseph, Böker, Torsten, Bonaventura, N., Bond, Nicholas A., Bosley, Kari Ann, Boucarut, Rene A., Bouchet, Patrice, Bouwman, Jeroen, Bower, Gary, Bowers, Ariel S., Bowers, Charles W., Boyce, Leslye A., Boyer, Christine T., Boyer, Martha L., Boyer, Michael, Boyer, Robert, Bradley, Larry D., Brady, Gregory R., Brandl, Bernhard R., Brannen, Judith L., Breda, David, Bremmer, Harold G., Brennan, David, Bresnahan, Pamela A., Bright, Stacey N., Broiles, Brian J., Bromenschenkel, Asa, Brooks, Brian H., Brooks, Keira J., Brown, Bob, Brown, Bruce, Brown, Thomas M., Bruce, Barry W., Bryson, Jonathan G., Bujanda, Edwin D., Bullock, Blake M., Bunker, A. J., Bureo, Rafael, Burt, Irving J., Bush, James Aaron, Bushouse, Howard A., Bussman, Marie C., Cabaud, Olivier, Cale, Steven, Calhoon, Charles D., Calvani, Humberto, Canipe, Alicia M., Caputo, Francis M., Cara, Mihai, Carey, Larkin, Case, Michael Eli, Cesari, Thaddeus, Cetorelli, Lee D., Chance, Don R., Chandler, Lynn, Chaney, Dave, Chapman, George N., Charlot, S., Chayer, Pierre, Cheezum, Jeffrey I., Chen, Bin, Chen, Christine H., Cherinka, Brian, Chichester, Sarah C., Chilton, Zachary S., Chittiraibalan, Dharini, Clampin, Mark, Clark, Charles R., Clark, Kerry W., Clark, Stephanie M., Claybrooks, Edward E., Cleveland, Keith A., Cohen, Andrew L., Cohen, Lester M., Colón, Knicole D., Coleman, Benee L., Colina, Luis, Comber, Brian J., Comeau, Thomas M., Comer, Thomas, Reis, Alain Conde, Connolly, Dennis C., Conroy, Kyle E., Contos, Adam R., Contreras, James, Cook, Neil J., Cooper, James L., Cooper, Rachel Aviva, Correia, Michael F., Correnti, Matteo, Cossou, Christophe, Costanza, Brian F., Coulais, Alain, Cox, Colin R., Coyle, Ray T., Cracraft, Misty M., Crew, Keith A., Curtis, Gary J., Cusveller, Bianca, Maciel, Cleyciane Da Costa, Dailey, Christopher T., Daugeron, Frédéric, Davidson, Greg S., Davies, James E., Davis, Katherine Anne, Davis, Michael S., Day, Ratna, Chambure, Daniel de, Jong, Pauline de, Marchi, Guido De, Dean, Bruce H., Decker, John E., Delisa, Amy S., Dell, Lawrence C., Dellagatta, Gail, Dembinska, Franciszka, Demosthenes, Sandor, Dencheva, Nadezhda M., Deneu, Philippe, DePriest, William W., Deschenes, Jeremy, Dethienne, Nathalie, Detre, Örs Hunor, Diaz, Rosa Izela, Dicken, Daniel, DiFelice, Audrey S., Dillman, Matthew, Disharoon, Maureen O., Dixon, William V., Doggett, Jesse B., Dominguez, Keisha L., Donaldson, Thomas S., Doria-Warner, Cristina M., Santos, Tony Dos, Doty, Heather, Robert E. Douglas, Jr, Doyon, René, Dressler, Alan, Driggers, Jennifer, Driggers, Phillip A., Dunn, Jamie L., DuPrie, Kimberly C., Dupuis, Jean, Durning, John, Dutta, Sanghamitra B., Earl, Nicholas M., Eccleston, Paul, Ecobichon, Pascal, Egami, Eiichi, Ehrenwinkler, Ralf, Eisenhamer, Jonathan D., Eisenhower, Michael, Eisenstein, Daniel J., Hamel, Zaky El, Elie, Michelle L., Elliott, James, Elliott, Kyle Wesley, Engesser, Michael, Espinoza, Néstor, Etienne, Odessa, Etxaluze, Mireya, Evans, Leah, Fabreguettes, Luce, Falcolini, Massimo, Falini, Patrick R., Fatig, Curtis, Feeney, Matthew, Feinberg, Lee D., Fels, Raymond, Ferdous, Nazma, Ferguson, Henry C., Ferrarese, Laura, Ferreira, Marie-Héléne, Ferruit, Pierre, Ferry, Malcolm, Filippazzo, Joseph Charles, Firre, Daniel, Fix, Mees, Flagey, Nicolas, Flanagan, Kathryn A., Fleming, Scott W., Florian, Michael, Flynn, James R., Foiadelli, Luca, Fontaine, Mark R., Fontanella, Erin Marie, Forshay, Peter Randolph, Fortner, Elizabeth A., Fox, Ori D., Framarini, Alexandro P., Francisco, John I., Franck, Randy, Franx, Marijn, Franz, David E., Friedman, Scott D., Friend, Katheryn E., Frost, James R., Fu, Henry, Fullerton, Alexander W., Gaillard, Lionel, Galkin, Sergey, Gallagher, Ben, Galyer, Anthony D., Marín, Macarena García, Gardner, Lisa E., Garland, Dennis, Garrett, Bruce Albert, Gasman, Danny, Gáspár, András, Gastaud, René, Gaudreau, Daniel, Gauthier, Peter Timothy, Geers, Vincent, Geithner, Paul H., Gennaro, Mario, Gerber, John, Gereau, John C., Giampaoli, Robert, Giardino, Giovanna, Gibbons, Paul C., Gilbert, Karoline, Gilman, Larry, Girard, Julien H., Giuliano, Mark E., Gkountis, Konstantinos, Glasse, Alistair, Glassmire, Kirk Zachary, Glauser, Adrian Michael, Glazer, Stuart D., Goldberg, Joshua, Golimowski, David A., Gonzaga, Shireen P., Gordon, Karl D., Gordon, Shawn J., Goudfrooij, Paul, Gough, Michael J., Graham, Adrian J., Grau, Christopher M., Green, Joel David, Greene, Gretchen R., Greene, Thomas P., Greenfield, Perry E., Greenhouse, Matthew A., Greve, Thomas R., Greville, Edgar M., Grimaldi, Stefano, Groe, Frank E., Groebner, Andrew, Grumm, David M., Grundy, Timothy, Güdel, Manuel, Guillard, Pierre, Guldalian, John, Gunn, Christopher A., Gurule, Anthony, Gutman, Irvin Meyer, Guy, Paul D., Guyot, Benjamin, Hack, Warren J., Haderlein, Peter, Hagan, James B., Hagedorn, Andria, Hainline, Kevin, Haley, Craig, Hami, Maryam, Hamilton, Forrest Clifford, Hammann, Jeffrey, Hammel, Heidi B., Hanley, Christopher J., Hansen, Carl August, Hardy, Bruce, Harnisch, Bernd, Harr, Michael Hunter, Harris, Pamela, Hart, Jessica Ann, Hartig, George F., Hasan, Hashima, Hashim, Kathleen Marie, Hashimoto, Ryan, Haskins, Sujee J., Hawkins, Robert Edward, Hayden, Brian, Hayden, William L., Healy, Mike, Hecht, Karen, Heeg, Vince J., Hejal, Reem, Helm, Kristopher A., Hengemihle, Nicholas J., Henning, Thomas, Henry, Alaina, Henry, Ronald L., Henshaw, Katherine, Hernandez, Scarlin, Herrington, Donald C., Heske, Astrid, Hesman, Brigette Emily, Hickey, David L., Hilbert, Bryan N., Hines, Dean C., Hinz, Michael R., Hirsch, Michael, Hitcho, Robert S., Hodapp, Klaus, Hodge, Philip E., Hoffman, Melissa, Holfeltz, Sherie T., Holler, Bryan Jason, Hoppa, Jennifer Rose, Horner, Scott, Howard, Joseph M., Howard, Richard J., Huber, Jean M., Hunkeler, Joseph S., Hunter, Alexander, Hunter, David Gavin, Hurd, Spencer W., Hurst, Brendan J., Hutchings, John B., Hylan, Jason E., Ignat, Luminita Ilinca, Illingworth, Garth, Irish, Sandra M., Iii, John C. Isaacs, Jr, Wallace C. Jackson, Jaffe, Daniel T., Jahic, Jasmin, Jahromi, Amir, Jakobsen, Peter, James, Bryan, James, John C., James, LeAndrea Rae, Jamieson, William Brian, Jandra, Raymond D., Jayawardhana, Ray, Jedrzejewski, Robert, Jeffers, Basil S., Jensen, Peter, Joanne, Egges, Johns, Alan T., Johnson, Carl A., Johnson, Eric L., Johnson, Patricia, Johnson, Phillip Stephen, Johnson, Thomas K., Johnson, Timothy W., Johnstone, Doug, Jollet, Delphine, Jones, Danny P., Jones, Gregory S., Jones, Olivia C., Jones, Ronald A., Jones, Vicki, Jordan, Ian J., Jordan, Margaret E., Jue, Reginald, Jurkowski, Mark H., Justis, Grant, Justtanont, Kay, Kaleida, Catherine C., Kalirai, Jason S., Kalmanson, Phillip Cabrales, Kaltenegger, Lisa, Kammerer, Jens, Kan, Samuel K., Kanarek, Graham Childs, Kao, Shaw-Hong, Karakla, Diane M., Karl, Hermann, Kassin, Susan A., Kauffman, David D., Kavanagh, Patrick, Kelley, Leigh L., Kelly, Douglas M., Kendrew, Sarah, Kennedy, Herbert V., Kenny, Deborah A., Keski-Kuha, Ritva A., Keyes, Charles D., Khan, Ali, Kidwell, Richard C., Kimble, Randy A., King, James S., King, Richard C., Kinzel, Wayne M., Kirk, Jeffrey R., Kirkpatrick, Marc E., Klaassen, Pamela, Klingemann, Lana, Klintworth, Paul U., Knapp, Bryan Adam, Knight, Scott, Knollenberg, Perry J., Knutsen, Daniel Mark, Koehler, Robert, Koekemoer, Anton M., Kofler, Earl T., Kontson, Vicki L., Kovacs, Aiden Rose, Kozhurina-Platais, Vera, Krause, Oliver, Kriss, Gerard A., Krist, John, Kristoffersen, Monica R., Krogel, Claudia, Krueger, Anthony P., Kulp, Bernard A., Kumari, Nimisha, Kwan, Sandy W., Kyprianou, Mark, Labador, Aurora Gadiano, Labiano, Álvaro, Lafrenière, David, Lagage, Pierre-Olivier, Laidler, Victoria G., Laine, Benoit, Laird, Simon, Lajoie, Charles-Philippe, Lallo, Matthew D., Lam, May Yen, LaMassa, Stephanie Marie, Lambros, Scott D., Lampenfield, Richard Joseph, Lander, Matthew Ed, Langston, James Hutton, Larson, Kirsten, Larson, Melora, LaVerghetta, Robert Joseph, Law, David R., Lawrence, Jon F., Lee, David W., Lee, Janice, Lee, Yat-Ning Paul, Leisenring, Jarron, Leveille, Michael Dunlap, Levenson, Nancy A., Levi, Joshua S., Levine, Marie B., Lewis, Dan, Lewis, Jake, Lewis, Nikole, Libralato, Mattia, Lidon, Norbert, Liebrecht, Paula Louisa, Lightsey, Paul, Lilly, Simon, Lim, Frederick C., Lim, Pey Lian, Ling, Sai-Kwong, Link, Lisa J., Link, Miranda Nicole, Lipinski, Jamie L., Liu, XiaoLi, Lo, Amy S., Lobmeyer, Lynette, Logue, Ryan M., Long, Chris A., Long, Douglas R., Long, Ilana D., Long, Knox S., López-Caniego, Marcos, Lotz, Jennifer M., Love-Pruitt, Jennifer M., Lubskiy, Michael, Luers, Edward B., Luetgens, Robert A., Luevano, Annetta J., Lui, Sarah Marie G. Flores, Iii, James M. Lund, Lundquist, Ray A., Lunine, Jonathan, Lützgendorf, Nora, Lynch, Richard J., MacDonald, Alex J., MacDonald, Kenneth, Macias, Matthew J., Macklis, Keith I., Maghami, Peiman, Maharaja, Rishabh Y., Maiolino, Roberto, Makrygiannis, Konstantinos G., Malla, Sunita Giri, Malumuth, Eliot M., Manjavacas, Elena, Marini, Andrea, Marrione, Amanda, Marston, Anthony, Martel, André R, Martin, Didier, Martin, Peter G., Martinez, Kristin L., Maschmann, Marc, Masci, Gregory L., Masetti, Margaret E., Maszkiewicz, Michael, Matthews, Gary, Matuskey, Jacob E., McBrayer, Glen A., McCarthy, Donald W., McCaughrean, Mark J., McClare, Leslie A., McClare, Michael D., McCloskey, John C., McClurg, Taylore D., McCoy, Martin, McElwain, Michael W., McGregor, Roy D., McGuffey, Douglas B., McKay, Andrew G., McKenzie, William K., McLean, Brian, McMaster, Matthew, McNeil, Warren, Meester, Wim De, Mehalick, Kimberly L., Meixner, Margaret, Meléndez, Marcio, Menzel, Michael P., Menzel, Michael T., Merz, Matthew, Mesterharm, David D., Meyer, Michael R., Meyett, Michele L., Meza, Luis E., Midwinter, Calvin, Milam, Stefanie N., Miller, Jay Todd, Miller, William C., Miskey, Cherie L., Misselt, Karl, Mitchell, Eileen P., Mohan, Martin, Montoya, Emily E., Moran, Michael J., Morishita, Takahiro, Moro-Martín, Amaya, Morrison, Debra L., Morrison, Jane, Morse, Ernie C., Moschos, Michael, Moseley, S. H., Mosier, Gary E., Mosner, Peter, Mountain, Matt, Muckenthaler, Jason S., Mueller, Donald G., Mueller, Migo, Muhiem, Daniella, Mühlmann, Prisca, Mullally, Susan Elizabeth, Mullen, Stephanie M., Munger, Alan J, Murphy, Jess, Murray, Katherine T., Muzerolle, James C., Mycroft, Matthew, Myers, Andrew, Myers, Carey R., Myers, Fred Richard R., Myers, Richard, Myrick, Kaila, Adrian F. Nagle, IV, Nayak, Omnarayani, Naylor, Bret, Neff, Susan G., Nelan, Edmund P., Nella, John, Nguyen, Duy Tuong, Nguyen, Michael N., Nickson, Bryony, Nidhiry, John Joseph, Niedner, Malcolm B., Nieto-Santisteban, Maria, Nikolov, Nikolay K., Nishisaka, Mary Ann, Noriega-Crespo, Alberto, Nota, Antonella, O’Mara, Robyn C., Oboryshko, Michael, O’Brien, Marcus B., Ochs, William R., Offenberg, Joel D., Ogle, Patrick Michael, Ohl, Raymond G., Olmsted, Joseph Hamden, Osborne, Shannon Barbara, O’Shaughnessy, Brian Patrick, Östlin, Göran, O’Sullivan, Brian, Otor, O. Justin, Ottens, Richard, Ouellette, Nathalie N.-Q., Outlaw, Daria J., Owens, Beverly A., Pacifici, Camilla, Page, James Christophe, Paranilam, James G., Park, Sang, Parrish, Keith A., Paschal, Laura, Patapis, Polychronis, Patel, Jignasha, Patrick, Keith, Jr, Robert A. Pattishall, Paul, Douglas William, Paul, Shirley J., Pauly, Tyler Andrew, Pavlovsky, Cheryl M., Peña-Guerrero, Maria, Pedder, Andrew H., Peek, Matthew Weldon, Pelham, Patricia A., Penanen, Konstantin, Perriello, Beth A., Perrin, Marshall D., Perrine, Richard F., Perrygo, Chuck, Peslier, Muriel, Petach, Michael, Peterson, Karla A., Pfarr, Tom, Pierson, James M., Pietraszkiewicz, Martin, Pilchen, Guy, Pipher, Judy L., Pirzkal, Norbert, Pitman, Joseph T., Player, Danielle M., Plesha, Rachel, Plitzke, Anja, Pohner, John A., Poletis, Karyn Konstantin, Pollizzi, Joseph A., Polster, Ethan, Pontius, James T., Pontoppidan, Klaus, Porges, Susana C., Potter, Gregg D., Prescott, Stephen, Proffitt, Charles R., Pueyo, Laurent, Neira, Irma Aracely Quispe, Radich, Armando, Rager, Reiko T., Rameau, Julien, Ramey, Deborah D., Alarcon, Rafael Ramos, Rampini, Riccardo, Rapp, Robert, Rashford, Robert A., Rauscher, Bernard J., Ravindranath, Swara, Rawle, Timothy, Rawlings, Tynika N., Ray, Tom, Regan, Michael W., Rehm, Brian, Rehm, Kenneth D., Reid, Neill, Reis, Carl A., Renk, Florian, Reoch, Tom B., Ressler, Michael, Rest, Armin W., Reynolds, Paul J., Richon, Joel G., Richon, Karen V., Ridgaway, Michael, Riedel, Adric Richard, Rieke, George H., Rieke, Marcia J., Rifelli, Richard E., Rigby, Jane R., Riggs, Catherine S., Ringel, Nancy J., Ritchie, Christine E., Rix, Hans-Walter, Robberto, Massimo, Robinson, Gregory L., Robinson, Michael S., Robinson, Orion, Rock, Frank W., Rodriguez, David R., Pino, Bruno Rodríguez del, Roellig, Thomas, Rohrbach, Scott O., Roman, Anthony J., Romelfanger, Frederick J., Jr, Felipe P. Romo, Rosales, Jose J., Rose, Perry, Roteliuk, Anthony F., Roth, Marc N., Rothwell, Braden Quinn, Rouzaud, Sylvain, Rowe, Jason, Rowlands, Neil, Roy, Arpita, Royer, Pierre, Rui, Chunlei, Rumler, Peter, Rumpl, William, Russ, Melissa L., Ryan, Michael B., Ryan, Richard M., Saad, Karl, Sabata, Modhumita, Sabatino, Rick, Sabbi, Elena, Sabelhaus, Phillip A., Sabia, Stephen, Sahu, Kailash C., Saif, Babak N., Salvignol, Jean-Christophe, Samara-Ratna, Piyal, Samuelson, Bridget S., Sanders, Felicia A., Sappington, Bradley, Sargent, B. A., Sauer, Arne, Savadkin, Bruce J., Sawicki, Marcin, Schappell, Tina M., Scheffer, Caroline, Scheithauer, Silvia, Scherer, Ron, Schiff, Conrad, Schlawin, Everett, Schmeitzky, Olivier, Schmitz, Tyler S., Schmude, Donald J., Schneider, Analyn, Schreiber, Jürgen, Schroeven-Deceuninck, Hilde, Schultz, John J., Schwab, Ryan, Schwartz, Curtis H., Scoccimarro, Dario, Scott, John F., Scott, Michelle B., Seaton, Bonita L., Seely, Bruce S., Seery, Bernard, Seidleck, Mark, Sembach, Kenneth, Shanahan, Clare Elizabeth, Shaughnessy, Bryan, Shaw, Richard A., Shay, Christopher Michael, Sheehan, Even, Sheth, Kartik, Shih, Hsin-Yi, Shivaei, Irene, Siegel, Noah, Sienkiewicz, Matthew G., Simmons, Debra D., Simon, Bernard P., Sirianni, Marco, Sivaramakrishnan, Anand, Slade, Jeffrey E., Sloan, G. C., Slocum, Christine E., Slowinski, Steven E., Smith, Corbett T., Smith, Eric P., Smith, Erin C., Smith, Koby, Smith, Robert, Smith, Stephanie J., Smolik, John L., Soderblom, David R., Sohn, Sangmo Tony, Sokol, Jeff, Sonneborn, George, Sontag, Christopher D., Sooy, Peter R., Soummer, Remi, Southwood, Dana M., Spain, Kay, Sparmo, Joseph, Speer, David T., Spencer, Richard, Sprofera, Joseph D., Stallcup, Scott S., Stanley, Marcia K., Stansberry, John A., Stark, Christopher C., Starr, Carl W., Stassi, Diane Y., Steck, Jane A., Steeley, Christine D., Stephens, Matthew A., Stephenson, Ralph J., Stewart, Alphonso C., Stiavelli, Massimo, Jr, Hervey Stockman, Strada, Paolo, Straughn, Amber N., Streetman, Scott, Strickland, David Kendal, Strobele, Jingping F., Stuhlinger, Martin, Stys, Jeffrey Edward, Such, Miguel, Sukhatme, Kalyani, Sullivan, Joseph F., Sullivan, Pamela C., Sumner, Sandra M., Sun, Fengwu, Sunnquist, Benjamin Dale, Swade, Daryl Allen, Swam, Michael S., Swenton, Diane F., Swoish, Robby A., Litten, Oi In Tam, Tamas, Laszlo, Tao, Andrew, Taylor, David K., Taylor, Joanna M., Plate, Maurice te, Tea, Mason Van, Teague, Kelly K., Telfer, Randal C., Temim, Tea, Texter, Scott C., Thatte, Deepashri G., Thompson, Christopher Lee, Thompson, Linda M., Thomson, Shaun R., Thronson, Harley, Tierney, C. M., Tikkanen, Tuomo, Tinnin, Lee, Tippet, William Thomas, Todd, Connor William, Tran, Hien D., Trauger, John, Trejo, Edwin Gregorio, Truong, Justin Hoang Vinh, Tsukamoto, Christine L., Tufail, Yasir, Tumlinson, Jason, Tustain, Samuel, Tyra, Harrison, Ubeda, Leonardo, Underwood, Kelli, Uzzo, Michael A., Vaclavik, Steven, Valenduc, Frida, Valenti, Jeff A., Campen, Julie Van, Wetering, Inge van de, Marel, Roeland P. Van Der, Haarlem, Remy van, Vandenbussche, Bart, Dishoeck, Ewine F. van, Vanterpool, Dona D., Vernoy, Michael R., Costas, Maria Begoña Vila, Volk, Kevin, Voorzaat, Piet, Voyton, Mark F., Vydra, Ekaterina, Waddy, Darryl J., Waelkens, Christoffel, Wahlgren, Glenn Michael, Jr, Frederick E. Walker, Wander, Michel, Warfield, Christine K., Warner, Gerald, Wasiak, Francis C., Wasiak, Matthew F., Wehner, James, Weiler, Kevin R., Weilert, Mark, Weiss, Stanley B., Wells, Martyn, Welty, Alan D., Wheate, Lauren, Wheeler, Thomas P., White, Christy L., Whitehouse, Paul, Whiteleather, Jennifer Margaret, Whitman, William Russell, Williams, Christina C., Willmer, Christopher N. A., Willott, Chris J., Willoughby, Scott P., Wilson, Andrew, Wilson, Debra, Wilson, Donna V., Windhorst, Rogier, Wislowski, Emily Christine, Wolfe, David J., Wolfe, Michael A., Wolff, Schuyler, Wondel, Amancio, Woo, Cindy, Woods, Robert T., Worden, Elaine, Workman, William, Wright, Gillian S., Wu, Carl, Wu, Chi-Rai, Wun, Dakin D., Wymer, Kristen B., Yadetie, Thomas, Yan, Isabelle C., Yang, Keith C., Yates, Kayla L., Yeager, Christopher R., Yerger, Ethan John, Young, Erick T., Young, Gary, Yu, Gene, Yu, Susan, Zak, Dean S., Zeidler, Peter, Zepp, Robert, Zhou, Julia, Zincke, Christian A., Zonak, Stephanie, Zondag, Elisabeth, Gardner, Jonathan P., Mather, John C., Abbott, Randy, Abell, James S., Abernathy, Mark, Abney, Faith E., Abraham, John G., Abraham, Roberto, Abul-Huda, Yasin M., Acton, Scott, Adams, Cynthia K., Adams, Evan, Adler, David S., Adriaensen, Maarten, Aguilar, Jonathan Albert, Ahmed, Mansoor, Ahmed, Nasif S., Ahmed, Tanjira, Albat, Rüdeger, Albert, Loïc, Alberts, Stacey, Aldridge, David, Allen, Mary Marsha, Allen, Shaune S., Altenburg, Martin, Altunc, Serhat, Alvarez, Jose Lorenzo, Álvarez-Márquez, Javier, Oliveira, Catarina Alves de, Ambrose, Leslie L., Anandakrishnan, Satya M., Andersen, Gregory C., Anderson, Harry James, Anderson, Jay, Anderson, Kristen, Anderson, Sara M., Aprea, Julio, Archer, Benita J., Arenberg, Jonathan W., Argyriou, Ioannis, Arribas, Santiago, Artigau, Étienne, Arvai, Amanda Rose, Atcheson, Paul, Atkinson, Charles B., Averbukh, Jesse, Aymergen, Cagatay, Bacinski, John J., Baggett, Wayne E., Bagnasco, Giorgio, Baker, Lynn L., Balzano, Vicki Ann, Banks, Kimberly A., Baran, David A., Barker, Elizabeth A., Barrett, Larry K., Barringer, Bruce O., Barto, Allison, Bast, William, Baudoz, Pierre, Baum, Stefi, Beatty, Thomas G., Beaulieu, Mathilde, Bechtold, Kathryn, Beck, Tracy, Beddard, Megan M., Beichman, Charles, Bellagama, Larry, Bely, Pierre, Berger, Timothy W., Bergeron, Louis E., Bernier, Antoine-Darveau, Bertch, Maria D., Beskow, Charlotte, Betz, Laura E., Biagetti, Carl P., Birkmann, Stephan, Bjorklund, Kurt F., Blackwood, James D., Blazek, Ronald Paul, Blossfeld, Stephen, Bluth, Marcel, Boccaletti, Anthony, Jr, Martin E. Boegner, Bohlin, Ralph C., Boia, John Joseph, Böker, Torsten, Bonaventura, N., Bond, Nicholas A., Bosley, Kari Ann, Boucarut, Rene A., Bouchet, Patrice, Bouwman, Jeroen, Bower, Gary, Bowers, Ariel S., Bowers, Charles W., Boyce, Leslye A., Boyer, Christine T., Boyer, Martha L., Boyer, Michael, Boyer, Robert, Bradley, Larry D., Brady, Gregory R., Brandl, Bernhard R., Brannen, Judith L., Breda, David, Bremmer, Harold G., Brennan, David, Bresnahan, Pamela A., Bright, Stacey N., Broiles, Brian J., Bromenschenkel, Asa, Brooks, Brian H., Brooks, Keira J., Brown, Bob, Brown, Bruce, Brown, Thomas M., Bruce, Barry W., Bryson, Jonathan G., Bujanda, Edwin D., Bullock, Blake M., Bunker, A. 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Abstract

Twenty-six years ago a small committee report, building on earlier studies, expounded a compelling and poetic vision for the future of astronomy, calling for an infrared-optimized space telescope with an aperture of at least 4 m. With the support of their governments in the US, Europe, and Canada, 20,000 people realized that vision as the 6.5 m James Webb Space Telescope. A generation of astronomers will celebrate their accomplishments for the life of the mission, potentially as long as 20 yr, and beyond. This report and the scientific discoveries that follow are extended thank-you notes to the 20,000 team members. The telescope is working perfectly, with much better image quality than expected. In this and accompanying papers, we give a brief history, describe the observatory, outline its objectives and current observing program, and discuss the inventions and people who made it possible. We cite detailed reports on the design and the measured performance on orbit.

Published
2023

4. Real-Time Oil Leakage Detection on Aftermarket Motorcycle Damping System with Convolutional Neural Networks

Author

Bianchi, Federico, Speziali, Stefano, Marini, Andrea, Proietti, Massimiliano, Menculini, Lorenzo, Garinei, Alberto, Bellani, Gabriele, Marconi, Marcello, Bianchi, Federico, Speziali, Stefano, Marini, Andrea, Proietti, Massimiliano, Menculini, Lorenzo, Garinei, Alberto, Bellani, Gabriele, and Marconi, Marcello

Abstract

In this work, we describe in detail how Deep Learning and Computer Vision can help to detect fault events of the AirTender system, an aftermarket motorcycle damping system component. One of the most effective ways to monitor the AirTender functioning is to look for oil stains on its surface. Starting from real-time images, AirTender is first detected in the motorbike suspension system, simulated indoor, and then, a binary classifier determines whether AirTender is spilling oil or not. The detection is made with the help of the Yolo5 architecture, whereas the classification is carried out with the help of a suitably designed Convolutional Neural Network, OilNet40. In order to detect oil leaks more clearly, we dilute the oil in AirTender with a fluorescent dye with an excitation wavelength peak of approximately 390 nm. AirTender is then illuminated with suitable UV LEDs. The whole system is an attempt to design a low-cost detection setup. An on-board device, such as a mini-computer, is placed near the suspension system and connected to a full hd camera framing AirTender. The on-board device, through our Neural Network algorithm, is then able to localize and classify AirTender as normally functioning (non-leak image) or anomaly (leak image)., Comment: analysis of literature reviewed, n.2 figures added, minor corrections

Published
2022
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5. A measurement of the Higgs boson mass in the diphoton decay channel

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., and Wyslouch, Boleslaw

Abstract

© 2020 The Author(s) A measurement of the mass of the Higgs boson in the diphoton decay channel is presented. This analysis is based on 35.9fb−1 of proton-proton collision data collected during the 2016 LHC running period, with the CMS detector at a centre-of-mass energy of 13 TeV. A refined detector calibration and new analysis techniques have been used to improve the precision of this measurement. The Higgs boson mass is measured to be mH=125.78±0.26GeV. This is combined with a measurement of mH already performed in the H→ZZ→4ℓ decay channel using the same data set, giving mH=125.46±0.16GeV. This result, when further combined with an earlier measurement of mH using data collected in 2011 and 2012 with the CMS detector, gives a value for the Higgs boson mass of mH=125.38±0.14GeV. This is currently the most precise measurement of the mass of the Higgs boson.

Published
2022

6. Combined search for supersymmetry with photons in proton-proton collisions at √ s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, D., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, D., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., and Wyslouch, Boleslaw

Published
2022

7. Studies of Beauty Suppression via Nonprompt D 0 Mesons in Pb-Pb Collisions at √ s NN = 5.02 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., Wyslouch, Boleslaw, Shi, Zhaozhong, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., Wyslouch, Boleslaw, and Shi, Zhaozhong

Abstract

© 2019 CERN. The transverse momentum spectra of D0 mesons from b hadron decays are measured at midrapidity (|y|<1) in pp and Pb-Pb collisions at a nucleon-nucleon center of mass energy of 5.02 TeV with the CMS detector at the LHC. The D0 mesons from b hadron decays are distinguished from prompt D0 mesons by their decay topologies. In Pb-Pb collisions, the B?D0 yield is found to be suppressed in the measured pT range from 2 to 100 GeV/c as compared to pp collisions. The suppression is weaker than that of prompt D0 mesons and charged hadrons for pT around 10 GeV/c. While theoretical calculations incorporating partonic energy loss in the quark-gluon plasma can successfully describe the measured B?D0 suppression at higher pT, the data show an indication of larger suppression than the model predictions in the range of 2

Published
2022

8. Observation of the Production of Three Massive Gauge Bosons at √ s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, Chen, Y., D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Krupa, Jeffrey, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., Wang, Z., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, Chen, Y., D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Krupa, Jeffrey, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., Wang, Z., and Wyslouch, Boleslaw

Abstract

© 2020 CERN. The first observation is reported of the combined production of three massive gauge bosons (VVV with V=W, Z) in proton-proton collisions at a center-of-mass energy of 13 TeV. The analysis is based on a data sample recorded by the CMS experiment at the CERN LHC corresponding to an integrated luminosity of 137 fb-1. The searches for individual WWW, WWZ, WZZ, and ZZZ production are performed in final states with three, four, five, and six leptons (electrons or muons), or with two same-sign leptons plus one or two jets. The observed (expected) significance of the combined VVV production signal is 5.7 (5.9) standard deviations and the corresponding measured cross section relative to the standard model prediction is 1.02-0.23+0.26. The significances of the individual WWW and WWZ production are 3.3 and 3.4 standard deviations, respectively. Measured production cross sections for the individual triboson processes are also reported.

Published
2022

9. Combination of CMS searches for heavy resonances decaying to pairs of bosons or leptons

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., and Wyslouch, Boleslaw

Abstract

© 2019 The Author(s) A statistical combination of searches for heavy resonances decaying to pairs of bosons or leptons is presented. The data correspond to an integrated luminosity of 35.9 fb−1 collected during 2016 by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV. The data are found to be consistent with expectations from the standard model background. Exclusion limits are set in the context of models of spin-1 heavy vector triplets and of spin-2 bulk gravitons. For mass-degenerate W′ and Z′ resonances that predominantly couple to the standard model gauge bosons, the mass exclusion at 95% confidence level of heavy vector bosons is extended to 4.5 TeV as compared to 3.8 TeV determined from the best individual channel. This excluded mass increases to 5.0 TeV if the resonances couple predominantly to fermions.

Published
2022

10. Search for Physics beyond the Standard Model in Events with Overlapping Photons and Jets

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., and Wyslouch, Boleslaw

Abstract

© 2019 CERN. for the CMS Collaboration. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/" Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3 . Results are reported from a search for new particles that decay into a photon and two gluons, in events with jets. Novel jet substructure techniques are developed that allow photons to be identified in an environment densely populated with hadrons. The analyzed proton-proton collision data were collected by the CMS experiment at the LHC, in 2016 at s=13 TeV, and correspond to an integrated luminosity of 35.9 fb-1. The spectra of total transverse hadronic energy of candidate events are examined for deviations from the standard model predictions. No statistically significant excess is observed over the expected background. The first cross section limits on new physics processes resulting in such events are set. The results are interpreted as upper limits on the rate of gluino pair production, utilizing a simplified stealth supersymmetry model. The excluded gluino masses extend up to 1.7 TeV, for a neutralino mass of 200 GeV and exceed previous mass constraints set by analyses targeting events with isolated photons.

Published
2022

11. Search for new phenomena with the MT2 variable in the all-hadronic final state produced in proton–proton collisions at√s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hsu, David, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Y.S., Lee, Y.-J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hsu, David, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Y.S., Lee, Y.-J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., and Wyslouch, Boleslaw

Abstract

© 2017, CERN for the benefit of the CMS collaboration. A search for new phenomena is performed using events with jets and significant transverse momentum imbalance, as inferred through the MT 2variable. The results are based on a sample of proton–proton collisions collected in 2016 at a center-of-mass energy of 13TeV with the CMS detector and corresponding to an integrated luminosity of 35.9fb-1. No excess event yield is observed above the predicted standard model background, and the results are interpreted as exclusion limits at 95% confidence level on the masses of predicted particles in a variety of simplified models of R-parity conserving supersymmetry. Depending on the details of the model, 95% confidence level lower limits on the gluino (light-flavor squark) masses are placed up to 2025 (1550)GeV. Mass limits as high as 1070 (1175)GeV are set on the masses of top (bottom) squarks. Information is provided to enable re-interpretation of these results, including model-independent limits on the number of non-standard model events for a set of simplified, inclusive search regions.

Published
2022

12. Reinterpretation of LHC results for new physics: Status and recommendations after run 2

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The LCH BSM Reinterpretation Forum, Marini, Andrea Carlo, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The LCH BSM Reinterpretation Forum, and Marini, Andrea Carlo

Abstract

© 2020 SciPost Foundation. All right reserved We report on the status of efforts to improve the reinterpretation of searches and measurements at the LHC in terms of models for new physics, in the context of the LHC Reinterpretation Forum. We detail current experimental offerings in direct searches for new particles, measurements, technical implementations and Open Data, and provide a set of recommendations for further improving the presentation of LHC results in order to better enable reinterpretation in the future. We also provide a brief description of existing software reinterpretation frameworks and recent global analyses of new physics that make use of the current data.

Published
2022

13. Search for t ̄t resonances in highly boosted lepton+jets and fully hadronic final states in proton-proton collisions at √s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Apyan, Aram, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Bierwagen, Katharina, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hsu, David, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Y.S., Lee, Y.J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Apyan, Aram, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Bierwagen, Katharina, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hsu, David, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Y.S., Lee, Y.J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T.W., and Wyslouch, Boleslaw

Abstract

© 2017, The Author(s). A search for the production of heavy resonances decaying into top quark-antiquark pairs is presented. The analysis is performed in the lepton+jets and fully hadronic channels using data collected in proton-proton collisions at s=13 TeV using the CMS detector at the LHC, corresponding to an integrated luminosity of 2.6 fb−1. The selection is optimized for massive resonances, where the top quarks have large Lorentz boosts. No evidence for resonant t t ¯ production is found in the data, and upper limits on the production cross section of heavy resonances are set. The exclusion limits for resonances with masses above 2 TeV are significantly improved compared to those of previous analyses at s=8 TeV.[Figure not available: see fulltext.].

Published
2022

14. Measurements of the tt production cross section in lepton+jets final states in pp collisions at 8 TeV and ratio of 8 to 7 TeV cross sections

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Apyan, Aram, Barbieri, Richard Alexander, Baty, Austin Alan, Bierwagen, Katharina, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, Demiragli, Zeynep, Di Matteo, Leonardo, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Y.S., Lee, Y.-J., Levin, A., Luckey Jr, P David, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Ralph, D., Roland, Christof, Roland, Gunther, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Sumorok, Konstanty C, Varma, Mukund Madhav, Velicanu, Dragos Alexandru, Veverka, Jan, Wang, J., Wang, T.W., Wyslouch, Boleslaw, Yang, M., Zhukova, Victoria, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, The CMS Collaboration, Apyan, Aram, Barbieri, Richard Alexander, Baty, Austin Alan, Bierwagen, Katharina, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, Demiragli, Zeynep, Di Matteo, Leonardo, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Y.S., Lee, Y.-J., Levin, A., Luckey Jr, P David, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Ralph, D., Roland, Christof, Roland, Gunther, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Sumorok, Konstanty C, Varma, Mukund Madhav, Velicanu, Dragos Alexandru, Veverka, Jan, Wang, J., Wang, T.W., Wyslouch, Boleslaw, Yang, M., and Zhukova, Victoria

Abstract

© 2017, CERN for the benefit of the CMS collaboration. A measurement of the top quark pair production (tt¯) cross section in proton–proton collisions at the centre-of-mass energy of 8TeV is presented using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.6fb-1. This analysis is performed in the tt¯ decay channels with one isolated, high transverse momentum electron or muon and at least four jets, at least one of which is required to be identified as originating from hadronization of a b quark. The calibration of the jet energy scale and the efficiency of b jet identification are determined from data. The measured tt¯ cross section is 228.5±3.8(stat)±13.7(syst)±6.0(lumi) pb. This measurement is compared with an analysis of 7TeV data, corresponding to an integrated luminosity of 5.0fb-1, to determine the ratio of 8TeV to 7TeV cross sections, which is found to be 1.43±0.04(stat)±0.07(syst)±0.05(lumi). The measurements are in agreement with QCD predictions up to next-to-next-to-leading order.

Published
2022

15. La valutazione multidisciplinare nello squilibrio muscolare orofacciale

Author

Marini Andrea, Vicari Stefano, Ricci, Luigia, Zagari, Felicia, Grippaudo, Cristina, D’Alatri, Lucia, Zagari Felicia, Grippaudo Cristina (ORCID:0000-0002-9499-0556), D’Alatri Lucia (ORCID:0000-0003-3104-958X), Marini Andrea, Vicari Stefano, Ricci, Luigia, Zagari, Felicia, Grippaudo, Cristina, D’Alatri, Lucia, Zagari Felicia, Grippaudo Cristina (ORCID:0000-0002-9499-0556), and D’Alatri Lucia (ORCID:0000-0003-3104-958X)

Abstract

bambini e le bambine che per varie ragioni iniziano a parlare in ritardo non costituiscono casi isolati, ma rappresentano una percentuale numerosa all'interno della popolazione infantile. Frutto della collaborazione tra i principali studiosi e clinici del settore, questo manuale ripercorre le tappe di sviluppo della comunicazione e del linguaggio, indicando i periodi critici e le scelte educative che possono favorirne l'acquisizione. Fornisce inoltre gli strumenti più efficaci per una corretta diagnosi e, soprattutto, i principi per il trattamento del Disturbo di linguaggio sia esso Primario oppure associato ad altri eventuali disturbi evolutivi. Dopo una prima panoramica dei più recenti sviluppi teorici sulla natura della comunicazione e del linguaggio, vengono affrontati il problema del Disturbo Primario del Linguaggio (DPL) e, successivamente, i temi della diagnosi e del trattamento e i diversi fattori e contesti in cui i disturbi

Published
2022

16. Search for Low-Mass Quark-Antiquark Resonances Produced in Association with a Photon at √ s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., and Wyslouch, Boleslaw

Abstract

© 2019 CERN. for the CMS Collaboration. Published by the American Physical Society under the terms of the https://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. A search for narrow low-mass resonances decaying to quark-antiquark pairs is presented. The search is based on proton-proton collision events collected at 13 TeV by the CMS detector at the CERN LHC. The data sample corresponds to an integrated luminosity of 35.9 fb-1, recorded in 2016. The search considers the case where the resonance has high transverse momentum due to initial-state radiation of a hard photon. To study this process, the decay products of the resonance are reconstructed as a single large-radius jet with two-pronged substructure. The signal would be identified as a localized excess in the jet invariant mass spectrum. No evidence for such a resonance is observed in the mass range 10 to 125 GeV. Upper limits at the 95% confidence level are set on the coupling strength of resonances decaying to quark pairs. The results obtained with this photon trigger strategy provide the first direct constraints on quark-antiquark resonance masses below 50 GeV obtained at a hadron collider.

Published
2022

17. Search for dijet resonances using events with three jets in proton-proton collisions at √s=13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., and Wyslouch, Boleslaw

Abstract

© 2020 The Author(s) A search for a narrow resonance with a mass between 350 and 700 GeV, and decaying into a pair of jets, is performed using proton-proton collision events containing at least three jets. The data sample corresponds to an integrated luminosity of 18.3 fb−1 recorded at s=13TeV with the CMS detector. Data are collected with a technique known as “data scouting”, in which the events are reconstructed, selected, and recorded at a high rate in a compact form by the high-level trigger. The three-jet final state provides sensitivity to lower resonance masses than in previous searches using the data scouting technique. The spectrum of the dijet invariant mass, calculated from the two jets with the largest transverse momenta in the event, is used to search for a resonance. No significant excess over a smoothly falling background is found. Limits at 95% confidence level are set on the production cross section of a narrow dijet resonance and compared with the cross section of a vector dark matter mediator coupling to dark matter particles and quarks. Translating to a model where the narrow resonance interacts only with quarks, upper limits on this coupling range between 0.10 and 0.15, depending on the resonance mass. These results represent the most stringent upper limits in the mass range between 350 and 450 GeV obtained with a flavor-inclusive dijet resonance search.

Published
2022

18. Search for long-lived particles using delayed photons in proton-proton collisions at √ s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, M., Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, The CMS Collaboration, Abercrombie, Daniel Robert, Allen, Branden, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, M., Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., and Wyslouch, Boleslaw

Abstract

© 2019 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/" Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. A search for long-lived particles decaying to photons and weakly interacting particles, using proton-proton collision data at s=13 TeV collected by the CMS experiment in 2016-2017 is presented. The data set corresponds to an integrated luminosity of 77.4 fb-1. Results are interpreted in the context of supersymmetry with gauge-mediated supersymmetry breaking, where the neutralino is long-lived and decays to a photon and a gravitino. Limits are presented as a function of the neutralino proper decay length and mass. For neutralino proper decay lengths of 0.1, 1, 10, and 100 m, masses up to 320, 525, 360, and 215 GeV are excluded at 95% confidence level, respectively. We extend the previous best limits in the neutralino proper decay length by up to one order of magnitude, and in the neutralino mass by up to 100 GeV.

Published
2022

19. Time-Dependent Screening Explains the Ultrafast Excitonic Signal Rise in 2D Semiconductors

Author

Fonds National de la Recherche - FnR [sponsor], H2020 [sponsor], MINECO, Spain [sponsor], TU Wien [sponsor], Smejkal, Valerie, Libisch, Florian, Molina-Sanchez, Alejandro, Trovatello, Chiara, Wirtz, Ludger, Marini, Andrea, Fonds National de la Recherche - FnR [sponsor], H2020 [sponsor], MINECO, Spain [sponsor], TU Wien [sponsor], Smejkal, Valerie, Libisch, Florian, Molina-Sanchez, Alejandro, Trovatello, Chiara, Wirtz, Ludger, and Marini, Andrea

Abstract

We calculate the time evolution of the transient reflection signal in an MoS2 monolayer on a SiO2/Si substrate using first-principles out-of-equilibrium real-time methods. Our simulations provide a simple and intuitive physical picture for the delayed, yet ultrafast, evolution of the signal whose rise time depends on the excess energy of the pump laser: at laser energies above the A- and B-exciton, the pump pulse excites electrons and holes far away from the K valleys in the first Brillouin zone. Electron–phonon and hole–phonon scattering lead to a gradual relaxation of the carriers toward small Active Excitonic Regions around K, enhancing the dielectric screening. The accompanying time-dependent band gap renormalization dominates over Pauli blocking and the excitonic binding energy renormalization. This explains the delayed buildup of the transient reflection signal of the probe pulse, in excellent agreement with recent experimental data. Our results show that the observed delay is not a unique signature of an exciton formation process but rather caused by coordinated carrier dynamics and its influence on the screening.

Published
2021

20. Subpicosecond metamagnetic phase transition in FeRh driven by non-equilibrium electron dynamics

Author

Pressacco, Frederico, Sangalli, Davide, Uhlíř, Vojtěch, Kutnyakhov, Dmytro, Arregi Uribeetxebarria, Jon Ander, Agustsson, Steinn Ymir, Brenner, Günter, Redlin, Harald, Heber, Michael, Vasilyev, Dmitry, Demsar, Jure, Schönhense, Gerd, Gatti, Matteo, Marini, Andrea, Wurth, Wilfried, Sirotti, Fausto, Pressacco, Frederico, Sangalli, Davide, Uhlíř, Vojtěch, Kutnyakhov, Dmytro, Arregi Uribeetxebarria, Jon Ander, Agustsson, Steinn Ymir, Brenner, Günter, Redlin, Harald, Heber, Michael, Vasilyev, Dmitry, Demsar, Jure, Schönhense, Gerd, Gatti, Matteo, Marini, Andrea, Wurth, Wilfried, and Sirotti, Fausto

Abstract

In FeRh, it is possible to optically drive a phase transition between ferromagnetic (FM) and anti-ferromagnetic (AFM) ordering. Here, using a combination of photoelectron spectroscopy and ab-initio calculations, the authors demonstrate the existence of a transient intermediate phase, explaining the delayed appearance of the FM phase. Femtosecond light-induced phase transitions between different macroscopic orders provide the possibility to tune the functional properties of condensed matter on ultrafast timescales. In first-order phase transitions, transient non-equilibrium phases and inherent phase coexistence often preclude non-ambiguous detection of transition precursors and their temporal onset. Here, we present a study combining time-resolved photoelectron spectroscopy and ab-initio electron dynamics calculations elucidating the transient subpicosecond processes governing the photoinduced generation of ferromagnetic order in antiferromagnetic FeRh. The transient photoemission spectra are accounted for by assuming that not only the occupation of electronic states is modified during the photoexcitation process. Instead, the photo-generated non-thermal distribution of electrons modifies the electronic band structure. The ferromagnetic phase of FeRh, characterized by a minority band near the Fermi energy, is established 350 +/- 30 fs after the laser excitation. Ab-initio calculations indicate that the phase transition is initiated by a photoinduced Rh-to-Fe charge transfer.

Published
2021

21. Measurement of the inclusive jet cross section in pp collisions at √s = 2.76 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Apyan, Aram (mitid:990254442 orcidid:0000-0002-9418-6656), Barbieri, Richard Alexander (mitid:926376968 orcidid:0000-0002-7945-005X), Baty, Austin Alan (mitid:927689940 orcidid:0000-0001-5310-3466), Bierwagen, Katharina (mitid:919430400 orcidid:0000-0002-2622-8295), Brandt, Stephanie Akemi (mitid:925372731 orcidid:0000-0002-8590-2673), Busza, Wit (mitid:900029047 orcidid:0000-0002-3831-9071), Cali, Ivan Amos (mitid:929072489 orcidid:0000-0002-2822-3375), Demiragli, Zeynep (mitid:925613107 orcidid:0000-0001-8521-737X), Di Matteo, Leonardo (mitid:926336789 orcidid:), Gomez-Ceballos, Guillelmo (mitid:900058419 orcidid:), Goncharov, Maxim (mitid:920123471 orcidid:), Gulhan, Doga Can (mitid:928119038 orcidid:0000-0001-9236-6621), Iiyama, Yutaro (mitid:926598717 orcidid:0000-0002-8297-5930), Innocenti, Gian Michele (mitid:924481918 orcidid:0000-0003-4511-0855), Klute, Markus (mitid:925092044 orcidid:0000-0002-0869-5631), Kovalskyi, Dmytro (mitid:929909847 orcidid:0000-0002-6923-293X), Lai, Yue Shi (mitid:921858127 orcidid:0000-0003-1486-606X), Lee, Yen-Jie (mitid:921198475 orcidid:0000-0003-2593-7767), Levin, Andrew D. (mitid:924379938 orcidid:), Luckey Jr, P David (mitid:900021229 orcidid:), Marini, Andrea Carlo (mitid:920954941 orcidid:0000-0003-2351-0487), McGinn, Christopher Francis (mitid:923057666 orcidid:0000-0003-1281-0193), Mironov, Camelia Maria (mitid:929506802 orcidid:0000-0002-8599-2437), Narayanan, Siddharth Madhavan (mitid:922454357 orcidid:0000-0003-2723-3560), Niu, Xinmei (mitid:914786827 orcidid:0000-0001-7842-1591), Paus, Christoph M. E. (mitid:900047455 orcidid:0000-0002-6047-4211), Roland, Christof E (mitid:900051802 orcidid:), Salfeld-Nebgen, Jakob Maxillian Henry (mitid:912738899 orcidid:0000-0003-3879-5622), Sumorok, Konstanty C (mitid:900024832 orcidid:), Varma, Mukund Madhav (mitid:926116215 orcidid:0000-0001-8261-8346), Velicanu, Dragos Alexandru (mitid:995527803 orcidid:0000-0002-1260-777X), Wang, J., Wang, Ta-Wei (mitid:927303917 orcidid:0000-0002-0899-7621), Wyslouch, Boleslaw (mitid:900004890 orcidid:0000-0003-3681-0649), Yang, Mingming (mitid:976521792 orcidid:0000-0001-6332-5839), Wyslouch, Victoria (mitid:929268172 orcidid:), Khachatryan, V., Sirunyan, A. M, Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Erö, J., Friedl, M., Frühwirth, R., Ghete, V. M, Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., Knünz, V., König, A., Krammer, M., Krätschmer, I., Liko, D., Matsushita, T., Mikulec, I., Rabady, D., Rahbaran, B., Rohringer, H., Schieck, J., Schöfbeck, R., Strauss, J., Treberer-Treberspurg, W., Waltenberger, W., Wulz, C., Mossolov, V., Shumeiko, N., Suarez Gonzalez, J., Alderweireldt, S., Cornelis, T., De Wolf, E. A, Janssen, X., Knutsson, A., Lauwers, J., Luyckx, S., Van De Klundert, M., Van Haevermaet, H., Van Mechelen, P., Van Remortel, N., Van Spilbeeck, A., Abu Zeid, S., Blekman, F., D’Hondt, J., Daci, N., De Bruyn, I., Deroover, K., Heracleous, N., Keaveney, J., Lowette, S., Moreels, L., Olbrechts, A., Python, Q., Strom, D., Tavernier, S., Van Doninck, W., Van Mulders, P., Van Onsem, G. P, Van Parijs, I., Barria, P., Brun, H., Caillol, C., Clerbaux, B., De Lentdecker, G., Fasanella, G., Favart, L., Goldouzian, R., Grebenyuk, A., Karapostoli, G., Lenzi, T., Léonard, A., Maerschalk, T., Marinov, A., Perniè, L., Randle-conde, A., Seva, T., Vander Velde, C., Yonamine, R., Vanlaer, P., Zenoni, F., Zhang, F., Adler, V., Beernaert, K., Benucci, L., Cimmino, A., Crucy, S., Dobur, D., Fagot, A., Garcia, G., Gul, M., Mccartin, J., Ocampo Rios, A. A, Poyraz, D., Ryckbosch, D., Salva, S., Sigamani, M., Tytgat, M., Van Driessche, W., Yazgan, E., Zaganidis, N., Basegmez, S., Beluffi, C., Bondu, O., Brochet, S., Bruno, G., Caudron, A., Ceard, L., Delaere, C., Favart, D., Forthomme, L., Giammanco, A., Jafari, A., Jez, P., Komm, M., Lemaitre, V., Mertens, A., Musich, M., Nuttens, C., Perrini, L., Piotrzkowski, K., Popov, A., Quertenmont, L., Selvaggi, M., Vidal Marono, M., Beliy, N., Hammad, G. H, Júnior, W. L A, Alves, F. L, Alves, G. A, Brito, L., Correa Martins Junior, M., Hamer, M., Hensel, C., Moraes, A., Pol, M. E, Rebello Teles, P., Belchior Batista Das Chagas, E., Carvalho, W., Chinellato, J., Custódio, A., Da Costa, E. M, De Jesus Damiao, D., De Oliveira Martins, C., Fonseca De Souza, S., Huertas Guativa, L. M, Malbouisson, H., Matos Figueiredo, D., Mora Herrera, C., Mundim, L., Nogima, H., Prado Da Silva, W. L, Santoro, A., Sznajder, A., Tonelli Manganote, E. J, Vilela Pereira, A., Ahuja, S., Bernardes, C. A, De Souza Santos, A., Dogra, S., Fernandez Perez Tomei, T. R, Gregores, E. M, Mercadante, P. G, Moon, C. S, Novaes, S. F, Padula, Sandra S, Romero Abad, D., Ruiz Vargas, J. C, Aleksandrov, A., Hadjiiska, R., Iaydjiev, P., Rodozov, M., Stoykova, S., Sultanov, G., Vutova, M., Dimitrov, A., Glushkov, I., Litov, L., Pavlov, B., Petkov, P., Ahmad, M., Bian, J. G, Chen, G. M, Chen, H. S, Chen, M., Cheng, T., Du, R., Jiang, C. H, Plestina, R., Romeo, F., Shaheen, S. M, Spiezia, A., Tao, J., Wang, C., Wang, Z., Zhang, H., Asawatangtrakuldee, C., Ban, Y., Li, Q., Liu, S., Mao, Y., Qian, S. J, Wang, D., Xu, Z., Avila, C., Cabrera, A., Chaparro Sierra, L. F, Florez, C., Gomez, J. P, Gomez Moreno, B., Sanabria, J. C, Godinovic, N., Lelas, D., Puljak, I., Ribeiro Cipriano, P. M, Antunovic, Z., Kovac, M., Brigljevic, V., Kadija, K., Luetic, J., Micanovic, S., Sudic, L., Attikis, A., Mavromanolakis, G., Mousa, J., Nicolaou, C., Ptochos, F., Razis, P. A, Rykaczewski, H., Bodlak, M., Finger, M., El-khateeb, E., Elkafrawy, T., Mohamed, A., Salama, E., Calpas, B., Kadastik, M., Murumaa, M., Raidal, M., Tiko, A., Veelken, C., Eerola, P., Pekkanen, J., Voutilainen, M., Härkönen, J., Karimäki, V., Kinnunen, R., Lampén, T., Lassila-Perini, K., Lehti, S., Lindén, T., Luukka, P., Peltola, T., Tuominen, E., Tuominiemi, J., Tuovinen, E., Wendland, L., Talvitie, J., Tuuva, T., Besancon, M., Couderc, F., Dejardin, M., Denegri, D., Fabbro, B., Faure, J. L, Favaro, C., Ferri, F., Ganjour, S., Givernaud, A., Gras, P., Hamel de Monchenault, G., Jarry, P., Locci, E., Machet, M., Malcles, J., Rander, J., Rosowsky, A., Titov, M., Zghiche, A., Antropov, I., Baffioni, S., Beaudette, F., Busson, P., Cadamuro, L., Chapon, E., Charlot, C., Davignon, O., Filipovic, N., Granier de Cassagnac, R., Jo, M., Lisniak, S., Mastrolorenzo, L., Miné, P., Naranjo, I. N, Nguyen, M., Ochando, C., Ortona, G., Paganini, P., Pigard, P., Regnard, S., Salerno, R., Sauvan, J. B, Sirois, Y., Strebler, T., Yilmaz, Y., Zabi, A., Agram, J.-L., Andrea, J., Aubin, A., Bloch, D., Brom, J.-M., Buttignol, M., Chabert, E. C, Chanon, N., Collard, C., Conte, E., Coubez, X., Fontaine, J.-C., Gelé, D., Goerlach, U., Goetzmann, C., Le Bihan, A.-C., Merlin, J. A, Skovpen, K., Van Hove, P., Gadrat, S., Beauceron, S., Bernet, C., Boudoul, G., Bouvier, E., Carrillo Montoya, C. A, Chierici, R., Contardo, D., Courbon, B., Depasse, P., El Mamouni, H., Fan, J., Fay, J., Gascon, S., Gouzevitch, M., Ille, B., Lagarde, F., Laktineh, I. B, Lethuillier, M., Mirabito, L., Pequegnot, A. L, Perries, S., Ruiz Alvarez, J. D, Sabes, D., Sgandurra, L., Sordini, V., Vander Donckt, M., Verdier, P., Viret, S., Toriashvili, T., Tsamalaidze, Z., Autermann, C., Beranek, S., Feld, L., Heister, A., Kiesel, M. K, Klein, K., Lipinski, M., Ostapchuk, A., Preuten, M., Raupach, F., Schael, S., Schulte, J. F, Verlage, T., Weber, H., Zhukov, V., Ata, M., Brodski, M., Dietz-Laursonn, E., Duchardt, D., Endres, M., Erdmann, M., Erdweg, S., Esch, T., Fischer, R., Güth, A., Hebbeker, T., Heidemann, C., Hoepfner, K., Knutzen, S., Kreuzer, P., Merschmeyer, M., Meyer, A., Millet, P., Mukherjee, S., Olschewski, M., Padeken, K., Papacz, P., Pook, T., Radziej, M., Reithler, H., Rieger, M., Scheuch, F., Sonnenschein, L., Teyssier, D., Thüer, S., Cherepanov, V., Erdogan, Y., Flügge, G., Geenen, H., Geisler, M., Hoehle, F., Kargoll, B., Kress, T., Künsken, A., Lingemann, J., Nehrkorn, A., Nowack, A., Nugent, I. M, Pistone, C., Pooth, O., Stahl, A., Aldaya Martin, M., Asin, I., Bartosik, N., Behnke, O., Behrens, U., Borras, K., Burgmeier, A., Campbell, A., Contreras-Campana, C., Costanza, F., Diez Pardos, C., Dolinska, G., Dooling, S., Dorland, T., Eckerlin, G., Eckstein, D., Eichhorn, T., Flucke, G., Gallo, E., Garcia, J. G, Geiser, A., Gizhko, A., Gunnellini, P., Hauk, J., Hempel, M., Jung, H., Kalogeropoulos, A., Karacheban, O., Kasemann, M., Katsas, P., Kieseler, J., Kleinwort, C., Korol, I., Lange, W., Leonard, J., Lipka, K., Lobanov, A., Lohmann, W., Mankel, R., Melzer-Pellmann, I.-A., Meyer, A. B, Mittag, G., Mnich, J., Mussgiller, A., Naumann-Emme, S., Nayak, A., Ntomari, E., Perrey, H., Pitzl, D., Placakyte, R., Raspereza, A., Roland, B., Sahin, M. Ö, Saxena, P., Schoerner-Sadenius, T., Seitz, C., Spannagel, S., Trippkewitz, K. D, Walsh, R., Wissing, C., Blobel, V., Centis Vignali, M., Draeger, A. R, Erfle, J., Garutti, E., Goebel, K., Gonzalez, D., Görner, M., Haller, J., Hoffmann, M., Höing, R. S, Junkes, A., Klanner, R., Kogler, R., Kovalchuk, N., Lapsien, T., Lenz, T., Marchesini, I., Marconi, D., Meyer, M., Nowatschin, D., Ott, J., Pantaleo, F., Peiffer, T., Perieanu, A., Pietsch, N., Poehlsen, J., Rathjens, D., Sander, C., Scharf, C., Schleper, P., Schlieckau, E., Schmidt, A., Schumann, S., Schwandt, J., Sola, V., Stadie, H., Steinbrück, G., Stober, F. M, Tholen, H., Troendle, D., Usai, E., Vanelderen, L., Vanhoefer, A., Vormwald, B., Barth, C., Baus, C., Berger, J., Böser, C., Butz, E., Chwalek, T., Colombo, F., De Boer, W., Descroix, A., Dierlamm, A., Fink, S., Frensch, F., Friese, R., Giffels, M., Gilbert, A., Haitz, D., Hartmann, F., Heindl, S. M, Husemann, U., Katkov, I., Kornmayer, A., Lobelle Pardo, P., Maier, B., Mildner, H., Mozer, M. U, Müller, T., Müller, Th., Plagge, M., Quast, G., Rabbertz, K., Röcker, S., Roscher, F., Schröder, M., Sieber, G., Simonis, H. 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R, Alyari, M., Dolen, J., George, J., Godshalk, A., Harrington, C., Iashvili, I., Kaisen, J., Kharchilava, A., Kumar, A., Rappoccio, S., Roozbahani, B., Alverson, G., Barberis, E., Baumgartel, D., Chasco, M., Hortiangtham, A., Massironi, A., Morse, D. M, Nash, D., Orimoto, T., Teixeira De Lima, R., Trocino, D., Wang, R.-J., Wood, D., Zhang, J., Hahn, K. A, Kubik, A., Low, J. F, Mucia, N., Odell, N., Pollack, B., Schmitt, M., Sung, K., Trovato, M., Velasco, M., Brinkerhoff, A., Dev, N., Hildreth, M., Jessop, C., Karmgard, D. J, Kellams, N., Lannon, K., Marinelli, N., Meng, F., Mueller, C., Musienko, Y., Planer, M., Reinsvold, A., Ruchti, R., Smith, G., Taroni, S., Valls, N., Wayne, M., Wolf, M., Woodard, A., Antonelli, L., Brinson, J., Bylsma, B., Durkin, L. S, Flowers, S., Hart, A., Hill, C., Hughes, R., Ji, W., Ling, T. Y, Liu, B., Luo, W., Puigh, D., Rodenburg, M., Winer, B. L, Wulsin, H. W, Driga, O., Elmer, P., Hardenbrook, J., Hebda, P., Koay, S. A, Lujan, P., Marlow, D., Medvedeva, T., Mooney, M., Olsen, J., Palmer, C., Piroué, P., Saka, H., Stickland, D., Tully, C., Zuranski, A., Barker, A., Barnes, V. E, Benedetti, D., Bortoletto, D., Gutay, L., Jha, M. K, Jones, M., Jung, A. W, Jung, K., Miller, D. H, Neumeister, N., Radburn-Smith, B. C, Shi, X., Shipsey, I., Silvers, D., Sun, J., Svyatkovskiy, A., Wang, F., Xie, W., Xu, L., Parashar, N., Stupak, J., Adair, A., Akgun, B., Chen, Z., Ecklund, K. M, Geurts, F. J M, Guilbaud, M., Li, W., Michlin, B., Northup, M., Padley, B. P, Redjimi, R., Roberts, J., Rorie, J., Tu, Z., Zabel, J., Betchart, B., Bodek, A., de Barbaro, P., Demina, R., Eshaq, Y., Ferbel, T., Galanti, M., Garcia-Bellido, A., Han, J., Harel, A., Hindrichs, O., Khukhunaishvili, A., Petrillo, G., Tan, P., Verzetti, M., Chou, J. P, Contreras-Campana, E., Ferencek, D., Gershtein, Y., Halkiadakis, E., Hidas, D., Hughes, E., Kaplan, S., Kunnawalkam Elayavalli, R., Lath, A., Nash, K., Salur, S., Schnetzer, S., Sheffield, D., Somalwar, S., Stone, R., Thomas, S., Thomassen, P., Walker, M., Foerster, M., Riley, G., Rose, K., Spanier, S., Bouhali, O., Castaneda Hernandez, A., Celik, A., Dalchenko, M., De Mattia, M., Delgado, A., Dildick, S., Eusebi, R., Gilmore, J., Huang, T., Kamon, T., Krutelyov, V., Mueller, R., Osipenkov, I., Pakhotin, Y., Patel, R., Perloff, A., Safonov, A., Tatarinov, A., Ulmer, K. A, Akchurin, N., Cowden, C., Damgov, J., Dragoiu, C., Dudero, P. R, Faulkner, J., Kunori, S., Lamichhane, K., Lee, S. W, Libeiro, T., Undleeb, S., Volobouev, I., Appelt, E., Delannoy, A. G, Greene, S., Gurrola, A., Janjam, R., Johns, W., Maguire, C., Melo, A., Ni, H., Sheldon, P., Tuo, S., Velkovska, J., Xu, Q., Arenton, M. W, Cox, B., Francis, B., Goodell, J., Hirosky, R., Ledovskoy, A., Li, H., Lin, C., Neu, C., Sinthuprasith, T, Sun, X., Wang, Y., Wolfe, E., Wood, J., Xia, F., Clarke, C., Harr, R., Karchin, P. E, Kottachchi Kankanamge Don, C., Lamichhane, P., Sturdy, J., Belknap, D. A, Carlsmith, D., Cepeda, M., Dasu, S., Dodd, L., Duric, S., Gomber, B., Grothe, M., Hall-Wilton, R., Herndon, M., Hervé, A., Klabbers, P., Lanaro, A., Levine, A., Long, K., Loveless, R., Mohapatra, A., Ojalvo, I., Perry, T., Pierro, G. A, Polese, G., Ruggles, T., Sarangi, T., Savin, A., Smith, N., Smith, W. H, Taylor, D., Verwilligen, P., Woods, N., Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Apyan, Aram (mitid:990254442 orcidid:0000-0002-9418-6656), Barbieri, Richard Alexander (mitid:926376968 orcidid:0000-0002-7945-005X), Baty, Austin Alan (mitid:927689940 orcidid:0000-0001-5310-3466), Bierwagen, Katharina (mitid:919430400 orcidid:0000-0002-2622-8295), Brandt, Stephanie Akemi (mitid:925372731 orcidid:0000-0002-8590-2673), Busza, Wit (mitid:900029047 orcidid:0000-0002-3831-9071), Cali, Ivan Amos (mitid:929072489 orcidid:0000-0002-2822-3375), Demiragli, Zeynep (mitid:925613107 orcidid:0000-0001-8521-737X), Di Matteo, Leonardo (mitid:926336789 orcidid:), Gomez-Ceballos, Guillelmo (mitid:900058419 orcidid:), Goncharov, Maxim (mitid:920123471 orcidid:), Gulhan, Doga Can (mitid:928119038 orcidid:0000-0001-9236-6621), Iiyama, Yutaro (mitid:926598717 orcidid:0000-0002-8297-5930), Innocenti, Gian Michele (mitid:924481918 orcidid:0000-0003-4511-0855), Klute, Markus (mitid:925092044 orcidid:0000-0002-0869-5631), Kovalskyi, Dmytro (mitid:929909847 orcidid:0000-0002-6923-293X), Lai, Yue Shi (mitid:921858127 orcidid:0000-0003-1486-606X), Lee, Yen-Jie (mitid:921198475 orcidid:0000-0003-2593-7767), Levin, Andrew D. (mitid:924379938 orcidid:), Luckey Jr, P David (mitid:900021229 orcidid:), Marini, Andrea Carlo (mitid:920954941 orcidid:0000-0003-2351-0487), McGinn, Christopher Francis (mitid:923057666 orcidid:0000-0003-1281-0193), Mironov, Camelia Maria (mitid:929506802 orcidid:0000-0002-8599-2437), Narayanan, Siddharth Madhavan (mitid:922454357 orcidid:0000-0003-2723-3560), Niu, Xinmei (mitid:914786827 orcidid:0000-0001-7842-1591), Paus, Christoph M. E. (mitid:900047455 orcidid:0000-0002-6047-4211), Roland, Christof E (mitid:900051802 orcidid:), Salfeld-Nebgen, Jakob Maxillian Henry (mitid:912738899 orcidid:0000-0003-3879-5622), Sumorok, Konstanty C (mitid:900024832 orcidid:), Varma, Mukund Madhav (mitid:926116215 orcidid:0000-0001-8261-8346), Velicanu, Dragos Alexandru (mitid:995527803 orcidid:0000-0002-1260-777X), Wang, J., Wang, Ta-Wei (mitid:927303917 orcidid:0000-0002-0899-7621), Wyslouch, Boleslaw (mitid:900004890 orcidid:0000-0003-3681-0649), Yang, Mingming (mitid:976521792 orcidid:0000-0001-6332-5839), Wyslouch, Victoria (mitid:929268172 orcidid:), Khachatryan, V., Sirunyan, A. M, Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., Brondolin, E., Dragicevic, M., Erö, J., Friedl, M., Frühwirth, R., Ghete, V. M, Hartl, C., Hörmann, N., Hrubec, J., Jeitler, M., Knünz, V., König, A., Krammer, M., Krätschmer, I., Liko, D., Matsushita, T., Mikulec, I., Rabady, D., Rahbaran, B., Rohringer, H., Schieck, J., Schöfbeck, R., Strauss, J., Treberer-Treberspurg, W., Waltenberger, W., Wulz, C., Mossolov, V., Shumeiko, N., Suarez Gonzalez, J., Alderweireldt, S., Cornelis, T., De Wolf, E. A, Janssen, X., Knutsson, A., Lauwers, J., Luyckx, S., Van De Klundert, M., Van Haevermaet, H., Van Mechelen, P., Van Remortel, N., Van Spilbeeck, A., Abu Zeid, S., Blekman, F., D’Hondt, J., Daci, N., De Bruyn, I., Deroover, K., Heracleous, N., Keaveney, J., Lowette, S., Moreels, L., Olbrechts, A., Python, Q., Strom, D., Tavernier, S., Van Doninck, W., Van Mulders, P., Van Onsem, G. P, Van Parijs, I., Barria, P., Brun, H., Caillol, C., Clerbaux, B., De Lentdecker, G., Fasanella, G., Favart, L., Goldouzian, R., Grebenyuk, A., Karapostoli, G., Lenzi, T., Léonard, A., Maerschalk, T., Marinov, A., Perniè, L., Randle-conde, A., Seva, T., Vander Velde, C., Yonamine, R., Vanlaer, P., Zenoni, F., Zhang, F., Adler, V., Beernaert, K., Benucci, L., Cimmino, A., Crucy, S., Dobur, D., Fagot, A., Garcia, G., Gul, M., Mccartin, J., Ocampo Rios, A. A, Poyraz, D., Ryckbosch, D., Salva, S., Sigamani, M., Tytgat, M., Van Driessche, W., Yazgan, E., Zaganidis, N., Basegmez, S., Beluffi, C., Bondu, O., Brochet, S., Bruno, G., Caudron, A., Ceard, L., Delaere, C., Favart, D., Forthomme, L., Giammanco, A., Jafari, A., Jez, P., Komm, M., Lemaitre, V., Mertens, A., Musich, M., Nuttens, C., Perrini, L., Piotrzkowski, K., Popov, A., Quertenmont, L., Selvaggi, M., Vidal Marono, M., Beliy, N., Hammad, G. H, Júnior, W. L A, Alves, F. L, Alves, G. A, Brito, L., Correa Martins Junior, M., Hamer, M., Hensel, C., Moraes, A., Pol, M. E, Rebello Teles, P., Belchior Batista Das Chagas, E., Carvalho, W., Chinellato, J., Custódio, A., Da Costa, E. M, De Jesus Damiao, D., De Oliveira Martins, C., Fonseca De Souza, S., Huertas Guativa, L. M, Malbouisson, H., Matos Figueiredo, D., Mora Herrera, C., Mundim, L., Nogima, H., Prado Da Silva, W. L, Santoro, A., Sznajder, A., Tonelli Manganote, E. J, Vilela Pereira, A., Ahuja, S., Bernardes, C. A, De Souza Santos, A., Dogra, S., Fernandez Perez Tomei, T. R, Gregores, E. M, Mercadante, P. G, Moon, C. S, Novaes, S. F, Padula, Sandra S, Romero Abad, D., Ruiz Vargas, J. C, Aleksandrov, A., Hadjiiska, R., Iaydjiev, P., Rodozov, M., Stoykova, S., Sultanov, G., Vutova, M., Dimitrov, A., Glushkov, I., Litov, L., Pavlov, B., Petkov, P., Ahmad, M., Bian, J. G, Chen, G. M, Chen, H. S, Chen, M., Cheng, T., Du, R., Jiang, C. H, Plestina, R., Romeo, F., Shaheen, S. M, Spiezia, A., Tao, J., Wang, C., Wang, Z., Zhang, H., Asawatangtrakuldee, C., Ban, Y., Li, Q., Liu, S., Mao, Y., Qian, S. J, Wang, D., Xu, Z., Avila, C., Cabrera, A., Chaparro Sierra, L. F, Florez, C., Gomez, J. P, Gomez Moreno, B., Sanabria, J. C, Godinovic, N., Lelas, D., Puljak, I., Ribeiro Cipriano, P. M, Antunovic, Z., Kovac, M., Brigljevic, V., Kadija, K., Luetic, J., Micanovic, S., Sudic, L., Attikis, A., Mavromanolakis, G., Mousa, J., Nicolaou, C., Ptochos, F., Razis, P. A, Rykaczewski, H., Bodlak, M., Finger, M., El-khateeb, E., Elkafrawy, T., Mohamed, A., Salama, E., Calpas, B., Kadastik, M., Murumaa, M., Raidal, M., Tiko, A., Veelken, C., Eerola, P., Pekkanen, J., Voutilainen, M., Härkönen, J., Karimäki, V., Kinnunen, R., Lampén, T., Lassila-Perini, K., Lehti, S., Lindén, T., Luukka, P., Peltola, T., Tuominen, E., Tuominiemi, J., Tuovinen, E., Wendland, L., Talvitie, J., Tuuva, T., Besancon, M., Couderc, F., Dejardin, M., Denegri, D., Fabbro, B., Faure, J. 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A, Chierici, R., Contardo, D., Courbon, B., Depasse, P., El Mamouni, H., Fan, J., Fay, J., Gascon, S., Gouzevitch, M., Ille, B., Lagarde, F., Laktineh, I. B, Lethuillier, M., Mirabito, L., Pequegnot, A. L, Perries, S., Ruiz Alvarez, J. D, Sabes, D., Sgandurra, L., Sordini, V., Vander Donckt, M., Verdier, P., Viret, S., Toriashvili, T., Tsamalaidze, Z., Autermann, C., Beranek, S., Feld, L., Heister, A., Kiesel, M. K, Klein, K., Lipinski, M., Ostapchuk, A., Preuten, M., Raupach, F., Schael, S., Schulte, J. F, Verlage, T., Weber, H., Zhukov, V., Ata, M., Brodski, M., Dietz-Laursonn, E., Duchardt, D., Endres, M., Erdmann, M., Erdweg, S., Esch, T., Fischer, R., Güth, A., Hebbeker, T., Heidemann, C., Hoepfner, K., Knutzen, S., Kreuzer, P., Merschmeyer, M., Meyer, A., Millet, P., Mukherjee, S., Olschewski, M., Padeken, K., Papacz, P., Pook, T., Radziej, M., Reithler, H., Rieger, M., Scheuch, F., Sonnenschein, L., Teyssier, D., Thüer, S., Cherepanov, V., Erdogan, Y., Flügge, G., Geenen, H., Geisler, M., Hoehle, F., Kargoll, B., Kress, T., Künsken, A., Lingemann, J., Nehrkorn, A., Nowack, A., Nugent, I. M, Pistone, C., Pooth, O., Stahl, A., Aldaya Martin, M., Asin, I., Bartosik, N., Behnke, O., Behrens, U., Borras, K., Burgmeier, A., Campbell, A., Contreras-Campana, C., Costanza, F., Diez Pardos, C., Dolinska, G., Dooling, S., Dorland, T., Eckerlin, G., Eckstein, D., Eichhorn, T., Flucke, G., Gallo, E., Garcia, J. G, Geiser, A., Gizhko, A., Gunnellini, P., Hauk, J., Hempel, M., Jung, H., Kalogeropoulos, A., Karacheban, O., Kasemann, M., Katsas, P., Kieseler, J., Kleinwort, C., Korol, I., Lange, W., Leonard, J., Lipka, K., Lobanov, A., Lohmann, W., Mankel, R., Melzer-Pellmann, I.-A., Meyer, A. B, Mittag, G., Mnich, J., Mussgiller, A., Naumann-Emme, S., Nayak, A., Ntomari, E., Perrey, H., Pitzl, D., Placakyte, R., Raspereza, A., Roland, B., Sahin, M. Ö, Saxena, P., Schoerner-Sadenius, T., Seitz, C., Spannagel, S., Trippkewitz, K. D, Walsh, R., Wissing, C., Blobel, V., Centis Vignali, M., Draeger, A. R, Erfle, J., Garutti, E., Goebel, K., Gonzalez, D., Görner, M., Haller, J., Hoffmann, M., Höing, R. S, Junkes, A., Klanner, R., Kogler, R., Kovalchuk, N., Lapsien, T., Lenz, T., Marchesini, I., Marconi, D., Meyer, M., Nowatschin, D., Ott, J., Pantaleo, F., Peiffer, T., Perieanu, A., Pietsch, N., Poehlsen, J., Rathjens, D., Sander, C., Scharf, C., Schleper, P., Schlieckau, E., Schmidt, A., Schumann, S., Schwandt, J., Sola, V., Stadie, H., Steinbrück, G., Stober, F. M, Tholen, H., Troendle, D., Usai, E., Vanelderen, L., Vanhoefer, A., Vormwald, B., Barth, C., Baus, C., Berger, J., Böser, C., Butz, E., Chwalek, T., Colombo, F., De Boer, W., Descroix, A., Dierlamm, A., Fink, S., Frensch, F., Friese, R., Giffels, M., Gilbert, A., Haitz, D., Hartmann, F., Heindl, S. M, Husemann, U., Katkov, I., Kornmayer, A., Lobelle Pardo, P., Maier, B., Mildner, H., Mozer, M. U, Müller, T., Müller, Th., Plagge, M., Quast, G., Rabbertz, K., Röcker, S., Roscher, F., Schröder, M., Sieber, G., Simonis, H. 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P, Majumder, D., Malek, M., Murray, M., Sanders, S., Stringer, R., Wang, Q., Ivanov, A., Kaadze, K., Khalil, S., Makouski, M., Maravin, Y., Mohammadi, A., Saini, L. K, Skhirtladze, N., Toda, S., Lange, D., Rebassoo, F., Wright, D., Anelli, C., Baden, A., Baron, O., Belloni, A., Calvert, B., Eno, S. C, Ferraioli, C., Gomez, J. A, Hadley, N. J, Jabeen, S., Kellogg, R. G, Kolberg, T., Kunkle, J., Lu, Y., Mignerey, A. C, Shin, Y. H, Skuja, A., Tonjes, M. B, Tonwar, S. C, Dahmes, B., Evans, A., Finkel, A., Gude, A., Hansen, P., Kalafut, S., Kao, S. C, Klapoetke, K., Kubota, Y., Lesko, Z., Mans, J., Nourbakhsh, S., Ruckstuhl, N., Rusack, R., Tambe, N., Turkewitz, J., Acosta, J. G, Oliveros, S., Avdeeva, E., Bartek, R, Bloom, K., Bose, S., Claes, D. R, Dominguez, A., Fangmeier, C., Gonzalez Suarez, R., Kamalieddin, R., Knowlton, D., Kravchenko, I., Meier, F., Monroy, J., Ratnikov, F., Siado, J. E, Snow, G. R, Alyari, M., Dolen, J., George, J., Godshalk, A., Harrington, C., Iashvili, I., Kaisen, J., Kharchilava, A., Kumar, A., Rappoccio, S., Roozbahani, B., Alverson, G., Barberis, E., Baumgartel, D., Chasco, M., Hortiangtham, A., Massironi, A., Morse, D. M, Nash, D., Orimoto, T., Teixeira De Lima, R., Trocino, D., Wang, R.-J., Wood, D., Zhang, J., Hahn, K. A, Kubik, A., Low, J. F, Mucia, N., Odell, N., Pollack, B., Schmitt, M., Sung, K., Trovato, M., Velasco, M., Brinkerhoff, A., Dev, N., Hildreth, M., Jessop, C., Karmgard, D. J, Kellams, N., Lannon, K., Marinelli, N., Meng, F., Mueller, C., Musienko, Y., Planer, M., Reinsvold, A., Ruchti, R., Smith, G., Taroni, S., Valls, N., Wayne, M., Wolf, M., Woodard, A., Antonelli, L., Brinson, J., Bylsma, B., Durkin, L. S, Flowers, S., Hart, A., Hill, C., Hughes, R., Ji, W., Ling, T. Y, Liu, B., Luo, W., Puigh, D., Rodenburg, M., Winer, B. L, Wulsin, H. W, Driga, O., Elmer, P., Hardenbrook, J., Hebda, P., Koay, S. A, Lujan, P., Marlow, D., Medvedeva, T., Mooney, M., Olsen, J., Palmer, C., Piroué, P., Saka, H., Stickland, D., Tully, C., Zuranski, A., Barker, A., Barnes, V. E, Benedetti, D., Bortoletto, D., Gutay, L., Jha, M. K, Jones, M., Jung, A. W, Jung, K., Miller, D. H, Neumeister, N., Radburn-Smith, B. C, Shi, X., Shipsey, I., Silvers, D., Sun, J., Svyatkovskiy, A., Wang, F., Xie, W., Xu, L., Parashar, N., Stupak, J., Adair, A., Akgun, B., Chen, Z., Ecklund, K. M, Geurts, F. J M, Guilbaud, M., Li, W., Michlin, B., Northup, M., Padley, B. P, Redjimi, R., Roberts, J., Rorie, J., Tu, Z., Zabel, J., Betchart, B., Bodek, A., de Barbaro, P., Demina, R., Eshaq, Y., Ferbel, T., Galanti, M., Garcia-Bellido, A., Han, J., Harel, A., Hindrichs, O., Khukhunaishvili, A., Petrillo, G., Tan, P., Verzetti, M., Chou, J. P, Contreras-Campana, E., Ferencek, D., Gershtein, Y., Halkiadakis, E., Hidas, D., Hughes, E., Kaplan, S., Kunnawalkam Elayavalli, R., Lath, A., Nash, K., Salur, S., Schnetzer, S., Sheffield, D., Somalwar, S., Stone, R., Thomas, S., Thomassen, P., Walker, M., Foerster, M., Riley, G., Rose, K., Spanier, S., Bouhali, O., Castaneda Hernandez, A., Celik, A., Dalchenko, M., De Mattia, M., Delgado, A., Dildick, S., Eusebi, R., Gilmore, J., Huang, T., Kamon, T., Krutelyov, V., Mueller, R., Osipenkov, I., Pakhotin, Y., Patel, R., Perloff, A., Safonov, A., Tatarinov, A., Ulmer, K. A, Akchurin, N., Cowden, C., Damgov, J., Dragoiu, C., Dudero, P. R, Faulkner, J., Kunori, S., Lamichhane, K., Lee, S. W, Libeiro, T., Undleeb, S., Volobouev, I., Appelt, E., Delannoy, A. G, Greene, S., Gurrola, A., Janjam, R., Johns, W., Maguire, C., Melo, A., Ni, H., Sheldon, P., Tuo, S., Velkovska, J., Xu, Q., Arenton, M. W, Cox, B., Francis, B., Goodell, J., Hirosky, R., Ledovskoy, A., Li, H., Lin, C., Neu, C., Sinthuprasith, T, Sun, X., Wang, Y., Wolfe, E., Wood, J., Xia, F., Clarke, C., Harr, R., Karchin, P. E, Kottachchi Kankanamge Don, C., Lamichhane, P., Sturdy, J., Belknap, D. A, Carlsmith, D., Cepeda, M., Dasu, S., Dodd, L., Duric, S., Gomber, B., Grothe, M., Hall-Wilton, R., Herndon, M., Hervé, A., Klabbers, P., Lanaro, A., Levine, A., Long, K., Loveless, R., Mohapatra, A., Ojalvo, I., Perry, T., Pierro, G. A, Polese, G., Ruggles, T., Sarangi, T., Savin, A., Smith, N., Smith, W. H, Taylor, D., Verwilligen, P., and Woods, N.

Abstract

The double-differential inclusive jet cross section is measured as a function of jet transverse momentum p[subscript T] and absolute rapidity |y|, using proton-proton collision data collected with the CMS experiment at the LHC, at a center-of-mass energy of √s = 2.76 TeV and corresponding to an integrated luminosity of 5.43 pb[superscript −1]. Jets are reconstructed within the p[subscript T] range of 74 to 592 GeV and the rapidity range |y|<3.0 . The reconstructed jet spectrum is corrected for detector resolution. The measurements are compared to the theoretical prediction at next-to-leading-order QCD using different sets of parton distribution functions. This inclusive cross section measurement explores a new kinematic region and is consistent with QCD predictions., National Science Foundation (U.S.), United States. Department of Energy

Published
2021

22. R\&D evaluation methodology based on group-AHP with uncertainty

Author

Garinei, Alberto, Piccioni, Emanuele, Proietti, Massimiliano, Marini, Andrea, Speziali, Stefano, Marconi, Marcello, Di Sante, Raffaella, Casaccia, Sara, Castellini, Paolo, Martarelli, Milena, Paone, Nicola, Revel, Gian Marco, Scalise, Lorenzo, Arnesano, Marco, Chiariotti, Paolo, Montanini, Roberto, Quattrocchi, Antonino, Silvestri, Sergio, Ficco, Giorgio, Rizzuto, Emanuele, Scorza, Andrea, Lancini, Matteo, Rossi, Gianluca, Marsili, Roberto, Zappa, Emanuele, Sciuto, Salvatore, Vacca, Gaetano, Fabbiano, Laura, Garinei, Alberto, Piccioni, Emanuele, Proietti, Massimiliano, Marini, Andrea, Speziali, Stefano, Marconi, Marcello, Di Sante, Raffaella, Casaccia, Sara, Castellini, Paolo, Martarelli, Milena, Paone, Nicola, Revel, Gian Marco, Scalise, Lorenzo, Arnesano, Marco, Chiariotti, Paolo, Montanini, Roberto, Quattrocchi, Antonino, Silvestri, Sergio, Ficco, Giorgio, Rizzuto, Emanuele, Scorza, Andrea, Lancini, Matteo, Rossi, Gianluca, Marsili, Roberto, Zappa, Emanuele, Sciuto, Salvatore, Vacca, Gaetano, and Fabbiano, Laura

Abstract

In this paper, we present an approach to evaluate Research \& Development (R\&D) performance based on the Analytic Hierarchy Process (AHP) method. Through a set of questionnaires submitted to a team of experts, we single out a set of indicators needed for R\&D performance evaluation. The indicators, together with the corresponding criteria, form the basic hierarchical structure of the AHP method. The numerical values associated with all the indicators are then used to assign a score to a given R\&D project. In order to aggregate consistently the values taken on by the different indicators, we operate on them so that they are mapped to dimensionless quantities lying in a unit interval. This is achieved by employing the empirical Cumulative Density Function (CDF) for each of the indicators. We give a thorough discussion on how to assign a score to an R\&D project along with the corresponding uncertainty due to possible inconsistencies of the decision process. A particular example of R\&D performance is finally considered., Comment: 13 pages, 2 figures

Published
2021

23. Comparing Prophet and Deep Learning to ARIMA in Forecasting Wholesale Food Prices

Author

Menculini, Lorenzo, Marini, Andrea, Proietti, Massimiliano, Garinei, Alberto, Bozza, Alessio, Moretti, Cecilia, Marconi, Marcello, Menculini, Lorenzo, Marini, Andrea, Proietti, Massimiliano, Garinei, Alberto, Bozza, Alessio, Moretti, Cecilia, and Marconi, Marcello

Abstract

Setting sale prices correctly is of great importance for firms, and the study and forecast of prices time series is therefore a relevant topic not only from a data science perspective but also from an economic and applicative one. In this paper we examine different techniques to forecast sale prices applied by an Italian food wholesaler, as a step towards the automation of pricing tasks usually taken care by human workforce. We consider ARIMA models and compare them to Prophet, a scalable forecasting tool by Facebook based on a generalized additive model, and to deep learning models exploiting Long Short--Term Memory (LSTM) and Convolutional Neural Networks (CNNs). ARIMA models are frequently used in econometric analyses, providing a good benchmark for the problem under study. Our results indicate that ARIMA models and LSTM neural networks perform similarly for the forecasting task under consideration, while the combination of CNNs and LSTMs attains the best overall accuracy, but requires more time to be tuned. On the contrary, Prophet is quick and easy to use, but considerably less accurate.t overall accuracy, but requires more time to be tuned. On the contrary, Prophet is quick and easy to use, but considerably less accurate., Comment: 17 pages, 9 figures, 10 tables. v3: improved structure and content, added figures and references

Published
2021

24. A Deep Neural Network for Simultaneous Estimation of b Jet Energy and Resolution

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Lincoln Laboratory, Abercrombie, Daniel Robert, Allen, Benjamin E., Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Youjin, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Sruthi Annapoorny, Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan Sheldon, Roland, Christof E, Roland, Gunther M, Shi, Zhenhua, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, Tianwen, Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Lincoln Laboratory, Abercrombie, Daniel Robert, Allen, Benjamin E., Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, Miao, Klute, Markus, Kovalskyi, Dmytro, Lee, Youjin, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Sruthi Annapoorny, Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan Sheldon, Roland, Christof E, Roland, Gunther M, Shi, Zhenhua, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, Tianwen, and Wyslouch, Boleslaw

Abstract

We describe a method to obtain point and dispersion estimates for the energies of jets arising from b quarks produced in proton–proton collisions at an energy of √ s = 13 TeV at the CERN LHC. The algorithm is trained on a large sample of simulated b jets and validated on data recorded by the CMS detector in 2017 corresponding to an integrated luminosity of 41 fb⁻¹. A multivariate regression algorithm based on a deep feed-forward neural network employs jet composition and shape information, and the properties of reconstructed secondary vertices associated with the jet. The results of the algorithm are used to improve the sensitivity of analyses that make use of b jets in the final state, such as the observation of Higgs boson decay to b[overline b]. .

Published
2021

25. Observation of an Excitonic Mott Transition Through Ultrafast Core-cum-Conduction Photoemission Spectroscopy

Author

Dendzik, Maciej, Xian, R. Patrick, Perfetto, Enrico, Sangalli, Davide, Kutnyakhov, Dmytro, Dong, Shuo, Beaulieu, Samuel, Pincelli, Tommaso, Pressacco, Federico, Curcio, Davide, Agustsson, Steinn Ymir, Heber, Michael, Hauer, Jasper, Wurth, Wilfried, Brenner, Guenter, Acremann, Yves, Hofmann, Philip, Wolf, Martin, Marini, Andrea, Stefanucci, Gianluca, Rettig, Laurenz, Ernstorfer, Ralph, Dendzik, Maciej, Xian, R. Patrick, Perfetto, Enrico, Sangalli, Davide, Kutnyakhov, Dmytro, Dong, Shuo, Beaulieu, Samuel, Pincelli, Tommaso, Pressacco, Federico, Curcio, Davide, Agustsson, Steinn Ymir, Heber, Michael, Hauer, Jasper, Wurth, Wilfried, Brenner, Guenter, Acremann, Yves, Hofmann, Philip, Wolf, Martin, Marini, Andrea, Stefanucci, Gianluca, Rettig, Laurenz, and Ernstorfer, Ralph

Abstract

Time-resolved soft-x-ray photoemission spectroscopy is used to simultaneously measure the ultrafast dynamics of core-level spectral functions and excited states upon excitation of excitons in WSe2. We present a many-body approximation for the Green's function, which excellently describes the transient core-hole spectral function. The relative dynamics of excited-state signal and core levels clearly show a delayed core-hole renormalization due to screening by excited quasifree carriers resulting from an excitonic Mott transition. These findings establish time-resolved core-level photoelectron spectroscopy as a sensitive probe of subtle electronic many-body interactions and ultrafast electronic phase transitions., QC 20201007

Published
2020
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26. Strongly Coupled Coherent Phonons in Single-Layer MoS2

Author

UCL - SST/IMCN - Institute of Condensed Matter and Nanosciences, UCL - SST/IMCN/MODL - Modelling, Trovatello, Chiara, Miranda, Henrique P. C., Molina-Sánchez, Alejandro, Borrego-Varillas, Rocío, Manzoni, Cristian, Moretti, Luca, Ganzer, Lucia, Maiuri, Margherita, Wang, Junjia, Dumcenco, Dumitru, Kis, Andras, Wirtz, Ludger, Marini, Andrea, Soavi, Giancarlo, Ferrari, Andrea C., Cerullo, Giulio, Sangalli, Davide, Conte, Stefano Dal, UCL - SST/IMCN - Institute of Condensed Matter and Nanosciences, UCL - SST/IMCN/MODL - Modelling, Trovatello, Chiara, Miranda, Henrique P. C., Molina-Sánchez, Alejandro, Borrego-Varillas, Rocío, Manzoni, Cristian, Moretti, Luca, Ganzer, Lucia, Maiuri, Margherita, Wang, Junjia, Dumcenco, Dumitru, Kis, Andras, Wirtz, Ludger, Marini, Andrea, Soavi, Giancarlo, Ferrari, Andrea C., Cerullo, Giulio, Sangalli, Davide, and Conte, Stefano Dal

Abstract

We present a transient absorption setup combining broadband detection over the visible–UV range with high temporal resolution (∼20 fs) which is ideally suited to trigger and detect vibrational coherences in different classes of materials. We generate and detect coherent phonons (CPs) in single-layer (1L)-MoS2, as a representative semiconducting 1L-transition metal dichalcogenide (TMD), where the confined dynamical interaction between excitons and phonons is unexplored. The coherent oscillatory motion of the out-of-plane A′1 phonons, triggered by the ultrashort laser pulses, dynamically modulates the excitonic resonances on a time scale of few tens of fs. We observe an enhancement by almost 2 orders of magnitude of the CP amplitude when detected in resonance with the C exciton peak, combined with a resonant enhancement of CP generation efficiency. Ab initio calculations of the change in the 1L-MoS2 band structure induced by the A′1 phonon displacement confirm a strong coupling with the C exciton. The resonant behavior of the CP amplitude follows the same spectral profile of the calculated Raman susceptibility tensor. These results explain the CP generation process in 1L-TMDs and demonstrate that CP excitation in 1L-MoS2 can be described as a Raman-like scattering process.

Published
2020

27. Reinterpretation of LHC Results for New Physics: Status and Recommendations after Run 2

Author

Abdallah, Waleed, AbdusSalam, Shehu, Ahmadov, Azar, Ahriche, Amine, Alguero, Gaël, Allanach, Benjamin C., Araz, Jack Y., Arbey, Alexandre, Arina, Chiara, Athron, Peter, Bagnaschi, Emanuele, Bai, Yang, Baker, Michael J., Balazs, Csaba, Barducci, Daniele, Bechtle, Philip, Bharucha, Aoife, Buckley, Andy, Butterworth, Jonathan, Cai, Haiying, Campagnari, Claudio, Cesarotti, Cari, Chrzaszcz, Marcin, Coccaro, Andrea, Conte, Eric, Cornell, Jonathan M., Corpe, Louie Dartmoor, Danninger, Matthias, Darmé, Luc, Deandrea, Aldo, Desai, Nishita, Dillon, Barry, Doglioni, Caterina, Dutta, Juhi, Ellis, John R., Ellis, Sebastian, Fassi, Farida, Feickert, Matthew, Fernandez, Nicolas, Fichet, Sylvain, Kamenik, Jernej F., Flacke, Thomas, Fuks, Benjamin, Geiser, Achim, Genest, Marie-Hélène, Ghalsasi, Akshay, Gonzalo, Tomas, Goodsell, Mark, Gori, Stefania, Gras, Philippe, Greljo, Admir, Guadagnoli, Diego, Heinemeyer, Sven, Heinrich, Lukas A., Heisig, Jan, Hong, Deog Ki, Hryn'ova, Tetiana, Huitu, Katri, Ilten, Philip, Ismail, Ahmed, Jueid, Adil, Kahlhoefer, Felix, Kalinowski, Jan, Kar, Deepak, Kats, Yevgeny, Khosa, Charanjit K., Khoze, Valeri, Klingl, Tobias, Ko, Pyungwon, Kong, Kyoungchul, Kotlarski, Wojciech, Krämer, Michael, Kraml, Sabine, Kulkarni, Suchita, Kvellestad, Anders, Lange, Clemens, Lassila-Perini, Kati, Lee, Seung J., Lessa, Andre, Liu, Zhen, Iglesias, Lara Lloret, Lorenz, Jeanette M., MacDonell, Danika, Mahmoudi, Farvah, Mamuzic, Judita, Marini, Andrea C., Markowitz, Pete, del Arbol, Pablo Martinez Ruiz, Miller, David, Mitsou, Vasiliki, Moretti, Stefano, Nardecchia, Marco, Neshatpour, Siavash, Nhung, Dao Thi, Osland, Per, Owen, Patrick H., Panella, Orlando, Pankov, Alexander, Park, Myeonghun, Porod, Werner, Price, Darren, Prosper, Harrison, Raklev, Are, Reuter, Jürgen, Reyes-González, Humberto, Rizzo, Thomas, Robens, Tania, Rojo, Juan, Rosiek, Janusz A., Ruchayskiy, Oleg, Sanz, Veronica, Schmidt-Hoberg, Kai, Scott, Pat, Sekmen, Sezen, Sengupta, Dipan, Sexton-Kennedy, Elizabeth, Shao, Hua-Sheng, Shin, Seodong, Silvestrini, Luca, Singh, Ritesh, Sinha, Sukanya, Sonneveld, Jory, Soreq, Yotam, Stark, Giordon H., Stefaniak, Tim, Thaler, Jesse, Torre, Riccardo, Torrente-Lujan, Emilio, Unel, Gokhan, Vignaroli, Natascia, Waltenberger, Wolfgang, Wardle, Nicholas, Watt, Graeme, Weiglein, Georg, White, Martin J., Williamson, Sophie L., Wittbrodt, Jonas, Wu, Lei, Wunsch, Stefan, You, Tevong, Zhang, Yang, Zurita, José, Abdallah, Waleed, AbdusSalam, Shehu, Ahmadov, Azar, Ahriche, Amine, Alguero, Gaël, Allanach, Benjamin C., Araz, Jack Y., Arbey, Alexandre, Arina, Chiara, Athron, Peter, Bagnaschi, Emanuele, Bai, Yang, Baker, Michael J., Balazs, Csaba, Barducci, Daniele, Bechtle, Philip, Bharucha, Aoife, Buckley, Andy, Butterworth, Jonathan, Cai, Haiying, Campagnari, Claudio, Cesarotti, Cari, Chrzaszcz, Marcin, Coccaro, Andrea, Conte, Eric, Cornell, Jonathan M., Corpe, Louie Dartmoor, Danninger, Matthias, Darmé, Luc, Deandrea, Aldo, Desai, Nishita, Dillon, Barry, Doglioni, Caterina, Dutta, Juhi, Ellis, John R., Ellis, Sebastian, Fassi, Farida, Feickert, Matthew, Fernandez, Nicolas, Fichet, Sylvain, Kamenik, Jernej F., Flacke, Thomas, Fuks, Benjamin, Geiser, Achim, Genest, Marie-Hélène, Ghalsasi, Akshay, Gonzalo, Tomas, Goodsell, Mark, Gori, Stefania, Gras, Philippe, Greljo, Admir, Guadagnoli, Diego, Heinemeyer, Sven, Heinrich, Lukas A., Heisig, Jan, Hong, Deog Ki, Hryn'ova, Tetiana, Huitu, Katri, Ilten, Philip, Ismail, Ahmed, Jueid, Adil, Kahlhoefer, Felix, Kalinowski, Jan, Kar, Deepak, Kats, Yevgeny, Khosa, Charanjit K., Khoze, Valeri, Klingl, Tobias, Ko, Pyungwon, Kong, Kyoungchul, Kotlarski, Wojciech, Krämer, Michael, Kraml, Sabine, Kulkarni, Suchita, Kvellestad, Anders, Lange, Clemens, Lassila-Perini, Kati, Lee, Seung J., Lessa, Andre, Liu, Zhen, Iglesias, Lara Lloret, Lorenz, Jeanette M., MacDonell, Danika, Mahmoudi, Farvah, Mamuzic, Judita, Marini, Andrea C., Markowitz, Pete, del Arbol, Pablo Martinez Ruiz, Miller, David, Mitsou, Vasiliki, Moretti, Stefano, Nardecchia, Marco, Neshatpour, Siavash, Nhung, Dao Thi, Osland, Per, Owen, Patrick H., Panella, Orlando, Pankov, Alexander, Park, Myeonghun, Porod, Werner, Price, Darren, Prosper, Harrison, Raklev, Are, Reuter, Jürgen, Reyes-González, Humberto, Rizzo, Thomas, Robens, Tania, Rojo, Juan, Rosiek, Janusz A., Ruchayskiy, Oleg, Sanz, Veronica, Schmidt-Hoberg, Kai, Scott, Pat, Sekmen, Sezen, Sengupta, Dipan, Sexton-Kennedy, Elizabeth, Shao, Hua-Sheng, Shin, Seodong, Silvestrini, Luca, Singh, Ritesh, Sinha, Sukanya, Sonneveld, Jory, Soreq, Yotam, Stark, Giordon H., Stefaniak, Tim, Thaler, Jesse, Torre, Riccardo, Torrente-Lujan, Emilio, Unel, Gokhan, Vignaroli, Natascia, Waltenberger, Wolfgang, Wardle, Nicholas, Watt, Graeme, Weiglein, Georg, White, Martin J., Williamson, Sophie L., Wittbrodt, Jonas, Wu, Lei, Wunsch, Stefan, You, Tevong, Zhang, Yang, and Zurita, José

Abstract

We report on the status of efforts to improve the reinterpretation of searches and measurements at the LHC in terms of models for new physics, in the context of the LHC Reinterpretation Forum. We detail current experimental offerings in direct searches for new particles, measurements, technical implementations and Open Data, and provide a set of recommendations for further improving the presentation of LHC results in order to better enable reinterpretation in the future. We also provide a brief description of existing software reinterpretation frameworks and recent global analyses of new physics that make use of the current data., Comment: 58 pages, minor revision following comments from SciPost referees

Published
2020
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28. Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at √ s = 8 and 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, CMS collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof, Roland, G., Stephans, George S. F., Sumorok, Konstanty C, Tatar, K., velicanu, Dragos Alexandru, Wang, J, Wang, T.W., Wyslouch, Boleslaw, Shi, Zhaozhong, Massachusetts Institute of Technology. Department of Physics, CMS collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof, Roland, G., Stephans, George S. F., Sumorok, Konstanty C, Tatar, K., velicanu, Dragos Alexandru, Wang, J, Wang, T.W., Wyslouch, Boleslaw, and Shi, Zhaozhong

Abstract

The results of a search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV decaying into two photons are presented. The analysis uses the data set collected with the CMS experiment in proton-proton collisions during the 2012 and 2016 LHC running periods. The data sample corresponds to an integrated luminosity of 19.7 (35.9)fb −1 at s=8 (13)TeV. The expected and observed 95% confidence level upper limits on the product of the cross section and branching fraction into two photons are presented. The observed upper limit for the 2012 (2016)data set ranges from 129 (161)fb to 31 (26)fb. The statistical combination of the results from the analyses of the two data sets in the common mass range between 80 and 110 GeV yields an upper limit on the product of the cross section and branching fraction, normalized to that for a standard model-like Higgs boson, ranging from 0.7 to 0.2, with two notable exceptions: one in the region around the Z boson peak, where the limit rises to 1.1, which may be due to the presence of Drell–Yan dielectron production where electrons could be misidentified as isolated photons, and a second due to an observed excess with respect to the standard model prediction, which is maximal for a mass hypothesis of 95.3 GeV with a local (global)significance of 2.8 (1.3)standard deviations.

Published
2020

29. Multiparticle correlation studies in pPb collisions at √SNN=8.16 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, CMS Collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, P., Hsu, D., Hu, M., Iiyama, Yutaro, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, X., Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, CMS Collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, P., Hsu, D., Hu, M., Iiyama, Yutaro, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, X., Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., and Wyslouch, Boleslaw

Abstract

The second- and third-order azimuthal anisotropy Fourier harmonics of charged particles produced in pPb collisions, at √SNN=8.16TeV, are studied over a wide range of event multiplicities. Multiparticle correlations are used to isolate global properties stemming from the collision overlap geometry. The second-order “elliptic” harmonic moment is obtained with high precision through four-, six-, and eight-particle correlations and, for the first time, the third-order “triangular” harmonic moment is studied using four-particle correlations. A sample of peripheral PbPb collisions at √NN=5.02TeV that covers a similar range of event multiplicities as the pPb results is also analyzed. Model calculations of initial-state fluctuations in pPb and PbPb collisions can be directly compared to the high-precision experimental results. This work provides new insight into the fluctuation-driven origin of the v[subscript 3] coefficients in pPb and PbPb collisions, and into the dominating overall collision geometry in PbPb collisions at the earliest stages of heavy ion interactions.

Published
2020

30. Search for supersymmetry in pp collisions at sqrt[s]=13 TeV with 137 fb^{-1} in final states with a single lepton using the sum of masses of large-radius jets

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Allen, B., Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Zhaozhong, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, T. W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Allen, B., Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Zhaozhong, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, T. W., and Wyslouch, Boleslaw

Abstract

Results are reported from a search for new physics beyond the standard model in proton-proton collisions in final states with a single lepton; multiple jets, including at least one jet tagged as originating from the hadronization of a bottom quark; and large missing transverse momentum. The search uses a sample of proton-proton collision data at sqrt[s]=13 TeV, corresponding to 137 fb^{-1}, recorded by the CMS experiment at the LHC. The signal region is divided into categories characterized by the total number of jets, the number of bottom quark jets, the missing transverse momentum, and the sum of masses of large-radius jets. The observed event yields in the signal regions are consistent with estimates of standard model backgrounds based on event yields in the control regions. The results are interpreted in the context of simplified models of supersymmetry involving gluino pair production in which each gluino decays into a top quark-antiquark pair and a stable, unobserved neutralino, which generates missing transverse momentum in the event. Scenarios with gluino masses up to about 2150 GeV are excluded at 95% confidence level (or more) for neutralino masses up to 700 GeV. The highest excluded neutralino mass is about 1250 GeV, which holds for gluino masses around 1850 GeV.

Published
2020

31. Search for dark matter in events with a leptoquark and missing transverse momentum in proton-proton collisions at 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, CMS Collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof, Roland, G., Stephans, George S. F., Sumorok, Konstanty C, Tatar, K., Velicanu, Dragos Alexandru, Wang, J, Wang, T.W., Wyslouch, Boleslaw, Shi, Zhaozhong, Massachusetts Institute of Technology. Department of Physics, CMS Collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof, Roland, G., Stephans, George S. F., Sumorok, Konstanty C, Tatar, K., Velicanu, Dragos Alexandru, Wang, J, Wang, T.W., Wyslouch, Boleslaw, and Shi, Zhaozhong

Abstract

A search is presented for dark matter in proton-proton collisions at a center-of-mass energy of s=13 TeV using events with at least one high transverse momentum (pT) muon, at least one high-pT jet, and large missing transverse momentum. The data were collected with the CMS detector at the CERN LHC in 2016 and 2017, and correspond to an integrated luminosity of 77.4 fb−1. In the examined scenario, a pair of scalar leptoquarks is assumed to be produced. One leptoquark decays to a muon and a jet while the other decays to dark matter and low-pT standard model particles. The signature for signal events would be significant missing transverse momentum from the dark matter in conjunction with a peak at the leptoquark mass in the invariant mass distribution of the highest pT muon and jet. The data are observed to be consistent with the background predicted by the standard model. For the first benchmark scenario considered, dark matter masses up to 500 GeV are excluded for leptoquark masses mLQ≈1400 GeV, and up to 300 GeV for mLQ≈1500 GeV. For the second benchmark scenario, dark matter masses up to 600 GeV are excluded for mLQ≈1400 GeV.

Published
2020

32. Combinations of single-top-quark production cross-section measurements and |fLVVtb| determinations at s √s = 7 and 8 TeV with the ATLAS and CMS experiments

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, ATLAS Collaboration, CMS Collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Baty, Austin Alan, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, G., Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Klute, Markus, Kovalskyi, Dmytro, Lee, Y. J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, ATLAS Collaboration, CMS Collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Baty, Austin Alan, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, G., Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Klute, Markus, Kovalskyi, Dmytro, Lee, Y. J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., and Wyslouch, Boleslaw

Abstract

This paper presents the combinations of single-top-quark production cross-section measurements by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at s = 7 and 8 TeV corresponding to integrated luminosities of 1.17 to 5.1 fb−1 at s = 7 TeV and 12.2 to 20.3 fb−1 at s = 8 TeV. These combinations are performed per centre-of-mass energy and for each production mode: t-channel, tW, and s-channel. The combined t-channel cross-sections are 67.5 ± 5.7 pb and 87.7 ± 5.8 pb at s = 7 and 8 TeV respectively. The combined tW cross-sections are 16.3 ± 4.1 pb and 23.1 ± 3.6 pb at s = 7 and 8 TeV respectively. For the s-channel cross-section, the combination yields 4.9 ± 1.4 pb at s = 8 TeV. The square of the magnitude of the CKM matrix element Vtb multiplied by a form factor fLV is determined for each production mode and centre-of-mass energy, using the ratio of the measured cross-section to its theoretical prediction. It is assumed that the top-quark-related CKM matrix elements obey the relation |Vtd|, |Vts| ≪ |Vtb|. All the |fLVVtb|2 determinations, extracted from individual ratios at s = 7 and 8 TeV, are combined, resulting in |fLVVtb| = 1.02 ± 0.04 (meas.) ± 0.02 (theo.). All combined measurements are consistent with their corresponding Standard Model predictions.[Figure not available: see fulltext.].

Published
2020

33. Search for nonresonant Higgs boson pair production in the b b ¯ b b ¯ bb‾bb‾ final state at s √s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, R., Brandt, S., Busza, Wit, Cali, I. A., D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, X., Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., Wyslouch, Boleslaw, CMS collaboration, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, R., Brandt, S., Busza, Wit, Cali, I. A., D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, X., Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, T. W., Wyslouch, Boleslaw, and CMS collaboration

Abstract

Results of a search for nonresonant production of Higgs boson pairs, with each Higgs boson decaying to a b[line over b] pair, are presented. This search uses data from proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb −1 , collected by the CMS detector at the LHC. No signal is observed, and a 95% confidence level upper limit of 847 fb is set on the cross section for standard model nonresonant Higgs boson pair production times the squared branching fraction of the Higgs boson decay to a b[line over b] pair. The same signature is studied, and upper limits are set, in the context of models of physics beyond the standard model that predict modified couplings of the Higgs boson.

Published
2020

34. Measurements of the pp → WZ inclusive and differential production cross sections and constraints on charged anomalous triple gauge couplings at s √s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, CMS Collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof, Roland, G., Stephans, George S. F., Sumorok, Konstanty C, Tatar, K., Velicanu, Dragos Alexandru, Wang, J, Wang, T.W., Wyslouch, Boleslaw, Shi, Zhaozhong, Massachusetts Institute of Technology. Department of Physics, CMS Collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof, Roland, G., Stephans, George S. F., Sumorok, Konstanty C, Tatar, K., Velicanu, Dragos Alexandru, Wang, J, Wang, T.W., Wyslouch, Boleslaw, and Shi, Zhaozhong

Abstract

The WZ production cross section is measured in proton-proton collisions at a centre-of-mass energy s = 13 TeV using data collected with the CMS detector, corresponding to an integrated luminosity of 35.9 fb -1 . The inclusive cross section is measured to be s tot (pp ? WZ) = 48.09 - 0.96+ 1.00 (stat) - 0.37+ 0.44 (theo) - 2.17+ 2.39 (syst) ± 1.39(lum) pb, resulting in a total uncertainty of -2.78/+2.98 pb. Fiducial cross section and ratios of charge-dependent cross section measurements are provided. Differential cross section measurements are also presented with respect to three variables: the Z boson transverse momentum p T , the leading jet p T , and the M(WZ) variable, defined as the invariant mass of the system composed of the three leptons and the missing transverse momentum. Differential measurements with respect to the W boson p T , separated by charge, are also shown. Results are consistent with standard model predictions, favouring next-to-next-to-leading-order predictions over those at next-to-leading order. Constraints on anomalous triple gauge couplings are derived via a binned maximum likelihood fit to the M(WZ) variable.

Published
2020

35. Search for supersymmetry in final states with photons and missing transverse momentum in proton-proton collisions at 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, CMS collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof, Roland, G., Stephans, George S. F., Sumorok, Konstanty C, Tatar, K., velicanu, Dragos Alexandru, Wang, J, Wang, T.W., Wyslouch, Boleslaw, Shi, Zhaozhong, Massachusetts Institute of Technology. Department of Physics, CMS collaboration, Abercrombie, Daniel Robert, Allen, B., Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, D., Hu, M., Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Y. -J., Levin, A., Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, S., Niu, Xinmei, Paus, Christoph M. E., Roland, Christof, Roland, G., Stephans, George S. F., Sumorok, Konstanty C, Tatar, K., velicanu, Dragos Alexandru, Wang, J, Wang, T.W., Wyslouch, Boleslaw, and Shi, Zhaozhong

Abstract

Results are reported of a search for supersymmetry in final states with photons and missing transverse momentum in proton-proton collisions at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb−1 collected at a center-of-mass energy of 13 TeV using the CMS detector. The results are interpreted in the context of models of gauge-mediated supersymmetry breaking. Production cross section limits are set on gluino and squark pair production in this framework. Gluino masses below 1.86 TeV and squark masses below 1.59 TeV are excluded at 95% confidence level.

Published
2020

36. Search for long-lived particles using nonprompt jets and missing transverse momentum with proton-proton collisions at √ s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology. Department of Mechanical Engineering, Abercrombie, Daniel Robert, Allen, B., Baty, Austin Alan, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, M., Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Shankar, Niu, X., Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jhypyng, Wang, T.W., Wyslouch, Boleslaw, Luckey, P. David, Jr., Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Massachusetts Institute of Technology. Department of Aeronautics and Astronautics, Massachusetts Institute of Technology. Department of Mechanical Engineering, Abercrombie, Daniel Robert, Allen, B., Baty, Austin Alan, Bi, R., Brandt, S., Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, David, Hu, M., Klute, Markus, Kovalskyi, Dmytro, Lee, Y.-J., Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Shankar, Niu, X., Paus, Christoph M. E., Rankin, Dylan S., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jhypyng, Wang, T.W., Wyslouch, Boleslaw, and Luckey, P. David, Jr.

Abstract

A search for long-lived particles decaying to displaced, nonprompt jets and missing transverse momentum is presented. The data sample corresponds to an integrated luminosity of 137 fb−1 of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC in 2016–2018. Candidate signal events containing nonprompt jets are identified using the timing capabilities of the CMS electromagnetic calorimeter. The results of the search are consistent with the background prediction and are interpreted using a gauge-mediated supersymmetry breaking reference model with a gluino next-to-lightest supersymmetric particle. In this model, gluino masses up to 2100, 2500, and 1900 GeV are excluded at 95% confidence level for proper decay lengths of 0.3, 1, and 100 m, respectively. These are the best limits to date for such massive gluinos with proper decay lengths greater than ∼0.5 m.

Published
2020

37. Comparing transverse momentum balance of b jet pairs in pp and PbPb collisions at sNN=5.02$$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ TeV

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Levin, Amy Elizabeth, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, CMS Collaboration, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Levin, Amy Elizabeth, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, and CMS Collaboration

Abstract

The transverse momentum balance of pairs of back-to-back b quark jets in PbPb and pp collisions recorded with the CMS detector at the LHC is reported. The center-of-mass energy in both collision systems is 5.02 TeV per nucleon pair. Compared to the pp collision baseline, b quark jets have a larger imbalance in the most central PbPb collisions, as expected from the jet quenching effect. The data are also compared to the corresponding measurement with inclusive dijets. In the most central collisions, the imbalance of b quark dijets is comparable to that of inclusive dijets. Keywords: Hadron-Hadron scattering (experiments); Heavy-ion collision; Jet physics; Quark Gluon Plasma

Published
2019

38. Study of the Underlying Event in Top Quark Pair Production in pp Collisions at 13 TeV

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, CMS Collaboration, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, and CMS Collaboration

Abstract

Measurements of normalized differential cross sections as functions of the multiplicity and kinematic variables of charged-particle tracks from the underlying event in top quark and antiquark pair production are presented. The measurements are performed in proton-proton collisions at a center-of-mass energy of 13 TeV, and are based on data collected by the CMS experiment at the LHC in 2016 corresponding to an integrated luminosity of 35.9 fb⁻¹. Events containing one electron, one muon, and two jets from the hadronization and fragmentation of b quarks are used. These measurements characterize, for the first time, properties of the underlying event in top quark pair production and show no deviation from the universality hypothesis at energy scales typically above twice the top quark mass.

Published
2019

39. Theory of hot electrons: general discussion

Author

Aizpurua, Javier, Baletto, Francesca, Baumberg, Jeremy J., Christopher, Phillip, Nijs, Bart de, Deshpande, Preeti, Diaz Fernandez, Yuri, Fabris, Laura, Freakley, Simon, Gawinkowski, Sylwester, Govorov, Alexander, Halas, Naomi J., Hernandez, Romain, Jankiewicz, Bartlomiej, Khurgin, Jacob, Kuisma, Mikael, Kumar, Priyank Vijaya, Lischner, Johannes, Liu, Jie, Marini, Andrea, Maurer, Reinhard J., Mueller, Niclas Sven, Parente, Matteo, Park, Y., Reich, Stephanie, Sivan, Yonatan, Tagliabue, Giulia, Torrente-Murciano, Laura, Thangamuthu, Madasamy, Xiao, Xiaofei, Zayats, Anatoly, Aizpurua, Javier, Baletto, Francesca, Baumberg, Jeremy J., Christopher, Phillip, Nijs, Bart de, Deshpande, Preeti, Diaz Fernandez, Yuri, Fabris, Laura, Freakley, Simon, Gawinkowski, Sylwester, Govorov, Alexander, Halas, Naomi J., Hernandez, Romain, Jankiewicz, Bartlomiej, Khurgin, Jacob, Kuisma, Mikael, Kumar, Priyank Vijaya, Lischner, Johannes, Liu, Jie, Marini, Andrea, Maurer, Reinhard J., Mueller, Niclas Sven, Parente, Matteo, Park, Y., Reich, Stephanie, Sivan, Yonatan, Tagliabue, Giulia, Torrente-Murciano, Laura, Thangamuthu, Madasamy, Xiao, Xiaofei, and Zayats, Anatoly

Published
2019

40. New materials for hot electron generation: general discussion

Author

Aizpurua, Javier, Baumberg, Jeremy J., Boltasseva, Alexandra, Christopher, Phillip, Cortes, Emiliano, Cronin, Stephen B., Dadhich, Bhavesh Kumar, Nijs, Bart de, Deshpande, Preeti, Diaz Fernandez, Yuri, Fabris, Laura, Gawinkowski, Sylwester, Govorov, Alexander, Halas, Naomi J., Huang, Junyang, Jankiewicz, Bartlomiej, Kamarudheen, Rifat, Khurgin, Jacob, Lee, Tae Kyung, Mahin, Julien, Marini, Andrea, Maurer, Reinhard J., Mueller, Niclas Sven, Park, Y., Rahaman, Mahfuju, Sühlücker, Sebastian, Schultz, Zachary, Sivan, Yonatan, Romero Gomez, Rosa Mayela, Salmon-Gamboa, Jorge, Schlücker, Sebastian, Tagliabue, Giulia, Thangamuthu, Madasamy, Xu, Hongxing, Zayats, Anatoly, Aizpurua, Javier, Baumberg, Jeremy J., Boltasseva, Alexandra, Christopher, Phillip, Cortes, Emiliano, Cronin, Stephen B., Dadhich, Bhavesh Kumar, Nijs, Bart de, Deshpande, Preeti, Diaz Fernandez, Yuri, Fabris, Laura, Gawinkowski, Sylwester, Govorov, Alexander, Halas, Naomi J., Huang, Junyang, Jankiewicz, Bartlomiej, Kamarudheen, Rifat, Khurgin, Jacob, Lee, Tae Kyung, Mahin, Julien, Marini, Andrea, Maurer, Reinhard J., Mueller, Niclas Sven, Park, Y., Rahaman, Mahfuju, Sühlücker, Sebastian, Schultz, Zachary, Sivan, Yonatan, Romero Gomez, Rosa Mayela, Salmon-Gamboa, Jorge, Schlücker, Sebastian, Tagliabue, Giulia, Thangamuthu, Madasamy, Xu, Hongxing, and Zayats, Anatoly

Published
2019

41. Search for long-lived particles decaying into displaced jets in proton-proton collisions at √s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Youjin, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Sruthi A., Niu, Xinmei, Paus, Christoph M. E., Terry, David Rankin, Roland, Christof E, Roland, Gunther M, Shi, Zhaozhong, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jianchun, Wang, Tianwen, Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Youjin, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Sruthi A., Niu, Xinmei, Paus, Christoph M. E., Terry, David Rankin, Roland, Christof E, Roland, Gunther M, Shi, Zhaozhong, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jianchun, Wang, Tianwen, and Wyslouch, Boleslaw

Abstract

A search for long-lived particles decaying into jets is presented. Data were collected with the CMS detector at the LHC from proton-proton collisions at a center-of-mass energy of 13 TeV in 2016, corresponding to an integrated luminosity of 35.9 fb⁻¹. The search examines the distinctive topology of displaced tracks and secondary vertices. The selected events are found to be consistent with standard model predictions. For a simplified model in which long-lived neutral particles are pair produced and decay to two jets, pair production cross sections larger than 0.2 fb are excluded at 95% confidence level for a long-lived particle mass larger than 1000 GeV and proper decay lengths between 3 and 130 mm. Several supersymmetry models with gauge-mediated supersymmetry breaking or R-parity violation, where pair-produced long-lived gluinos or top squarks decay to several final-state topologies containing displaced jets, are also tested. For these models, in the mass ranges above 200 GeV, gluino masses up to 2300–2400 GeV and top squark masses up to 1350–1600 GeV are excluded for proper decay lengths approximately between 10 and 100 mm. These are the most restrictive limits to date on these models.

Published
2019

42. Measurement of Differential Cross Sections for Z Boson Production in Association with Jets in Proton-Proton Collisions at √s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Levin, Amy Elizabeth, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, CMS Collaboration, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Levin, Amy Elizabeth, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, and CMS Collaboration

Abstract

The production of a Z boson, decaying to two charged leptons, in association with jets in proton-proton collisions at a centre-of-mass energy of 13 TeV is measured. Data recorded with the CMS detector at the LHC are used that correspond to an integrated luminosity of 2.19fb⁻¹. The cross section is measured as a function of the jet multiplicity and its dependence on the transverse momentum of the Z boson, the jet kinematic variables (transverse momentum and rapidity), the scalar sum of the jet momenta, which quantifies the hadronic activity, and the balance in transverse momentum between the reconstructed jet recoil and the Z boson. The measurements are compared with predictions from four different calculations. The first two merge matrix elements with different parton multiplicities in the final state and parton showering, one of which includes one-loop corrections. The third is a fixed-order calculation with next-to-next-to-leading order accuracy for the process with a Z boson and one parton in the final state. The fourth combines the fully differential next-to-next-to-leading order calculation of the process with no parton in the final state with next-to-next-to-leading logarithm resummation and parton showering. Keywords: CMS; Physics; Standard model; Cross section; Z boson; Jets; Proton; LHC

Published
2019

43. Event Shape Variables Measured Using Multijet Final States in Proton-Proton Collisions at √s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, CMS Collaboration, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, and CMS Collaboration

Abstract

The study of global event shape variables can provide sensitive tests of predictions for multijet production in proton-proton collisions. This paper presents a study of several event shape variables calculated using jet four momenta in proton-proton collisions at a centre-of-mass energy of 13 TeV and uses data recorded with the CMS detector at the LHC corresponding to an integrated luminosity of 2.2 fb⁻¹. After correcting for detector effects, the resulting distributions are compared with several theoretical predictions. The agreement generally improves as the energy, represented by the average transverse momentum of the two leading jets, increases. Keywords: Hadron-Hadron scattering (experiments); Jet physics; Jets

Published
2019

44. Measurement of the transverse momentum spectrum of the Higgs boson produced in pp collisions at √s=8 TeV using H → WW decays

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Allen, Brandon Leigh, Apyan, Aram, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Bierwagen, Katharina, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, Demiragli, Zeynep, Di Matteo, Leonardo, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hsu, Dylan George, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Krajczar, Krisztian F., Lai, Yue Shi, Lee, Yen-Jie, Levin, Andrew Michael, Luckey Jr, P David, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Varma, Mukund Madhav, Velicanu, Dragos Alexandru, Veverka, Jan, Wang, J., Wang, Ta-Wei, Wyslouch, Boleslaw, Yang, Mingming, Wyslouch, Victoria, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Allen, Brandon Leigh, Apyan, Aram, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Bierwagen, Katharina, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, Demiragli, Zeynep, Di Matteo, Leonardo, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hsu, Dylan George, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Krajczar, Krisztian F., Lai, Yue Shi, Lee, Yen-Jie, Levin, Andrew Michael, Luckey Jr, P David, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Varma, Mukund Madhav, Velicanu, Dragos Alexandru, Veverka, Jan, Wang, J., Wang, Ta-Wei, Wyslouch, Boleslaw, Yang, Mingming, and Wyslouch, Victoria

Abstract

The cross section for Higgs boson production in pp collisions is studied using the H → W[superscript +]W[superscript −] decay mode, followed by leptonic decays of the W bosons to an oppositely charged electron-muon pair in the final state. The measurements are performed using data collected by the CMS experiment at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.4 fb[superscript −1]. The Higgs boson transverse momentum (p[subscript T]) is reconstructed using the lepton pair p[subscript T] and missing p[subscript T]. The differential cross section times branching fraction is measured as a function of the Higgs boson pTin a fiducial phase space defined to match the experimental acceptance in terms of the lepton kinematics and event topology. The production cross section times branching fraction in the fiducial phase space is measured to be 39 ± 8 (stat) ± 9 (syst) fb. The measurements are found to agree, within experimental uncertainties, with theoretical calculations based on the standard model. Keywords: Hadron-Hadron scattering (experiments), Higgs physics, National Science Foundation (U.S.), United States. Department of Energy

Published
2019

45. Search for Low-Mass Resonances Decaying into Bottom Quark-Antiquark Pairs in Proton-Proton Collisions at √S=13 TeV

Author

Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, Ta-Wei, Wyslouch, Boleslaw, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Shi, Z., Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, J., Wang, Ta-Wei, and Wyslouch, Boleslaw

Abstract

A search for narrow, low-mass, scalar, and pseudoscalar resonances decaying to bottom quark-antiquark pairs is presented. The search is based on events recorded in √s = 13 TeV proton-proton collisions with the CMS detector at the LHC, collected in 2016, and corresponding to an integrated luminosity of 35.9 fb[superscript −1]. The search selects events in which the resonance would be produced with high transverse momentum because of the presence of initial- or final-state radiation. In such events, the decay products of the resonance would be reconstructed as a single large-radius jet with high mass and two-prong substructure. A potential signal would be identified as a narrow excess in the jet invariant mass spectrum. No evidence for such a resonance is observed within the mass range from 50 to 350 GeV, and upper limits at 95% confidence level are set on the product of the cross section and branching fraction to a bottom quarkantiquark pair. These constitute the first constraints from the LHC on exotic bottom quark-antiquark resonances with masses below 325 GeV., United States. Department of Energy, National Science Foundation (U.S.)

Published
2019

46. Search for Single Production of Vector-Like Quarks Decaying to a Top Quark and a W Boson in proton–proton Collisions at √s = 13 TeV

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, CMS Collaboration, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, and CMS Collaboration

Abstract

A search is presented for the single production of vector-like quarks in proton–proton collisions at √s = 13 TeV. The data, corresponding to an integrated luminosity of 35.9fb⁻¹, were recorded with the CMS experiment at the LHC. The analysis focuses on the vector-like quark decay into a top quark and a W boson, with one muon or electron in the final state. The mass of the vector-like quark candidate is reconstructed from hadronic jets, the lepton, and the missing transverse momentum. Methods for the identification of b quarks and of highly Lorentz boosted hadronically decaying top quarks and W bosons are exploited in this search. No significant deviation from the standard model background expectation is observed. Exclusion limits at 95% confidence level are set on the product of the production cross section and branching fraction as a function of the vector-like quark mass, which range from 0.3 to 0.03pb for vector-like quark masses of 700 to 2000GeV. Mass exclusion limits up to 1660GeV are obtained, depending on the vector-like quark type, coupling, and decay width. These represent the most stringent exclusion limits for the single production of vector-like quarks in this channel.

Published
2019

47. Search for new long-lived particles at √s = 13 TeV

Author

Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hsu, Dylan George, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Yue Shi, Lee, Yen-Jie, Levin, Amy Elizabeth, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, CMS Collaboration, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hsu, Dylan George, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Yue Shi, Lee, Yen-Jie, Levin, Amy Elizabeth, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, and CMS Collaboration

Abstract

A search for long-lived particles was performed with data corresponding to an integrated luminosity of 2.6 fb⁻¹ collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2015. The analysis exploits two customized topological trigger algorithms, and uses the multiplicity of displaced jets to search for the presence of a signal decay occurring at distances between 1 and 1000 mm. The results can be interpreted in a variety of different models. For pair-produced long-lived particles decaying to two b quarks and two leptons with equal decay rates between lepton flavors, cross sections larger than 2.5 fb are excluded for proper decay lengths between 70–100 mm for a long-lived particle mass of 1130 GeV at 95% confidence. For a specific model of pair-produced, long-lived top squarks with R-parity violating decays to a b quark and a lepton, masses below 550–1130 GeV are excluded at 95% confidence for equal branching fractions between lepton flavors, depending on the squark decay length. This mass bound is the most stringent to date for top squark proper decay lengths greater than 3 mm. Keywords: CMS; Physics; Long-lived particles

Published
2019

48. Search for heavy resonances that decay into a vector boson and a Higgs boson in hadronic final states at $$\sqrt{s} = 13$$ s = 13 $$\,\text {TeV}$$ TeV

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hsu, Dylan George, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Yue Shi, Lee, Yen-Jie, Levin, Amy Elizabeth, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, CMS Collaboration, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hsu, Dylan George, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lai, Yue Shi, Lee, Yen-Jie, Levin, Amy Elizabeth, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, and CMS Collaboration

Abstract

A search for heavy resonances with masses above 1 TeV, decaying to final states containing a vector boson and a Higgs boson, is presented. The search considers hadronic decays of the vector boson, and Higgs boson decays to b quarks. The decay products are highly boosted, and each collimated pair of quarks is reconstructed as a single, massive jet. The analysis is performed using a data sample collected in 2016 by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9fb⁻¹. The data are consistent with the background expectation and are used to place limits on the parameters of a theoretical model with a heavy vector triplet. In the benchmark scenario with mass-degenerate W′ and Z′ bosons decaying predominantly to pairs of standard model bosons, for the first time heavy resonances for masses as high as 3.3 TeV are excluded at 95% confidence level, setting the most stringent constraints to date on such states decaying into a vector boson and a Higgs boson.

Published
2019

49. Search for Heavy Resonances Decaying into a Vector Boson and a Higgs Boson in Final States with Charged Leptons, Neutrinos and b Quarks at √s =13 TeV

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, CMS Collaboration, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Abercrombie, Daniel Robert, Allen, Brandon Leigh, Azzolini, Virginia, Baty, Austin Alan, Bauer, Gerry P, Bi, Ran, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, D'Alfonso, Mariarosaria, Demiragli, Zeynep, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Harris, Philip Coleman, Hsu, Dylan George, Hu, Miao, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Lee, Yen-Jie, Luckey Jr, P David, Maier, Benedikt, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Velicanu, Dragos Alexandru, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Shi, Zhaozhong, and CMS Collaboration

Abstract

A search for heavy resonances, decaying into the standard model vector bosons and the standard model Higgs boson, is presented. The final states considered contain a b quark-antiquark pair from the decay of the Higgs boson, along with electrons and muons and missing transverse momentum, due to undetected neutrinos, from the decay of the vector bosons. The mass spectra are used to search for a localized excess consistent with a resonant particle. The data sample corresponds to an integrated luminosity of 35.9 fb⁻¹ collected in 2016 by the CMS experiment at the CERN LHC from proton-proton collisions at a center-of-mass energy of 13 TeV. The data are found to be consistent with background expectations. Exclusion limits are set in the context of spin-0 two Higgs doublet models, some of which include the presence of dark matter. In the spin-1 heavy vector triplet framework, mass-degenerate W′ and Z′ resonances with dominant couplings to the standard model gauge bosons are excluded below a mass of 2.9 TeV at 95% confidence level. Keywords: Beyond Standard Model; Hadron-Hadron scattering (experiments); Higgs physics

Published
2019

50. Measurements of the Associated Production of a Z Boson and b Jets in pp Collisions at √s = 8 TeV

Author

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Apyan, Aram, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Bierwagen, Katharina, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, Demiragli, Zeynep, Di Matteo, Leonardo, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Hsu, Dylan George, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Krajczar, Krisztian F., Lai, Yue Shi, Lee, Yen-Jie, Levin, Amy Elizabeth, Luckey Jr, P David, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Varma, Mukund Madhav, Velicanu, Dragos Alexandru, Veverka, Jan, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Yang, Ming, Wyslouch, Victoria, CMS Collaboration, Massachusetts Institute of Technology. Department of Nuclear Science and Engineering, Massachusetts Institute of Technology. Department of Physics, Massachusetts Institute of Technology. Laboratory for Nuclear Science, Apyan, Aram, Barbieri, Richard Alexander, Baty, Austin Alan, Bi, Ran, Bierwagen, Katharina, Brandt, Stephanie Akemi, Busza, Wit, Cali, Ivan Amos, Demiragli, Zeynep, Di Matteo, Leonardo, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Hsu, Dylan George, Iiyama, Yutaro, Innocenti, Gian Michele, Klute, Markus, Kovalskyi, Dmytro, Krajczar, Krisztian F., Lai, Yue Shi, Lee, Yen-Jie, Levin, Amy Elizabeth, Luckey Jr, P David, Marini, Andrea Carlo, McGinn, Christopher Francis, Mironov, Camelia Maria, Narayanan, Siddharth Madhavan, Niu, Xinmei, Paus, Christoph M. E., Roland, Christof E, Roland, Gunther M, Salfeld-Nebgen, Jakob Maxillian Henry, Stephans, George S. F., Sumorok, Konstanty C, Tatar, Kaya, Varma, Mukund Madhav, Velicanu, Dragos Alexandru, Veverka, Jan, Wang, Jing, Wang, Ta-Wei, Wyslouch, Boleslaw, Yang, Ming, Wyslouch, Victoria, and CMS Collaboration

Abstract

Measurements of the associated production of a Z boson with at least one jet originating from a b quark in proton–proton collisions at s=8TeV are presented. Differential cross sections are measured with data collected by the CMS experiment corresponding to an integrated luminosity of 19.8fb-1. Z bosons are reconstructed through their decays to electrons and muons. Cross sections are measured as a function of observables characterizing the kinematics of the b jet and the Z boson. Ratios of differential cross sections for the associated production with at least one b jet to the associated production with any jet are also presented. The production of a Z boson with at least two b jets is investigated, and differential cross sections are measured for the dijet system. Results are compared to theoretical predictions, testing two different flavour schemes for the choice of initial-state partons.

Published
2019

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